musl - musl - an implementation of the standard library for Linux-based systems

diff --git a/src/signal/sigaddset.c b/src/signal/sigaddset.c
new file mode 100644
index 00000000..23e655db
--- /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 >= 8*sizeof(sigset_t)) {

+ errno = EINVAL;

+ return -1;

+ }

+ set->__bits[s/8/sizeof *set->__bits] |= 1UL<<(s&8*sizeof *set->__bits-1);

+ return 0;

+}