Catch failures when installing signal handlers

Stop ignoring the return codes from sigaction() and signal().  Unlikely to
happen in practice, but if it ever did it could lead to really hard to
debug problems.  So, take clang-tidy's advice and check for errors here.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/passt.c b/passt.c
index f0ed897..4796c89 100644
--- a/passt.c
+++ b/passt.c
@@ -201,8 +201,10 @@ int main(int argc, char **argv)
 	name = basename(argv0);
 	if (strstr(name, "pasta")) {
 		sa.sa_handler = pasta_child_handler;
-		sigaction(SIGCHLD, &sa, NULL);
-		signal(SIGPIPE, SIG_IGN);
+		if (sigaction(SIGCHLD, &sa, NULL) || signal(SIGPIPE, SIG_IGN)) {
+			err("Couldn't install signal handlers");
+			exit(EXIT_FAILURE);
+		}
 
 		c.mode = MODE_PASTA;
 		log_name = "pasta";