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/* $OpenBSD: imsg_subr.c,v 1.1 2015/07/21 04:06:04 yasuoka Exp $ */
/*
* Copyright (c) 2015 YASUOKA Masahiko <yasuoka@yasuoka.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/uio.h>
#include <imsg.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <poll.h>
#include <errno.h>
#include "imsg_subr.h"
/*
* Check readability not to spin before calling imsg_read(3). Wait 'millisec'
* until it becomes readable.
*/
int
imsg_sync_read(struct imsgbuf *ibuf, int millisec)
{
struct pollfd fds[1];
int retval;
fds[0].fd = ibuf->fd;
fds[0].events = POLLIN;
retval = poll(fds, 1, millisec);
if (retval == 0) {
errno = EAGAIN;
return (-1);
}
if (retval > 0 && (fds[0].revents & POLLIN) != 0)
return imsg_read(ibuf);
return (-1);
}
/*
* Check writability not to spin before calling imsg_flush(3). Wait 'millisec'
* until it becomes writable.
*/
int
imsg_sync_flush(struct imsgbuf *ibuf, int millisec)
{
struct pollfd fds[1];
int retval;
if (!ibuf->w.queued)
return (0); /* already flushed */
fds[0].fd = ibuf->fd;
fds[0].events = POLLOUT;
retval = poll(fds, 1, millisec);
if (retval == 0) {
errno = EAGAIN;
return (-1);
}
if (retval > 0 && (fds[0].revents & POLLOUT) != 0)
return imsg_flush(ibuf);
return (-1);
}
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