Add build system scaffolding and libc headers

1 files changed, 23 insertions, 0 deletions

diff --git a/lib/libc/signal/pthread_sigmask.c b/lib/libc/signal/pthread_sigmask.c
new file mode 100644
index 00000000..1b83e1fe
--- /dev/null
+++ b/lib/libc/signal/pthread_sigmask.c
@@ -0,0 +1,23 @@
+#include <errno.h>
+#include <asm-generic/signal.h>
+#include <libc.h>
+
+int sigdelset(sigset_t *, int);
+int sigismember(const sigset_t *, int);
+int sigprocmask(int, const sigset_t *restrict, sigset_t *restrict);
+
+int pthread_sigmask(int how, const sigset_t *restrict set,
+		    sigset_t *restrict oset)
+{
+	sigset_t lset;
+
+	if (set != NULL && (unlikely(sigismember(set, SIGRTMIN)) ||
+			    unlikely(sigismember(set, SIGRTMIN + 1)))) {
+		lset = *set;
+		sigdelset(&lset, SIGRTMIN);
+		sigdelset(&lset, SIGRTMIN + 1);
+		set = &lset;
+	}
+
+	return sigprocmask(how, set, oset) == -1 ? errno : 0;
+}