1 | /* Implementation of the _dl_write function. Generic version. |
2 | Copyright (C) 2020-2022 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 <errno.h> |
20 | #include <ldsodefs.h> |
21 | #include <libc-lock.h> |
22 | #include <sys/uio.h> |
23 | |
24 | ssize_t |
25 | _dl_write (int fd, const void *buffer, size_t length) |
26 | { |
27 | struct iovec iov = { .iov_base = (void *) buffer, .iov_len = length }; |
28 | ssize_t ret; |
29 | |
30 | #if RTLD_PRIVATE_ERRNO |
31 | /* We have to take this lock just to be sure we don't clobber the private |
32 | errno when it's being used by another thread that cares about it. |
33 | Yet we must be sure not to try calling the lock functions before |
34 | the thread library is fully initialized. */ |
35 | if (__glibc_unlikely (_dl_starting_up)) |
36 | { |
37 | ret = __writev (fd, &iov, 1); |
38 | if (ret < 0) |
39 | ret = -errno; |
40 | } |
41 | else |
42 | { |
43 | __rtld_lock_lock_recursive (GL(dl_load_lock)); |
44 | ret = __writev (fd, &iov, 1); |
45 | if (ret < 0) |
46 | ret = -errno; |
47 | __rtld_lock_unlock_recursive (GL(dl_load_lock)); |
48 | } |
49 | #else |
50 | ret = __writev (fd, &iov, 1); |
51 | if (ret < 0) |
52 | ret = -errno; |
53 | #endif |
54 | |
55 | return ret; |
56 | } |
57 | |