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/* select related functions
*
* (C) 2000-2005 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 <ulogd/ulogd.h>
#include <ulogd/linuxlist.h>
static int maxfd = 0;
static fd_set readset, writeset, exceptset;
static LLIST_HEAD(ulogd_fds);
int ulogd_register_fd(struct ulogd_fd *fd)
{
int flags;
/* make FD nonblocking */
flags = fcntl(fd->fd, F_GETFL);
if (flags < 0)
return -1;
flags |= O_NONBLOCK;
flags = fcntl(fd->fd, F_SETFL, flags);
if (flags < 0)
return -1;
if (fd->when & ULOGD_FD_READ)
FD_SET(fd->fd, &readset);
if (fd->when & ULOGD_FD_WRITE)
FD_SET(fd->fd, &writeset);
if (fd->when & ULOGD_FD_EXCEPT)
FD_SET(fd->fd, &exceptset);
/* Register FD */
if (fd->fd > maxfd)
maxfd = fd->fd;
llist_add_tail(&fd->list, &ulogd_fds);
return 0;
}
void ulogd_unregister_fd(struct ulogd_fd *fd)
{
if (fd->when & ULOGD_FD_READ)
FD_CLR(fd->fd, &readset);
if (fd->when & ULOGD_FD_WRITE)
FD_CLR(fd->fd, &writeset);
if (fd->when & ULOGD_FD_EXCEPT)
FD_CLR(fd->fd, &exceptset);
llist_del(&fd->list);
/* Improvement: recalculate maxfd iif fd->fd == maxfd */
maxfd = -1;
llist_for_each_entry(fd, &ulogd_fds, list) {
if (fd->fd > maxfd)
maxfd = fd->fd;
}
}
int ulogd_select_main(struct timeval *tv)
{
struct ulogd_fd *ufd;
fd_set rds_tmp, wrs_tmp, exs_tmp;
int i;
rds_tmp = readset;
wrs_tmp = writeset;
exs_tmp = exceptset;
i = select(maxfd+1, &rds_tmp, &wrs_tmp, &exs_tmp, tv);
if (i > 0) {
/* call registered callback functions */
llist_for_each_entry(ufd, &ulogd_fds, list) {
int flags = 0;
if (FD_ISSET(ufd->fd, &rds_tmp))
flags |= ULOGD_FD_READ;
if (FD_ISSET(ufd->fd, &wrs_tmp))
flags |= ULOGD_FD_WRITE;
if (FD_ISSET(ufd->fd, &exs_tmp))
flags |= ULOGD_FD_EXCEPT;
if (flags)
ufd->cb(ufd->fd, flags, ufd->data);
}
}
return i;
}
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