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-rw-r--r--libc/signal/sigintr.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libc/signal/sigintr.c b/libc/signal/sigintr.c
index 23f87e199..1a8d60eb2 100644
--- a/libc/signal/sigintr.c
+++ b/libc/signal/sigintr.c
@@ -34,6 +34,7 @@ int siginterrupt (int sig, int interrupt)
#ifdef SA_RESTART
struct sigaction action;
+ /* Fails if sig is bad. */
if (sigaction (sig, NULL, &action) < 0)
return -1;