1 files changed, 53 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/sigreturn.c b/sysdeps/unix/sysv/linux/sigreturn.c
new file mode 100644
index 0000000000..e57ac74212
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sigreturn.c
@@ -0,0 +1,53 @@
+/* Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <signal.h>
+#include <sigcontext.h>
+#include <unistd.h>
+
+extern int __syscall_sigreturn (struct sigcontext *);
+extern int __syscall_rt_sigreturn (struct sigcontext *, size_t);
+
+/* The variable is shared between all wrappers around signal handling
+   functions which have RT equivalents.  It is defined in sigsuspend.c.  */
+extern int __libc_have_rt_sigs;
+
+
+/* Get and/or change the set of blocked signals.  */
+int
+__sigreturn (scp)
+     struct sigcontext *scp;
+{
+  /* First try the RT signals.  */
+  if (__libc_have_rt_sigs)
+    {
+      /* XXX The size argument hopefully will have to be changed to the
+	 real size of the user-level sigset_t.  */
+      int result = __syscall_rt_sigreturn (scp,
+					   _NSIG / (8 * sizeof (long int)));
+
+      if (result >= 0 || errno != ENOSYS)
+	return result;
+
+      __libc_have_rt_sigs = 0;
+    }
+
+  return __syscall_sigreturn (scp);
+}
+weak_alias (__sigprocmask, sigprocmask)