Change in osmocom-bb[master]: trxcon: generate coredump and exit upon SIGABRT received

[laforge]

laforge has submitted this change. ( https://gerrit.osmocom.org/c/osmocom-bb/+/21348 )

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

trxcon: 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 (kill -SIGABRT),
then the process would print the talloc report and continue running,
which is not desired.

Change-Id: I6d80f3f2742d397e47f4f2970c951f2cf6d58172
Fixes: OS#4865
---
M src/host/trxcon/trxcon.c
1 file changed, 13 insertions(+), 3 deletions(-)

Approvals:
  Jenkins Builder: Verified
  laforge: Looks good to me, approved



diff --git a/src/host/trxcon/trxcon.c b/src/host/trxcon/trxcon.c
index e14e2c9..158e27f 100644
--- a/src/host/trxcon/trxcon.c
+++ b/src/host/trxcon/trxcon.c
@@ -241,15 +241,25 @@
 	app_data.quit = 0;
 }
 
-static void signal_handler(int signal)
+static void signal_handler(int signum)
 {
-	fprintf(stderr, "signal %u received\n", signal);
+	fprintf(stderr, "signal %u received\n", signum);
 
-	switch (signal) {
+	switch (signum) {
 	case SIGINT:
 		app_data.quit++;
 		break;
 	case SIGABRT:
+		/* 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_full(tall_trxcon_ctx, stderr);
+		signal(SIGABRT, SIG_DFL);
+		raise(SIGABRT);
+		break;
 	case SIGUSR1:
 	case SIGUSR2:
 		talloc_report_full(tall_trxcon_ctx, stderr);

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Gerrit-Project: osmocom-bb
Gerrit-Branch: master
Gerrit-Change-Id: I6d80f3f2742d397e47f4f2970c951f2cf6d58172
Gerrit-Change-Number: 21348
Gerrit-PatchSet: 2
Gerrit-Owner: pespin <pespin at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-MessageType: merged
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