| Absolute File Name: | /home/opencoverage/opencoverage/guest-scripts/coreutils/src/gnulib/lib/save-cwd.c |
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|---|---|---|---|---|---|---|---|---|
| 1 | /* save-cwd.c -- Save and restore current working directory. | - | ||||||
| 2 | - | |||||||
| 3 | Copyright (C) 1995, 1997-1998, 2003-2006, 2009-2018 Free Software | - | ||||||
| 4 | Foundation, Inc. | - | ||||||
| 5 | - | |||||||
| 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. | - | ||||||
| 10 | - | |||||||
| 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. | - | ||||||
| 15 | - | |||||||
| 16 | You should have received a copy of the GNU General Public License | - | ||||||
| 17 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ | - | ||||||
| 18 | - | |||||||
| 19 | /* Written by Jim Meyering. */ | - | ||||||
| 20 | - | |||||||
| 21 | #include <config.h> | - | ||||||
| 22 | - | |||||||
| 23 | #include "save-cwd.h" | - | ||||||
| 24 | - | |||||||
| 25 | #include <errno.h> | - | ||||||
| 26 | #include <fcntl.h> | - | ||||||
| 27 | #include <stdbool.h> | - | ||||||
| 28 | #include <stdio.h> | - | ||||||
| 29 | #include <stdlib.h> | - | ||||||
| 30 | - | |||||||
| 31 | #include "chdir-long.h" | - | ||||||
| 32 | #include "unistd--.h" | - | ||||||
| 33 | - | |||||||
| 34 | #if GNULIB_FCNTL_SAFER | - | ||||||
| 35 | # include "fcntl--.h" | - | ||||||
| 36 | #else | - | ||||||
| 37 | # define GNULIB_FCNTL_SAFER 0 | - | ||||||
| 38 | #endif | - | ||||||
| 39 | - | |||||||
| 40 | /* Record the location of the current working directory in CWD so that | - | ||||||
| 41 | the program may change to other directories and later use restore_cwd | - | ||||||
| 42 | to return to the recorded location. This function may allocate | - | ||||||
| 43 | space using malloc (via getcwd) or leave a file descriptor open; | - | ||||||
| 44 | use free_cwd to perform the necessary free or close. Upon failure, | - | ||||||
| 45 | no memory is allocated, any locally opened file descriptors are | - | ||||||
| 46 | closed; return non-zero -- in that case, free_cwd need not be | - | ||||||
| 47 | called, but doing so is ok. Otherwise, return zero. | - | ||||||
| 48 | - | |||||||
| 49 | The _raison d'etre_ for this interface is that the working directory | - | ||||||
| 50 | is sometimes inaccessible, and getcwd is not robust or as efficient. | - | ||||||
| 51 | So, we prefer to use the open/fchdir approach, but fall back on | - | ||||||
| 52 | getcwd if necessary. This module works for most cases with just | - | ||||||
| 53 | the getcwd-lgpl module, but to be truly robust, use the getcwd module. | - | ||||||
| 54 | - | |||||||
| 55 | Some systems lack fchdir altogether: e.g., OS/2, pre-2001 Cygwin, | - | ||||||
| 56 | SCO Xenix. Also, SunOS 4 and Irix 5.3 provide the function, yet it | - | ||||||
| 57 | doesn't work for partitions on which auditing is enabled. If | - | ||||||
| 58 | you're still using an obsolete system with these problems, please | - | ||||||
| 59 | send email to the maintainer of this code. */ | - | ||||||
| 60 | - | |||||||
| 61 | int | - | ||||||
| 62 | save_cwd (struct saved_cwd *cwd) | - | ||||||
| 63 | { | - | ||||||
| 64 | cwd->name = NULL; | - | ||||||
| 65 | - | |||||||
| 66 | cwd->desc = open (".", O_SEARCH | O_CLOEXEC); | - | ||||||
| 67 | if (!GNULIB_FCNTL_SAFER)
dead code: cwd->desc = fd_safer_flag (cwd->desc, 02000000 ); | - | ||||||
| 68 | cwd->desc = fd_safer_flag (cwd->desc, O_CLOEXEC); dead code: cwd->desc = fd_safer_flag (cwd->desc, 02000000 ); | - | ||||||
| 69 | if (cwd->desc < 0)
| 0-6 | ||||||
| 70 | { | - | ||||||
| 71 | cwd->name = getcwd (NULL, 0); | - | ||||||
| 72 | return cwd->name ? 0 : -1; never executed: return cwd->name ? 0 : -1; | 0 | ||||||
| 73 | } | - | ||||||
| 74 | - | |||||||
| 75 | return 0; executed 6 times by 2 tests: return 0;Executed by:
| 6 | ||||||
| 76 | } | - | ||||||
| 77 | - | |||||||
| 78 | /* Change to recorded location, CWD, in directory hierarchy. | - | ||||||
| 79 | Upon failure, return -1 (errno is set by chdir or fchdir). | - | ||||||
| 80 | Upon success, return zero. */ | - | ||||||
| 81 | - | |||||||
| 82 | int | - | ||||||
| 83 | restore_cwd (const struct saved_cwd *cwd) | - | ||||||
| 84 | { | - | ||||||
| 85 | if (0 <= cwd->desc)
| 0-6 | ||||||
| 86 | return fchdir (cwd->desc); executed 6 times by 2 tests: return fchdir (cwd->desc);Executed by:
| 6 | ||||||
| 87 | else | - | ||||||
| 88 | return chdir_long (cwd->name); never executed: return chdir_long (cwd->name); | 0 | ||||||
| 89 | } | - | ||||||
| 90 | - | |||||||
| 91 | void | - | ||||||
| 92 | free_cwd (struct saved_cwd *cwd) | - | ||||||
| 93 | { | - | ||||||
| 94 | if (cwd->desc >= 0)
| 0-6 | ||||||
| 95 | close (cwd->desc); executed 6 times by 2 tests: close (cwd->desc);Executed by:
| 6 | ||||||
| 96 | free (cwd->name); | - | ||||||
| 97 | } executed 6 times by 2 tests: end of blockExecuted by:
| 6 | ||||||
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