[stgt] [PATCH 1/3] few logger fixes

[Alexander Nezhinsky]

register custom SIGSEGV handler that performs all log-related cleanups
in orderly fashion; force the same behaviour when the parent exits

Signed-off-by: Alexander Nezhinsky <alexandern at voltaire.com>
---
 usr/log.c |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)

diff --git a/usr/log.c b/usr/log.c
index 66f3e14..305e14f 100644
--- a/usr/log.c
+++ b/usr/log.c
@@ -29,6 +29,7 @@
 #include <sys/ipc.h>
 #include <sys/types.h>
 #include <sys/wait.h>
+#include <sys/prctl.h>
 
 #include "log.h"
 
@@ -327,6 +328,14 @@ static void log_flush(void)
 	}
 }
 
+static void log_sigsegv(void)
+{
+	log_error("tgtd logger exits abnormally, pid:%d\n", getpid());
+	log_flush();
+	closelog();
+	free_logarea();
+}
+
 int log_init(char *program_name, int size, int daemon, int debug)
 {
 	is_debug = debug;
@@ -358,11 +367,13 @@ int log_init(char *program_name, int size, int daemon, int debug)
 		}
 
 		/* flush on daemon's crash */
-		sa_new.sa_handler = (void*)log_flush;
+		sa_new.sa_handler = (void*)log_sigsegv;
 		sigemptyset(&sa_new.sa_mask);
 		sa_new.sa_flags = 0;
 		sigaction(SIGSEGV, &sa_new, &sa_old );
 
+		prctl(PR_SET_PDEATHSIG, SIGSEGV);
+
 		while (la->active) {
 			log_flush();
 			sleep(1);
-- 
1.6.5

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