Sync with gnulib - lots of extraneous code removed in preference to GNU code

[nagiosplug.git] / gl / cloexec.c

diff --git a/gl/cloexec.c b/gl/cloexec.c
new file mode 100644 (file)
index 0000000..6480006
--- /dev/null
+++ b/gl/cloexec.c
@@ -0,0 +1,59 @@
+/* closexec.c - set or clear the close-on-exec descriptor flag
+
+   Copyright (C) 1991, 2004, 2005, 2006 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+   The code is taken from glibc/manual/llio.texi  */
+
+#include <config.h>
+
+#include "cloexec.h"
+
+#include <unistd.h>
+#include <fcntl.h>
+
+#ifndef FD_CLOEXEC
+# define FD_CLOEXEC 1
+#endif
+
+/* Set the `FD_CLOEXEC' flag of DESC if VALUE is true,
+   or clear the flag if VALUE is false.
+   Return 0 on success, or -1 on error with `errno' set. */
+
+int
+set_cloexec_flag (int desc, bool value)
+{
+#if defined F_GETFD && defined F_SETFD
+
+  int flags = fcntl (desc, F_GETFD, 0);
+
+  if (0 <= flags)
+    {
+      int newflags = (value ? flags | FD_CLOEXEC : flags & ~FD_CLOEXEC);
+
+      if (flags == newflags
+         || fcntl (desc, F_SETFD, newflags) != -1)
+       return 0;
+    }
+
+  return -1;
+
+#else
+
+  return 0;
+
+#endif
+}