cluster: RHEL6 - rgmanager: Use sysrq-b to reboot

[Lon Hohberger]

Gitweb:       
http://git.fedorahosted.org/git/cluster.git?p=cluster.git;a=commitdiff;h=...
Commit:        d6aaa9cc1e5de3d472c6c9169cf980cf2c0bea34
Parent:        4d6b610339b27a30deac7d9e29dc4236824b58ad
Author:        Lon Hohberger <lhh(a)redhat.com&gt;
AuthorDate:    Mon Jun 28 16:28:06 2010 -0400
Committer:     Lon Hohberger <lhh(a)redhat.com&gt;
CommitterDate: Tue Jun 29 14:29:02 2010 -0400

rgmanager: Use sysrq-b to reboot

This resolves an issue where the reboot() syscall
does not complete in rebooting the system, delaying
recovery if the main rgmanager process dies.

Resolves: rhbz#609181

Signed-off-by: Lon Hohberger <lhh(a)redhat.com&gt;
---
 rgmanager/src/daemons/watchdog.c |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/rgmanager/src/daemons/watchdog.c b/rgmanager/src/daemons/watchdog.c
index 6efd655..dfecab1 100644
--- a/rgmanager/src/daemons/watchdog.c
+++ b/rgmanager/src/daemons/watchdog.c
@@ -4,6 +4,7 @@
 #include <sys/reboot.h>
 #include <stdlib.h>
 #include <sys/mman.h>
+#include <fcntl.h>
 
 #include <signals.h>
 #include <logging.h>
@@ -39,6 +40,24 @@ redirect_signals(void)
 }
 
 
+static int
+sysrq_reboot(void)
+{
+	int fd;
+
+	fd = open("/proc/sysrq-trigger", O_WRONLY|O_SYNC);
+	if (fd < 0)
+		return fd;
+
+	write(fd, "b\n", 2);
+	fsync(fd);
+	fdatasync(fd);
+	close(fd);
+
+	return 0;
+}
+
+
 /**
  return watchdog's pid, or 0 on failure
 */
@@ -80,6 +99,7 @@ watchdog_init(void)
 #else
 			logt_print(LOG_CRIT, "Watchdog: Daemon died, rebooting...\n");
 			sync();
+			sysrq_reboot();
 		        reboot(RB_AUTOBOOT);
 #endif
 			exit(255);