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/*
* 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_PPOLL) || !defined(HAVE_POLL) || defined(BROKEN_POLL)
#include <sys/types.h>
#include <sys/time.h>
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#ifdef HAVE_SYS_SELECT_H
# include <sys/select.h>
#endif
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include "bsd-poll.h"
#if !defined(HAVE_PPOLL) || defined(BROKEN_POLL)
/*
* A minimal implementation of ppoll(2), built on top of pselect(2).
*
* Only supports POLLIN, POLLOUT and POLLPRI flags in pfd.events and
* revents. Notably POLLERR, POLLHUP and POLLNVAL are not supported.
*
* Supports pfd.fd = -1 meaning "unused" although it's not standard.
*/
int
ppoll(struct pollfd *fds, nfds_t nfds, const struct timespec *tmoutp,
const sigset_t *sigmask)
{
nfds_t i;
int saved_errno, ret, fd, maxfd = 0;
fd_set *readfds = NULL, *writefds = NULL, *exceptfds = NULL;
size_t nmemb;
for (i = 0; i < nfds; i++) {
fd = fds[i].fd;
if (fd != -1 && 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);
if (fds[i].events & POLLOUT)
FD_SET(fd, writefds);
if (fds[i].events & POLLPRI)
FD_SET(fd, exceptfds);
}
ret = pselect(maxfd + 1, readfds, writefds, exceptfds, tmoutp, sigmask);
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 ((fds[i].events & POLLIN) && FD_ISSET(fd, readfds))
fds[i].revents |= POLLIN;
if ((fds[i].events & POLLOUT) && FD_ISSET(fd, writefds))
fds[i].revents |= POLLOUT;
if ((fds[i].events & POLLPRI) && FD_ISSET(fd, exceptfds))
fds[i].revents |= POLLPRI;
}
out:
free(readfds);
free(writefds);
free(exceptfds);
if (ret == -1)
errno = saved_errno;
return ret;
}
#endif /* !HAVE_PPOLL || BROKEN_POLL */
#if !defined(HAVE_POLL) || defined(BROKEN_POLL)
int
poll(struct pollfd *fds, nfds_t nfds, int timeout)
{
struct timespec ts, *tsp = NULL;
/* poll timeout is msec, ppoll is timespec (sec + nsec) */
if (timeout >= 0) {
ts.tv_sec = timeout / 1000;
ts.tv_nsec = (timeout % 1000) * 1000000;
tsp = &ts;
}
return ppoll(fds, nfds, tsp, NULL);
}
#endif /* !HAVE_POLL || BROKEN_POLL */
#endif /* !HAVE_PPOLL || !HAVE_POLL || BROKEN_POLL */
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