| 1 | /* Copyright (C) 1997-2022 Free Software Foundation, Inc. |
|---|---|
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, see |
| 16 | <https://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #include <libc-lock.h> |
| 19 | #include <stdlib.h> |
| 20 | #include <string.h> |
| 21 | #include <utmp.h> |
| 22 | |
| 23 | #include "utmp-private.h" |
| 24 | |
| 25 | |
| 26 | /* This is the default name. */ |
| 27 | static const char default_file_name[] = _PATH_UTMP; |
| 28 | |
| 29 | /* Current file name. */ |
| 30 | const char *__libc_utmp_file_name = (const char *) default_file_name; |
| 31 | |
| 32 | /* We have to use the lock in getutent_r.c. */ |
| 33 | __libc_lock_define (extern, __libc_utmp_lock attribute_hidden) |
| 34 | |
| 35 | |
| 36 | int |
| 37 | __utmpname (const char *file) |
| 38 | { |
| 39 | int result = -1; |
| 40 | |
| 41 | __libc_lock_lock (__libc_utmp_lock); |
| 42 | |
| 43 | /* Close the old file. */ |
| 44 | __libc_endutent (); |
| 45 | |
| 46 | if (strcmp (file, __libc_utmp_file_name) != 0) |
| 47 | { |
| 48 | if (strcmp (file, default_file_name) == 0) |
| 49 | { |
| 50 | free (ptr: (char *) __libc_utmp_file_name); |
| 51 | |
| 52 | __libc_utmp_file_name = default_file_name; |
| 53 | } |
| 54 | else |
| 55 | { |
| 56 | char *file_name = __strdup (file); |
| 57 | if (file_name == NULL) |
| 58 | /* Out of memory. */ |
| 59 | goto done; |
| 60 | |
| 61 | if (__libc_utmp_file_name != default_file_name) |
| 62 | free (ptr: (char *) __libc_utmp_file_name); |
| 63 | |
| 64 | __libc_utmp_file_name = file_name; |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | result = 0; |
| 69 | |
| 70 | done: |
| 71 | __libc_lock_unlock (__libc_utmp_lock); |
| 72 | return result; |
| 73 | } |
| 74 | libc_hidden_def (__utmpname) |
| 75 | weak_alias (__utmpname, utmpname) |
| 76 |