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/sigismember.c | 8 ++++++++
 1 file changed, 8 insertions(+)
 create mode 100644 src/signal/sigismember.c

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

diff --git a/src/signal/sigismember.c b/src/signal/sigismember.c
new file mode 100644
index 0000000..ab87d62
--- /dev/null
+++ b/src/signal/sigismember.c
@@ -0,0 +1,8 @@
+#include <signal.h>
+
+int sigismember(const sigset_t *set, int sig)
+{
+	unsigned s = sig-1;
+	if (s >= _NSIG-1) return 0;
+	return !!(set->__bits[s/8/sizeof *set->__bits] & 1UL<<(s&8*sizeof *set->__bits-1));
+}
-- 
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