X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fsignal%2Fsigaltstack.c;h=d3a6e8215f83c3d0a8038a6d0eee2bc228b104e5;hb=0c277ff156749628c678257f878d3a6edb5868de;hp=3cc2d456b3bb572a6dc6af926b6a4ddc6a198762;hpb=0b44a0315b47dd8eced9f3b7f31580cf14bbfc01;p=musl

diff --git a/src/signal/sigaltstack.c b/src/signal/sigaltstack.c
index 3cc2d456..d3a6e821 100644
--- a/src/signal/sigaltstack.c
+++ b/src/signal/sigaltstack.c
@@ -1,8 +1,18 @@
 #include <signal.h>
+#include <errno.h>
 #include "syscall.h"
 
-int sigaltstack(const stack_t *ss, stack_t *old)
+int sigaltstack(const stack_t *restrict ss, stack_t *restrict old)
 {
-	/* depends on kernel struct matching */
-	return syscall2(__NR_sigaltstack, (long)ss, (long)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);
 }