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112 lines
2.7 KiB
C
112 lines
2.7 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) 2013-2024 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 <sys/eventfd.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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* Linux [eventfd(2)](https://man7.org/linux/man-pages/man2/eventfd.2.html).
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* @file event.c
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*/
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/**
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* Create a generic event 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 Callback when an event is posted
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* @param arg Optional callback argument
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*
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* @return POSIX OK(0) or non-zero with @p errno set on error.
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*/
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int uev_event_init(uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg)
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{
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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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fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
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if (fd < 0)
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return -1;
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return _uev_watcher_init(ctx, w, UEV_EVENT_TYPE, cb, arg, fd, UEV_READ)
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|| _uev_watcher_start(w);
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}
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/**
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* Post a generic event
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* @param w Watcher to post to
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*
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* @return POSIX OK(0) or non-zero with @p errno set on error.
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*/
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int uev_event_post(uev_t *w)
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{
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uint64_t val = 1;
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if (!w || -1 == w->fd) {
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errno = EINVAL;
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return -1;
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}
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if (write(w->fd, &val, sizeof(val)) != sizeof(val))
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return -1;
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return 0;
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}
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/**
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* Stop a generic event 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 @p errno set on error.
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*/
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int uev_event_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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/**
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* Local Variables:
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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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