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authorRich Felker <dalias@aerifal.cx>2011-03-10 10:17:29 -0500
committerRich Felker <dalias@aerifal.cx>2011-03-10 10:17:29 -0500
commit6871fd773dcedbf056317d5d5e87b4859e97c4a4 (patch)
tree94431cd8088870491de1d5e82a380aca96c28920
parent1b538acb0ac8520a8a5fd828add2e52e1d2a41eb (diff)
downloadmusl-6871fd773dcedbf056317d5d5e87b4859e97c4a4.tar.gz
make sigaltstack work (missing macros in signal.h, error conditions)
-rw-r--r--arch/i386/bits/signal.h2
-rw-r--r--arch/x86_64/bits/signal.h2
-rw-r--r--src/signal/sigaltstack.c12
3 files changed, 15 insertions, 1 deletions
diff --git a/arch/i386/bits/signal.h b/arch/i386/bits/signal.h
index 4956a0d9..74d9d025 100644
--- a/arch/i386/bits/signal.h
+++ b/arch/i386/bits/signal.h
@@ -131,6 +131,8 @@ struct __siginfo
#define POLL_HUP 6
#define SS_ONSTACK 1
#define SS_DISABLE 2
+#define MINSIGSTKSZ 2048
+#define SIGSTKSZ 8192
#endif
#define SA_NOCLDSTOP 1
diff --git a/arch/x86_64/bits/signal.h b/arch/x86_64/bits/signal.h
index f2c92d09..ddebe90d 100644
--- a/arch/x86_64/bits/signal.h
+++ b/arch/x86_64/bits/signal.h
@@ -137,6 +137,8 @@ struct __siginfo
#define POLL_HUP 6
#define SS_ONSTACK 1
#define SS_DISABLE 2
+#define MINSIGSTKSZ 2048
+#define SIGSTKSZ 8192
#endif
#define SA_NOCLDSTOP 1
diff --git a/src/signal/sigaltstack.c b/src/signal/sigaltstack.c
index 3cc2d456..6e46d098 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)
{
- /* depends on kernel struct matching */
+ if (ss) {
+ if (ss->ss_size < MINSIGSTKSZ) {
+ errno = ENOMEM;
+ return -1;
+ }
+ if (ss->ss_flags & ~SS_DISABLE) {
+ errno = EINVAL;
+ return -1;
+ }
+ }
return syscall2(__NR_sigaltstack, (long)ss, (long)old);
}