nptl: SIGCANCEL, SIGTIMER, SIGSETXID are always defined

All nptl targets have these signal definitions nowadays.  This
changes also replaces the nptl-generic version of pthread_sigmask
with the Linux version.

Tested on x86_64-linux-gnu and i686-linux-gnu.  Built with
build-many-glibcs.py.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

1 files changed, 29 insertions, 11 deletions

diff --git a/nptl/pthread_sigmask.c b/nptl/pthread_sigmask.c
index c8df527995..4aa774d01d 100644
--- a/nptl/pthread_sigmask.c
+++ b/nptl/pthread_sigmask.c
@@ -1,6 +1,6 @@
-/* Examine and change blocked signals for a thread.  Generic POSIX version.
-   Copyright (C) 2014-2019 Free Software Foundation, Inc.
+/* Copyright (C) 2002-2019 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
 
    The GNU C Library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -19,18 +19,36 @@
 #include <errno.h>
 #include <signal.h>
 #include <pthreadP.h>
+#include <sysdep.h>
 
-#if defined SIGCANCEL || defined SIGTIMER || defined SIGSETXID
-# error "This implementation assumes no internal-only signal numbers."
-#endif
 
 int
 pthread_sigmask (int how, const sigset_t *newmask, sigset_t *oldmask)
 {
-  /* Here we assume that sigprocmask actually does everything right.
-     The only difference is the return value protocol.  */
-  int result = sigprocmask (how, newmask, oldmask);
-  if (result < 0)
-    result = errno;
-  return result;
+  sigset_t local_newmask;
+
+  /* The only thing we have to make sure here is that SIGCANCEL and
+     SIGSETXID is not blocked.  */
+  if (newmask != NULL
+      && (__builtin_expect (__sigismember (newmask, SIGCANCEL), 0)
+	  || __builtin_expect (__sigismember (newmask, SIGSETXID), 0)))
+    {
+      local_newmask = *newmask;
+      __sigdelset (&local_newmask, SIGCANCEL);
+      __sigdelset (&local_newmask, SIGSETXID);
+      newmask = &local_newmask;
+    }
+
+#ifdef INTERNAL_SYSCALL
+  /* We know that realtime signals are available if NPTL is used.  */
+  INTERNAL_SYSCALL_DECL (err);
+  int result = INTERNAL_SYSCALL (rt_sigprocmask, err, 4, how, newmask,
+				 oldmask, _NSIG / 8);
+
+  return (INTERNAL_SYSCALL_ERROR_P (result, err)
+	  ? INTERNAL_SYSCALL_ERRNO (result, err)
+	  : 0);
+#else
+  return sigprocmask (how, newmask, oldmask) == -1 ? errno : 0;
+#endif
 }