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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 ret, fd, maxfd = 0;
- fd_set readfds, writefds, exceptfds;
-
- for (i = 0; i < nfds; i++) {
- fd = fds[i].fd;
- if (fd != -1 && fd >= FD_SETSIZE) {
- errno = EINVAL;
- return -1;
- }
- maxfd = MAX(maxfd, fd);
- }
-
- /* populate event bit vectors for the events we're interested in */
- FD_ZERO(&readfds);
- FD_ZERO(&writefds);
- FD_ZERO(&exceptfds);
- 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);
-
- /* 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;
- }
-
- 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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