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-rw-r--r--src/select.c97
1 files changed, 97 insertions, 0 deletions
diff --git a/src/select.c b/src/select.c
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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) 2000-2008 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>
+
+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 -1;
+ flags |= O_NONBLOCK;
+ flags = fcntl(fd->fd, F_SETFL, flags);
+ if (flags < 0)
+ return -1;
+
+ /* 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()
+{
+ struct bsc_fd *ufd;
+ fd_set readset, writeset, exceptset;
+ int i;
+
+ 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);
+ }
+
+ i = select(maxfd+1, &readset, &writeset, &exceptset, NULL);
+ if (i > 0) {
+ /* call registered callback functions */
+ llist_for_each_entry(ufd, &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)
+ ufd->cb(ufd, flags);
+ }
+ }
+ return i;
+}