1 files changed, 83 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/sigaction.c b/sysdeps/unix/sysv/sigaction.c
new file mode 100644
index 0000000000..ebb42cf756
--- /dev/null
+++ b/sysdeps/unix/sysv/sigaction.c
@@ -0,0 +1,83 @@
+/* Copyright (C) 1992, 1994, 1995 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., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <sysdep.h>
+#include <errno.h>
+#include <stddef.h>
+#include <signal.h>
+
+
+/* If ACT is not NULL, change the action for SIG to *ACT.
+   If OACT is not NULL, put the old action for SIG in *OACT.  */
+int
+DEFUN(__sigaction, (sig, act, oact),
+      int sig AND CONST struct sigaction *act AND struct sigaction *oact)
+{
+  sighandler_t handler;
+  int save;
+
+  if (sig <= 0 || sig >= NSIG)
+    {
+      errno = EINVAL;
+      return -1;
+    }
+
+  if (act == NULL)
+    {
+      if (oact == NULL)
+	return 0;
+      /* Race condition, but this is the only way to do it.  */
+      handler = signal (sig, SIG_IGN);
+      if (handler == SIG_ERR)
+	return -1;
+      save = errno;
+      (void) signal (sig, handler);
+      errno = save;
+    }
+  else
+    {
+      int i;
+
+      if (act->sa_flags != 0)
+	{
+	unimplemented:
+	  errno = ENOSYS;
+	  return -1;
+	}
+
+      for (i = 1; i < NSIG; ++i)
+	if (__sigismember (&act->sa_mask, i))
+	  goto unimplemented;
+
+      handler = signal (sig, act->sa_handler);
+      if (handler == SIG_ERR)
+	return -1;
+    }
+
+  if (oact != NULL)
+    {
+      oact->sa_handler = handler;
+      __sigemptyset (&oact->sa_mask);
+      oact->sa_flags = 0;
+    }
+
+  return 0;
+}
+
+weak_alias (__sigaction, sigaction)