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57 lines
2.2 KiB
C
57 lines
2.2 KiB
C
/* Message-writing for the dynamic linker. Generic version.
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Copyright (C) 2013-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sys/uio.h>
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#include <ldsodefs.h>
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#include <bits/libc-lock.h>
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/* This is used from only one place: dl-misc.c:_dl_debug_vdprintf.
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Hence it's in a header with the expectation it will be inlined.
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This is writev, but with a constraint added and others loosened:
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1. Under RTLD_PRIVATE_ERRNO, it must not clobber the private errno
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when another thread holds the dl_load_lock.
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2. It is not obliged to detect and report errors at all.
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3. It's not really obliged to deliver a single atomic write
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(though it may be preferable). */
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static inline void
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_dl_writev (int fd, const struct iovec *iov, size_t niov)
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{
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/* Note that if __writev is an implementation that calls malloc,
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this will cause linking problems building the dynamic linker. */
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#if RTLD_PRIVATE_ERRNO
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/* We have to take this lock just to be sure we don't clobber the private
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errno when it's being used by another thread that cares about it.
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Yet we must be sure not to try calling the lock functions before
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the thread library is fully initialized. */
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if (__builtin_expect (INTUSE (_dl_starting_up), 0))
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__writev (fd, iov, niov);
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else
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{
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__rtld_lock_lock_recursive (GL(dl_load_lock));
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__writev (fd, iov, niov);
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__rtld_lock_unlock_recursive (GL(dl_load_lock));
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}
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#else
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__writev (fd, iov, niov);
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#endif
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}
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