1 files changed, 48 insertions, 0 deletions
diff --git a/src/signal/sigaction.c b/src/signal/sigaction.c
new file mode 100644
index 00000000..4acd1730
--- /dev/null
+++ b/src/signal/sigaction.c
@@ -0,0 +1,48 @@
+#include <stdlib.h>
+#include <signal.h>
+#include <errno.h>
+#include "syscall.h"
+#include "pthread_impl.h"
+
+static void restorer()
+{
+	syscall0(__NR_rt_sigreturn);
+}
+
+int __libc_sigaction(int sig, const struct sigaction *sa, struct sigaction *old)
+{
+	struct {
+		void *handler;
+		unsigned long flags;
+		void (*restorer)(void);
+		sigset_t mask;
+	} ksa, kold;
+	long pksa=0, pkold=0;
+	if (sa) {
+		ksa.handler = sa->sa_handler;
+		ksa.flags = sa->sa_flags;
+		ksa.restorer = restorer;
+		ksa.mask = sa->sa_mask;
+		pksa = (long)&ksa;
+	}
+	if (old) pkold = (long)&kold;
+	if (syscall4(__NR_rt_sigaction, sig, pksa, pkold, 8))
+		return -1;
+	if (old) {
+		old->sa_handler = kold.handler;
+		old->sa_flags = kold.flags;
+		old->sa_mask = kold.mask;
+	}
+	return 0;
+}
+
+int __sigaction(int sig, const struct sigaction *sa, struct sigaction *old)
+{
+	if (sig == SIGCANCEL || sig == SIGSYSCALL) {
+		errno = EINVAL;
+		return -1;
+	}
+	return __libc_sigaction(sig, sa, old);
+}
+
+weak_alias(__sigaction, sigaction);