4 Copyright (C) 1994, 1996, 1997 Free Software Foundation, Inc.
5 Copyright (C) 2005, Cendio AB.
6 This file is part of polypaudio.
7 Based on work for the GNU C Library.
9 polypaudio is free software; you can redistribute it and/or modify it
10 under the terms of the GNU Library General Public License as published
11 by the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 polypaudio is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Library General Public License for more details.
19 You should have received a copy of the GNU Library General Public
20 License along with polypaudio; If not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
25 /* Poll the file descriptors described by the NFDS structures starting at
26 FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
27 an event to occur; if TIMEOUT is -1, block until an event occurs.
28 Returns the number of file descriptors with events, zero if timed out,
37 #ifdef HAVE_SYS_SELECT_H
38 #include <sys/select.h>
43 #ifndef HAVE_SYS_POLL_H
45 #include <polypcore/core-util.h>
49 int poll (struct pollfd *fds, unsigned long int nfds, int timeout) {
51 fd_set rset, wset, xset;
69 * Windows does not support signals properly so waiting for them would
75 return select(0, NULL, NULL, NULL, NULL);
79 for (f = fds; f < &fds[nfds]; ++f) {
81 if (f->events & POLLIN)
82 FD_SET (f->fd, &rset);
83 if (f->events & POLLOUT)
84 FD_SET (f->fd, &wset);
85 if (f->events & POLLPRI)
86 FD_SET (f->fd, &xset);
87 if (f->fd > maxfd && (f->events & (POLLIN|POLLOUT|POLLPRI)))
92 tv.tv_sec = timeout / 1000;
93 tv.tv_usec = (timeout % 1000) * 1000;
95 ready = select ((SELECT_TYPE_ARG1) maxfd + 1, SELECT_TYPE_ARG234 &rset,
96 SELECT_TYPE_ARG234 &wset, SELECT_TYPE_ARG234 &xset,
97 SELECT_TYPE_ARG5 (timeout == -1 ? NULL : &tv));
98 if ((ready == -1) && (errno == EBADF)) {
107 for (f = fds; f < &fds[nfds]; ++f) {
109 fd_set sngl_rset, sngl_wset, sngl_xset;
111 FD_ZERO (&sngl_rset);
112 FD_ZERO (&sngl_wset);
113 FD_ZERO (&sngl_xset);
115 if (f->events & POLLIN)
116 FD_SET (f->fd, &sngl_rset);
117 if (f->events & POLLOUT)
118 FD_SET (f->fd, &sngl_wset);
119 if (f->events & POLLPRI)
120 FD_SET (f->fd, &sngl_xset);
121 if (f->events & (POLLIN|POLLOUT|POLLPRI)) {
122 struct timeval singl_tv;
125 singl_tv.tv_usec = 0;
127 if (select((SELECT_TYPE_ARG1) f->fd, SELECT_TYPE_ARG234 &rset,
128 SELECT_TYPE_ARG234 &wset, SELECT_TYPE_ARG234 &xset,
129 SELECT_TYPE_ARG5 &singl_tv) != -1) {
130 if (f->events & POLLIN)
131 FD_SET (f->fd, &rset);
132 if (f->events & POLLOUT)
133 FD_SET (f->fd, &wset);
134 if (f->events & POLLPRI)
135 FD_SET (f->fd, &xset);
136 if (f->fd > maxfd && (f->events & (POLLIN|POLLOUT|POLLPRI)))
139 } else if (errno == EBADF)
140 f->revents |= POLLNVAL;
146 /* Linux alters the tv struct... but it shouldn't matter here ...
147 * as we're going to be a little bit out anyway as we've just eaten
148 * more than a couple of cpu cycles above */
149 ready = select ((SELECT_TYPE_ARG1) maxfd + 1, SELECT_TYPE_ARG234 &rset,
150 SELECT_TYPE_ARG234 &wset, SELECT_TYPE_ARG234 &xset,
151 SELECT_TYPE_ARG5 (timeout == -1 ? NULL : &tv));
156 errno = WSAGetLastError();
161 for (f = fds; f < &fds[nfds]; ++f) {
164 if (FD_ISSET (f->fd, &rset)) {
165 /* support for POLLHUP. An hung up descriptor does not
166 increase the return value! */
167 if (recv (f->fd, data, 64, MSG_PEEK) == -1) {
168 if (errno == ESHUTDOWN || errno == ECONNRESET ||
169 errno == ECONNABORTED || errno == ENETRESET) {
170 fprintf(stderr, "Hangup\n");
171 f->revents |= POLLHUP;
176 f->revents |= POLLIN;
178 if (FD_ISSET (f->fd, &wset))
179 f->revents |= POLLOUT;
180 if (FD_ISSET (f->fd, &xset))
181 f->revents |= POLLPRI;
191 #endif /* HAVE_SYS_POLL_H */