libuev
2.4.1
src
signal.c
Go to the documentation of this file.
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/* 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) 2013-2024 Joachim Wiberg <troglobit()gmail!com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* 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, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* 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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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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sigset_t mask;
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int
fd;
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if
(!w || !ctx) {
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errno = EINVAL;
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return
-1;
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}
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w->
fd
= -1;
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sigemptyset(&mask);
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fd = signalfd(-1, &mask, SFD_NONBLOCK | SFD_CLOEXEC);
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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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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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/* Remember for callbacks and start/stop */
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w->
signo
= signo;
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/* Handle stopped signal watchers */
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if
(w->
fd
< 0) {
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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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int
uev_signal_start
(
uev_t
*w)
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{
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if
(!w) {
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errno = EINVAL;
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return
-1;
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}
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if
(-1 != w->
fd
)
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uev_signal_stop
(w);
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return
uev_signal_set
(w, w->
signo
);
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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_active(w))
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return
0;
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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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uev_signal_stop
int uev_signal_stop(uev_t *w)
Definition
signal.c:147
uev_signal_start
int uev_signal_start(uev_t *w)
Definition
signal.c:128
uev_signal_set
int uev_signal_set(uev_t *w, int signo)
Definition
signal.c:88
uev_signal_init
int uev_signal_init(uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, int signo)
Definition
signal.c:52
uev::signo
int signo
Definition
uev.h:78
uev::fd
int fd
Definition
uev.h:79
uev::ctx
uev_ctx_t * ctx
Definition
uev.h:80
uev.h
uev_ctx_t
struct uev_ctx uev_ctx_t
Definition
uev.h:70
UEV_READ
#define UEV_READ
Definition
uev.h:46
uev_cb_t
void uev_cb_t(uev_t *w, void *arg, int events)
Definition
uev.h:97
uev_t
struct uev uev_t
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