diff options
Diffstat (limited to 'gl/open.c')
| -rw-r--r-- | gl/open.c | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/gl/open.c b/gl/open.c deleted file mode 100644 index f612b802..00000000 --- a/gl/open.c +++ /dev/null @@ -1,166 +0,0 @@ -/* Open a descriptor to a file. - 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 - the Free Software Foundation; either version 3 of the License, 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, see <http://www.gnu.org/licenses/>. */ - -/* Written by Bruno Haible <bruno@clisp.org>, 2007. */ - -#include <config.h> - -/* Get the original definition of open. It might be defined as a macro. */ -#define __need_system_fcntl_h -#include <fcntl.h> -#undef __need_system_fcntl_h -#include <sys/types.h> - -static inline int -orig_open (const char *filename, int flags, mode_t mode) -{ - return open (filename, flags, mode); -} - -/* Specification. */ -#include <fcntl.h> - -#include <errno.h> -#include <stdarg.h> -#include <string.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <unistd.h> - -#ifndef REPLACE_OPEN_DIRECTORY -# define REPLACE_OPEN_DIRECTORY 0 -#endif - -int -open (const char *filename, int flags, ...) -{ - mode_t mode; - int fd; - - mode = 0; - if (flags & O_CREAT) - { - va_list arg; - va_start (arg, flags); - - /* 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 (strcmp (filename, "/dev/null") == 0) - filename = "NUL"; -#endif - -#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> - says that - "A pathname that contains at least one non-slash character and that - ends with one or more trailing slashes shall be resolved as if a - single dot character ( '.' ) were appended to the pathname." - and - "The special filename dot shall refer to the directory specified by - its predecessor." - If the named file already exists as a directory, then - - if O_CREAT is specified, open() must fail because of the semantics - of O_CREAT, - - if O_WRONLY or O_RDWR is specified, open() must fail because POSIX - <http://www.opengroup.org/susv3/functions/open.html> says that it - fails with errno = EISDIR in this case. - If the named file does not exist or does not name a directory, then - - if O_CREAT is specified, open() must fail since open() cannot create - directories, - - if O_WRONLY or O_RDWR is specified, open() must fail because the - file does not contain a '.' directory. */ - if (flags & (O_CREAT | O_WRONLY | O_RDWR)) - { - size_t len = strlen (filename); - if (len > 0 && filename[len - 1] == '/') - { - errno = EISDIR; - return -1; - } - } -#endif - - fd = orig_open (filename, flags, mode); - -#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> - says that - "A pathname that contains at least one non-slash character and that - ends with one or more trailing slashes shall be resolved as if a - single dot character ( '.' ) were appended to the pathname." - and - "The special filename dot shall refer to the directory specified by - its predecessor." - If the named file without the slash is not a directory, open() must fail - with ENOTDIR. */ - if (fd >= 0) - { - /* We know len is positive, since open did not fail with ENOENT. */ - size_t len = strlen (filename); - if (filename[len - 1] == '/') - { - struct stat statbuf; - - if (fstat (fd, &statbuf) >= 0 && !S_ISDIR (statbuf.st_mode)) - { - close (fd); - errno = ENOTDIR; - return -1; - } - } - } -#endif - -#if REPLACE_FCHDIR - if (!REPLACE_OPEN_DIRECTORY && 0 <= fd) - fd = _gl_register_fd (fd, filename); -#endif - - return fd; -} |