1 /* -*- buffer-read-only: t -*- vi: set ro: */
2 /* DO NOT EDIT! GENERATED AUTOMATICALLY! */
3 /* Open a descriptor to a file.
4 Copyright (C) 2007-2011 Free Software Foundation, Inc.
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
23 /* Get the original definition of open. It might be defined as a macro. */
24 #define __need_system_fcntl_h
26 #undef __need_system_fcntl_h
27 #include <sys/types.h>
30 orig_open (const char *filename, int flags, mode_t mode)
32 return open (filename, flags, mode);
41 #include <sys/types.h>
45 #ifndef REPLACE_OPEN_DIRECTORY
46 # define REPLACE_OPEN_DIRECTORY 0
50 open (const char *filename, int flags, ...)
59 va_start (arg, flags);
61 /* We have to use PROMOTED_MODE_T instead of mode_t, otherwise GCC 4
62 creates crashing code when 'mode_t' is smaller than 'int'. */
63 mode = va_arg (arg, PROMOTED_MODE_T);
68 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
69 if (strcmp (filename, "/dev/null") == 0)
73 #if OPEN_TRAILING_SLASH_BUG
74 /* If the filename ends in a slash and one of O_CREAT, O_WRONLY, O_RDWR
75 is specified, then fail.
76 Rationale: POSIX <http://www.opengroup.org/susv3/basedefs/xbd_chap04.html>
78 "A pathname that contains at least one non-slash character and that
79 ends with one or more trailing slashes shall be resolved as if a
80 single dot character ( '.' ) were appended to the pathname."
82 "The special filename dot shall refer to the directory specified by
84 If the named file already exists as a directory, then
85 - if O_CREAT is specified, open() must fail because of the semantics
87 - if O_WRONLY or O_RDWR is specified, open() must fail because POSIX
88 <http://www.opengroup.org/susv3/functions/open.html> says that it
89 fails with errno = EISDIR in this case.
90 If the named file does not exist or does not name a directory, then
91 - if O_CREAT is specified, open() must fail since open() cannot create
93 - if O_WRONLY or O_RDWR is specified, open() must fail because the
94 file does not contain a '.' directory. */
95 if (flags & (O_CREAT | O_WRONLY | O_RDWR))
97 size_t len = strlen (filename);
98 if (len > 0 && filename[len - 1] == '/')
106 fd = orig_open (filename, flags, mode);
109 /* Implementing fchdir and fdopendir requires the ability to open a
110 directory file descriptor. If open doesn't support that (as on
111 mingw), we use a dummy file that behaves the same as directories
112 on Linux (ie. always reports EOF on attempts to read()), and
113 override fstat() in fchdir.c to hide the fact that we have a
115 if (REPLACE_OPEN_DIRECTORY && fd < 0 && errno == EACCES
116 && ((flags & O_ACCMODE) == O_RDONLY
117 || (O_SEARCH != O_RDONLY && (flags & O_ACCMODE) == O_SEARCH)))
120 if (stat (filename, &statbuf) == 0 && S_ISDIR (statbuf.st_mode))
122 /* Maximum recursion depth of 1. */
123 fd = open ("/dev/null", flags, mode);
125 fd = _gl_register_fd (fd, filename);
132 #if OPEN_TRAILING_SLASH_BUG
133 /* If the filename ends in a slash and fd does not refer to a directory,
135 Rationale: POSIX <http://www.opengroup.org/susv3/basedefs/xbd_chap04.html>
137 "A pathname that contains at least one non-slash character and that
138 ends with one or more trailing slashes shall be resolved as if a
139 single dot character ( '.' ) were appended to the pathname."
141 "The special filename dot shall refer to the directory specified by
143 If the named file without the slash is not a directory, open() must fail
147 /* We know len is positive, since open did not fail with ENOENT. */
148 size_t len = strlen (filename);
149 if (filename[len - 1] == '/')
153 if (fstat (fd, &statbuf) >= 0 && !S_ISDIR (statbuf.st_mode))
164 if (!REPLACE_OPEN_DIRECTORY && 0 <= fd)
165 fd = _gl_register_fd (fd, filename);