From fc00c656c96528112d05cf0edf8631bd5eaea446 Mon Sep 17 00:00:00 2001
From: Kacper <kacper@mail.openlinux.dev>
Date: Sun, 7 Dec 2025 20:10:31 +0100
Subject: Add build system scaffolding and libc headers

---
 lib/libc/signal/sigaddset.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 lib/libc/signal/sigaddset.c

(limited to 'lib/libc/signal/sigaddset.c')

diff --git a/lib/libc/signal/sigaddset.c b/lib/libc/signal/sigaddset.c
new file mode 100644
index 00000000..33e74bd0
--- /dev/null
+++ b/lib/libc/signal/sigaddset.c
@@ -0,0 +1,10 @@
+#include <signal.h>
+
+int sigaddset(sigset_t *set, int signo)
+{
+	if (signo < 1 || signo > 64) {
+		return -1;
+	}
+	*set |= (1ULL << (signo - 1));
+	return 0;
+}
-- 
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