sigaction overhaul as described in docs/sigaction.txt

Run tested on i386.

1 files changed, 10 insertions, 37 deletions

diff --git a/libc/sysdeps/linux/xtensa/sigaction.c b/libc/sysdeps/linux/xtensa/sigaction.c
index 123cb5085..302d13305 100644
--- a/libc/sysdeps/linux/xtensa/sigaction.c
+++ b/libc/sysdeps/linux/xtensa/sigaction.c
@@ -15,52 +15,25 @@
 
 #define SA_RESTORER	0x04000000
 
-extern void __default_sa_restorer (void);
+extern void __default_sa_restorer(void);
 
-/* Experimentally off - libc_hidden_proto(memcpy) */
-
-int __libc_sigaction (int signum, const struct sigaction *act,
+int __libc_sigaction(int sig, const struct sigaction *act,
 					  struct sigaction *oact)
 {
-	struct kernel_sigaction kact, koact;
-	int result;
-	enum {
-		SIGSET_MIN_SIZE = sizeof(kact.sa_mask) < sizeof(act->sa_mask)
-				? sizeof(kact.sa_mask) : sizeof(act->sa_mask)
-	};
-
-	if (act) {
-		kact.k_sa_handler = act->sa_handler;
-		memcpy(&kact.sa_mask, &act->sa_mask, SIGSET_MIN_SIZE);
-		kact.sa_flags = act->sa_flags;
+	struct sigaction kact;
 
-		if (kact.sa_flags & SA_RESTORER) {
-			kact.sa_restorer = act->sa_restorer;
-		} else {
-			kact.sa_restorer = __default_sa_restorer;
-			kact.sa_flags |= SA_RESTORER;
-		}
+	if (act && !(act->sa_flags & SA_RESTORER)) {
+		memcpy(&kact, act, sizeof(kact));
+		kact.sa_restorer = __default_sa_restorer;
+		kact.sa_flags |= SA_RESTORER;
+		act = &kact;
 	}
-
 	/* NB: kernel (as of 2.6.25) will return EINVAL
-	 * if sizeof(kact.sa_mask) does not match kernel's sizeof(sigset_t) */
-	result = __syscall_rt_sigaction(signum,
-			act ? &kact : NULL,
-			oact ? &koact : NULL,
-			sizeof(kact.sa_mask));
-
-	if (oact && result >= 0) {
-		oact->sa_handler = koact.k_sa_handler;
-		memcpy(&oact->sa_mask, &koact.sa_mask, SIGSET_MIN_SIZE);
-		oact->sa_flags = koact.sa_flags;
-		oact->sa_restorer = koact.sa_restorer;
-	}
-
-	return result;
+	 * if sizeof(act->sa_mask) does not match kernel's sizeof(sigset_t) */
+	return __syscall_rt_sigaction(sig, act, oact, sizeof(act->sa_mask));
 }
 
 #ifndef LIBC_SIGACTION
-libc_hidden_proto(sigaction)
 weak_alias(__libc_sigaction, sigaction)
 libc_hidden_weak(sigaction)
 #endif