mirror of
https://github.com/troglobit/libuev.git
synced 2026-10-09 16:50:26 +07:00
Joachim Nilsson
d6e0146803
- Rename all _create() functions --> _init() - Rename all _delete() functions --> _stop() - Watchers are automatically started, except - Timer watchers are automatically started by uev_run() - Allow I/O watchers to watch either EV_READ/EV_WRITE or both events - Extend callbacks with a received events field - Remove calloc()/free(), let user handle this - Make event has-a context when initializing it => simplifies API - Internal uev_watcher_*() API mostly handles epoll stop/start Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
131 lines
3.2 KiB
C
131 lines
3.2 KiB
C
/* libuev - Micro event loop library
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*
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* Copyright (c) 2012 Flemming Madsen <flemming!madsen()madsensoft!dk>
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* Copyright (c) 2013 Joachim Nilsson <troglobit()gmail!com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <errno.h>
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#include <signal.h>
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#include <sys/signalfd.h>
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#include <unistd.h> /* close(), read() */
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#include "uev.h"
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/**
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* Create a signal watcher
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* @param ctx A valid libuev context
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* @param w Pointer to an uev_t watcher
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* @param cb Timer callback
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* @param arg Optional callback argument
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* @param signo Signal to watch for
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*
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* @return POSIX OK(0) or non-zero with @param errno set on error.
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*/
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int uev_signal_init(uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, int signo)
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{
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int fd;
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sigset_t mask;
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sigemptyset(&mask);
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fd = signalfd(-1, &mask, SFD_NONBLOCK);
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if (fd < 0)
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return -1;
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if (uev_watcher_init(ctx, w, UEV_SIGNAL_TYPE, cb, arg, fd, UEV_READ))
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goto exit;
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if (uev_signal_set(w, signo)) {
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uev_watcher_stop(w);
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exit:
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close(fd);
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return -1;
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}
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return 0;
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}
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/**
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* Reset a signal watcher
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* @param w Watcher to reset
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* @param signo New signal to watch for
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*
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* @return POSIX OK(0) or non-zero with @param errno set on error.
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*/
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int uev_signal_set(uev_t *w, int signo)
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{
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sigset_t mask;
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/* Every watcher must be registered to a context */
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if (!w || !w->ctx) {
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errno = EINVAL;
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return -1;
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}
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/* Handle stopped signal watchers */
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if (w->fd < 0) {
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/* Remove from internal list */
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LIST_REMOVE(w, link);
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if (uev_signal_init(w->ctx, w, (uev_cb_t *)w->cb, w->arg, signo))
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return -1;
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}
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sigemptyset(&mask);
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sigaddset(&mask, signo);
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/* Block signals so that they aren't handled
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according to their default dispositions */
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if (sigprocmask(SIG_BLOCK, &mask, NULL) == -1)
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return -1;
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if (signalfd(w->fd, &mask, SFD_NONBLOCK) < 0)
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return -1;
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return uev_watcher_start(w);
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}
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/**
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* Stop a signal watcher
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* @param w Watcher to stop
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*
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* @return POSIX OK(0) or non-zero with @param errno set on error.
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*/
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int uev_signal_stop(uev_t *w)
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{
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if (uev_watcher_stop(w))
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return -1;
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close(w->fd);
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w->fd = -1;
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return 0;
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}
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/**
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* Local Variables:
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* version-control: t
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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