3 This file is part of PulseAudio.
5 Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
7 PulseAudio is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Lesser General Public License as published
9 by the Free Software Foundation; either version 2.1 of the License,
10 or (at your option) any later version.
12 PulseAudio is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with PulseAudio; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
24 Based on work for the GNU C Library.
25 Copyright (C) 1994, 1996, 1997 Free Software Foundation, Inc.
28 /* Poll the file descriptors described by the NFDS structures starting at
29 FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
30 an event to occur; if TIMEOUT is -1, block until an event occurs.
31 Returns the number of file descriptors with events, zero if timed out,
38 #ifdef HAVE_SYS_IOCTL_H
39 #include <sys/ioctl.h>
45 #ifdef HAVE_SYS_SELECT_H
46 #include <sys/select.h>
49 #include <pulsecore/socket.h>
50 #include <pulsecore/core-util.h>
51 #include <pulse/util.h>
55 /* Mac OSX fails to implement poll() in a working way since 10.4. IOW, for
56 * several years. We need to enable a dirty workaround and emulate that call
57 * with select(), just like for Windows. sic! */
59 #if !defined(HAVE_POLL_H) || defined(OS_IS_DARWIN)
61 int pa_poll (struct pollfd *fds, unsigned long int nfds, int timeout) {
63 fd_set rset, wset, xset;
83 * Windows does not support signals properly so waiting for them would
89 return select(0, NULL, NULL, NULL, NULL);
93 for (f = fds; f < &fds[nfds]; ++f) {
95 if (f->events & POLLIN)
96 FD_SET (f->fd, &rset);
97 if (f->events & POLLOUT)
98 FD_SET (f->fd, &wset);
99 if (f->events & POLLPRI)
100 FD_SET (f->fd, &xset);
101 if (f->fd > maxfd && (f->events & (POLLIN|POLLOUT|POLLPRI)))
106 tv.tv_sec = timeout / 1000;
107 tv.tv_usec = (timeout % 1000) * 1000;
109 ready = select(maxfd + 1, &rset, &wset, &xset, (timeout == -1 ? NULL : &tv));
111 if ((ready == -1) && (errno == EBADF)) {
117 * Windows has no fcntl(), so we have to trick around with more
118 * select() calls to find out what went wrong
125 for (f = fds; f < &fds[nfds]; ++f) {
127 fd_set sngl_rset, sngl_wset, sngl_xset;
129 FD_ZERO (&sngl_rset);
130 FD_ZERO (&sngl_wset);
131 FD_ZERO (&sngl_xset);
133 if (f->events & POLLIN)
134 FD_SET (f->fd, &sngl_rset);
135 if (f->events & POLLOUT)
136 FD_SET (f->fd, &sngl_wset);
137 if (f->events & POLLPRI)
138 FD_SET (f->fd, &sngl_xset);
139 if (f->events & (POLLIN|POLLOUT|POLLPRI)) {
140 struct timeval singl_tv;
143 singl_tv.tv_usec = 0;
145 if (select(f->fd, &rset, &wset, &xset, &singl_tv) != -1) {
146 if (f->events & POLLIN)
147 FD_SET (f->fd, &rset);
148 if (f->events & POLLOUT)
149 FD_SET (f->fd, &wset);
150 if (f->events & POLLPRI)
151 FD_SET (f->fd, &xset);
152 if (f->fd > maxfd && (f->events & (POLLIN|POLLOUT|POLLPRI)))
155 } else if (errno == EBADF)
156 f->revents |= POLLNVAL;
161 #else /* !OS_IS_WIN32 */
163 for (f = fds; f < &fds[nfds]; f++)
165 /* use fcntl() to find out whether the descriptor is valid */
166 if (fcntl(f->fd, F_GETFL) != -1) {
167 if (f->fd > maxfd && (f->events & (POLLIN|POLLOUT|POLLPRI))) {
172 FD_CLR(f->fd, &rset);
173 FD_CLR(f->fd, &wset);
174 FD_CLR(f->fd, &xset);
181 /* Linux alters the tv struct... but it shouldn't matter here ...
182 * as we're going to be a little bit out anyway as we've just eaten
183 * more than a couple of cpu cycles above */
184 ready = select(maxfd + 1, &rset, &wset, &xset, (timeout == -1 ? NULL : &tv));
189 errno = WSAGetLastError();
194 for (f = fds; f < &fds[nfds]; ++f) {
197 if (FD_ISSET (f->fd, &rset)) {
198 /* support for POLLHUP. An hung up descriptor does not
199 increase the return value! */
201 /* There is a bug in Mac OS X that causes it to ignore MSG_PEEK
202 * for some kinds of descriptors. Detect if this descriptor is a
203 * connected socket, a server socket, or something else using a
204 * 0-byte recv, and use ioctl(2) to detect POLLHUP. */
205 int r = recv(f->fd, NULL, 0, MSG_PEEK);
206 if (r == 0 || (r < 0 && errno == ENOTSOCK))
207 ioctl(f->fd, FIONREAD, &r);
210 f->revents |= POLLHUP;
211 #else /* !OS_IS_DARWIN */
212 if (recv (f->fd, data, 64, MSG_PEEK) == -1) {
213 if (errno == ESHUTDOWN || errno == ECONNRESET ||
214 errno == ECONNABORTED || errno == ENETRESET) {
215 fprintf(stderr, "Hangup\n");
216 f->revents |= POLLHUP;
222 f->revents |= POLLIN;
224 if (FD_ISSET (f->fd, &wset))
225 f->revents |= POLLOUT;
226 if (FD_ISSET (f->fd, &xset))
227 f->revents |= POLLPRI;
237 #endif /* HAVE_SYS_POLL_H */