129 lines
3.0 KiB
C
129 lines
3.0 KiB
C
/* select filedescriptor handling, taken from:
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* userspace logging daemon for the iptables ULOG target
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* of the linux 2.4 netfilter subsystem.
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*
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* (C) 2000-2009 by Harald Welte <laforge@gnumonks.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <fcntl.h>
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#include <osmocore/select.h>
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#include <osmocore/linuxlist.h>
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#include <osmocore/timer.h>
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#ifdef HAVE_SYS_SELECT_H
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static int maxfd = 0;
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static LLIST_HEAD(bsc_fds);
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static int unregistered_count;
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int bsc_register_fd(struct bsc_fd *fd)
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{
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int flags;
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/* make FD nonblocking */
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flags = fcntl(fd->fd, F_GETFL);
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if (flags < 0)
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return flags;
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flags |= O_NONBLOCK;
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flags = fcntl(fd->fd, F_SETFL, flags);
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if (flags < 0)
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return flags;
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/* Register FD */
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if (fd->fd > maxfd)
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maxfd = fd->fd;
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llist_add_tail(&fd->list, &bsc_fds);
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return 0;
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}
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void bsc_unregister_fd(struct bsc_fd *fd)
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{
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unregistered_count++;
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llist_del(&fd->list);
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}
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int bsc_select_main(int polling)
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{
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struct bsc_fd *ufd, *tmp;
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fd_set readset, writeset, exceptset;
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int work = 0, rc;
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struct timeval no_time = {0, 0};
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FD_ZERO(&readset);
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FD_ZERO(&writeset);
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FD_ZERO(&exceptset);
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/* prepare read and write fdsets */
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llist_for_each_entry(ufd, &bsc_fds, list) {
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if (ufd->when & BSC_FD_READ)
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FD_SET(ufd->fd, &readset);
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if (ufd->when & BSC_FD_WRITE)
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FD_SET(ufd->fd, &writeset);
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if (ufd->when & BSC_FD_EXCEPT)
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FD_SET(ufd->fd, &exceptset);
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}
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bsc_timer_check();
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if (!polling)
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bsc_prepare_timers();
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rc = select(maxfd+1, &readset, &writeset, &exceptset, polling ? &no_time : bsc_nearest_timer());
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if (rc < 0)
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return 0;
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/* fire timers */
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bsc_update_timers();
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/* call registered callback functions */
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restart:
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unregistered_count = 0;
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llist_for_each_entry_safe(ufd, tmp, &bsc_fds, list) {
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int flags = 0;
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if (FD_ISSET(ufd->fd, &readset)) {
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flags |= BSC_FD_READ;
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FD_CLR(ufd->fd, &readset);
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}
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if (FD_ISSET(ufd->fd, &writeset)) {
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flags |= BSC_FD_WRITE;
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FD_CLR(ufd->fd, &writeset);
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}
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if (FD_ISSET(ufd->fd, &exceptset)) {
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flags |= BSC_FD_EXCEPT;
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FD_CLR(ufd->fd, &exceptset);
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}
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if (flags) {
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work = 1;
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ufd->cb(ufd, flags);
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}
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/* ugly, ugly hack. If more than one filedescriptors were
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* unregistered, they might have been consecutive and
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* llist_for_each_entry_safe() is no longer safe */
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if (unregistered_count > 1)
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goto restart;
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}
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return work;
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}
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#endif /* _HAVE_SYS_SELECT_H */
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