summaryrefslogtreecommitdiff
path: root/src/polypcore/poll.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/polypcore/poll.c')
-rw-r--r--src/polypcore/poll.c190
1 files changed, 190 insertions, 0 deletions
diff --git a/src/polypcore/poll.c b/src/polypcore/poll.c
new file mode 100644
index 000000000..193fc8128
--- /dev/null
+++ b/src/polypcore/poll.c
@@ -0,0 +1,190 @@
+/* $Id$ */
+
+/***
+ Copyright (C) 1994, 1996, 1997 Free Software Foundation, Inc.
+ Copyright (C) 2005, Cendio AB.
+ This file is part of polypaudio.
+ Based on work for the GNU C Library.
+
+ polypaudio is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Library General Public License as published
+ by the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ polypaudio is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with polypaudio; If not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+ USA.
+***/
+
+/* Poll the file descriptors described by the NFDS structures starting at
+ FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
+ an event to occur; if TIMEOUT is -1, block until an event occurs.
+ Returns the number of file descriptors with events, zero if timed out,
+ or -1 for errors. */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <errno.h>
+
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+
+#include "winsock.h"
+
+#ifndef HAVE_SYS_POLL_H
+
+#include "util.h"
+#include "poll.h"
+
+int poll (struct pollfd *fds, unsigned long int nfds, int timeout) {
+ struct timeval tv;
+ fd_set rset, wset, xset;
+ struct pollfd *f;
+ int ready;
+ int maxfd = 0;
+ char data[64];
+
+ FD_ZERO (&rset);
+ FD_ZERO (&wset);
+ FD_ZERO (&xset);
+
+ if (nfds == 0) {
+ if (timeout >= 0) {
+ pa_msleep(timeout);
+ return 0;
+ }
+
+#ifdef OS_IS_WIN32
+ /*
+ * Windows does not support signals properly so waiting for them would
+ * mean a deadlock.
+ */
+ pa_msleep(100);
+ return 0;
+#else
+ return select(0, NULL, NULL, NULL, NULL);
+#endif
+ }
+
+ for (f = fds; f < &fds[nfds]; ++f) {
+ if (f->fd != -1) {
+ if (f->events & POLLIN)
+ FD_SET (f->fd, &rset);
+ if (f->events & POLLOUT)
+ FD_SET (f->fd, &wset);
+ if (f->events & POLLPRI)
+ FD_SET (f->fd, &xset);
+ if (f->fd > maxfd && (f->events & (POLLIN|POLLOUT|POLLPRI)))
+ maxfd = f->fd;
+ }
+ }
+
+ tv.tv_sec = timeout / 1000;
+ tv.tv_usec = (timeout % 1000) * 1000;
+
+ ready = select ((SELECT_TYPE_ARG1) maxfd + 1, SELECT_TYPE_ARG234 &rset,
+ SELECT_TYPE_ARG234 &wset, SELECT_TYPE_ARG234 &xset,
+ SELECT_TYPE_ARG5 (timeout == -1 ? NULL : &tv));
+ if ((ready == -1) && (errno == EBADF)) {
+ ready = 0;
+
+ FD_ZERO (&rset);
+ FD_ZERO (&wset);
+ FD_ZERO (&xset);
+
+ maxfd = -1;
+
+ for (f = fds; f < &fds[nfds]; ++f) {
+ if (f->fd != -1) {
+ fd_set sngl_rset, sngl_wset, sngl_xset;
+
+ FD_ZERO (&sngl_rset);
+ FD_ZERO (&sngl_wset);
+ FD_ZERO (&sngl_xset);
+
+ if (f->events & POLLIN)
+ FD_SET (f->fd, &sngl_rset);
+ if (f->events & POLLOUT)
+ FD_SET (f->fd, &sngl_wset);
+ if (f->events & POLLPRI)
+ FD_SET (f->fd, &sngl_xset);
+ if (f->events & (POLLIN|POLLOUT|POLLPRI)) {
+ struct timeval singl_tv;
+
+ singl_tv.tv_sec = 0;
+ singl_tv.tv_usec = 0;
+
+ if (select((SELECT_TYPE_ARG1) f->fd, SELECT_TYPE_ARG234 &rset,
+ SELECT_TYPE_ARG234 &wset, SELECT_TYPE_ARG234 &xset,
+ SELECT_TYPE_ARG5 &singl_tv) != -1) {
+ if (f->events & POLLIN)
+ FD_SET (f->fd, &rset);
+ if (f->events & POLLOUT)
+ FD_SET (f->fd, &wset);
+ if (f->events & POLLPRI)
+ FD_SET (f->fd, &xset);
+ if (f->fd > maxfd && (f->events & (POLLIN|POLLOUT|POLLPRI)))
+ maxfd = f->fd;
+ ++ready;
+ } else if (errno == EBADF)
+ f->revents |= POLLNVAL;
+ }
+ }
+ }
+
+ if (ready) {
+ /* Linux alters the tv struct... but it shouldn't matter here ...
+ * as we're going to be a little bit out anyway as we've just eaten
+ * more than a couple of cpu cycles above */
+ ready = select ((SELECT_TYPE_ARG1) maxfd + 1, SELECT_TYPE_ARG234 &rset,
+ SELECT_TYPE_ARG234 &wset, SELECT_TYPE_ARG234 &xset,
+ SELECT_TYPE_ARG5 (timeout == -1 ? NULL : &tv));
+ }
+ }
+
+#ifdef OS_IS_WIN32
+ errno = WSAGetLastError();
+#endif
+
+ if (ready > 0) {
+ ready = 0;
+ for (f = fds; f < &fds[nfds]; ++f) {
+ f->revents = 0;
+ if (f->fd != -1) {
+ if (FD_ISSET (f->fd, &rset)) {
+ /* support for POLLHUP. An hung up descriptor does not
+ increase the return value! */
+ if (recv (f->fd, data, 64, MSG_PEEK) == -1) {
+ if (errno == ESHUTDOWN || errno == ECONNRESET ||
+ errno == ECONNABORTED || errno == ENETRESET) {
+ fprintf(stderr, "Hangup\n");
+ f->revents |= POLLHUP;
+ }
+ }
+
+ if (f->revents == 0)
+ f->revents |= POLLIN;
+ }
+ if (FD_ISSET (f->fd, &wset))
+ f->revents |= POLLOUT;
+ if (FD_ISSET (f->fd, &xset))
+ f->revents |= POLLPRI;
+ }
+ if (f->revents)
+ ready++;
+ }
+ }
+
+ return ready;
+}
+
+#endif /* HAVE_SYS_POLL_H */