/* 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 "uev.h"


/**
 * Create an I/O watcher
 * @param ctx     A valid libuev context
 * @param w       Pointer to an uev_t watcher
 * @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
 *
 * @return POSIX OK(0) or non-zero with @param errno set on error.
 */
int uev_io_init(uev_ctx_t *ctx, uev_t *w, uev_cb_t *cb, void *arg, int fd, int events)
{
	if (uev_watcher_init(ctx, w, UEV_IO_TYPE, cb, arg, fd, events))
		return -1;

	if (fd < 0)
		return 0;

	return uev_watcher_start(w);
}

/**
 * Reset an I/O watcher
 * @param w       Pointer to an uev_t watcher
 * @param fd      New file descriptor to monitor
 * @param events  Requested events to watch for, a mask of %UEV_READ and %UEV_WRITE
 *
 * @return POSIX OK(0) or non-zero with @param errno set on error.
 */
int uev_io_set(uev_t *w, int fd, int events)
{
	if (uev_io_stop(w))
		return -1;

	/* Remove from internal list */
	LIST_REMOVE(w, link);

	return uev_io_init(w->ctx, w, (uev_cb_t *)w->cb, w->arg, fd, events);
}

/**
 * Stop an I/O watcher
 * @param w  Pointer to an uev_t watcher
 *
 * @return POSIX OK(0) or non-zero with @param errno set on error.
 */
int uev_io_stop(uev_t *w)
{
	return uev_watcher_stop(w);
}

/**
 * Local Variables:
 *  version-control: t
 *  indent-tabs-mode: t
 *  c-file-style: "linux"
 * End:
 */