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603ae243 | 1 | /* Copy a file from one path to another. |
2b778ceb | 2 | Copyright (C) 2020-2021 Free Software Foundation, Inc. |
603ae243 FW |
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 <fcntl.h> | |
20 | #include <support/check.h> | |
21 | #include <support/support.h> | |
22 | #include <support/xunistd.h> | |
23 | ||
24 | void | |
25 | support_copy_file (const char *from, const char *to) | |
26 | { | |
27 | struct stat64 st; | |
28 | xstat (from, &st); | |
29 | int fd_from = xopen (from, O_RDONLY, 0); | |
30 | mode_t mode = st.st_mode & 0777; | |
31 | int fd_to = xopen (to, O_WRONLY | O_TRUNC | O_CREAT, mode); | |
32 | ssize_t ret = support_copy_file_range (fd_from, NULL, fd_to, NULL, | |
33 | st.st_size, 0); | |
34 | if (ret < 0) | |
35 | FAIL_EXIT1 ("copying from \"%s\" to \"%s\": %m", from, to); | |
36 | if (ret != st.st_size) | |
37 | FAIL_EXIT1 ("copying from \"%s\" to \"%s\": only %zd of %llu bytes copied", | |
38 | from, to, ret, (unsigned long long int) st.st_size); | |
39 | if (fchmod (fd_to, mode) < 0) | |
40 | FAIL_EXIT1 ("fchmod on %s to 0%o: %m", to, mode); | |
41 | xclose (fd_to); | |
42 | xclose (fd_from); | |
43 | } |