improve sigsetjmp testHEADmaster

previously failure to save the signal mask was not being caught due to
the uninitialized buffer containing zero bits (by chance).

1 files changed, 4 insertions, 0 deletions

diff --git a/setjmp.c b/setjmp.c
index 6728bef..b740be5 100644
--- a/setjmp.c
+++ b/setjmp.c
@@ -40,6 +40,10 @@ int test_setjmp(void)
 	sigprocmask(SIG_UNBLOCK, &set, &set);
 	oldset = set;
 
+	/* Improve the chances of catching failure of sigsetjmp to
+	 * properly save the signal mask in the sigjmb_buf. */
+	memset(&sjb, -1, sizeof sjb);
+
 	if (!sigsetjmp(sjb, 1)) {
 		sigemptyset(&set);
 		sigaddset(&set, SIGUSR1);