1 files changed, 63 insertions, 0 deletions

diff --git a/lib/cloexec.c b/lib/cloexec.c
new file mode 100644
index 0000000..20f30db
--- /dev/null
+++ b/lib/cloexec.c
@@ -0,0 +1,63 @@
+/* closexec.c - set or clear the close-on-exec descriptor flag
+   Copyright (C) 1991, 2004 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+   The code is taken from glibc/manual/llio.texi  */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "cloexec.h"
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#if HAVE_FCNTL_H
+# include <fcntl.h>
+#endif
+
+#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 true on success, or false on error with `errno' set. */
+
+bool
+set_cloexec_flag (int desc, bool value)
+{
+#if defined F_GETFD && defined F_SETFD
+
+  int flags = fcntl (desc, F_GETFD, 0);
+  int newflags;
+
+  if (flags < 0)
+    return false;
+
+  newflags = (value ? flags | FD_CLOEXEC : flags & ~FD_CLOEXEC);
+
+  return (flags == newflags
+          || fcntl (desc, F_SETFD, newflags) != -1);
+
+#else
+
+  return true;
+
+#endif
+}