From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001
From: Vladimir Azarov <avm@intermediate-node.net>
Date: Tue, 1 Oct 2024 15:47:05 +0200
Subject: Initial version

---
 src/signal/sigaddset.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 src/signal/sigaddset.c

(limited to 'src/signal/sigaddset.c')

diff --git a/src/signal/sigaddset.c b/src/signal/sigaddset.c
new file mode 100644
index 0000000..085d1f4
--- /dev/null
+++ b/src/signal/sigaddset.c
@@ -0,0 +1,13 @@
+#include <signal.h>
+#include <errno.h>
+
+int sigaddset(sigset_t *set, int sig)
+{
+	unsigned s = sig-1;
+	if (s >= _NSIG-1 || sig-32U < 3) {
+		errno = EINVAL;
+		return -1;
+	}
+	set->__bits[s/8/sizeof *set->__bits] |= 1UL<<(s&8*sizeof *set->__bits-1);
+	return 0;
+}
-- 
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