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Fix sigwait namespace (bug 21550)

sigwait was added to POSIX in 1995; it is not in older POSIX versions
or XPG4 / XPG4.2.  Thus it should be declared only if
__USE_POSIX199506; signal.h wrongly declares it for __USE_POSIX.
(sigwaitinfo is correctly conditioned on __USE_POSIX199309.)  This
patch fixes the condition on the declaration of sigwait.

Tested for x86_64.  Because of other namespace problems this does not
allow any conform/ XFAILs to be removed.

2017-06-05  Joseph Myers  <>

	[BZ #21550]
	* signal/signal.h (sigwait): Only declare if [__USE_POSIX199506].

diff --git a/signal/signal.h b/signal/signal.h
index b311473..dbe3029 100644
--- a/signal/signal.h
+++ b/signal/signal.h
@@ -240,12 +240,14 @@ extern int sigaction (int __sig, const struct sigaction *__restrict __act,
 extern int sigpending (sigset_t *__set) __THROW __nonnull ((1));
+# ifdef __USE_POSIX199506
 /* Select any of pending signals from SET or wait for any to arrive.
    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern int sigwait (const sigset_t *__restrict __set, int *__restrict __sig)
      __nonnull ((1, 2));
+# endif /* Use POSIX 1995.  */
 # ifdef __USE_POSIX199309
 /* Select any of pending signals from SET and place information in INFO.

Joseph S. Myers

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