Add build system scaffolding and libc headers

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/libc/signal/sigprocmask.c b/lib/libc/signal/sigprocmask.c
new file mode 100644
index 00000000..54063b9d
--- /dev/null
+++ b/lib/libc/signal/sigprocmask.c
@@ -0,0 +1,17 @@
+#include <signal.h>
+#include <syscall.h>
+
+int sigprocmask(int how, const sigset_t *restrict set, sigset_t *restrict oset)
+{
+	long ret;
+	sigset_t oldset = { 0 };
+
+	ret = syscall(rt_sigprocmask, how, set, &oldset, sizeof(sigset_t));
+
+	if (ret < 0)
+		return -1;
+
+	if (oset)
+		*oset = oldset;
+	return 0;
+}