mirror of
https://github.com/troglobit/libuev.git
synced 2026-10-14 10:09:31 +00:00
131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
/* libuev - Micro event loop library
|
|
*
|
|
* Copyright (c) 2012 Flemming Madsen <flemming!madsen()madsensoft!dk>
|
|
* Copyright (c) 2013 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 <signal.h>
|
|
#include <sys/signalfd.h>
|
|
#include <unistd.h> /* close(), read() */
|
|
|
|
#include "uev.h"
|
|
|
|
|
|
/**
|
|
* Create a signal watcher
|
|
* @param ctx A valid libuev context
|
|
* @param handler Timer callback
|
|
* @param data Optional callback argument
|
|
* @param signo Signal to watch for
|
|
*
|
|
* @return The new watcher, or %NULL with @param errno set on error.
|
|
*/
|
|
uev_watcher_t *uev_signal_create(uev_t *ctx, uev_cb_t *handler, void *data, int signo)
|
|
{
|
|
int fd;
|
|
sigset_t mask;
|
|
uev_watcher_t *w;
|
|
|
|
sigemptyset(&mask);
|
|
fd = signalfd(-1, &mask, SFD_NONBLOCK);
|
|
if (fd < 0)
|
|
return NULL;
|
|
|
|
w = uev_watcher_create(ctx, UEV_SIGNAL_TYPE, fd, UEV_DIR_INBOUND, handler, data);
|
|
if (!w)
|
|
goto exit;
|
|
|
|
if (uev_signal_set(ctx, w, signo)) {
|
|
uev_watcher_delete(ctx, w);
|
|
exit:
|
|
close(fd);
|
|
return NULL;
|
|
}
|
|
|
|
return w;
|
|
}
|
|
|
|
/**
|
|
* Reset a signal watcher
|
|
* @param ctx A valid libuev context
|
|
* @param w Watcher to reset
|
|
* @param signo New signal to watch for
|
|
*
|
|
* @return POSIX OK(0) or non-zero with @param errno set.
|
|
*/
|
|
int uev_signal_set(uev_t *ctx, uev_watcher_t *w, int signo)
|
|
{
|
|
sigset_t mask;
|
|
|
|
if (!ctx || !w) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
sigemptyset(&mask);
|
|
sigaddset(&mask, signo);
|
|
|
|
/* Block signals so that they aren't handled
|
|
according to their default dispositions */
|
|
|
|
if (sigprocmask(SIG_BLOCK, &mask, NULL) == -1)
|
|
return -1;
|
|
|
|
if (signalfd(w->fd, &mask, SFD_NONBLOCK) < 0)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Delete a signal watcher
|
|
* @param ctx A valid libuev context
|
|
* @param w Watcher to delete
|
|
*
|
|
* @return POSIX OK(0) or non-zero with @param errno set.
|
|
*/
|
|
int uev_signal_delete(uev_t *ctx, uev_watcher_t *w)
|
|
{
|
|
int fd;
|
|
|
|
if (!ctx || !w) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
uev_timer_set(ctx, w, 0, 0);
|
|
fd = w->fd;
|
|
uev_watcher_delete(ctx, w);
|
|
close(fd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Local Variables:
|
|
* version-control: t
|
|
* indent-tabs-mode: t
|
|
* c-file-style: "linux"
|
|
* End:
|
|
*/
|