From 17130d83b48ce257ed9bc5bb2898d44c01ab82c0 Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Thu, 13 Aug 2020 19:31:50 -0400
Subject: basic implementation

---
 src/signal/sigismember.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

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

diff --git a/src/signal/sigismember.c b/src/signal/sigismember.c
index 5e21cb5c..6d3c1512 100644
--- a/src/signal/sigismember.c
+++ b/src/signal/sigismember.c
@@ -1,9 +1,16 @@
 #include "sys/types.h"
 #include <signal.h>
+#include "limits.h"
 
 int sigismember(const sigset_t * set, int signo)
 {
-	(void)set; (void)signo;
+	/* TODO: fail with EINVAL if signo is not a valid signal number */
+
+	size_t byte = signo % CHAR_BIT;
+	int bit = signo / CHAR_BIT;
+	if (set->__bits[byte] & (1 << bit)) {
+		return 1;
+	}
 	return 0;
 }
 /*
-- 
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