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/* select filedescriptor handling, taken from:
* userspace logging daemon for the iptables ULOG target
* of the linux 2.4 netfilter subsystem.
*
* (C) 2000-2009 by Harald Welte <laforge@gnumonks.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* 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 General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <fcntl.h>
#include <openbsc/select.h>
#include <openbsc/linuxlist.h>
#include <openbsc/timer.h>
static int maxfd = 0;
static LLIST_HEAD(bsc_fds);
int bsc_register_fd(struct bsc_fd *fd)
{
int flags;
/* make FD nonblocking */
flags = fcntl(fd->fd, F_GETFL);
if (flags < 0)
return flags;
flags |= O_NONBLOCK;
flags = fcntl(fd->fd, F_SETFL, flags);
if (flags < 0)
return flags;
/* Register FD */
if (fd->fd > maxfd)
maxfd = fd->fd;
llist_add_tail(&fd->list, &bsc_fds);
return 0;
}
void bsc_unregister_fd(struct bsc_fd *fd)
{
llist_del(&fd->list);
}
int bsc_select_main(int polling)
{
struct bsc_fd *ufd, *tmp;
fd_set readset, writeset, exceptset;
int work = 0, rc;
struct timeval no_time = {0, 0};
FD_ZERO(&readset);
FD_ZERO(&writeset);
FD_ZERO(&exceptset);
/* prepare read and write fdsets */
llist_for_each_entry(ufd, &bsc_fds, list) {
if (ufd->when & BSC_FD_READ)
FD_SET(ufd->fd, &readset);
if (ufd->when & BSC_FD_WRITE)
FD_SET(ufd->fd, &writeset);
if (ufd->when & BSC_FD_EXCEPT)
FD_SET(ufd->fd, &exceptset);
}
if (!polling)
bsc_prepare_timers();
rc = select(maxfd+1, &readset, &writeset, &exceptset, polling ? &no_time : bsc_nearest_timer());
if (rc < 0)
return 0;
/* fire timers */
bsc_update_timers();
/* call registered callback functions */
llist_for_each_entry_safe(ufd, tmp, &bsc_fds, list) {
int flags = 0;
if (FD_ISSET(ufd->fd, &readset))
flags |= BSC_FD_READ;
if (FD_ISSET(ufd->fd, &writeset))
flags |= BSC_FD_WRITE;
if (FD_ISSET(ufd->fd, &exceptset))
flags |= BSC_FD_EXCEPT;
if (flags) {
work = 1;
ufd->cb(ufd, flags);
}
}
return work;
}
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