Change in osmo-bsc[master]: main: generate coredump and exit upon SIGABRT received

[pespin]

pespin has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-bsc/+/21336 )


Change subject: main: generate coredump and exit upon SIGABRT received
......................................................................

main: generate coredump and exit upon SIGABRT received

Previous code relied on abort() switching sigaction to SIG_FDL +
retriggering SIGABRT in case the signal handler returns, which would
then generate the coredump + terminate the process.
However, if a SIGABRT is received from somewhere else (killall -SIGABRT
osmo-bsc), then the process would print the talloc report and continue
running, which is not desired.

Change-Id: I125288283af630efa20d64505e319636964a0982
Fixes: OS#4865
---
M src/osmo-bsc/osmo_bsc_main.c
1 file changed, 13 insertions(+), 5 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/osmo-bsc refs/changes/36/21336/1

diff --git a/src/osmo-bsc/osmo_bsc_main.c b/src/osmo-bsc/osmo_bsc_main.c
index aa45bf0..4ac2953 100644
--- a/src/osmo-bsc/osmo_bsc_main.c
+++ b/src/osmo-bsc/osmo_bsc_main.c
@@ -682,11 +682,11 @@
 };
 
 extern int bsc_shutdown_net(struct gsm_network *net);
-static void signal_handler(int signal)
+static void signal_handler(int signum)
 {
-	fprintf(stdout, "signal %u received\n", signal);
+	fprintf(stdout, "signal %u received\n", signum);
 
-	switch (signal) {
+	switch (signum) {
 	case SIGINT:
 	case SIGTERM:
 		bsc_shutdown_net(bsc_gsmnet);
@@ -695,8 +695,16 @@
 		exit(0);
 		break;
 	case SIGABRT:
-		/* in case of abort, we want to obtain a talloc report
-		 * and then return to the caller, who will abort the process */
+		/* in case of abort, we want to obtain a talloc report and
+		 * then run default SIGABRT handler, who will generate coredump
+		 * and abort the process. abort() should do this for us after we
+		 * return, but program wouldn't exit if an external SIGABRT is
+		 * received.
+		 */
+		talloc_report(tall_vty_ctx, stderr);
+		talloc_report_full(tall_bsc_ctx, stderr);
+		signal(SIGABRT, SIG_DFL);
+		raise(SIGABRT);
 	case SIGUSR1:
 		talloc_report(tall_vty_ctx, stderr);
 		talloc_report_full(tall_bsc_ctx, stderr);

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Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Change-Id: I125288283af630efa20d64505e319636964a0982
Gerrit-Change-Number: 21336
Gerrit-PatchSet: 1
Gerrit-Owner: pespin <pespin at sysmocom.de>
Gerrit-MessageType: newchange
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