/* Open a descriptor to a file.
- Copyright (C) 2007-2008 Free Software Foundation, Inc.
+ Copyright (C) 2007-2010 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
/* Specification. */
#include <fcntl.h>
-/* If the fchdir replacement is used, open() is defined in fchdir.c. */
-#ifndef FCHDIR_REPLACEMENT
+#include <errno.h>
+#include <stdarg.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
-# include <errno.h>
-# include <stdarg.h>
-# include <string.h>
-# include <sys/types.h>
-# include <sys/stat.h>
+#ifndef REPLACE_OPEN_DIRECTORY
+# define REPLACE_OPEN_DIRECTORY 0
+#endif
int
open (const char *filename, int flags, ...)
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));
+ /* We have to use PROMOTED_MODE_T instead of mode_t, otherwise GCC 4
+ creates crashing code when 'mode_t' is smaller than 'int'. */
+ mode = va_arg (arg, PROMOTED_MODE_T);
va_end (arg);
}
-# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
if (strcmp (filename, "/dev/null") == 0)
filename = "NUL";
-# endif
+#endif
-# if OPEN_TRAILING_SLASH_BUG
+#if OPEN_TRAILING_SLASH_BUG
/* If the filename ends in a slash and one of O_CREAT, O_WRONLY, O_RDWR
is specified, then fail.
Rationale: POSIX <http://www.opengroup.org/susv3/basedefs/xbd_chap04.html>
{
size_t len = strlen (filename);
if (len > 0 && filename[len - 1] == '/')
- {
- errno = EISDIR;
- return -1;
- }
+ {
+ errno = EISDIR;
+ return -1;
+ }
}
-# endif
+#endif
fd = orig_open (filename, flags, mode);
-# if OPEN_TRAILING_SLASH_BUG
+#if REPLACE_FCHDIR
+ /* Implementing fchdir and fdopendir requires the ability to open a
+ directory file descriptor. If open doesn't support that (as on
+ mingw), we use a dummy file that behaves the same as directories
+ on Linux (ie. always reports EOF on attempts to read()), and
+ override fstat() in fchdir.c to hide the fact that we have a
+ dummy. */
+ if (REPLACE_OPEN_DIRECTORY && fd < 0 && errno == EACCES
+ && (flags & O_ACCMODE) == O_RDONLY)
+ {
+ struct stat statbuf;
+ if (stat (filename, &statbuf) == 0 && S_ISDIR (statbuf.st_mode))
+ {
+ /* Maximum recursion depth of 1. */
+ fd = open ("/dev/null", flags, mode);
+ if (0 <= fd)
+ fd = _gl_register_fd (fd, filename);
+ }
+ else
+ errno = EACCES;
+ }
+#endif
+
+#if OPEN_TRAILING_SLASH_BUG
/* If the filename ends in a slash and fd does not refer to a directory,
then fail.
Rationale: POSIX <http://www.opengroup.org/susv3/basedefs/xbd_chap04.html>
with ENOTDIR. */
if (fd >= 0)
{
+ /* We know len is positive, since open did not fail with ENOENT. */
size_t len = strlen (filename);
- if (len > 0 && filename[len - 1] == '/')
- {
- struct stat statbuf;
-
- if (fstat (fd, &statbuf) >= 0 && !S_ISDIR (statbuf.st_mode))
- {
- close (fd);
- errno = ENOTDIR;
- return -1;
- }
- }
+ if (filename[len - 1] == '/')
+ {
+ struct stat statbuf;
+
+ if (fstat (fd, &statbuf) >= 0 && !S_ISDIR (statbuf.st_mode))
+ {
+ close (fd);
+ errno = ENOTDIR;
+ return -1;
+ }
+ }
}
-# endif
+#endif
+
+#if REPLACE_FCHDIR
+ if (!REPLACE_OPEN_DIRECTORY && 0 <= fd)
+ fd = _gl_register_fd (fd, filename);
+#endif
return fd;
}
-#endif