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
__truncate(const char * path,off_t length)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, 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