MNCC<->SIP bridge; attaches to OsmoMSC to interface with external SIP VoIP telephony https://osmocom.org/projects/osmo-sip-conector
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osmo-sip-connector/src/evpoll.c

108 lines
2.7 KiB

/*
* (C) 2016 by Holger Hans Peter Freyther
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "evpoll.h"
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/select.h>
#include <osmocom/core/timer.h>
#include <sys/select.h>
/* based on osmo_select_main GPLv2+ so combined compatible with AGPLv3+ */
int evpoll(struct pollfd *fds, nfds_t nfds, int timeout)
{
struct timeval *tv, null_tv = { 0, 0} , poll_tv;
fd_set readset, writeset, exceptset;
int maxfd, rc, i;
FD_ZERO(&readset);
FD_ZERO(&writeset);
FD_ZERO(&exceptset);
/* prepare read and write fdsets */
maxfd = osmo_fd_fill_fds(&readset, &writeset, &exceptset);
for (i = 0; i < nfds; ++i) {
if (fds[i].fd < 0)
continue;
if ((fds[i].events & (POLLIN | POLLOUT | POLLERR)) == 0)
continue;
/* copy events, glib seems to map POLLPRI to exceptionset? */
if (fds[i].events & POLLIN)
FD_SET(fds[i].fd, &readset);
if (fds[i].events & POLLOUT)
FD_SET(fds[i].fd, &writeset);
if (fds[i].events & POLLERR)
FD_SET(fds[i].fd, &exceptset);
if (fds[i].fd > maxfd)
maxfd = fds[i].fd;
}
osmo_timers_check();
osmo_timers_prepare();
/*
* 0 == wake-up immediately
* -1 == block forever.. which will depend on our timers
*/
if (timeout == 0) {
tv = &null_tv;
} else if (timeout == -1)
tv = osmo_timers_nearest();
else {
poll_tv.tv_sec = timeout / 1000;
poll_tv.tv_usec = (timeout % 1000) * 1000;
tv = osmo_timers_nearest();
if (!tv)
tv = &poll_tv;
else if (timercmp(&poll_tv, tv, <))
tv = &poll_tv;
}
rc = select(maxfd+1, &readset, &writeset, &exceptset, tv);
if (rc < 0)
return 0;
/* fire timers */
osmo_timers_update();
/* call registered callback functions */
osmo_fd_disp_fds(&readset, &writeset, &exceptset);
for (i = 0; i < nfds; ++i) {
if (fds[i].fd < 0)
continue;
fds[i].revents = 0;
if (FD_ISSET(fds[i].fd, &readset))
fds[i].revents = POLLIN;
if (FD_ISSET(fds[i].fd, &writeset))
fds[i].revents |= POLLOUT;
if (FD_ISSET(fds[i].fd, &exceptset))
fds[i].revents |= POLLERR;
}
return rc;
}