lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Message-writing for the dynamic linker. NaCl version. |
| 2 | Copyright (C) 2015 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 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <sys/uio.h> |
| 20 | #include <nacl-interfaces.h> |
| 21 | |
| 22 | /* This is used from only one place: dl-misc.c:_dl_debug_vdprintf. |
| 23 | Hence it's in a header with the expectation it will be inlined. |
| 24 | |
| 25 | This is writev, but with a constraint added and others loosened: |
| 26 | |
| 27 | 1. Under RTLD_PRIVATE_ERRNO, it must not clobber the private errno |
| 28 | when another thread holds the dl_load_lock. |
| 29 | 2. It is not obliged to detect and report errors at all. |
| 30 | 3. It's not really obliged to deliver a single atomic write |
| 31 | (though it may be preferable). */ |
| 32 | |
| 33 | static inline void |
| 34 | _dl_writev (int fd, const struct iovec *iov, size_t niov) |
| 35 | { |
| 36 | for (size_t i = 0; i < niov; ++i) |
| 37 | { |
| 38 | size_t wrote; |
| 39 | if (__nacl_irt_fdio.write (fd, iov[i].iov_base, iov[i].iov_len, |
| 40 | &wrote) != 0 |
| 41 | || wrote != iov[i].iov_len) |
| 42 | /* The write failed, so don't bother trying any more. */ |
| 43 | break; |
| 44 | } |
| 45 | } |