Initial version

1 files changed, 18 insertions, 0 deletions

diff --git a/src/signal/sigaltstack.c b/src/signal/sigaltstack.c
new file mode 100644
index 0000000..d3a6e82
--- /dev/null
+++ b/src/signal/sigaltstack.c
@@ -0,0 +1,18 @@
+#include <signal.h>
+#include <errno.h>
+#include "syscall.h"
+
+int sigaltstack(const stack_t *restrict ss, stack_t *restrict old)
+{
+	if (ss) {
+		if (!(ss->ss_flags & SS_DISABLE) && ss->ss_size < MINSIGSTKSZ) {
+			errno = ENOMEM;
+			return -1;
+		}
+		if (ss->ss_flags & SS_ONSTACK) {
+			errno = EINVAL;
+			return -1;
+		}
+	}
+	return syscall(SYS_sigaltstack, ss, old);
+}