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-rw-r--r--src/notify.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/src/notify.c b/src/notify.c
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index 000000000..85db46192
--- /dev/null
+++ b/src/notify.c
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+/* 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));
+}