sparc sigaction.c: fix the noted bugs by syncing up with glibc

Signed-off-by: Austin Foxley <austinf@cetoncorp.com>

libc/sysdeps/linux/sparc/sigaction.c

@@ -37,46 +37,32 @@ static void __sigreturn_stub(void);
 int __libc_sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
 {
 	int ret;
-	struct old_kernel_sigaction kact, koact;
+	struct sigaction kact, koact;
 	unsigned long stub = 0;
-	int saved_errno = errno;
 
 	if (act) {
-		kact.k_sa_handler = act->sa_handler;
-		/* BUG?! kact.sa_mask is a long, but sigset_t is a vector
-		/* of longs and it may be bigger (in glibc, it _is_ bigger).
-		/* Should we do this instead?
-		/* kact.sa_mask = act->sa_mask.__val[0]; */
-		memcpy(&kact.sa_mask, &act->sa_mask, sizeof(sigset_t));
-		kact.sa_flags = act->sa_flags;
-		if (kact.sa_flags & SA_SIGINFO)
+		kact.sa_handler = act->sa_handler;
+		memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
+		if (((kact.sa_flags = act->sa_flags) & SA_SIGINFO) != 0)
 			stub = (unsigned long) &__rt_sigreturn_stub;
 		else
 			stub = (unsigned long) &__sigreturn_stub;
 		stub -= 8;
 		kact.sa_restorer = NULL;
 	}
-	/* NB: kernel (as of 2.6.25) will return EINVAL
-	 * if _NSIG / 8 does not match kernel's sizeof(sigset_t) */
-	ret = rt_sigaction(sig,
-		(int)(act ? &kact : NULL),
-		(int)(oact ? &koact : NULL),
-		stub,
-		_NSIG / 8);
-
-	/* BUG?! if ret == -1, we return -1 but do not set errno?! */
-	if (ret >= 0 || errno != ENOSYS) {
-		if (oact && ret >= 0) {
-			oact->sa_handler = koact.k_sa_handler;
-			/* maybe oact->sa_mask.__val[0] = koact.sa_mask;? */
-			memcpy(&oact->sa_mask, &koact.sa_mask, sizeof(sigset_t));
-			oact->sa_flags = koact.sa_flags;
-			oact->sa_restorer = koact.sa_restorer;
-		}
-		return ret;
+	
+	/* XXX The size argument hopefully will have to be changed to the
+	 * real size of the user-level sigset_t.  */
+	ret = INLINE_SYSCALL (rt_sigaction, 5, sig, act ? &kact : 0,
+			oact ? &koact : 0, stub, _NSIG / 8);
+	
+	if (oact && ret >= 0) {
+		oact->sa_handler = koact.sa_handler;
+		memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
+		oact->sa_flags = koact.sa_flags;
+		oact->sa_restorer = koact.sa_restorer;
 	}
-	__set_errno(saved_errno);
-	return -1;
+	return ret;
 }
 
 #ifndef LIBC_SIGACTION