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authorRich Felker <dalias@aerifal.cx>2011-02-12 00:22:29 -0500
committerRich Felker <dalias@aerifal.cx>2011-02-12 00:22:29 -0500
commit0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 (patch)
tree6eaef0d8a720fa3da580de87b647fff796fe80b3 /src/signal/sigismember.c
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initial check-in, version 0.5.0 v0.5.0
Diffstat (limited to 'src/signal/sigismember.c')
-rw-r--r--src/signal/sigismember.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/src/signal/sigismember.c b/src/signal/sigismember.c
new file mode 100644
index 00000000..afd29e52
--- /dev/null
+++ b/src/signal/sigismember.c
@@ -0,0 +1,12 @@
+#include <signal.h>
+#include <errno.h>
+
+int sigismember(const sigset_t *set, int sig)
+{
+	unsigned s = sig-1;
+	if (s >= 8*sizeof(sigset_t)) {
+		errno = EINVAL;
+		return -1;
+	}
+	return !!(set->__bits[s/8/sizeof *set->__bits] & 1UL<<(s&8*sizeof *set->__bits-1));
+}