1 files changed, 26 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/x86_64/sigaction.c b/mdk-stage1/dietlibc/x86_64/sigaction.c
new file mode 100644
index 000000000..18f32efde
--- /dev/null
+++ b/mdk-stage1/dietlibc/x86_64/sigaction.c
@@ -0,0 +1,26 @@
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syscalls.h>
+
+int __rt_sigaction(int signum, const struct sigaction *act, struct sigaction *oldact, long nr);
+
+static void restore_rt(void) {
+  asm volatile ("syscall" : : "a" (__NR_rt_sigreturn));
+}
+
+int __libc_sigaction(int signum, const struct sigaction *act, struct sigaction *oldact);
+int __libc_sigaction(int signum, const struct sigaction *act, struct sigaction *oldact) {
+  struct sigaction *newact = (struct sigaction *)act;
+  if (act) {
+	newact = alloca(sizeof(*newact));
+	newact->sa_handler = act->sa_handler;
+	newact->sa_flags = act->sa_flags | SA_RESTORER;
+	newact->sa_restorer = &restore_rt;
+	newact->sa_mask = act->sa_mask;
+  }
+  return __rt_sigaction(signum, newact, oldact, _NSIG/8);
+}
+
+int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact)
+__attribute__((weak,alias("__libc_sigaction")));