update from main archive 960105 cvs/libc-970107 cvs/libc-970106

1 files changed, 58 insertions, 0 deletions

diff --git a/sysdeps/posix/sysv_signal.c b/sysdeps/posix/sysv_signal.c
new file mode 100644
index 0000000000..2b6d5f9d56
--- /dev/null
+++ b/sysdeps/posix/sysv_signal.c
@@ -0,0 +1,58 @@
+/* Copyright (C) 1991, 1992, 1996, 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>
+
+/* Tolerate non-threads versions of Posix */
+#ifndef SA_ONESHOT
+#define SA_ONESHOT 0
+#endif
+#ifndef SA_NOMASK
+#define SA_NOMASK 0
+#endif
+#ifndef SA_INTERRUPT
+#define SA_INTERRUPT 0
+#endif
+
+/* Set the handler for the signal SIG to HANDLER,
+   returning the old handler, or SIG_ERR on error.  */
+__sighandler_t
+__sysv_signal (sig, handler)
+     int sig;
+     __sighandler_t handler;
+{
+  struct sigaction act, oact;
+
+  /* Check signal extents to protect __sigismember.  */
+  if (handler == SIG_ERR || sig < 1 || sig >= NSIG)
+    {
+      __set_errno (EINVAL);
+      return SIG_ERR;
+    }
+
+  act.sa_handler = handler;
+  if (__sigemptyset (&act.sa_mask) < 0)
+    return SIG_ERR;
+  act.sa_flags = SA_ONESHOT | SA_NOMASK | SA_INTERRUPT;
+  act.sa_flags &= ~SA_RESTART;
+  if (__sigaction (sig, &act, &oact) < 0)
+    return SIG_ERR;
+
+  return oact.sa_handler;
+}