+/* Open a descriptor to a file.
+ Copyright (C) 2007 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. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
+
+#include <config.h>
+
+/* Specification. */
+#include <fcntl.h>
+
+/* If the fchdir replacement is used, open() is defined in fchdir.c. */
+#ifndef FCHDIR_REPLACEMENT
+
+# include <stdarg.h>
+# include <string.h>
+# include <sys/types.h>
+# include <sys/stat.h>
+
+int
+open (const char *filename, int flags, ...)
+# undef open
+{
+ mode_t mode;
+
+ mode = 0;
+ if (flags & O_CREAT)
+ {
+ va_list arg;
+ va_start (arg, flags);
+
+ /* If mode_t is narrower than int, use the promoted type (int),
+ not mode_t. Use sizeof to guess whether mode_t is narrower;
+ we don't know of any practical counterexamples. */
+ mode = (sizeof (mode_t) < sizeof (int)
+ ? va_arg (arg, int)
+ : va_arg (arg, mode_t));
+
+ va_end (arg);
+ }
+
+# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+ if (strcmp (filename, "/dev/null") == 0)
+ filename = "NUL";
+# endif
+
+ return open (filename, flags, mode);
+}
+#endif