utils-std

commit: aee69b2cb95047c6d1cb4c75440e6cfb151c1718
parent 973ec0b44f5079cfefae84abb25f5b4b42bf693e
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date:   Sun, 30 Nov 2025 07:46:31 +0100

cmd/time: define a no-op handler for SIGCHLD

Diffstat:
M
cmd/time.c
21
+++++++++++++++++++++

1 file changed, 21 insertions(+), 0 deletions(-)
diff --git a/cmd/time.c b/cmd/time.c
@@ -28,6 +28,17 @@ enum cmd_time_mode
 	CMD_TIME_VERBOSE = 1,
 };
 
+/*
+ * no-op signal handler so sigprocmask/sigwait works on BSDs where signals
+ * that are ignored/discarded by default aren't blocked unless they
+ * have a handler
+ */
+static void
+sig_noop(int sig)
+{
+	return;
+}
+
 static void
 usage(void)
 {
@@ -89,6 +100,16 @@ main(int argc, char *argv[])
 	sigset_t sigset;
 	if(sigfillset(&sigset) != 0) return 1;
 
+	struct sigaction sa = {
+		.sa_handler = &sig_noop,
+		.sa_flags = 0,
+	};
+	if(sigaction(SIGCHLD, &sa, NULL) != 0)
+	{
+		fprintf(stderr, "time: error: Failed setting SIGCHLD handler: %s\n", strerror(errno));
+		return 1;
+	}
+
 	if(sigprocmask(SIG_BLOCK, &sigset, NULL) != 0)
 	{
 		fprintf(stderr, "time: error: Failed setting process' signal mask: %s\n", strerror(errno));