Bump version for v2.1.0 release

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
Update ChangeLog for v2.1.0 release
2026-10-23 11:24:34 +00:00 · 2017-11-14 13:47:22 +01:00 · 2017-11-14 13:47:00 +01:00 · 2017-11-14 13:39:02 +01:00 · 2017-11-14 13:31:47 +01:00 · 2017-11-14 13:14:21 +01:00
55 changed files with 1723 additions and 707 deletions
@@ -1,7 +1,36 @@
-bench
-test
+*~
 *.d
 *.o
-*~
-libuev.a
-libuev.so.1
+*.so
+*.so.*
+*.a
+*.la
+*.lo
+*.html
+.config
+.deps
+.libs
+.unpacked
+ID
+GTAGS
+GRTAGS
+GPATH
+compile
+config.*
+configure
+depcomp
+install-sh
+libtool
+ltmain.sh
+missing
+stamp-h1
+Makefile
+Makefile.in
+aclocal.m4
+ar-lib
+autom4te.cache
+bench
+libuev*.tar.*
+libuev.pc
+!libuev.pc.in
+test-driver
@@ -2,9 +2,14 @@
 # Defaults to GNU GCC and autotools: ./configure && make && make test
 language: c

-# We don't need to install packages, use dockerized build, quicker
+# Use docker for quicker builds, it now allows https://docs.travis-ci.com/user/apt/
 sudo: false

+# Test build with both GCC and Clang (LLVM)
+compiler:
+  - gcc
+  - clang
+
 env:
  global:
   # The next declaration is the encrypted COVERITY_SCAN_TOKEN, created
@@ -17,11 +22,13 @@ addons:
      name: "troglobit/libuev"
      description: "libuEv | Simple event loop for Linux"
    notification_email: troglobit@gmail.com
-    build_command: "make"
+    build_command_prepend: "./autogen.sh && ./configure --enable-examples"
+    build_command: "make clean all"
    branch_pattern: dev

-# We don't use configure, so we must define our own build script.
 script:
-  - make distclean
+  - ./autogen.sh
+  - ./configure --disable-silent-rules --enable-examples
+  - make clean
  - make -j5
-  - make test
+  - make check
@@ -0,0 +1,354 @@
+API Documentation
+=================
+
+* [Introduction](#introduction)
+* [Overview](#overview)
+  * [Create an Event Context](#create-an-event-context)
+  * [Register an Event Watcher](#register-an-event-watcher)
+  * [Start Event Loop](#start-event-loop)
+  * [Summary](#summary)
+* [Using -luev](#using--luev)
+* [Joystick Example](#joystick-example)
+
+
+> “Event driven software improves concurrency” -- [Dave Zarzycki, Apple][]
+
+Introduction
+------------
+
+The C API to [libuEv][], listed in `uev/uev.h`, handles three different
+types of events: I/O (pipes, sockets, message queues, etc.), timers, and
+signals.  The [Summary](#summary) details a slight caveat on signals.
+
+Notice the *lack of support for regular files* and directories.  This is
+a limitation of the underlying Linux `epoll` interface which will return
+`EPERM` for regular files.  Except for the special case when `stdin` is
+redirected from the command line.  See `examples/redirect.c` for more on
+this particular case.
+
+Timers can be either relative, timeout in milliseconds, or absolute with
+a time given in `time_t`, see `mktime()` et al.  Absolute timers are
+called cron timers and their callbacks get an `UEV_HUP` error event if
+the wall clock changes, either via NTP or user input.
+
+**NOTE:** On some systems, embedded in particular, `time_t` is a 32-bit
+  integer that wraps around in the year 2038.  A [GLIBC workaround][]
+  (`-D_TIME_BITS=64`) protects those systems, but users of other C
+  libraries have no known workarounds.  It is strongly recommended to
+  use relative timers as often as possible.
+
+
+Overview
+--------
+
+```C
+/*
+ * Callback example, arg comes from the watcher's *_init() function,
+ * w->fd holds the file descriptor or socket, and events is set by
+ * libuEv to indicate status: UEV_READ and/or UEV_WRITE with any of
+ * the optional UEV_HUP, UEV_RDHUP, or UEV_PRI for urgent read data.
+ *
+ * Note: UEV_ERROR may be returned for any watcher and must be checked
+ *       by all callbacks.  I/O watchers may also need to check UEV_HUP.
+ *       Appropriate action, e.g. restart the watcher, is up to the
+ *       application and is thus delegated to the callback.
+ */
+void callback       (uev_t *w, void *arg, int events);
+
+/* Event loop:      Notice the use of flags! */
+int uev_init        (uev_ctx_t *ctx);
+int uev_exit        (uev_ctx_t *ctx);
+int uev_run         (uev_ctx_t *ctx, int flags);         /* UEV_NONE, UEV_ONCE, and/or UEV_NONBLOCK */
+
+/* I/O watcher:     fd      *MUST* be non-blocking!
+ *                  events  combination of the main flags:  UEV_READ, UEV_WRITE,
+ *                                                          UEV_EDGE, UEV_ONESHOT
+ */
+int uev_io_init     (uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, int fd, int events);
+int uev_io_set      (uev_t *w, int fd, int events);
+int uev_io_start    (uev_t *w);
+int uev_io_stop     (uev_t *w);
+
+/* Timer watcher:   schedule a relative timer, timeout and period in milliseconds */
+int uev_timer_init  (uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, int timeout, int period);
+int uev_timer_set   (uev_t *w, int timeout, int period); /* Change timeout or period */
+int uev_timer_start (uev_t *w);                          /* Restart a stopped timer */
+int uev_timer_stop  (uev_t *w);                          /* Stop a timer */
+
+/* Cron watcher:    schedule an absolute timer, when and period in time_t seconds */
+int uev_cron_init   (uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, time_t when, time_t period);
+int uev_cron_set    (uev_t *w, int when, time_t period); /* Change when or period */
+int uev_cron_start  (uev_t *w);                          /* Restart a stopped cron */
+int uev_cron_stop   (uev_t *w);                          /* Stop a cron */
+
+/* Signal watcher:  signo is the signal to wait for, e.g., SIGTERM */
+int uev_signal_init (uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, int signo);
+int uev_signal_set  (uev_t *w, int signo);               /* Change signal to wait for */
+int uev_signal_start(uev_t *w);                          /* Restart a stopped signal watcher */
+int uev_signal_stop (uev_t *w);                          /* Stop signal watcher */
+```
+
+
+### Create an Event Context
+
+To monitor events the developer first creates an *event context*, this
+is achieved by calling `uev_init()` with a pointer to a (thread) local
+`uev_ctx_t` variable.
+
+```C
+uev_ctx_t ctx;
+
+uev_init(&ctx);
+```
+
+
+### Register an Event Watcher
+
+For each event to monitor, be it a signal, cron/timer or a file/network
+descriptor, a *watcher* must be registered with the event context.  The
+watcher, an `uev_t`, is registered by calling the event type's `_init()`
+function with the `uev_ctx_t` context, the callback, and an optional
+argument.
+
+Here is a signal example:
+
+```C
+void cleanup_exit(uev_t *w, void *arg, int events)
+{
+    if (UEV_ERROR == events)
+	    puts("Ignoring signal watcher error ...");
+
+    /* Graceful exit, with optional cleanup ... */
+    uev_exit(w->ctx);
+}
+
+int main(void)
+{
+    uev_t sigterm_watcher;
+
+    .
+    .
+    uev_signal_init(&ctx, &sigterm_watcher, cleanup_exit, NULL, SIGTERM);
+    .
+    .
+}
+```
+
+Notice that the callback must be prepared to handle `UEV_ERROR`.  I/O
+watchers in particular, but also timer watchers, must be restarted if
+required by the application.  libuEv automatically tries to restart a
+signal watcher, but should that fail the callback will return error as
+well.
+
+I/O watchers should also check for `UEV_HUP`, preferably when handling
+any short `read()` or `write()` system calls.  A short read on a socket
+may be due to the remote end having performed a `shutdown()`.  This is
+signaled to the callback using `UEV_HUP` in the `events` mask.
+
+
+### Start Event Loop
+
+When all watchers are registered, call the *event loop* with `uev_run()`
+and the argument to the event context.  The `flags` parameter can be
+used to integrate [libuEv][] into another event loop.
+
+In this example we set `flags` to none:
+
+```C
+result = uev_run(&ctx, UEV_NONE);
+```
+
+With `flags` set to `UEV_ONCE` the event loop returns as soon as it has
+served the first event.  If `flags` is set to `UEV_ONCE | UEV_NONBLOCK`
+the event loop returns immediately if no event is available.
+
+```
+if (result < 0)
+    errx(result, "Unrecoverable event loop error, error %d", result);
+```
+
+If the call to `uev_run()` fails you should notify the user somehow.
+libuEv fails if there is an invalid pointer, if `uev_init()` was not
+called, or recurring `epoll()` errors thare are impossible to recover
+from should occur.  This is true for individual watchers as well, in
+particular signal and timer watchers which can fail in miserable ways.
+
+**Note:** libuEv handles many types of errors, stream close, or peer
+shutdowns internally, but also lets the callback run.  This is useful
+for stateful connections to be able to detect EOF.
+
+### Summary
+
+1. Set up an event context with `uev_init()`
+2. Register event callbacks with the event context using
+   `uev_io_init()`, `uev_signal_init()` or `uev_timer_init()`
+3. Make sure callbacks checks their `events` mask and handles:
+
+   - `UEV_ERROR`, e.g. I/O watchers must be restarted
+   - `UEV_HUP`, reading any remaining data on the descriptor
+
+   In both of these cases the watcher is stopped by libuEv.  On HUP the
+   descriptor/connection must be reopened and the watcher reinitialized
+   with `uev_io_set()`, if required by the application.
+4. Start the event loop with `uev_run()`
+5. Exit the event loop with `uev_exit()`, possibly from a callback
+
+**Note 1:** Make sure to use non-blocking stream I/O!  Most hard to find
+  bugs in event driven applications are due to sockets and files being
+  opened in blocking mode.  Be careful out there!
+
+**Note 2:** When closing a descriptor or socket, make sure to first stop
+  your watcher, if possible.  This will help prevent any nasty side
+  effects on your program.
+
+**Note 3:** a certain amount of care is needed when dealing with APIs
+  that employ signalfd.  If your application use `system()` you replace
+  that with `fork()`, and then in the child, unblock all signals blocked
+  by your parent process, before you run `exec()`.  This because Linux
+  does not unblock signals for your children, and neither does most
+  (all?)  C-libraries.  See the [finit][6] project's implementation of
+  `run()` for an example of this.  For more details on this issue, see
+  [this article][4] at [lwn.net](http://lwn.net).
+
+
+Using -luev
+-----------
+
+libuEv is by default installed as a library with a few header files, you
+should only ever need to include one:
+
+```C
+#include <uev/uev.h>
+```
+
+The output from the `pkg-config` tool holds no surprises:
+
+```sh
+$ pkg-config --libs --static --cflags libuev
+-I/usr/local/include -L/usr/local/lib -luev
+```
+
+The prefix path `/usr/local/` shown here is only the default.  Use the
+`configure` script to select a different prefix when installing libuEv.
+
+For GNU autotools based projects, use the following in `configure.ac`:
+
+```sh
+# Check for required libraries
+PKG_CHECK_MODULES([uev], [libuev >= 1.4.0])
+```
+
+and in your `Makefile.am`:
+
+```sh
+proggy_CFLAGS = $(uev_CFLAGS)
+proggy_LDADD  = $(uev_LIBS)
+```
+
+
+Joystick Example
+----------------
+
+Here follows a very brief example to illustrate how one can use libuEv
+to act upon joystick input.
+
+```C
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <uev/uev.h>
+
+struct js_event {
+    uint32_t time;      /* event timestamp in milliseconds */
+    int16_t  value;     /* value */
+    uint8_t  type;      /* event type */
+    uint8_t  number;    /* axis/button number */
+} e;
+
+/*
+ * Called on any joystick event
+ *
+ * Note: We handle errors here by exiting, for a background daemon with
+ *       multiple watchers you may want another approach.
+ */
+static void joystick_cb(uev_t *w, void *arg, int events)
+{
+    ssize_t cnt;
+
+    if (UEV_ERROR == events) {
+        /* Possibly joystick was unplugged */
+        warnx("Spurious problem with the joystick watcher, restarting.");
+        uev_io_start(w);
+    }
+
+    cnt = read(w->fd, &e, sizeof(e));
+    if (cnt < 0) {
+        warn("Failed reading joystick event");
+        return;
+    }
+
+    if (cnt == 0 || UEV_HUP == events) {
+        warn("Joystick disconnected");
+        return;
+    }
+
+    switch (e.type) {
+    case 1:
+        printf("Button %d %s\n", e.number, e.value ? "pressed" : "released");
+        break;
+
+    case 2:
+        printf("Joystick axis %d moved, value %d!\n", e.number, e.value);
+        break;
+    }
+}
+
+int main(void)
+{
+    int fd;
+    uev_t watcher;
+    uev_ctx_t ctx;
+
+    fd = open("/dev/input/js1", O_RDONLY, O_NONBLOCK);
+    if (fd < 0)
+        errx(errno, "Cannot find a joystick attached.");
+
+    uev_init(&ctx);
+    uev_io_init(&ctx, &watcher, joystick_cb, NULL, fd, UEV_READ);
+
+    puts("Starting, press Ctrl-C to exit.");
+
+    return uev_run(&ctx, 0);
+}
+```
+
+To build the example, follow installation instructions below, then save
+the code as `joystick.c` and call GCC
+
+```sh
+$ gcc `pkg-config --libs --static --cflags libuev` -o joystick joystick.c
+```
+
+Alternatively, call the `Makefile` with <kbd>make joystick</kbd> from
+the unpacked [libuEv][] distribution.
+
+More complete and relevant example uses of [libuEv][] is the FTP/TFTP
+server [uftpd][5], and the Linux `/sbin/init` replacement [finit][6].
+Both successfully employ [libuEv][].
+
+Also see the `bench.c` program (<kbd>make bench</kbd> from within the
+library) for [reference benchmarks][7] against [libevent][1] and
+[libev][2].
+
+[1]:      http://libevent.org
+[2]:      http://software.schmorp.de/pkg/libev.html
+[4]:      http://lwn.net/Articles/415684/
+[5]:      https://github.com/troglobit/uftpd
+[6]:      https://github.com/troglobit/finit
+[7]:      http://libev.schmorp.de/bench.html
+[libuEv]: https://github.com/troglobit/libuev
+[GLIBC workaround]: https://sourceware.org/glibc/wiki/Y2038ProofnessDesign
+[Dave Zarzycki, Apple]: http://www.youtube.com/watch?v=cD_s6Fjdri8
@@ -1 +0,0 @@
-ChangeLog.md
@@ -3,8 +3,152 @@ Change Log

 All notable changes to the project are documented in this file.

-[v1.2.4] - 2015-11-23
---------------------
+
+[v2.1.0][] - 2017-11-14
+-----------------------
+
+### Changes
+- Remove event loop error tracking used to trigger a `epoll_create1()`
+  at a certain error threshold.  This tracking was first introduced in
+  [v1.1.0][], triggered by spurious `EPOLLERR` on I/O watchers
+- Unconditionally stop I/O watchers that return `EPOLLERR` or `EPOLLHUP`
+  it is up to the watcher callback to clear the error and/or `read()`
+  the last few bytes from the descriptor.  HUP usally means EOF, or that
+  the remote end of a stream or pipe closed, this may also be signaled
+  by `read()` returning zero
+- Add missing `--enable-examples` to `configure` script
+- Update documentation, both [README.md][] and [API.md][]
+
+### Fixes
+- Properly stop and de-register signal and cron/timer watchers from the
+  epoll socket in case of errors, problem introduced in [v2.0.0][]
+- Mark watcher file descriptor as unintialized on internal error
+- Fix double-close of cron/timer watchers.  Problem triggered when the
+  timer expires and calls `uev_exit()`, which stops all watchers.  When
+  the timer callback returns another call to stop the watcher triggered
+  the double `close()`
+- Fix unit test's error handling in watcher callbacks, for reference
+- Fix use-before-set in cronrun unit test
+- Make sure to restart unit test's I/O watchers on `UEV_ERROR`
+- Make sure to restart example I/O watchers on `UEV_ERROR`
+- Properly check for `UEV_HUP` in unit tests and examples
+
+
+[v2.0.0][] - 2017-11-11
+-----------------------
+
+Beware, this is a major release, introducing incompatible changes to the
+failure modes of `uev_run()` and watcher callbacks.  Most users will most
+likely not notice any difference, but please read on.
+
+### Changes
+- `uev_run()` no longer exits the main event loop if an unrecoverable
+  error with a watcher occurs.  Instead, the watcher is disabled and the
+  callback is run one last time with `events` set to `UEV_ERROR`
+- Watcher callbacks must handle `UEV_ERROR` conditions.  This pertains
+  in particular to signal and timer watchers
+- Examples and API docs updated with the new failure modes
+
+
+[v1.6.0][] - 2017-09-18
+-----------------------
+
+### Changes
+- Support for edge triggered and oneshot event types
+- Add `make package` build target to trigger a `.deb` package build
+- Support 64 bit `time_t` on 32 bit GLIBC systems
+
+### Fixes
+- `bench.c`: Use `signal.h`, not non-standard `sys/signal.h`
+
+
+[v1.5.2][] - 2016-11-27
+-----------------------
+
+### Fixes
+- Fix build regression in v1.5.1
+
+
+[v1.5.1][] - 2016-11-27
+-----------------------
+
+### Changes
+- Add support for checking if a watcher is active.
+- Refactor unit testing framework
+
+
+[v1.5.0][] - 2016-10-30
+-----------------------
+
+### Changes
+- Add support for absolute timers with the `uev_cron_*()` API.
+- Update build & install instructions in [README.md][]
+
+### Fixes
+- Fix `uev_timer_set()` so that it returns error in case the underlying
+  Linux timerfd API fails.
+
+
+[v1.4.2][] - 2016-06-25
+-----------------------
+
+### Changes
+- Add range checks for `period` and `timeout` to `uev_timer_init()` and
+  `uev_timer_set()`.  If either on is `< 0` libuEv now return `ERANGE`.
+
+
+[v1.4.1][] - 2016-04-22
+-----------------------
+
+### Changes
+- Add some `pkg-config` integration tips for developers using libuEv
+  with GNU autotools in their projects.
+
+### Fixes
+- Add missing `SFD_CLOEXEC` and `TFD_CLOEXEC` to signal and timer file
+  descriptors.  This prevents these file descriptors from "leaking" into
+  sub-processes of the parent thread.  The kernel will atomically close
+  these descriptors for forked-off children calling the exec*() family
+  of syscalls.
+- Minor coding style fixes and simplification of build scripts.
+
+
+[v1.4.0][] - 2016-03-22
+-----------------------
+
+This release changes the header file namespace, which was silently
+introduced in [v1.2.1][].  Apologies for any problems this may cause!
+
+### Changes
+- Change namespace for header files: `libuev/` to `uev/`, e.g. using
+  `pkg-config` your C program must now `#include <uev/uev.h>`
+- Support for `EPOLLPRI` events for I/O watchers, thanks to Markus Svilans
+- Simplified joystick example
+- Updated [README.md][] slightly
+
+
+[v1.3.1][] - 2016-02-02
+-----------------------
+
+### Fixes
+- Remove symlinks to Markdown files from GIT
+- Distribute and install Markdown files: [README.md][], etc.
+
+
+[v1.3.0][] - 2016-01-22
+-----------------------
+
+### Changes
+- Change to GNU configure and build system
+- Default optimization is now `-O2`, not `-Os`, which can be a bit
+  unpredictable with some cross compiler toolchains.  `-O2` is the
+  tried and tested path, and default in autotools
+- Added `-Wextra` to the previous `-W -Wall`, drop `-Werror`
+  which is supposed to be used by maintainer(s) only.
+
+
+[v1.2.4][] - 2015-11-23
+-----------------------

 ### Fixes

@@ -12,8 +156,8 @@ All notable changes to the project are documented in this file.
 - Make sure we don't inherit `LDFLAGS` from environment.


-[v1.2.3] - 2015-09-17
---------------------
+[v1.2.3][] - 2015-09-17
+-----------------------

 Very minor release.

@@ -24,12 +168,12 @@ Very minor release.
 - Dropped [TODO.md][] from distribution archives, only for devs

 ### Fixes
- Lots of Markdown syntax fixes in both README and ChangeLog
+- Lots of Markdown syntax fixes in both [README.md][] and ChangeLog
 - Silence annoying warning from newer GNU ar in Ubuntu 15.10


-[v1.2.2] - 2015-08-30
---------------------
+[v1.2.2][] - 2015-08-30
+-----------------------

 Minor bugfix release.

@@ -44,15 +188,15 @@ Minor bugfix release.
 - Fix issue #6: Segfault when stopping timer before calling `uev_exit()`


-[v1.2.1] - 2015-07-02
---------------------
+[v1.2.1][] - 2015-07-02
+-----------------------

 ### Changes
 - Private data members in `uev.h` have now been moved to a new file
  called `private.h`.  This will hopefully make it easier to understand
  what a user of libuEv is allowed to play around with.  Thanks to @vonj
  for the discussions around this!
- All builds of libuEv now default to use -fPIC, this bloats the code
+- All builds of libuEv now default to use `-fPIC`, this bloats the code
  slightly, but ensures that linking works for all use cases, withouth
  introducing unnecessary complexity.

@@ -64,8 +208,8 @@ Minor bugfix release.
  should use.  Thank you @vonj!


-[v1.2.0] - 2015-06-09
---------------------
+[v1.2.0][] - 2015-06-09
+-----------------------

 API change in event callbacks and fix timers that never start.

@@ -74,12 +218,12 @@ API change in event callbacks and fix timers that never start.
  change!  Please update all your callbacks if you upgrade.

 ### Fixes
- Fix timers that accidentally broke in [v1.1.0].
+- Fix timers that accidentally broke in [v1.1.0][].
 - Fixes to `bench.c`, it now actually listens to the pipe/socket.


-[v1.1.0] - 2015-03-04
---------------------
+[v1.1.0][] - 2015-03-04
+-----------------------

 Massively improved error handling.

@@ -96,11 +240,11 @@ Massively improved error handling.
 - Remove `test.c` from `DISTFILES` in `Makefile`.  You need the
  comeplete sources to build the examples now.  Thanks to @karasz for
  the heads up on this and the musl libc issue with missing `queue.h`!
- Fix broken link to [v1.0.5] in this file.
+- Fix broken link to [v1.0.5][] in this file.


-[v1.0.5] - 2015-02-15
---------------------
+[v1.0.5][] - 2015-02-15
+-----------------------

 ### Changes
 - Add `uev_*_start()` functions.
@@ -114,8 +258,8 @@ Massively improved error handling.
 - Further updates to [README.md][]


-[v1.0.4] - 2015-01-24
---------------------
+[v1.0.4][] - 2015-01-24
+-----------------------

 Minor documentation and build fixes.

@@ -127,8 +271,8 @@ Release mainly targeted for [Finit development](https://github.com/troglobit/fin
 * Minor update to Makefile, change how build progress is echoed


-[v1.0.3] - 2015-01-24
---------------------
+[v1.0.3][] - 2015-01-24
+-----------------------

 This is a very minor release, with a strong focus on documentation. 

@@ -140,25 +284,25 @@ This is a very minor release, with a strong focus on documentation.
 - Clang scan-build support added


-[v1.0.2] - 2015-01-07
---------------------
+[v1.0.2][] - 2015-01-07
+-----------------------

 ### Fixes
- Fix broken `make dist` target in [v1.0.1].
+- Fix broken `make dist` target in [v1.0.1][].


-[v1.0.1] - 2015-01-07
---------------------
+[v1.0.1][] - 2015-01-07
+-----------------------

 ### Changes
 - Cleanup and rewrite of [README.md][] after first audit by @vonj
 - Added API and example section to [README.md][]
- New [joystick.c] example added
+- New [joystick.c][] example added
 - `main.c:uev_run()`: Document mysterious flags parameter


-[v1.0.0] - 2013-08-06
---------------------
+[v1.0.0][] - 2013-08-06
+-----------------------

 First release in the new guise and API.

@@ -182,7 +326,18 @@ v0.0.1 - 2012-03-17
 Lua users mailing list.


-[UNRELEASED]: https://github.com/troglobit/libuev/compare/v1.2.3...HEAD
+[UNRELEASED]: https://github.com/troglobit/libuev/compare/v2.1.0...HEAD
+[v2.1.0]: https://github.com/troglobit/libuev/compare/v2.0.0...v2.1.0
+[v2.0.0]: https://github.com/troglobit/libuev/compare/v1.6.0...v2.0.0
+[v1.6.0]: https://github.com/troglobit/libuev/compare/v1.5.2...v1.6.0
+[v1.5.2]: https://github.com/troglobit/libuev/compare/v1.5.1...v1.5.2
+[v1.5.1]: https://github.com/troglobit/libuev/compare/v1.5.0...v1.5.1
+[v1.5.0]: https://github.com/troglobit/libuev/compare/v1.4.2...v1.5.0
+[v1.4.2]: https://github.com/troglobit/libuev/compare/v1.4.1...v1.4.2
+[v1.4.1]: https://github.com/troglobit/libuev/compare/v1.4.0...v1.4.1
+[v1.4.0]: https://github.com/troglobit/libuev/compare/v1.3.1...v1.4.0
+[v1.3.1]: https://github.com/troglobit/libuev/compare/v1.3.0...v1.3.1
+[v1.3.0]: https://github.com/troglobit/libuev/compare/v1.2.3...v1.3.0
 [v1.2.3]: https://github.com/troglobit/libuev/compare/v1.2.2...v1.2.3
 [v1.2.2]: https://github.com/troglobit/libuev/compare/v1.2.1...v1.2.2
 [v1.2.1]: https://github.com/troglobit/libuev/compare/v1.2.0...v1.2.1
@@ -195,6 +350,7 @@ Lua users mailing list.
 [v1.0.1]: https://github.com/troglobit/libuev/compare/v1.0.0...v1.0.1
 [v1.0.0]: https://github.com/troglobit/libuev/compare/v0.0.1...v1.0.0
 [TODO.md]: https://github.com/troglobit/libuev/blob/master/TODO.md
+[API.md]: https://github.com/troglobit/libuev/blob/master/API.md
 [README.md]: https://github.com/troglobit/libuev/blob/master/README.md
 [ChangeLog.md]: https://github.com/troglobit/libuev/blob/master/ChangeLog.md
 [joystick.c]: https://github.com/troglobit/libuev/blob/master/joystick.c
@@ -204,9 +360,3 @@ Lua users mailing list.
 [libuevent]: https://code.google.com/p/libuevent/
 [Flemming Madsen]: http://www.madsensoft.dk
 [Initial announcement]: http://lua-users.org/lists/lua-l/2012-03/msg00510.html
-
-<!--
-  -- Local Variables:
-  --  mode: markdown
-  -- End:
-  -->
@@ -1,5 +1,5 @@
 Copyright (c) 2012       Flemming Madsen <flemming!madsen()madsensoft!dk>
-Copyright (c) 2013-2015  Joachim Nilsson <troglobit()gmail!com>
+Copyright (c) 2013-2017  Joachim Nilsson <troglobit()gmail!com>

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -1,152 +0,0 @@
-# libuEv -- Simple event loop for Linux
-#
-# Copyright (c) 2012       Flemming Madsen <flemming!madsen()madsensoft!dk>
-# Copyright (c) 2013-2015  Joachim Nilsson <troglobit()gmail!com>
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in
-# all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-# THE SOFTWARE.
-#
-.PHONY: all test clean joystick test examples bench
-
-# Figure out root of library, unless used as submodule
-ROOTDIR    ?= $(shell pwd)
-
-#VERSION    = $(shell git tag -l | tail -1)
-VERSION     = 1.2.4
-NAME        = libuev
-PKG         = $(NAME)-$(VERSION)
-ARCHIVE     = $(PKG).tar.xz
-
-CC         ?= $(CROSS)gcc
-AR         ?= $(CROSS)ar
-STRIP      ?= $(CROSS)strip
-MAKE       := @$(MAKE)
-INSTALL    := install --backup=off
-STRIPINST  := $(INSTALL) -s --strip-program=$(CROSS)strip -m 0755
-
-CFLAGS     += -fPIC
-CFLAGS     += -Os
-CPPFLAGS   += -W -Wall -Werror
-LDFLAGS     = $(EXTRA_LDFLAGS)
-ARFLAGS     = crus
-MAKEFLAGS   = --no-print-directory --silent
-
-DISTFILES   = README ChangeLog LICENSE
-HEADERS     = uev.h private.h queue.h
-OBJS       := uev.o io.o timer.o signal.o
-SRCS       := $(OBJS:.o=.c)
-DEPS       := $(SRCS:.c=.d)
-JUNK        = *~ *.bak *.map .*.d *.so* *.a DEADJOE *.gdb *.elf core core.* *.html
-
-VER         = 1
-LIBNAME     = $(NAME)
-SOLIB       = $(LIBNAME).so.$(VER)
-SYMLIB      = $(LIBNAME).so
-STATICLIB   = $(LIBNAME).a
-TARGET      = $(STATICLIB) $(SOLIB)
-
-# Default install paths
-prefix     ?= /usr/local
-libdir     ?= $(prefix)/lib
-datadir    ?= $(prefix)/share/doc/$(LIBNAME)
-incdir     ?= $(prefix)/include
-
-export STATICLIB JUNK ROOTDIR CFLAGS CPPFLAGS
-
-# This magic trick looks like a comment, but works on BSD PMake
-#include <rules.mk>
-include rules.mk
-
-# Build rules
-all: $(TARGET)
-
-$(OBJS): Makefile
-
-$(SOLIB): Makefile $(OBJS)
-	@printf "  LINK    $@\n"
-	@$(CC) $(LDFLAGS) -shared -Wl,-soname=$@ -o $@ $(OBJS)
-
-$(STATICLIB): Makefile $(OBJS)
-	@printf "  ARCHIVE $@\n"
-	@$(AR) $(ARFLAGS) $@ $(OBJS) 2>/dev/null
-
-install-exec: all
-	@printf "  INSTALL $(DESTDIR)$(libdir)/$(SOLIB)\n"
-	@install -d $(DESTDIR)$(libdir)
-	@install $(SOLIB) $(DESTDIR)$(libdir)/$(SOLIB)
-	@ln -sf $(SOLIB) $(DESTDIR)$(libdir)/$(SYMLIB)
-
-install-dev:
-	@install -d $(DESTDIR)$(incdir)/$(LIBNAME)
-	@for file in $(HEADERS); do						\
-		printf "  INSTALL $(DESTDIR)$(incdir)/$(LIBNAME)/$$file\n";	\
-		install -m 0644 $$file $(DESTDIR)$(incdir)/$(LIBNAME)/$$file;	\
-	done
-	@printf "  INSTALL $(DESTDIR)$(libdir)/$(STATICLIB)\n"
-	@install -d $(DESTDIR)$(libdir)
-	@install $(STATICLIB) $(DESTDIR)$(libdir)/$(STATICLIB)
-	@install -d $(DESTDIR)$(datadir)
-	@for file in $(DISTFILES); do					\
-		printf "  INSTALL $(DESTDIR)$(datadir)/$$file\n";	\
-		install -m 0644 $$file $(DESTDIR)$(datadir)/$$file;	\
-	done
-
-install: install-exec install-dev
-
-uninstall:
-	-@$(RM) -r $(DESTDIR)$(datadir)
-	-@$(RM) -r $(DESTDIR)$(incdir)/$(LIBNAME)
-	-@$(RM) $(DESTDIR)$(libdir)/$(SOLIB)
-	-@$(RM) $(DESTDIR)$(libdir)/$(SYMLIB)
-	-@$(RM) $(DESTDIR)$(libdir)/$(STATICLIB)
-
-strip: $(TARGET)
-	@printf "  STRIP   %s\n" $(TARGET)
-	@$(STRIP) --strip-unneeded $(TARGET)
-	@size $(TARGET)
-
-bench: Makefile $(STATICLIB)
-	@printf "  RUN     %s\n" $@
-	@$(CC) $(CPPFLAGS) -D_GNU_SOURCE -g -o bench bench.c $(STATICLIB) && ./bench
-
-examples: all
-	@$(MAKE) -C examples
-
-test joystick: all
-	@$(MAKE) -C examples $@
-	@./examples/$@
-
-# Runs Clang scan-build on the whole tree
-check: clean
-	@scan-build $(MAKE) all
-
-clean:
-	-@$(MAKE) -C examples $@
-	-@$(RM) $(TARGET) *.o test joystick bench
-
-distclean: clean
-	-@$(MAKE) -C examples $@
-	-@$(RM) $(DEPS) $(JUNK)
-
-dist:
-	@echo "Building .xz tarball of $(PKG) in parent dir..."
-	git archive --format=tar --prefix=$(PKG)/ v$(VERSION) | xz >../$(ARCHIVE)
-	@(cd ..; md5sum $(ARCHIVE) | tee $(ARCHIVE).md5)
-
-# Include automatically generated rules
-include $(DEPS)
@@ -0,0 +1,46 @@
+ACLOCAL_AMFLAGS     = -I m4
+SUBDIRS             = src tests
+DIST_SUBDIRS        = src examples tests
+doc_DATA            = API.md README.md LICENSE
+EXTRA_DIST          = API.md README.md LICENSE AUTHORS ChangeLog.md
+
+if ENABLE_EXAMPLES
+SUBDIRS            += examples
+endif
+
+## Generate .deb package
+package:
+	@dpkg-buildpackage -uc -us -B
+
+## Generate MD5 checksum file
+MD5 = md5sum
+md5-dist:
+	@for file in $(DIST_ARCHIVES); do	\
+		$(MD5) $$file > $$file.md5;	\
+	done
+
+## Check if tagged in git
+release-hook:
+	if [ ! `git tag | grep $(PACKAGE_VERSION)` ]; then				\
+		echo;									\
+		printf "\e[1m\e[41mCannot find release tag $(PACKAGE_VERSION)\e[0m\n";	\
+		printf "\e[1m\e[5mDo release anyway?\e[0m "; read yorn;			\
+		if [ "$$yorn" != "y" -a "$$yorn" != "Y" ]; then				\
+			printf "OK, aborting release.\n";				\
+			exit 1;								\
+		fi;									\
+		echo;									\
+	else										\
+		echo;									\
+		printf "\e[1m\e[42mFound GIT release tag $(PACKAGE_VERSION)\e[0m\n";	\
+		printf "\e[1m\e[44m>>Remember to push tags!\e[0m\n";			\
+		echo;									\
+	fi
+
+## Target to run when building a release
+release: distcheck release-hook md5-dist
+	@for file in $(DIST_ARCHIVES); do						\
+		printf "$$file    \tDistribution tarball\n";				\
+		printf "$$file.md5\t"; cat $$file.md5 | cut -f1 -d' ';			\
+		mv $$file* ../;								\
+	done
@@ -1 +0,0 @@
-README.md
@@ -3,336 +3,115 @@ libuEv | Simple event loop for Linux
 [![Travis Status][]][Travis] [![Coverity Status][]][Coverity Scan]


-Table of Contents
-----------------
-
 * [Introduction](#introduction)
-* [API](#api)
-  * [Create an Event Context](#create-an-event-context)
-  * [Register an Event Watcher](#register-an-event-watcher)
-  * [Start Event Loop](#start-event-loop)
-  * [Summary](#summary)
-* [Joystick Example](#joystick-example)
+* [API](API.md#overview)
+  * [Create an Event Context](API.md#create-an-event-context)
+  * [Register an Event Watcher](API.md#register-an-event-watcher)
+  * [Start Event Loop](API.md#start-event-loop)
+  * [Summary](API.md#summary)
+* [Using -luev](API.md#using--luev)
+* [Joystick Example](API.md#joystick-example)
 * [Build & Install](#build--install)
 * [Origin & References](#origin--references)


+> **NOTE:** Incompatible failure mode changes in v2.0 compared to v1.x!
+
 Introduction
 ------------

-> “Why an event loop, why not use threads?”
-
-With the advent of light-weight processes (threads) programmers these
-days have a [golden hammer](http://c2.com/cgi/wiki?GoldenHammer) they
-often swing without consideration.  Event loops and non-blocking I/O is
-often a far easier approach, as well as less error prone.
-
-The purpose of many applications is, with a little logic sprinkled on
-top, to act on network packets entering an interface, timeouts expiring,
-mouse clicks, or other types of events.  Such applications are often
-very well suited to use an event loop.
-
-Applications that need to churn massively parallel algorithms are more
-suitable for running multiple (independent) threads on several CPU
-cores.  However, threaded applications must deal with the side effects
-of concurrency, like race conditions, deadlocks, live locks, etc.
-Writing error free threaded applications is hard, debugging them can be
-even harder.
-
-Sometimes the combination of multiple threads *and* an event loop per
-thread can be the best approach, but each application of course needs to
-be broken down individually to find the most optimal approach.  Do keep
-in mind, however, that not all systems your application will run on have
-multiple CPU cores -- some small embedded systems still use a single CPU
-core, even though they run Linux, with multiple threads a program may
-actually run slower!  Always profile your program, and if possible, test
-it on different architectures.
-
 [libuEv][] is a simple event loop in the style of the more established
 [libevent][1], [libev][2] and the venerable [Xt(3)][3] event loop.  The
 *u* (micro) in the name refers to both the small feature set and the
-small size overhead impact of the library.  The primary target of
-[libuEv][] is a modern Linux system.
+small size overhead impact of the library.

-Experienced developers may appreciate that [libuEv][] is built on top of
-modern Linux APIs: epoll, timerfd and signalfd.  Note, a certain amount
-of care is needed when dealing with APIs that employ signalfd.  For
-details, see [this article][4] at [lwn.net](http://lwn.net).
+Failure mode changes introduced in v2.0 may affect users of v1.x, See
+the [ChangeLog][] for the full details.

-> “Event driven software improves concurrency” -- [Dave Zarzycki, Apple]
+The [API documentation](API.md) is available as a separate document.


-API
---
+Example
+-------

-The C interface to [libuEv][] is very simple.  It handles three different
-types of events: I/O (files, sockets, message queues, etc.), timers, and
-signals.  With a slight caveat on signals
+Notice below how watcher `UEV_ERROR` conditions must be handled by each
+callback.  I/O watchers must also check for `UEV_HUP`.  Both errors are
+usually fatal, libuEv makes sure to stop each watcher before a callback
+runs, leaving it up to the callback to take appropriate action.

 ```C
+#include <stdio.h>
+#include <uev/uev.h>

-    /* Callback example, arg is passed from watcher's *_init()
-     * w->fd holds the file descriptor, events is set by libuEv
-     * to indicate if any of UEV_READ and/or UEV_WRITE is ready.
-     */
-    void callback       (uev_t *w, void *arg, int events);
-
-    /* Event loop:      Notice the use of flags! */
-    int uev_init        (uev_ctx_t *ctx);
-    int uev_exit        (uev_ctx_t *ctx);
-    int uev_run         (uev_ctx_t *ctx, int flags);         /* UEV_NONE, UEV_ONCE, and/or UEV_NONBLOCK */
-    
-    /* I/O watcher:     fd is non-blocking, events is UEV_READ and/or UEV_WRITE */
-    int uev_io_init     (uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, int fd, int events);
-    int uev_io_set      (uev_t *w, int fd, int events);
-    int uev_io_start    (uev_t *w);
-    int uev_io_stop     (uev_t *w);
-    
-    /* Timer watcher:   timeout and period in milliseconds */
-    int uev_timer_init  (uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, int timeout, int period);
-    int uev_timer_set   (uev_t *w, int timeout, int period); /* Change timeout or period */
-    int uev_timer_start (uev_t *w);                          /* Restart a stopped timer */
-    int uev_timer_stop  (uev_t *w);                          /* Stop a timer */
-    
-    /* Signal watcher:  signo is the signal to wait for, e.g., SIGTERM */
-    int uev_signal_init (uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, int signo);
-    int uev_signal_set  (uev_t *w, int signo);               /* Change signal to wait for */
-    int uev_signal_start(uev_t *w);                          /* Restart a stopped signal watcher */
-    int uev_signal_stop (uev_t *w);                          /* Stop signal watcher */
-
-```
-
-### Create an Event Context
-
-To monitor events the developer first creates an *event context*, this
-is achieved by calling `uev_init()` with a pointer to a (thread) local
-`uev_ctx_t` variable.
-
-```C
-
-    uev_ctx_t ctx;
-    
-    uev_init(&ctx);
-
-```
-
-### Register an Event Watcher
-
-For each event to be monitored, be it a signal, timer or a file
-descriptor, a *watcher* must be registered with the event context.  The
-watcher, an `uev_t`, is registered by calling the event type's `_init()`
-function with the `uev_ctx_t` context, the callback, and an optional
-argument.
-
-Here is a signal example:
-
-```C
-
-    void cleanup_exit(uev_t *w, void *arg, int events)
-    {
-        /* Graceful exit, with optional cleanup ... */
-        uev_exit(w->ctx);
+static void cb(uev_t *w, void *arg, int events)
+{
+    if (UEV_ERROR == events) {
+        puts("Problem with timer, attempting to restart.");
+        uev_timer_start(w);
    }
-    
-    int main(void)
-	{
-	    uev_t sigterm_watcher;
-        .
-		.
-		.
-        uev_signal_init(&ctx, &sigterm_watcher, cleanup_exit, NULL, SIGTERM);
-		.
-		.
-		.
-	}
+	puts("Every other second");
+}

+int main(void)
+{
+	uev_t timer;
+	uev_ctx_t ctx;
+
+	uev_init(&ctx);
+	/* Set up a timer watcher to call cb() every other second */
+	uev_timer_init(&ctx, &timer, cb, NULL, 0, 2 * 1000);
+
+	return uev_run(&ctx, 0);
+}
 ```

-### Start Event Loop
-
-When all watchers are registered, call the *event loop* with `uev_run()`
-and the argument to the event context.  The `flags` parameter can be
-used to integrate [libuEv][] into another event loop.
-
-In this example we set `flags` to none:
-
-```C
-
-    uev_run(&ctx, UEV_NONE);
-
-```
-
-With `flags` set to `UEV_ONCE` the event loop returns as soon as it has
-served the first event.  If `flags` is set to `UEV_ONCE | UEV_NONBLOCK`
-the event loop returns immediately if no event is available.
-
-**Note:** libuEv handles many types of errors, stream close, or peer
-shutdowns internally, but also lets the callback run.  This is useful
-for stateful connections to be able to detect EOF.
-
-### Summary
-
-1. Set up an event context with `uev_init()`
-2. Register event callbacks with the event context using
-   `uev_io_init()`, `uev_signal_init()` or `uev_timer_init()`
-3. Start the event loop with `uev_run()`
-4. Exit the event loop with `uev_exit()`, possibly from a callback
-
-**Note 1:** Make sure to use non-blocking stream I/O!  Most hard to find
-bugs in event driven applications are due to sockets and files being
-opened in blocking mode.  Be careful out there!
-
-**Note 2:** When closing a descriptor or socket, make sure to first stop
-  your watcher, if possible.  This will help prevent any nasty side
-  effects on your program.
-
-**Note 3:** As mentioned above, a certain amount of care is needed when
-dealing with signalfd.  This means that if your application, for
-instance, uses `system()` you must redesign that to use `fork()`, and
-then in the child, unblock all signals blocked by your parent process,
-before you run `exec()`.  This because Linux does not unblock signals
-for your children, and neither does most (all?) C-libraries.  An example
-of this, from [finit][6], implementing `run()` as a better replacement
-to `system()`, which sucks anyawy :)
-
-
-Joystick Example
----------------
-
-Here follows a very brief example to illustrate how one can use
-[libuEv][] to act upon joystick input.
-
-```C
-
-    #include <err.h>
-    #include <errno.h>
-    #include <stdio.h>
-    #include <stdint.h>
-    #include <fcntl.h>
-    #include <unistd.h>
-    
-    #include "uev.h"
-    
-    struct js_event {
-    	uint32_t time;		/* event timestamp in milliseconds */
-    	int16_t  value;		/* value */
-    	uint8_t  type;		/* event type */
-    	uint8_t  number;	/* axis/button number */
-    } e;
-    
-    static void joystick_cb(uev_t *w, void *arg, int events)
-    {
-    	read (w->fd, &e, sizeof(e));
-    
-    	switch (e.type) {
-    	case 1:
-    		if (e.value) printf("Button %d pressed\n", e.number);
-    		else 	     printf("Button %d released\n", e.number);
-    		break;
-    
-    	case 2:
-    		printf("Joystick axis %d moved, value %d!\n", e.number, e.value);
-    		break;
-    	}
-    }
-    
-    int main(void)
-    {
-    	int       fd = open("/dev/input/js1", O_RDONLY, O_NONBLOCK);
-    	uev_t     js1_watcher;
-    	uev_ctx_t ctx;
-    
-    	if (fd < 0)
-    		errx(errno, "Cannot find a joystick attached.");
-    
-    	uev_init(&ctx);
-    	uev_io_init(&ctx, &js1_watcher, joystick_cb, NULL, fd, UEV_READ);
-    
-    	puts("Starting, press Ctrl-C to exit.");
-    
-    	return uev_run(&ctx, 0);
-    }
-
-```
-
-To compile the program, save the code as `joystick.c` and call GCC with
-`gcc -o joystick joystick.c io.c timer.c signal.c main.c` from this
-directory, skips using a Makefile altogether.  Alternatively, call the
-`Makefile` with <kbd>make joystick</kbd> from this directory.
-
-More complete and relevant example uses of [libuEv][] is the TFTP/FTP
-server [uftpd][5], and the Linux `/sbin/init` replacement [finit][6].
-Both use [libuEv][] as a GIT submodule.
-
-Also see the `bench.c` program (<kbd>make bench</kbd> from within the
-library) for [reference benchmarks][7] against [libevent][1] and
-[libev][2].
-

 Build & Install
 ---------------

-The library is built for and developed on GNU/Linux systems, so it may
-use GCC and GNU Make specific extensions here and there.  This is not on
-purpose and patches to correct this are most welcome.  Particularly
-patches to support *BSD and its kqueue interface.
+libuEv use the GNU configure and build system.  To try out the bundled
+examples, use the `--enable-examples` switch to the `configure` script.
+There is also a limited unit test suite that can be useful to learn how
+the library works.

-* <kbd>make all</kbd>: The library
-* <kbd>make test</kbd>: Test and showcase
-* <kbd>make install</kbd>: Honors `$prefix` and `$DESTDIR` environment variables
+```sh
+./configure
+make -j5
+make test
+sudo make install-strip
+sudo ldconfig
+```

-Size of [libuEv][]:
-
-    $ make strip
-    CC      main.o
-    CC      io.o
-    CC      timer.o
-    CC      signal.o
-    ARCHIVE libuev.a
-    LINK    libuev.so.1
-    STRIP   libuev.a
-    STRIP   libuev.so.1
-    text	   data	    bss	    dec	    hex	filename
-    1177	      0	      0	   1177	    499	main.o     (ex libuev.a)
-     308	      0	      0	    308	    134	io.o       (ex libuev.a)
-     682	      0	      0	    682	    2aa	timer.o    (ex libuev.a)
-     563	      0	      0	    563	    233	signal.o   (ex libuev.a)
-    6306	    768	      8	   7082	   1baa	libuev.so.1
+The resulting .so file is ~14 kiB.


 Origin & References
--------------------
+-------------------

-[libuEv][] was originally based on [LibUEvent][8] by [Flemming Madsen]
-but has been completely rewritten with a much clearer API.  Now more
-similar to the famous [libev][2] by [Mark Lehmann][].  Another small
-event library used for inspiration is the very small [Picoev][9] by
-[Oku Kazuho][].
+[libuEv][] originates from [LibUEvent][8] by [Flemming Madsen][], but
+with a rewritten and much cleaner API.  It is now more similar to the
+famous [libev][2] by [Mark Lehmann][].  Another library inspiring this
+project is [picoev][9] by [Oku Kazuho][].
+
+[libuEv][] is developed and maintained by [Joachim Nilsson][].  It is
+built for and developed on GNU/Linux systems, patches to support *BSD
+and its [kqueue][] interface are most welcome.

-[libuEv][] is developed and maintained by [Joachim Nilsson][].

 [1]: http://libevent.org
 [2]: http://software.schmorp.de/pkg/libev.html
 [3]: http://unix.com/man-page/All/3x/XtDispatchEvent
-[4]: http://lwn.net/Articles/415684/
-[5]: https://github.com/troglobit/uftpd
-[6]: https://github.com/troglobit/finit
-[7]: http://libev.schmorp.de/bench.html
 [8]: http://code.google.com/p/libuevent/
 [9]: https://github.com/kazuho/picoev
+[ChangeLog]:       https://github.com/troglobit/libuev/blob/master/ChangeLog.md
 [Travis]:          https://travis-ci.org/troglobit/libuev
 [Travis Status]:   https://travis-ci.org/troglobit/libuev.png?branch=master
 [Coverity Scan]:   https://scan.coverity.com/projects/3846
 [Coverity Status]: https://scan.coverity.com/projects/3846/badge.svg
 [LibuEv]:          https://github.com/troglobit/libuev
+[kqueue]:          https://github.com/mheily/libkqueue
 [Oku Kazuho]:      https://github.com/kazuho
 [Mark Lehmann]:    http://software.schmorp.de
 [Joachim Nilsson]: http://troglobit.com
 [Flemming Madsen]: http://www.madsensoft.dk
 [Dave Zarzycki, Apple]: http://www.youtube.com/watch?v=cD_s6Fjdri8
-
-<!--
-  -- Local Variables:
-  --  mode: markdown
-  -- End:
-  -->
@@ -1 +0,0 @@
-TODO.md
@@ -1,5 +1,9 @@
 LibuEv TODO
 ===========

-* Make port to *BSD kqueue API, http://en.wikipedia.org/wiki/Kqueue
+* Add standard UNIX backend with select() and timer_create()
+  See SMCRoute and toolbox for examples.
+* Port to *BSD kqueue API, http://en.wikipedia.org/wiki/Kqueue
+  Also in UNIX Network Progamming, by W. Richard Stevens 3rd ed.
+* Restore Lua bindings now that libuEv itself has stabilized

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+autoreconf -W portability -visfm
@@ -0,0 +1,20 @@
+AC_INIT(libuev, 2.1.0, https://github.com/troglobit/libuev/issues)
+AM_INIT_AUTOMAKE([1.11 foreign no-dist-gzip dist-xz])
+AM_SILENT_RULES([yes])
+
+AC_CONFIG_SRCDIR(src/uev.c)
+AM_CONFIG_HEADER(config.h)
+AC_CONFIG_FILES([Makefile src/libuev.pc src/Makefile examples/Makefile tests/Makefile])
+AC_CONFIG_MACRO_DIR([m4])
+
+AC_PROG_CC
+AM_PROG_AR
+LT_INIT
+
+# Optional features
+AC_ARG_ENABLE([examples],
+	[AC_HELP_STRING([--enable-examples], [Build libuEv examples/ directory])],
+	[], [enable_examples=no])
+AM_CONDITIONAL([ENABLE_EXAMPLES], [test "$enable_examples" = yes])
+
+AC_OUTPUT
@@ -0,0 +1,8 @@
+tmp/*
+libuev/*
+libuev*
+autoreconf*
+debhelper*
+files
+!*.dirs
+!*.install
@@ -0,0 +1,14 @@
+libuEv for Debian
+-----------------
+
+This is the upstream pre-packaged version of libuEv.  It consists of two
+.deb packages: one with only the .so library and one -dev package with
+headers and the .a library for static linking.  It builds on any Debian
+based operating system, e.g.  Debian, Ubuntu, Linux Mint, etc.
+
+Recommended reading is the upstream README and API docs.
+
+     less /usr/share/doc/libuev-dev/README.md
+    zless /usr/share/doc/libuev-dev/API.md.gz
+
+ -- Joachim Nilsson <troglobit@gmail.com>  Thu, 21 Sep 18:10, 2017
@@ -0,0 +1,31 @@
+libuev (2.0.0-1) unstable; urgency=medium
+
+  * Major new upstream version, possibly incompatible changes to both
+    uev_run() and how watchers are called in various failure modes.
+
+    - uev_run() no longer exits the main event loop if an unrecoverable
+      error with a watcher occurs.  Instead, the watcher is disabled and
+      the callback is run one last time with events set to UEV_ERROR.
+    - Watcher callbacks must handle UEV_ERROR conditions.  This pertains
+      in particular to signal and timer watchers.
+
+ -- Joachim Nilsson <troglobit@gmail.com>  Sat, 11 Nov 2017 16:31:46 +0100
+
+libuev (1.6.0-1) unstable; urgency=medium
+
+  * Support for edge triggered and oneshot event types
+  * Support for 64 bit time_t on 32 bit GLIBC systems
+
+ -- Joachim Nilsson <troglobit@gmail.com>  Mon, 18 Sep 2017 07:49:23 +0200
+
+libuev (1.5.2-2) unstable; urgency=low
+
+  * Minor packaging fixes.
+
+ -- Joachim Nilsson <troglobit@gmail.com>  Sun, 12 Mar 2017 17:48:00 +0100
+
+libuev (1.5.2-1) unstable; urgency=low
+
+  * Initial release.
+
+ -- Joachim Nilsson <troglobit@gmail.com>  Mon, 28 Nov 2016 22:53:35 +0100
@@ -0,0 +1 @@
+config.log
@@ -0,0 +1 @@
+9
@@ -0,0 +1,39 @@
+Source: libuev
+Priority: optional
+Maintainer: Joachim Nilsson <troglobit@gmail.com>
+Build-Depends: dpkg-dev (>= 1.14.9), debhelper (>= 9), dh-autoreconf
+Standards-Version: 3.9.6
+Section: libs
+Homepage: https://github.com/troglobit/libuev/
+Vcs-Git: https://github.com/troglobit/libuev.git
+Vcs-Browser: https://github.com/troglobit/libuev/
+
+Package: libuev-dev
+Priority: extra
+Section: libdevel
+Architecture: any
+Depends: ${misc:Depends}, libuev (= ${binary:Version})
+Description: static library, header files, and docs for libuev
+ Static library, header files, and documentation for libuev.
+ .
+ libuEv is a simple event loop in the style of the more established
+ libevent, libev and the venerable Xt(3) event loop. The u (micro) in the
+ name refers to both the small feature set and the small size overhead
+ impact of the library.
+ .
+ Experienced developers may appreciate that libuEv is built on top of
+ modern Linux APIs: epoll, timerfd and signalfd. Note however, a certain
+ amount of care is needed when dealing with APIs that employ signalfd.
+
+Package: libuev
+Architecture: any
+Depends: ${misc:Depends}, ${shlibs:Depends}
+Description: Lightweight event loop library
+ libuEv is a simple event loop in the style of the more established
+ libevent, libev and the venerable Xt(3) event loop. The u (micro) in the
+ name refers to both the small feature set and the small size overhead
+ impact of the library.
+ .
+ Experienced developers may appreciate that libuEv is built on top of
+ modern Linux APIs: epoll, timerfd and signalfd. Note however, a certain
+ amount of care is needed when dealing with APIs that employ signalfd.
@@ -0,0 +1,26 @@
+Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Source: https.//github.com/troglobit/libuev/
+
+Files: *
+Copyright: 2013-2017 Joachim Nilsson <troglobit@gmail.com>
+License: MIT
+Copyright (c) 2012       Flemming Madsen <flemming!madsen()madsensoft!dk>
+Copyright (c) 2013-2017  Joachim Nilsson <troglobit()gmail!com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
@@ -0,0 +1,2 @@
+API.md
+README.md
@@ -0,0 +1,2 @@
+usr/lib
+usr/include
@@ -0,0 +1,6 @@
+usr/include/uev/uev.h
+usr/include/uev/private.h
+usr/include/uev/queue.h
+usr/lib/*/lib*.a
+usr/lib/*/lib*.so
+usr/lib/*/pkgconfig/lib*.pc
@@ -0,0 +1 @@
+usr/lib
@@ -0,0 +1 @@
+usr/lib/*/lib*.so.*
@@ -0,0 +1,10 @@
+#!/usr/bin/make -f           
+
+# Uncomment this to turn on verbose mode.
+#export DH_VERBOSE=1
+
+%:
+	dh $@ --with autoreconf
+
+override_dh_compress:
+	dh_compress -A -X.md
@@ -0,0 +1 @@
+3.0 (native)
@@ -0,0 +1,6 @@
+joystick
+signal
+cronrun
+test
+redirect
+hej.txt
@@ -1,54 +0,0 @@
-# libuEv examples
-#
-# Copyright (c) 2012       Flemming Madsen <flemming!madsen()madsensoft!dk>
-# Copyright (c) 2013-2015  Joachim Nilsson <troglobit()gmail!com>
-#
-# Permission is hereby granted, free of charge, to any person obtaining
-# a copy of this software and associated documentation files (the
-# "Software"), to deal in the Software without restriction, including
-# without limitation the rights to use, copy, modify, merge, publish,
-# distribute, sublicense, and/or sell copies of the Software, and to
-# permit persons to whom the Software is furnished to do so, subject to
-# the following conditions:
-#
-# The above copyright notice and this permission notice shall be
-# included in all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
-# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-#
-.PHONY: all clean
-
-TARGET      = signal test joystick
-OBJS       := $(addsuffix .o, $(TARGET))
-SRCS       := $(OBJS:.o=.c)
-DEPS       := $(SRCS:.c=.d)
-CPPFLAGS   += -I../
-LDFLAGS    := -L../
-LDLIBS     := ../$(STATICLIB)
-
-# This magic trick looks like a comment, but works on BSD PMake
-#include <../rules.mk>
-include ../rules.mk
-
-all: $(TARGET)
-
-signal: signal.o
-
-test: test.o
-
-joystick: joystick.o
-
-clean:
-	-@$(RM) $(TARGET) *.o
-
-distclean: clean
-	-@$(RM) $(DEPS) $(JUNK)
-
-# Include automatically generated rules
-include $(DEPS)
@@ -0,0 +1,3 @@
+noinst_PROGRAMS = joystick redirect
+AM_CPPFLAGS     = -I$(top_srcdir)/src
+LDADD           = $(top_srcdir)/src/libuev.la
@@ -1,6 +1,6 @@
 /* Simple example of how to use libuEv with Linux joystick API
 *
- * Copyright (c) 2014-2015  Joachim Nilsson <troglobit()gmail!com>
+ * Copyright (c) 2014-2017  Joachim Nilsson <troglobit()gmail!com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
@@ -30,8 +30,6 @@

 #include "uev.h"

-#define UNUSED(arg) arg __attribute__ ((unused))
-
 struct js_event {
 	uint32_t time;		/* event timestamp in milliseconds */
 	int16_t  value;		/* value */
@@ -39,15 +37,33 @@ struct js_event {
 	uint8_t  number;	/* axis/button number */
 } e;

-static void joystick_cb(uev_t *w, void *UNUSED(arg), int UNUSED(events))
+/*
+ * Always check for UEV_ERROR in watcher callback!
+ * Possibly joystick was unplugged
+ */
+static void joystick_cb(uev_t *w, void *arg, int events)
 {
-	if (read (w->fd, &e, sizeof(e)) < 0)
-		errx(errno, "Failed reading joystick event");
+	ssize_t len;
+
+	if (UEV_ERROR == events) {
+		warnx("Spurious problem with the joystick watcher, restarting.");
+		uev_io_start(w);
+	}
+
+	len = read(w->fd, &e, sizeof(e));
+	if (len < 0) {
+		warn("Failed reading joystick event");
+		return;
+	}
+
+	if (len == 0 || UEV_HUP == events) {
+		warn("Joystick disconnected");
+		return;
+	}

 	switch (e.type) {
 	case 1:
-		if (e.value) printf("Button %d pressed\n", e.number);
-		else 	     printf("Button %d released\n", e.number);
+		printf("Button %d %s\n", e.number, e.value ? "pressed" : "released");
 		break;

 	case 2:
@@ -58,10 +74,11 @@ static void joystick_cb(uev_t *w, void *UNUSED(arg), int UNUSED(events))

 int main(void)
 {
-	int       fd = open("/dev/input/js1", O_RDONLY, O_NONBLOCK);
-	uev_t     js1_watcher;
+	int fd;
+	uev_t js1_watcher;
 	uev_ctx_t ctx;

+	fd = open("/dev/input/js1", O_RDONLY, O_NONBLOCK);
 	if (fd < 0)
 		errx(errno, "Cannot find a joystick attached.");

@@ -75,8 +92,7 @@ int main(void)

 /**
 * Local Variables:
- *  compile-command: "gcc -o joystick joystick.c io.o timer.o signal.o main.o"
- *  version-control: t
+ *  compile-command: "make joystick"
 *  indent-tabs-mode: t
 *  c-file-style: "linux"
 * End:
@@ -0,0 +1,69 @@
+/* Example of how to handle stdin redirect
+ *
+ * The problem is non-trivial since Linux epoll, which libuEv uses, does
+ * not support I/O watchers for regular files or directories.
+ *
+ * This works:
+ *                  echo foo | redirect
+ * This doesn't:
+ *                  redirect < foo.txt
+ *
+ * However, with a little bit of hacking libuEv can be made to handle
+ * reading from stdin as a special case.
+ */
+
+#include <err.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include "src/uev.h"
+
+void process_stdin(uev_t *w, void *arg, int events)
+{
+	char buf[256];
+	int len;
+
+	if (UEV_ERROR == events) {
+		warnx("Spurious problem with the stdin watcher, restarting.");
+		uev_io_start(w);
+	}
+
+	len = read(w->fd, buf, sizeof(buf));
+	if (len == -1) {
+		warn("Error reading from stdin");
+		return;
+	}
+
+	if (len == 0 || UEV_HUP == events) {
+		warnx("Connection closed.");
+		return;
+	}
+
+	printf("Read %d bytes\n", len);
+	if (write(STDOUT_FILENO, buf, len) != len)
+		warn("Failed writing to stdout");
+}
+
+int main(int argc, char **argv)
+{
+	int ret;
+	uev_t watcher;
+	uev_ctx_t ctx;
+
+	uev_init(&ctx);
+
+	ret = uev_io_init(&ctx, &watcher, process_stdin, NULL, STDIN_FILENO, UEV_READ);
+	if (ret)
+		err(errno, "Failed setting up STDIN watcher");
+
+	return uev_run(&ctx, 0);
+}
+
+/**
+ * Local Variables:
+ *  compile-command: "make redirect; echo hej > hej.txt; ./redirect < hej.txt"
+ *  indent-tabs-mode: t
+ *  c-file-style: "linux"
+ * End:
+ */
@@ -0,0 +1 @@
+*.m4
@@ -1,9 +0,0 @@
-# Pretty printing and GCC -M for auto dep files
-%.o: %.c
-	@printf "  CC      $(subst $(ROOTDIR)/,,$(shell pwd)/)$@\n"
-	@$(CC) $(CFLAGS) $(CPPFLAGS) -c -MMD -MP -o $@ $<
-
-%: %.o
-	@printf "  LINK    $(subst $(ROOTDIR)/,,$(shell pwd)/)$@\n"
-	@$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-Map,$@.map -o $@ $^ $(LDLIBS$(LDLIBS-$(@)))
-
@@ -0,0 +1,14 @@
+lib_LTLIBRARIES     = libuev.la
+libuev_la_SOURCES   = uev.c io.c timer.c signal.c cron.c
+libuev_la_CPPFLAGS  = -D_GNU_SOURCE -D_TIME_BITS=64
+libuev_la_CFLAGS    = -W -Wall -Wextra
+libuev_la_LDFLAGS   = $(AM_LDFLAGS) -version-info 2:0:0
+
+noinst_PROGRAMS     = bench
+bench_CPPFLAGS      = -D_GNU_SOURCE
+bench_LDADD         = libuev.la
+
+pkgconfigdir        = $(libdir)/pkgconfig
+pkgincludedir       = $(includedir)/uev
+pkgconfig_DATA      = libuev.pc
+pkginclude_HEADERS  = uev.h private.h queue.h
@@ -0,0 +1 @@
+../API.md
@@ -44,11 +44,11 @@

 #include <errno.h>
 #include <fcntl.h>
+#include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/resource.h>
-#include <sys/signal.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/time.h>
@@ -140,7 +140,8 @@ static struct timeval *run_once(uev_ctx_t *ctx)

 		gettimeofday(&te, NULL);

-//		if (xcount != count) fprintf(stderr, "Xcount: %d, Rcount: %d\n", xcount, count);
+		if (xcount != count)
+			fprintf(stderr, "Xcount: %d, Rcount: %d\n", xcount, count);
 	}

 	timersub(&te, &ta, &ta);
@@ -229,7 +230,6 @@ int main(int argc, char **argv)

 /**
 * Local Variables:
- *  version-control: t
 *  indent-tabs-mode: t
 *  c-file-style: "linux"
 * End:
@@ -0,0 +1,165 @@
+/* libuEv - Micro event loop library
+ *
+ * Copyright (c) 2012       Flemming Madsen <flemming!madsen()madsensoft!dk>
+ * Copyright (c) 2013-2017  Joachim Nilsson <troglobit()gmail!com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <errno.h>
+#include <string.h>		/* memset() */
+#include <sys/timerfd.h>
+#include <unistd.h>		/* close(), read() */
+
+#include "uev.h"
+
+/* Missing defines in GLIBC <= 2.24 */
+#ifndef TFD_TIMER_CANCEL_ON_SET
+#define TFD_TIMER_CANCEL_ON_SET (1 << 1)
+#endif
+#ifndef TFD_SETTIME_FLAGS
+#define TFD_SETTIME_FLAGS (TFD_TIMER_ABSTIME | TFD_TIMER_CANCEL_ON_SET)
+#endif
+
+
+/**
+ * Create and start an at/cron job watcher
+ * @param ctx      A valid libuEv context
+ * @param w        Pointer to an uev_t watcher
+ * @param cb       Callback function for cron job
+ * @param arg      Optional callback argument
+ * @param when     First point in time to call @param cb
+ * @param interval For an at job this is zero, for cron the offset interval
+ *
+ * For at jobs set @param interval to zero and only use @param when.  For
+ * cron jobs, set @param interval to the offset.  E.g., if the job should
+ * run every five minutes set the @param tm_min of struct tm to five.
+ *
+ * Use mktime() to create the time_t arguments.  The special value zero
+ * may be used for @param when to denote 'now', where 'now' is when the
+ * event loop is started.  You can also treat time_t simply as a signed
+ * integer.  E.g., set @param interval to 3600 to create a cron job that
+ * runs every hour.
+ *
+ * @return POSIX OK(0) or non-zero with @param errno set on error.
+ */
+int uev_cron_init(uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, time_t when, time_t interval)
+{
+	int fd;
+
+	if (when < 0 || interval < 0) {
+		errno = ERANGE;
+		return -1;
+	}
+
+	fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK | TFD_CLOEXEC);
+	if (fd < 0)
+		return -1;
+
+	if (_uev_watcher_init(ctx, w, UEV_CRON_TYPE, cb, arg, fd, UEV_READ))
+		goto exit;
+
+	if (uev_cron_set(w, when, interval)) {
+		_uev_watcher_stop(w);
+	exit:
+		close(fd);
+		return -1;
+	}
+
+	return 0;
+}
+
+/**
+ * Reset an at/cron job watcher
+ * @param w        Watcher to reset
+ * @param when     First point in time to call @param cb
+ * @param interval For an at job this is zero, for cron the offset interval
+ *
+ * @return POSIX OK(0) or non-zero with @param errno set on error.
+ */
+int uev_cron_set(uev_t *w, time_t when, time_t interval)
+{
+	/* Every watcher must be registered to a context */
+	if (!w || !w->ctx) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (when < 0 || interval < 0) {
+		errno = ERANGE;
+		return -1;
+	}
+
+	/* Handle stopped timers */
+	if (w->fd < 0) {
+		/* Timer already stopped */
+		if (!when && !interval)
+			return 0;
+
+		/* Remove from internal list */
+		LIST_REMOVE(w, link);
+
+		if (uev_cron_init(w->ctx, w, (uev_cb_t *)w->cb, w->arg, when, interval))
+			return -1;
+	}
+
+	w->u.c.when     = when;
+	w->u.c.interval = interval;
+
+	if (w->ctx->running) {
+		struct itimerspec time;
+
+		memset(&time, 0, sizeof(time));
+		time.it_value.tv_sec    = when;
+		time.it_interval.tv_sec = interval;
+		if (timerfd_settime(w->fd, TFD_SETTIME_FLAGS, &time, NULL) < 0)
+			return 1;
+	}
+
+	return _uev_watcher_start(w);
+}
+
+/**
+ * Start a stopped at/cron job watcher
+ * @param w  Watcher to start (again)
+ *
+ * @return POSIX OK(0) or non-zero with @param errno set on error.
+ */
+int uev_cron_start(uev_t *w)
+{
+	return uev_timer_start(w);
+}
+
+/**
+ * Stop and unregister an at/cron job watcher
+ * @param w  Watcher to stop
+ *
+ * @return POSIX OK(0) or non-zero with @param errno set on error.
+ */
+int uev_cron_stop(uev_t *w)
+{
+	return uev_timer_stop(w);
+}
+
+/**
+ * Local Variables:
+ *  indent-tabs-mode: t
+ *  c-file-style: "linux"
+ * End:
+ */
@@ -1,7 +1,7 @@
 /* libuEv - Micro event loop library
 *
 * Copyright (c) 2012       Flemming Madsen <flemming!madsen()madsensoft!dk>
- * Copyright (c) 2013-2015  Joachim Nilsson <troglobit()gmail!com>
+ * Copyright (c) 2013-2017  Joachim Nilsson <troglobit()gmail!com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
@@ -23,7 +23,6 @@
 */

 #include <errno.h>
-
 #include "uev.h"


@@ -34,7 +33,7 @@
 * @param cb      I/O callback
 * @param arg     Optional callback argument
 * @param fd      File descriptor to watch, or -1 to register an empty watcher
- * @param events  Requested events to watch for, a mask of %UEV_READ and %UEV_WRITE
+ * @param events  Events to watch for: %UEV_READ, %UEV_WRITE, %UEV_EDGE, %UEV_ONESHOW
 *
 * @return POSIX OK(0) or non-zero with @param errno set on error.
 */
@@ -45,10 +44,10 @@ int uev_io_init(uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, int fd, int e
 		return -1;
 	}

-	if (uev_watcher_init(ctx, w, UEV_IO_TYPE, cb, arg, fd, events))
+	if (_uev_watcher_init(ctx, w, UEV_IO_TYPE, cb, arg, fd, events))
 		return -1;

-	return uev_watcher_start(w);
+	return _uev_watcher_start(w);
 }

 /**
@@ -61,6 +60,10 @@ int uev_io_init(uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, int fd, int e
 */
 int uev_io_set(uev_t *w, int fd, int events)
 {
+
+	if ((events & UEV_ONESHOT) && _uev_watcher_active(w))
+		return _uev_watcher_rearm(w);
+
 	/* Ignore any errors, only to clean up anything lingering ... */
 	uev_io_stop(w);

@@ -86,12 +89,11 @@ int uev_io_start(uev_t *w)
 */
 int uev_io_stop(uev_t *w)
 {
-	return uev_watcher_stop(w);
+	return _uev_watcher_stop(w);
 }

 /**
 * Local Variables:
- *  version-control: t
 *  indent-tabs-mode: t
 *  c-file-style: "linux"
 * End:
@@ -0,0 +1,12 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: @PACKAGE@
+Description: Simple event loop for Linux
+Version: @VERSION@
+Requires:
+Libs: -L${libdir} -luev
+Cflags: -I${includedir}
+
@@ -32,19 +32,20 @@
 /* I/O, timer, or signal watcher */
 typedef enum {
 	UEV_IO_TYPE = 1,
-	UEV_TIMER_TYPE,
 	UEV_SIGNAL_TYPE,
+	UEV_TIMER_TYPE,
+	UEV_CRON_TYPE,
 } uev_type_t;

 /* Event mask, used internally only. */
-#define UEV_EVENT_MASK  (UEV_READ | UEV_WRITE)
+#define UEV_EVENT_MASK  (UEV_ERROR | UEV_READ | UEV_WRITE | UEV_PRI | UEV_HUP | UEV_RDHUP | UEV_EDGE | UEV_ONESHOT)

 /* Main libuEv context type */
 typedef struct {
 	int             running;
 	int             fd;     /* For epoll() */
-	uint32_t        errors;
 	LIST_HEAD(,uev) watchers;
+	uint32_t        workaround; /* For workarounds, e.g. redirected stdin */
 } uev_ctx_t;

 /* Forward declare due to dependencys, don't try this at home kids. */
@@ -61,28 +62,37 @@ struct uev;
 	void          (*cb)(struct uev *, void *, int);         \
 	void           *arg;                                    \
 								\
-	/* Timer watchers, time in milliseconds */		\
-	int             timeout;                                \
-	int             period;                                 \
+	/* Arguments for different watchers */			\
+	union {							\
+		/* Cron watchers */				\
+		struct {					\
+			time_t when;				\
+			time_t interval;			\
+		} c;						\
 								\
-	/* Signal watchers */                                   \
-	int             signo;                                  \
+		/* Timer watchers, time in milliseconds */	\
+		struct {					\
+			int timeout;				\
+			int period;				\
+		} t;						\
+	} u;							\
 								\
 	/* Watcher type */					\
 	uev_type_t

 /* Internal API for dealing with generic watchers */
-int uev_watcher_init (uev_ctx_t *ctx, struct uev *w, uev_type_t type,
-		      void (*cb)(struct uev *, void *, int), void *arg,
-		      int fd, int events);
-int uev_watcher_start(struct uev *w);
-int uev_watcher_stop (struct uev *w);
+int _uev_watcher_init  (uev_ctx_t *ctx, struct uev *w, uev_type_t type,
+			void (*cb)(struct uev *, void *, int), void *arg,
+			int fd, int events);
+int _uev_watcher_start (struct uev *w);
+int _uev_watcher_stop  (struct uev *w);
+int _uev_watcher_active(struct uev *w);
+int _uev_watcher_rearm (struct uev *w);

 #endif /* LIBUEV_PRIVATE_H_ */

 /**
 * Local Variables:
- *  version-control: t
 *  indent-tabs-mode: t
 *  c-file-style: "linux"
 * End:
@@ -1,7 +1,7 @@
 /* libuEv - Micro event loop library
 *
 * Copyright (c) 2012       Flemming Madsen <flemming!madsen()madsensoft!dk>
- * Copyright (c) 2013-2015  Joachim Nilsson <troglobit()gmail!com>
+ * Copyright (c) 2013-2017  Joachim Nilsson <troglobit()gmail!com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
@@ -52,15 +52,15 @@ int uev_signal_init(uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, int signo
 	w->fd = -1;

 	sigemptyset(&mask);
-	fd = signalfd(-1, &mask, SFD_NONBLOCK);
+	fd = signalfd(-1, &mask, SFD_NONBLOCK | SFD_CLOEXEC);
 	if (fd < 0)
 		return -1;

-	if (uev_watcher_init(ctx, w, UEV_SIGNAL_TYPE, cb, arg, fd, UEV_READ))
+	if (_uev_watcher_init(ctx, w, UEV_SIGNAL_TYPE, cb, arg, fd, UEV_READ))
 		goto exit;

 	if (uev_signal_set(w, signo)) {
-		uev_watcher_stop(w);
+		_uev_watcher_stop(w);
 	exit:
 		close(fd);
 		return -1;
@@ -109,7 +109,7 @@ int uev_signal_set(uev_t *w, int signo)
 	if (signalfd(w->fd, &mask, SFD_NONBLOCK) < 0)
 		return -1;

-	return uev_watcher_start(w);
+	return _uev_watcher_start(w);
 }


@@ -140,7 +140,7 @@ int uev_signal_start(uev_t *w)
 */
 int uev_signal_stop(uev_t *w)
 {
-	if (uev_watcher_stop(w))
+	if (_uev_watcher_stop(w))
 		return -1;

 	close(w->fd);
@@ -151,7 +151,6 @@ int uev_signal_stop(uev_t *w)

 /**
 * Local Variables:
- *  version-control: t
 *  indent-tabs-mode: t
 *  c-file-style: "linux"
 * End:
@@ -1,7 +1,7 @@
 /* libuEv - Micro event loop library
 *
 * Copyright (c) 2012       Flemming Madsen <flemming!madsen()madsensoft!dk>
- * Copyright (c) 2013-2015  Joachim Nilsson <troglobit()gmail!com>
+ * Copyright (c) 2013-2017  Joachim Nilsson <troglobit()gmail!com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
@@ -67,17 +67,23 @@ int uev_timer_init(uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, int timeou
 {
 	int fd;

-	fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
+	if (timeout < 0 || period < 0) {
+		errno = ERANGE;
+		return -1;
+	}
+
+	fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC);
 	if (fd < 0)
 		return -1;

-	if (uev_watcher_init(ctx, w, UEV_TIMER_TYPE, cb, arg, fd, UEV_READ))
+	if (_uev_watcher_init(ctx, w, UEV_TIMER_TYPE, cb, arg, fd, UEV_READ))
 		goto exit;

 	if (uev_timer_set(w, timeout, period)) {
-		uev_watcher_stop(w);
+		_uev_watcher_stop(w);
 	exit:
 		close(fd);
+		w->fd = -1;
 		return -1;
 	}

@@ -100,6 +106,11 @@ int uev_timer_set(uev_t *w, int timeout, int period)
 		return -1;
 	}

+	if (timeout < 0 || period < 0) {
+		errno = ERANGE;
+		return -1;
+	}
+
 	/* Handle stopped timers */
 	if (w->fd < 0) {
 		/* Timer already stopped */
@@ -113,18 +124,19 @@ int uev_timer_set(uev_t *w, int timeout, int period)
 			return -1;
 	}

-	w->timeout = timeout;
-	w->period  = period;
+	w->u.t.timeout = timeout;
+	w->u.t.period  = period;

 	if (w->ctx->running) {
 		struct itimerspec time;

 		msec2tspec(timeout, &time.it_value);
 		msec2tspec(period, &time.it_interval);
-		timerfd_settime(w->fd, 0, &time, NULL);
+		if (timerfd_settime(w->fd, 0, &time, NULL) < 0)
+			return 1;
 	}

-	return uev_watcher_start(w);
+	return _uev_watcher_start(w);
 }

 /**
@@ -141,9 +153,9 @@ int uev_timer_start(uev_t *w)
 	}

 	if (-1 != w->fd)
-		uev_watcher_stop(w);
+		_uev_watcher_stop(w);

-	return uev_timer_set(w, w->timeout, w->period);
+	return uev_timer_set(w, w->u.t.timeout, w->u.t.period);
 }

 /**
@@ -154,10 +166,14 @@ int uev_timer_start(uev_t *w)
 */
 int uev_timer_stop(uev_t *w)
 {
+	/* Check if already stopped in uev_run() after cb() or _init() */
+	if (!_uev_watcher_active(w))
+		return 0;
+
 	/* Stop kernel timer */
 	uev_timer_set(w, 0, 0);

-	if (uev_watcher_stop(w))
+	if (_uev_watcher_stop(w))
 		return -1;

 	/* Close timerfd, will have to be reopened again on reset */
@@ -169,7 +185,6 @@ int uev_timer_stop(uev_t *w)

 /**
 * Local Variables:
- *  version-control: t
 *  indent-tabs-mode: t
 *  c-file-style: "linux"
 * End:
@@ -1,7 +1,7 @@
 /* libuEv - Micro event loop library
 *
 * Copyright (c) 2012       Flemming Madsen <flemming!madsen()madsensoft!dk>
- * Copyright (c) 2013-2015  Joachim Nilsson <troglobit()gmail!com>
+ * Copyright (c) 2013-2017  Joachim Nilsson <troglobit()gmail!com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
@@ -26,6 +26,8 @@
 #include <fcntl.h>		/* O_CLOEXEC */
 #include <string.h>		/* memset() */
 #include <sys/epoll.h>
+#include <sys/ioctl.h>
+#include <sys/select.h>		/* for select() workaround */
 #include <sys/signalfd.h>	/* struct signalfd_siginfo */
 #include <unistd.h>		/* close(), read() */

@@ -36,8 +38,9 @@

 static int _init(uev_ctx_t *ctx, int close_old)
 {
-	int fd = epoll_create1(EPOLL_CLOEXEC);
+	int fd;

+	fd = epoll_create1(EPOLL_CLOEXEC);
 	if (fd < 0)
 		return -1;

@@ -49,14 +52,24 @@ static int _init(uev_ctx_t *ctx, int close_old)
 	return 0;
 }

-/* Simple check if a descriptor is still valid in the kernel */
-static int is_valid_fd(int fd)
+/* Used by file i/o workaround when epoll => EPERM */
+static int has_data(int fd)
 {
-    return fcntl(fd, F_GETFL) != -1 || errno != EBADF;
+	struct timeval timeout = { 0, 0 };
+	fd_set fds;
+	int n = 0;
+
+	FD_ZERO(&fds);
+	FD_SET(fd, &fds);
+
+	if (select(1, &fds, NULL, NULL, &timeout) > 0)
+		return ioctl(0, FIONREAD, &n) == 0 && n > 0;
+
+	return 0;
 }

 /* Private to libuEv, do not use directly! */
-int uev_watcher_init(uev_ctx_t *ctx, uev_t *w, uev_type_t type, uev_cb_t *cb, void *arg, int fd, int events)
+int _uev_watcher_init(uev_ctx_t *ctx, uev_t *w, uev_type_t type, uev_cb_t *cb, void *arg, int fd, int events)
 {
 	if (!ctx || !w) {
 		errno = EINVAL;
@@ -67,7 +80,7 @@ int uev_watcher_init(uev_ctx_t *ctx, uev_t *w, uev_type_t type, uev_cb_t *cb, vo
 	w->type   = type;
 	w->active = 0;
 	w->fd     = fd;
-	w->cb     = (void *)cb;
+	w->cb     = cb;
 	w->arg    = arg;
 	w->events = events;

@@ -75,7 +88,7 @@ int uev_watcher_init(uev_ctx_t *ctx, uev_t *w, uev_type_t type, uev_cb_t *cb, vo
 }

 /* Private to libuEv, do not use directly! */
-int uev_watcher_start(uev_t *w)
+int _uev_watcher_start(uev_t *w)
 {
 	struct epoll_event ev;

@@ -84,15 +97,28 @@ int uev_watcher_start(uev_t *w)
 		return -1;
 	}

-	if (w->active)
+	if (_uev_watcher_active(w))
 		return 0;

 	ev.events   = w->events | EPOLLRDHUP;
 	ev.data.ptr = w;
-	if (epoll_ctl(w->ctx->fd, EPOLL_CTL_ADD, w->fd, &ev) < 0)
-		return -1;
+	if (epoll_ctl(w->ctx->fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) {
+		if (errno != EPERM)
+			return -1;

-	w->active = 1;
+		/* Handle special case: `application < file.txt` */
+		if (w->type != UEV_IO_TYPE || w->events != UEV_READ)
+			return -1;
+
+		/* Only allow this special handling for stdin */
+		if (w->fd != STDIN_FILENO)
+			return -1;
+
+		w->ctx->workaround = 1;
+		w->active = -1;
+	} else {
+		w->active = 1;
+	}

 	/* Add to internal list for bookkeeping */
 	LIST_INSERT_HEAD(&w->ctx->watchers, w, link);
@@ -101,14 +127,14 @@ int uev_watcher_start(uev_t *w)
 }

 /* Private to libuEv, do not use directly! */
-int uev_watcher_stop(uev_t *w)
+int _uev_watcher_stop(uev_t *w)
 {
 	if (!w) {
 		errno = EINVAL;
 		return -1;
 	}

-	if (!w->active)
+	if (!_uev_watcher_active(w))
 		return 0;

 	w->active = 0;
@@ -123,6 +149,33 @@ int uev_watcher_stop(uev_t *w)
 	return 0;
 }

+/* Private to libuEv, do not use directly! */
+int _uev_watcher_active(uev_t *w)
+{
+	if (!w)
+		return 0;
+
+	return w->active > 0;
+}
+
+/* Private to libuEv, do not use directly! */
+int _uev_watcher_rearm(uev_t *w)
+{
+	struct epoll_event ev;
+
+	if (!w || w->fd < 0) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	ev.events   = w->events | EPOLLRDHUP;
+	ev.data.ptr = w;
+	if (epoll_ctl(w->ctx->fd, EPOLL_CTL_MOD, w->fd, &ev) < 0)
+		return -1;
+
+	return 0;
+}
+
 /**
 * Create an event loop context
 * @param ctx  Pointer to an uev_ctx_t context to be initialized
@@ -161,10 +214,11 @@ int uev_exit(uev_ctx_t *ctx)
 		/* Remove from internal list */
 		LIST_REMOVE(w, link);

-		if (!w->active)
+		if (!_uev_watcher_active(w))
 			continue;

 		switch (w->type) {
+		case UEV_CRON_TYPE:
 		case UEV_TIMER_TYPE:
 			uev_timer_stop(w);
 			break;
@@ -202,7 +256,7 @@ int uev_exit(uev_ctx_t *ctx)
 */
 int uev_run(uev_ctx_t *ctx, int flags)
 {
-	int result = 0, timeout = -1;
+	int timeout = -1;
 	uev_t *w;

        if (!ctx || ctx->fd < 0) {
@@ -218,15 +272,37 @@ int uev_run(uev_ctx_t *ctx, int flags)

 	/* Start all dormant timers */
 	LIST_FOREACH(w, &ctx->watchers, link) {
+		if (UEV_CRON_TYPE == w->type)
+			uev_cron_set(w, w->u.c.when, w->u.c.interval);
 		if (UEV_TIMER_TYPE == w->type)
-			uev_timer_set(w, w->timeout, w->period);
+			uev_timer_set(w, w->u.t.timeout, w->u.t.period);
 	}

-	while (ctx->running) {
-		int i, nfds;
-		struct epoll_event events[UEV_MAX_EVENTS];
+	while (ctx->running && !LIST_EMPTY(&ctx->watchers)) {
+		int i, nfds, rerun = 0;
+		struct epoll_event ee[UEV_MAX_EVENTS];

-		while ((nfds = epoll_wait(ctx->fd, events, UEV_MAX_EVENTS, timeout)) < 0) {
+		/* Handle special case: `application < file.txt` */
+		if (ctx->workaround) {
+			LIST_FOREACH(w, &ctx->watchers, link) {
+				if (w->active != -1 || !w->cb)
+					continue;
+
+				if (!has_data(w->fd)) {
+					w->active = 0;
+					LIST_REMOVE(w, link);
+				}
+
+				rerun++;
+				w->cb(w, w->arg, UEV_READ);
+			}
+		}
+
+		if (rerun)
+			continue;
+		ctx->workaround = 0;
+
+		while ((nfds = epoll_wait(ctx->fd, ee, UEV_MAX_EVENTS, timeout)) < 0) {
 			if (!ctx->running)
 				break;

@@ -235,86 +311,82 @@ int uev_run(uev_ctx_t *ctx, int flags)

 			/* Unrecoverable error, cleanup and exit with error. */
 			uev_exit(ctx);
-			return -1;
+
+			return -2;
 		}

 		for (i = 0; ctx->running && i < nfds; i++) {
-			w = (uev_t *)events[i].data.ptr;
+			uint64_t exp;
+			uint32_t events;
+			struct signalfd_siginfo fdsi;
+			ssize_t sz = sizeof(fdsi);

-			if (events[i].events & (EPOLLHUP | EPOLLERR)) {
-				ctx->errors++;
+			w = (uev_t *)ee[i].data.ptr;
+			events = ee[i].events;

-				if (ctx->errors >= 42) {
-					uev_t *tmp, *retry = w;;
-
-					/* If not valid anymore, try to remove, ignore any errors. */
-					if (!is_valid_fd(w->fd))
-						uev_watcher_stop(w);
-
-					/* Must recreate epoll fd now ... */
-					if (_init(ctx, 1)) {
-						uev_exit(ctx);
-						return -2;
-					}
-
-					/* Restart watchers in new efd */
-					LIST_FOREACH_SAFE(w, &ctx->watchers, link, tmp) {
-						if (w->active) {
-							w->active = 0;
-							LIST_REMOVE(w, link);
-							uev_watcher_start(w);
-						}
-					}
-					uev_watcher_start(retry);
-
-					/* New efd, restart everything! */
-					ctx->errors = 0;
-					continue;
-				}
-			}
-
-			if (UEV_TIMER_TYPE == w->type) {
-				uint64_t exp;
-
-				if (read(w->fd, &exp, sizeof(exp)) != sizeof(exp)) {
-					uev_exit(ctx);
-					return -3;
-				}
-
-				if (!w->period)
-					w->timeout = 0;
-			}
-
-			if (UEV_SIGNAL_TYPE == w->type) {
-				struct signalfd_siginfo fdsi;
-				ssize_t sz = sizeof(fdsi);
+			switch (w->type) {
+			case UEV_IO_TYPE:
+				if (events & (EPOLLHUP | EPOLLERR))
+					uev_io_stop(w);
+				break;

+			case UEV_SIGNAL_TYPE:
 				if (read(w->fd, &fdsi, sz) != sz) {
-					uev_exit(ctx);
-					return -4;
+					if (uev_signal_start(w)) {
+						uev_signal_stop(w);
+						events = UEV_ERROR;
+					}
 				}
+				break;
+
+			case UEV_TIMER_TYPE:
+				if (read(w->fd, &exp, sizeof(exp)) != sizeof(exp)) {
+					uev_timer_stop(w);
+					events = UEV_ERROR;
+				}
+
+				if (!w->u.t.period)
+					w->u.t.timeout = 0;
+				break;
+
+			case UEV_CRON_TYPE:
+				if (read(w->fd, &exp, sizeof(exp)) != sizeof(exp)) {
+					events = UEV_HUP;
+					if (errno != ECANCELED) {
+						uev_cron_stop(w);
+						events = UEV_ERROR;
+					}
+				}
+
+				if (!w->u.c.interval)
+					w->u.c.when = 0;
+				else
+					w->u.c.when += w->u.c.interval;
+				break;
 			}

 			if (w->cb)
-				w->cb(w, w->arg, events[i].events & UEV_EVENT_MASK);
+				w->cb(w, w->arg, events & UEV_EVENT_MASK);

+			if (UEV_CRON_TYPE == w->type) {
+				if (!w->u.c.when)
+					uev_timer_stop(w);
+			}
 			if (UEV_TIMER_TYPE == w->type) {
-				if (!w->timeout)
+				if (!w->u.t.timeout)
 					uev_timer_stop(w);
 			}
 		}

-		if ((flags & UEV_ONCE) || LIST_EMPTY(&ctx->watchers))
+		if (flags & UEV_ONCE)
 			break;
 	}

-	return result;
+	return 0;
 }

-
 /**
 * Local Variables:
- *  version-control: t
 *  indent-tabs-mode: t
 *  c-file-style: "linux"
 * End:
@@ -30,26 +30,48 @@
 /* Max. number of simulateneous events */
 #define UEV_MAX_EVENTS  10

-/* I/O events, for signals and timers revents will always be UEV_READ */
+/* I/O events, signal and timer revents are always UEV_READ */
 #define UEV_NONE        0
+#define UEV_ERROR       EPOLLERR
 #define UEV_READ        EPOLLIN
 #define UEV_WRITE       EPOLLOUT
+#define UEV_PRI         EPOLLPRI
+#define UEV_HUP         EPOLLHUP
+#define UEV_RDHUP       EPOLLRDHUP
+#define UEV_EDGE        EPOLLET
+#define UEV_ONESHOT     EPOLLONESHOT

 /* Run flags */
 #define UEV_ONCE        1
 #define UEV_NONBLOCK    2

+/* Macros */
+#define uev_io_active(w)     _uev_watcher_active(w)
+#define uev_timer_active(w)  _uev_watcher_active(w)
+#define uev_cron_active(w)   _uev_watcher_active(w)
+#define uev_signal_active(w) _uev_watcher_active(w)
+
 /* Event watcher */
 typedef struct uev {
 	/* Private data for libuEv internal engine */
 	uev_private_t   type;

 	/* Public data for users to reference  */
+	int             signo;
 	int             fd;
 	uev_ctx_t      *ctx;
 } uev_t;

-/* Generic callback for watchers */
+/*
+ * Generic callback for watchers, @events holds %UEV_READ and/or %UEV_WRITE
+ * with optional %UEV_PRI (priority data available to read) and any of the
+ * %UEV_HUP and/or %UEV_RDHUP, which may be used to signal hang-up events.
+ *
+ * Note: UEV_ERROR conditions must be handled by all callbacks!
+ *       I/O watchers may also need to check UEV_HUP.  Appropriate action,
+ *       e.g. restart the watcher, is up to the application and is thus
+ *       delegated to the callback.
+ */
 typedef void (uev_cb_t)(uev_t *w, void *arg, int events);

 /* Public interface */
@@ -67,6 +89,11 @@ int uev_timer_set      (uev_t *w, int timeout, int period);
 int uev_timer_start    (uev_t *w);
 int uev_timer_stop     (uev_t *w);

+int uev_cron_init      (uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, time_t when, time_t interval);
+int uev_cron_set       (uev_t *w, time_t when, time_t interval);
+int uev_cron_start     (uev_t *w);
+int uev_cron_stop      (uev_t *w);
+
 int uev_signal_init    (uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, int signo);
 int uev_signal_set     (uev_t *w, int signo);
 int uev_signal_start   (uev_t *w);
@@ -76,7 +103,6 @@ int uev_signal_stop    (uev_t *w);

 /**
 * Local Variables:
- *  version-control: t
 *  indent-tabs-mode: t
 *  c-file-style: "linux"
 * End:
@@ -0,0 +1,7 @@
+*.trs
+*.log
+active
+complete
+cronrun
+signal
+timer
@@ -0,0 +1,16 @@
+EXTRA_DIST      = check.h
+CLEANFILES      = *~ *.trs *.log
+
+TESTS           =
+TESTS          += active
+TESTS          += complete
+TESTS          += cronrun
+TESTS          += signal
+TESTS          += timer
+
+check_PROGRAMS  = $(TESTS)
+
+# Ignore warnings about unused result, in e.g. write()
+CFLAGS          = -W -Wall -Wextra -Wno-unused-result
+CPPFLAGS        = -D_GNU_SOURCE
+LDADD           = -L../src ../src/libuev.la
@@ -0,0 +1,54 @@
+#include "check.h"
+#include <time.h>
+#include <sys/time.h>
+
+#define TIMEOUT1 2		/* 2 sec */
+#define TIMEOUT2 4		/* 4 sec */
+#define DAYLY    (24 * 60 * 60)	/* Seconds in one day */
+
+uev_t timer1;
+uev_t timer2;
+uev_t timer3;
+uev_t cron1;
+uev_t cron2;
+
+static void cb(uev_t *w, void *UNUSED(arg), int events)
+{
+	if (UEV_ERROR == events)
+		fprintf(stderr, "timer watcher failed, ignoring ...\n");
+
+	fail_unless(w == &timer1);
+
+	fail_unless(uev_timer_active(&timer2));
+	fail_unless(!uev_timer_active(&timer3));
+	fail_unless(uev_cron_active(&cron1));
+	fail_unless(uev_cron_active(&cron2));
+
+	uev_timer_stop(&timer2);
+	uev_timer_stop(&cron2);
+
+	fail_unless(!uev_timer_active(&timer2));
+	fail_unless(!uev_cron_active(&cron2));
+
+	uev_exit(w->ctx);
+}
+
+int main(void)
+{
+	uev_ctx_t ctx;
+	struct timeval tomorrow;
+
+	gettimeofday(&tomorrow, NULL);
+	tomorrow.tv_sec += 24 * 60 * 60;
+
+	uev_init(&ctx);
+	uev_timer_init(&ctx, &timer1, cb, NULL, TIMEOUT1 * 1000, 0);
+	uev_timer_init(&ctx, &timer2, cb, NULL, TIMEOUT2 * 1000, 0);
+	uev_timer_init(&ctx, &timer3, cb, NULL, TIMEOUT2 * 1000, 0);
+	uev_timer_stop(&timer3);
+
+	uev_cron_init(&ctx, &cron1, cb, NULL, tomorrow.tv_sec, 24 * 60 * 60);
+	uev_cron_init(&ctx, &cron2, cb, NULL, tomorrow.tv_sec, 24 * 60 * 60);
+
+	return uev_run(&ctx, 0);
+}
@@ -0,0 +1,81 @@
+#ifndef UEV_TESTS_CHECK_H_
+#define UEV_TESTS_CHECK_H_
+
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "../src/uev.h"
+
+#define UNUSED(arg) arg __attribute__ ((unused))
+
+#define fail_unless(test)						\
+  do {									\
+    if (!(test)) {							\
+      fprintf(stderr,							\
+	      "----------------------------------------------\n"	\
+	      "%s:%d: test FAILED:\nFailed test: %s\n"			\
+	      "----------------------------------------------\n",	\
+	      __FILE__, __LINE__, #test);				\
+      exit(1);								\
+    }									\
+  } while (0)
+
+static inline int test(int result, const char *fmt, ...)
+{
+	char buf[80];
+	size_t len;
+	va_list ap;
+	const char success[] = " \033[1m[ OK ]\033[0m\n";
+	const char failure[] = " \033[7m[FAIL]\033[0m\n";
+	const char dots[] = " .....................................................................";
+
+	va_start(ap, fmt);
+	len = vsnprintf(buf, sizeof(buf), fmt, ap);
+	va_end(ap);
+
+	write(STDERR_FILENO, buf, len);
+	write(STDERR_FILENO, dots, 60 - len); /* pad with dots. */
+
+	if (!result)
+		write(STDERR_FILENO, success, strlen(success));
+	else
+		write(STDERR_FILENO, failure, strlen(failure));
+
+	return result;
+}
+
+static inline int timespec_newer(const struct timespec *a, const struct timespec *b)
+{
+	if (a->tv_sec != b->tv_sec)
+		return a->tv_sec > b->tv_sec;
+
+	return a->tv_nsec > b->tv_nsec;
+}
+
+static inline char *timespec2str(struct timespec *ts, char *buf, size_t len)
+{
+	size_t ret, pos;
+	struct tm t;
+
+	memset(buf, 0, len);
+
+	tzset();
+	if (localtime_r(&(ts->tv_sec), &t) == NULL)
+		return buf;
+
+	ret = strftime(buf, len, "%F %T", &t);
+	if (ret == 0)
+		return buf;
+	len -= ret - 1;
+
+	pos  = strlen(buf);
+	len -= pos;
+	snprintf(&buf[pos], len, ".%09ld", ts->tv_nsec);
+
+	return buf;
+}
+
+#endif /* UEV_TESTS_CHECK_H_ */
@@ -22,14 +22,8 @@
 * THE SOFTWARE.
 */

+#include "check.h"
 #include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>		/* intptr_t */
-
-#include "uev.h"
-
-#define UNUSED(arg) arg __attribute__ ((unused))

 typedef struct {
 	int counter;
@@ -39,15 +33,21 @@ static int in, out;
 static int period = 0;
 static uev_t *watchdog;

-static void lifetime_cb(uev_t *w, void *arg, int UNUSED(events))
+static void lifetime_cb(uev_t *w, void *arg, int events)
 {
+	if (UEV_ERROR == events)
+		fprintf(stderr, "timer watcher failed, ignoring ...\n");
+
 	fprintf(stderr, "\nLifetime exceeded, program completed successfully! (arg:%p)\n", arg);
 	uev_exit(w->ctx);
 }

 /* The pipe watchdog, if it triggers we haven't received data in time. */
-static void timeout_cb(uev_t *w, void *arg, int UNUSED(events))
+static void timeout_cb(uev_t *w, void *arg, int events)
 {
+	if (UEV_ERROR == events)
+		fprintf(stderr, "timer watcher failed, ignoring ...\n");
+
 	watchdog = NULL;
 	fprintf(stderr, "\nTimeout exceeded %p\n", arg);

@@ -60,23 +60,46 @@ static void periodic_task(uev_t UNUSED(*w), void UNUSED(*arg), int UNUSED(events
 	fprintf(stderr, "|");
 }

-static void signal_cb(uev_t *w, void *UNUSED(arg), int UNUSED(events))
+static void signal_cb(uev_t *w, void *UNUSED(arg), int events)
 {
+	if (UEV_ERROR == events) {
+		fprintf(stderr, "Signal watcher failed, unrecoverable error.\n");
+		return;
+	}
+
 	fprintf(stderr, w->signo == SIGINT ? "^Cv" : "^\v");
 }

-static void pipe_read_cb(uev_t UNUSED(*w), void UNUSED(*arg), int UNUSED(events))
+static void pipe_read_cb(uev_t *w, void UNUSED(*arg), int events)
 {
-	int cnt;
+	int len;
 	char msg[50];

+	if (UEV_ERROR == events) {
+	error:
+		fprintf(stderr, "pipe watcher failed, restarting ...\n");
+		uev_io_start(w);
+		return;
+	}
+
        /* Kick watchdog */
 	if (watchdog)
 		uev_timer_set(watchdog, 1000, 0);

-	cnt = read(in, msg, sizeof(msg));
-//	fprintf(stderr, "READ %.*s %d\n", cnt, msg, cnt);
-	fprintf(stderr, "%.*s.%d ", cnt, msg, cnt);
+	/* Here we can read() from in or w->fd, either works. */
+	len = read(w->fd, msg, sizeof(msg));
+	if (len < 0) {
+		perror(__func__);
+		goto error;
+	}
+
+	if (len == 0 || UEV_HUP == events) {
+		fprintf(stderr, "Other end of pipe closed, no more data\n");
+		return;
+	}
+
+//	fprintf(stderr, "READ %.*s %d\n", len, msg, len);
+	fprintf(stderr, "%.*s.%d ", len, msg, len);
 }

 static void pipe_write_cb(uev_t *w, void *arg, int UNUSED(events))
@@ -84,6 +107,10 @@ static void pipe_write_cb(uev_t *w, void *arg, int UNUSED(events))
 	my_t *my  = arg;
 	char *msg = "TESTING";

+	if (UEV_ERROR == events)
+		fprintf(stderr, "timer watcher failed, ignoring ...\n");
+
+	/* Here we *must* use out, not w->fd, since we're a timer callback */
 	if (write(out, msg, my->counter) < 0) {
                perror("\nFailed writing to pipe");
                return;
@@ -138,15 +165,13 @@ int main(void)
 	uev_run(&ctx, 0);

 	fprintf(stderr, "Period is %d must be 10: %s\n", period, 10 == period ? "OK" : "ERROR!");
-	if (10 != period)
-		return 1;
+	fail_unless(10 == period);

 	return 0;
 }

 /**
 * Local Variables:
- *  version-control: t
 *  indent-tabs-mode: t
 *  c-file-style: "linux"
 * End:
@@ -0,0 +1,77 @@
+/* Test cron API in libuEv event library
+ *
+ * Copyright (c) 2016  Joachim Nilsson <troglobit()gmail!com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "check.h"
+#include <time.h>
+#include <sys/time.h>
+
+#define TIMEOUT  2
+#define INTERVAL 2
+
+struct timeval tv;
+
+static void cron_job(uev_t *w, void *UNUSED(arg), int events)
+{
+	static int laps = 3;
+	struct timeval now;
+
+	if (UEV_ERROR == events)
+		fprintf(stderr, "cron watcher failed, ignoring ...\n");
+
+	/* Update timer every lap */
+	tv.tv_sec += TIMEOUT;
+
+	gettimeofday(&now, NULL);
+	printf("Cron job HELO %s", ctime(&now.tv_sec));
+	fail_unless(now.tv_sec == tv.tv_sec);
+
+	if (!laps--)
+		uev_exit(w->ctx);
+}
+
+int main(void)
+{
+	uev_t cron_watcher;
+	uev_ctx_t ctx;
+	time_t when, interval;
+
+	uev_init(&ctx);
+
+	gettimeofday(&tv, NULL);
+	when = tv.tv_sec + TIMEOUT;
+
+	printf("Start of test %s", ctime(&tv.tv_sec));
+	printf("Expected cron %s", ctime(&when));
+	
+	interval = INTERVAL;
+	uev_cron_init(&ctx, &cron_watcher, cron_job, NULL, when, interval);
+
+	return uev_run(&ctx, 0);
+}
+
+/**
+ * Local Variables:
+ *  indent-tabs-mode: t
+ *  c-file-style: "linux"
+ * End:
+ */
@@ -21,7 +21,7 @@
 * THE SOFTWARE.
 */

-#define _GNU_SOURCE
+#include "check.h"
 #include <err.h>
 #include <sched.h>
 #include <signal.h>
@@ -33,8 +33,6 @@
 #include <sys/wait.h>
 #include <unistd.h>

-#include "uev.h"
-
 #define UNUSED(arg) arg __attribute__ ((unused))
 #define DO_SEGFAULT 1

@@ -134,7 +132,6 @@ int main(void)

 /**
 * Local Variables:
- *  version-control: t
 *  indent-tabs-mode: t
 *  c-file-style: "linux"
 * End:
@@ -0,0 +1,31 @@
+#include "check.h"
+#include <time.h>
+#include <sys/time.h>
+
+#define TIMEOUT 2		/* 2 sec */
+struct timeval start;
+
+static void cb(uev_t *w, void *UNUSED(arg), int events)
+{
+	struct timeval now;
+
+	if (UEV_ERROR == events)
+		fprintf(stderr, "timer watcher failed, ignoring ...\n");
+
+	gettimeofday(&now, NULL);
+	fail_unless(now.tv_sec == start.tv_sec + TIMEOUT);
+
+	uev_exit(w->ctx);
+}
+
+int main(void)
+{
+	uev_t w;
+	uev_ctx_t ctx;
+
+	uev_init(&ctx);
+	uev_timer_init(&ctx, &w, cb, NULL, TIMEOUT * 1000, 0);
+	gettimeofday(&start, NULL);
+
+	return uev_run(&ctx, 0);
+}