1 | /* Truncate a file given by name. Generic POSIX.1 version. |
2 | Copyright (C) 1995-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <sys/types.h> |
20 | #include <errno.h> |
21 | #include <unistd.h> |
22 | #include <fcntl.h> |
23 | |
24 | /* Truncate PATH to LENGTH bytes. */ |
25 | int |
26 | __truncate (const char *path, off_t length) |
27 | { |
28 | int fd, ret, save; |
29 | |
30 | fd = __open (path, O_WRONLY | (length == 0 ? O_TRUNC : 0)); |
31 | if (fd < 0) |
32 | return -1; |
33 | |
34 | if (length == 0) |
35 | ret = 0; |
36 | else |
37 | ret = __ftruncate (fd: fd, length: length); |
38 | save = errno; |
39 | (void) __close (fd); |
40 | if (ret < 0) |
41 | __set_errno (save); |
42 | return ret; |
43 | } |
44 | weak_alias (__truncate, truncate) |
45 | |