1 files changed, 70 insertions, 0 deletions
diff --git a/src/notify.c b/src/notify.c
new file mode 100644
index 000000000..85db46192
--- /dev/null
+++ b/src/notify.c
@@ -0,0 +1,70 @@
+/* the Music Player Daemon (MPD)
+ * Copyright (C) 2008 Max Kellermann <max@duempel.org>
+ * This project's homepage is: http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 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 "notify.h"
+
+#include <assert.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int set_nonblock(int fd)
+{
+	int ret;
+
+	assert(fd >= 0);
+
+	ret = fcntl(fd, F_GETFL, 0);
+	if (ret < 0)
+		return ret;
+
+	return fcntl(fd, F_SETFL, ret|O_NONBLOCK);
+}
+
+int initNotify(Notify *notify)
+{
+	int ret;
+
+	ret = pipe(notify->fds);
+	if (ret < 0)
+		return -1;
+
+	ret = set_nonblock(notify->fds[1]);
+	if (ret < 0) {
+		close(notify->fds[0]);
+		close(notify->fds[1]);
+		return -1;
+	}
+
+	return 0;
+}
+
+int waitNotify(Notify *notify)
+{
+	char buffer[64];
+	ssize_t nbytes;
+
+	nbytes = read(notify->fds[0], buffer, sizeof(buffer));
+	return (int)nbytes;
+}
+
+int signalNotify(Notify *notify)
+{
+	char buffer[1] = { 0 };
+
+	return (int)write(notify->fds[1], &buffer, sizeof(buffer));
+}