[gssapi-openssh.git] / openssh / openbsd-compat / bsd-poll.c

/* $Id$ */

/*
 * Copyright (c) 2004, 2005, 2007 Darren Tucker (dtucker at zip com au).
 *
 * 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 "includes.h"
#if !defined(HAVE_POLL)

#ifdef HAVE_SYS_SELECT_H
# include <sys/select.h>
#endif

#include <stdlib.h>
#include <errno.h>
#include "bsd-poll.h"

/*
 * A minimal implementation of poll(2), built on top of select(2).
 *
 * Only supports POLLIN and POLLOUT flags in pfd.events, and POLLIN, POLLOUT
 * and POLLERR flags in revents.
 *
 * Supports pfd.fd = -1 meaning "unused" although it's not standard.
 */

int
poll(struct pollfd *fds, nfds_t nfds, int timeout)
{
	nfds_t i;
	int saved_errno, ret, fd, maxfd = 0;
	fd_set *readfds = NULL, *writefds = NULL, *exceptfds = NULL;
	size_t nmemb;
	struct timeval tv, *tvp = NULL;

	for (i = 0; i < nfds; i++) {
		fd = fds[i].fd;
		if (fd >= FD_SETSIZE) {
			errno = EINVAL;
			return -1;
		}
		maxfd = MAX(maxfd, fd);
	}

	nmemb = howmany(maxfd + 1 , NFDBITS);
	if ((readfds = calloc(nmemb, sizeof(fd_mask))) == NULL ||
	    (writefds = calloc(nmemb, sizeof(fd_mask))) == NULL ||
	    (exceptfds = calloc(nmemb, sizeof(fd_mask))) == NULL) {
		saved_errno = ENOMEM;
		ret = -1;
		goto out;
	}

	/* populate event bit vectors for the events we're interested in */
	for (i = 0; i < nfds; i++) {
		fd = fds[i].fd;
		if (fd == -1)
			continue;
		if (fds[i].events & POLLIN) {
			FD_SET(fd, readfds);
			FD_SET(fd, exceptfds);
		}
		if (fds[i].events & POLLOUT) {
			FD_SET(fd, writefds);
			FD_SET(fd, exceptfds);
		}
	}

	/* poll timeout is msec, select is timeval (sec + usec) */
	if (timeout >= 0) {
		tv.tv_sec = timeout / 1000;
		tv.tv_usec = (timeout % 1000) * 1000;
		tvp = &tv;
	}

	ret = select(maxfd + 1, readfds, writefds, exceptfds, tvp);
	saved_errno = errno;

	/* scan through select results and set poll() flags */
	for (i = 0; i < nfds; i++) {
		fd = fds[i].fd;
		fds[i].revents = 0;
		if (fd == -1)
			continue;
		if (FD_ISSET(fd, readfds)) {
			fds[i].revents |= POLLIN;
		}
		if (FD_ISSET(fd, writefds)) {
			fds[i].revents |= POLLOUT;
		}
		if (FD_ISSET(fd, exceptfds)) {
			fds[i].revents |= POLLERR;
		}
	}

out:
	if (readfds != NULL)
		free(readfds);
	if (writefds != NULL)
		free(writefds);
	if (exceptfds != NULL)
		free(exceptfds);
	if (ret == -1)
		errno = saved_errno;
	return ret;
}
#endif
Commit	Line	Data
d4487008	1	/* $Id$ */
	2
	3	/*
	4	* Copyright (c) 2004, 2005, 2007 Darren Tucker (dtucker at zip com au).
	5	*
	6	* Permission to use, copy, modify, and distribute this software for any
	7	* purpose with or without fee is hereby granted, provided that the above
	8	* copyright notice and this permission notice appear in all copies.
	9	*
	10	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	11	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	12	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	13	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	14	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	15	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	16	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	17	*/
	18
	19	#include "includes.h"
47686178	20	#if !defined(HAVE_POLL)
d4487008	21
	22	#ifdef HAVE_SYS_SELECT_H
	23	# include <sys/select.h>
	24	#endif
	25
22616013	26	#include <stdlib.h>
d4487008	27	#include <errno.h>
	28	#include "bsd-poll.h"
	29
	30	/*
	31	* A minimal implementation of poll(2), built on top of select(2).
	32	*
	33	* Only supports POLLIN and POLLOUT flags in pfd.events, and POLLIN, POLLOUT
	34	* and POLLERR flags in revents.
	35	*
	36	* Supports pfd.fd = -1 meaning "unused" although it's not standard.
	37	*/
	38
	39	int
	40	poll(struct pollfd *fds, nfds_t nfds, int timeout)
	41	{
	42	nfds_t i;
	43	int saved_errno, ret, fd, maxfd = 0;
	44	fd_set readfds = NULL, writefds = NULL, *exceptfds = NULL;
	45	size_t nmemb;
	46	struct timeval tv, *tvp = NULL;
	47
	48	for (i = 0; i < nfds; i++) {
91d9cdd3	49	fd = fds[i].fd;
d4487008	50	if (fd >= FD_SETSIZE) {
	51	errno = EINVAL;
	52	return -1;
	53	}
91d9cdd3	54	maxfd = MAX(maxfd, fd);
d4487008	55	}
	56
	57	nmemb = howmany(maxfd + 1 , NFDBITS);
	58	if ((readfds = calloc(nmemb, sizeof(fd_mask))) == NULL \|\|
	59	(writefds = calloc(nmemb, sizeof(fd_mask))) == NULL \|\|
	60	(exceptfds = calloc(nmemb, sizeof(fd_mask))) == NULL) {
	61	saved_errno = ENOMEM;
	62	ret = -1;
	63	goto out;
	64	}
	65
	66	/* populate event bit vectors for the events we're interested in */
	67	for (i = 0; i < nfds; i++) {
	68	fd = fds[i].fd;
	69	if (fd == -1)
	70	continue;
	71	if (fds[i].events & POLLIN) {
	72	FD_SET(fd, readfds);
	73	FD_SET(fd, exceptfds);
	74	}
	75	if (fds[i].events & POLLOUT) {
	76	FD_SET(fd, writefds);
	77	FD_SET(fd, exceptfds);
	78	}
	79	}
	80
	81	/* poll timeout is msec, select is timeval (sec + usec) */
	82	if (timeout >= 0) {
	83	tv.tv_sec = timeout / 1000;
	84	tv.tv_usec = (timeout % 1000) * 1000;
	85	tvp = &tv;
	86	}
	87
	88	ret = select(maxfd + 1, readfds, writefds, exceptfds, tvp);
	89	saved_errno = errno;
	90
	91	/* scan through select results and set poll() flags */
	92	for (i = 0; i < nfds; i++) {
	93	fd = fds[i].fd;
	94	fds[i].revents = 0;
	95	if (fd == -1)
	96	continue;
	97	if (FD_ISSET(fd, readfds)) {
	98	fds[i].revents \|= POLLIN;
	99	}
	100	if (FD_ISSET(fd, writefds)) {
	101	fds[i].revents \|= POLLOUT;
	102	}
	103	if (FD_ISSET(fd, exceptfds)) {
	104	fds[i].revents \|= POLLERR;
	105	}
	106	}
	107
	108	out:
	109	if (readfds != NULL)
	110	free(readfds);
	111	if (writefds != NULL)
	112	free(writefds);
	113	if (exceptfds != NULL)
	114	free(exceptfds);
	115	if (ret == -1)
	116	errno = saved_errno;
	117	return ret;
	118	}
119	#endif