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glibc/elf/dl-writev.h
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/* Message-writing for the dynamic linker. Generic version. | |
Copyright (C) 2013-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <sys/uio.h> | |
#include <ldsodefs.h> | |
#include <libc-lock.h> | |
/* This is used from only one place: dl-misc.c:_dl_debug_vdprintf. | |
Hence it's in a header with the expectation it will be inlined. | |
This is writev, but with a constraint added and others loosened: | |
1. Under RTLD_PRIVATE_ERRNO, it must not clobber the private errno | |
when another thread holds the dl_load_lock. | |
2. It is not obliged to detect and report errors at all. | |
3. It's not really obliged to deliver a single atomic write | |
(though it may be preferable). */ | |
static inline void | |
_dl_writev (int fd, const struct iovec *iov, size_t niov) | |
{ | |
/* Note that if __writev is an implementation that calls malloc, | |
this will cause linking problems building the dynamic linker. */ | |
#if RTLD_PRIVATE_ERRNO | |
/* We have to take this lock just to be sure we don't clobber the private | |
errno when it's being used by another thread that cares about it. | |
Yet we must be sure not to try calling the lock functions before | |
the thread library is fully initialized. */ | |
if (__glibc_unlikely (_dl_starting_up)) | |
__writev (fd, iov, niov); | |
else | |
{ | |
__rtld_lock_lock_recursive (GL(dl_load_lock)); | |
__writev (fd, iov, niov); | |
__rtld_lock_unlock_recursive (GL(dl_load_lock)); | |
} | |
#else | |
__writev (fd, iov, niov); | |
#endif | |
} |