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| 1 | /* Message-writing for the dynamic linker. Generic version. |
|---|---|
| 2 | Copyright (C) 2013-2022 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/uio.h> |
| 20 | #include <ldsodefs.h> |
| 21 | #include <libc-lock.h> |
| 22 | |
| 23 | /* This is used from only one place: dl-misc.c:_dl_debug_vdprintf. |
| 24 | Hence it's in a header with the expectation it will be inlined. |
| 25 | |
| 26 | This is writev, but with a constraint added and others loosened: |
| 27 | |
| 28 | 1. Under RTLD_PRIVATE_ERRNO, it must not clobber the private errno |
| 29 | when another thread holds the dl_load_lock. |
| 30 | 2. It is not obliged to detect and report errors at all. |
| 31 | 3. It's not really obliged to deliver a single atomic write |
| 32 | (though it may be preferable). */ |
| 33 | |
| 34 | static inline void |
| 35 | _dl_writev (int fd, const struct iovec *iov, size_t niov) |
| 36 | { |
| 37 | /* Note that if __writev is an implementation that calls malloc, |
| 38 | this will cause linking problems building the dynamic linker. */ |
| 39 | |
| 40 | #if RTLD_PRIVATE_ERRNO |
| 41 | /* We have to take this lock just to be sure we don't clobber the private |
| 42 | errno when it's being used by another thread that cares about it. |
| 43 | Yet we must be sure not to try calling the lock functions before |
| 44 | the thread library is fully initialized. */ |
| 45 | if (__glibc_unlikely (_dl_starting_up)) |
| 46 | __writev (fd, iov, niov); |
| 47 | else |
| 48 | { |
| 49 | __rtld_lock_lock_recursive (GL(dl_load_lock)); |
| 50 | __writev (fd, iov, niov); |
| 51 | __rtld_lock_unlock_recursive (GL(dl_load_lock)); |
| 52 | } |
| 53 | #else |
| 54 | __writev (fd, iov, niov); |
| 55 | #endif |
| 56 | } |
| 57 |
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