From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001
From: Vladimir Azarov <avm@intermediate-node.net>
Date: Tue, 1 Oct 2024 15:47:05 +0200
Subject: Initial version

---
 src/signal/sigaltstack.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 src/signal/sigaltstack.c

(limited to 'src/signal/sigaltstack.c')

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);
+}
-- 
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