diff options
Diffstat (limited to 'tests/fchdir.c')
| -rw-r--r-- | tests/fchdir.c | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/tests/fchdir.c b/tests/fchdir.c deleted file mode 100644 index 5ac2f096..00000000 --- a/tests/fchdir.c +++ /dev/null @@ -1,204 +0,0 @@ -/* fchdir replacement. - Copyright (C) 2006-2024 Free Software Foundation, Inc. - - This file is free software: you can redistribute it and/or modify - it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation, either version 3 of the - License, or (at your option) any later version. - - This file 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 Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with this program. If not, see <https://www.gnu.org/licenses/>. */ - -#include <config.h> - -/* Specification. */ -#include <unistd.h> - -#include <dirent.h> -#include <errno.h> -#include <fcntl.h> -#include <stdlib.h> -#include <string.h> -#include <sys/types.h> -#include <sys/stat.h> - -#include "assure.h" -#include "filename.h" -#include "filenamecat.h" - -#ifndef REPLACE_OPEN_DIRECTORY -# define REPLACE_OPEN_DIRECTORY 0 -#endif - -/* This replacement assumes that a directory is not renamed while opened - through a file descriptor. - - FIXME: On mingw, this would be possible to enforce if we were to - also open a HANDLE to each directory currently visited by a file - descriptor, since mingw refuses to rename any in-use file system - object. */ - -/* Array of file descriptors opened. If REPLACE_OPEN_DIRECTORY or if it points - to a directory, it stores info about this directory. */ -typedef struct -{ - char *name; /* Absolute name of the directory, or NULL. */ -} dir_info_t; -static dir_info_t *dirs; -static size_t dirs_allocated; - -/* Try to ensure dirs has enough room for a slot at index fd; free any - contents already in that slot. Return false and set errno to - ENOMEM on allocation failure. */ -static bool -ensure_dirs_slot (size_t fd) -{ - if (fd < dirs_allocated) - free (dirs[fd].name); - else - { - size_t new_allocated; - dir_info_t *new_dirs; - - new_allocated = 2 * dirs_allocated + 1; - if (new_allocated <= fd) - new_allocated = fd + 1; - new_dirs = - (dirs != NULL - ? (dir_info_t *) realloc (dirs, new_allocated * sizeof *dirs) - : (dir_info_t *) malloc (new_allocated * sizeof *dirs)); - if (new_dirs == NULL) - return false; - memset (new_dirs + dirs_allocated, 0, - (new_allocated - dirs_allocated) * sizeof *dirs); - dirs = new_dirs; - dirs_allocated = new_allocated; - } - return true; -} - -/* Return an absolute name of DIR in malloc'd storage. - Upon failure, return NULL with errno set. */ -static char * -get_name (char const *dir) -{ - char *cwd; - char *result; - - if (IS_ABSOLUTE_FILE_NAME (dir)) - return strdup (dir); - - /* We often encounter "."; treat it as a special case. */ - cwd = getcwd (NULL, 0); - if (!cwd || (dir[0] == '.' && dir[1] == '\0')) - return cwd; - - result = mfile_name_concat (cwd, dir, NULL); - free (cwd); - return result; -} - -/* Hook into the gnulib replacements for open() and close() to keep track - of the open file descriptors. */ - -/* Close FD, cleaning up any fd to name mapping if fd was visiting a - directory. */ -void -_gl_unregister_fd (int fd) -{ - if (fd >= 0 && fd < dirs_allocated) - { - free (dirs[fd].name); - dirs[fd].name = NULL; - } -} - -/* Mark FD as visiting FILENAME. FD must be non-negative, and refer - to an open file descriptor. If REPLACE_OPEN_DIRECTORY is non-zero, - this should only be called if FD is visiting a directory. Close FD - and return -1 with errno set if there is insufficient memory to track - the directory name; otherwise return FD. */ -int -_gl_register_fd (int fd, const char *filename) -{ - struct stat statbuf; - - assure (0 <= fd); - if (REPLACE_OPEN_DIRECTORY - || (fstat (fd, &statbuf) == 0 && S_ISDIR (statbuf.st_mode))) - { - if (!ensure_dirs_slot (fd) - || (dirs[fd].name = get_name (filename)) == NULL) - { - int saved_errno = errno; - close (fd); - errno = saved_errno; - return -1; - } - } - return fd; -} - -/* Mark NEWFD as a duplicate of OLDFD; useful from dup, dup2, dup3, - and fcntl. Both arguments must be valid and distinct file - descriptors. Close NEWFD and return -1 if OLDFD is tracking a - directory, but there is insufficient memory to track the same - directory in NEWFD; otherwise return NEWFD. */ -int -_gl_register_dup (int oldfd, int newfd) -{ - assure (0 <= oldfd && 0 <= newfd && oldfd != newfd); - if (oldfd < dirs_allocated && dirs[oldfd].name) - { - /* Duplicated a directory; must ensure newfd is allocated. */ - if (!ensure_dirs_slot (newfd) - || (dirs[newfd].name = strdup (dirs[oldfd].name)) == NULL) - { - int saved_errno = errno; - close (newfd); - errno = saved_errno; - newfd = -1; - } - } - else if (newfd < dirs_allocated) - { - /* Duplicated a non-directory; ensure newfd is cleared. */ - free (dirs[newfd].name); - dirs[newfd].name = NULL; - } - return newfd; -} - -/* If FD is currently visiting a directory, then return the name of - that directory. Otherwise, return NULL and set errno. */ -const char * -_gl_directory_name (int fd) -{ - if (0 <= fd && fd < dirs_allocated && dirs[fd].name != NULL) - return dirs[fd].name; - /* At this point, fd is either invalid, or open but not a directory. - If dup2 fails, errno is correctly EBADF. */ - if (0 <= fd) - { - if (dup2 (fd, fd) == fd) - errno = ENOTDIR; - } - else - errno = EBADF; - return NULL; -} - - -/* Implement fchdir() in terms of chdir(). */ - -int -fchdir (int fd) -{ - const char *name = _gl_directory_name (fd); - return name ? chdir (name) : -1; -} |