add simplified __sigemptyset for internal use

Use __sigemptyset instead of sigemptyset.
Remove hidden sigemptyset.

Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

include/signal.h

@@ -256,7 +256,6 @@ typedef __sighandler_t sig_t;
 
 /* Clear all signals from SET.  */
 extern int sigemptyset (sigset_t *__set) __THROW __nonnull ((1));
-libc_hidden_proto(sigemptyset)
 
 /* Set all signals in SET.  */
 extern int sigfillset (sigset_t *__set) __THROW __nonnull ((1));
@@ -484,6 +483,12 @@ extern int __libc_current_sigrtmin (void) __THROW;
 /* Return number of available real-time signal with lowest priority.  */
 extern int __libc_current_sigrtmax (void) __THROW;
 
+#ifdef _LIBC
+/* simplified version without parameter checking */
+# include <string.h>
+# undef __sigemptyset
+# define __sigemptyset(ss) (memset(ss, '\0', sizeof(sigset_t)), 0)
+#endif
 #endif /* signal.h  */
 
 __END_DECLS

libc/signal/sigempty.c

@@ -20,7 +20,6 @@
 #include <signal.h>
 #include <string.h>
 
-
 /* Clear all signals from SET.  */
 int sigemptyset (sigset_t *set)
 {
@@ -36,4 +35,3 @@ int sigemptyset (sigset_t *set)
 
   return 0;
 }
-libc_hidden_def(sigemptyset)

libpthread/nptl/sysdeps/unix/sysv/linux/timer_routines.c

@@ -49,7 +49,7 @@ timer_sigev_thread (void *arg)
      surprising for user code, although valid.  We unblock all
      signals.  */
   sigset_t ss;
-  sigemptyset (&ss);
+  __sigemptyset (&ss);
   INTERNAL_SYSCALL_DECL (err);
   INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, &ss, NULL, _NSIG / 8);
 
@@ -75,7 +75,7 @@ timer_helper_thread (void *arg)
   /* Wait for the SIGTIMER signal, allowing the setXid signal, and
      none else.  */
   sigset_t ss;
-  sigemptyset (&ss);
+  __sigemptyset (&ss);
   __sigaddset (&ss, SIGTIMER);
 
   /* Endless loop of waiting for signals.  The loop is only ended when