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46 lines
1.7 KiB
C
46 lines
1.7 KiB
C
/* Message-writing for the dynamic linker. NaCl version.
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Copyright (C) 2015 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 <nacl-interfaces.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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for (size_t i = 0; i < niov; ++i)
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{
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size_t wrote;
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if (__nacl_irt_fdio.write (fd, iov[i].iov_base, iov[i].iov_len,
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&wrote) != 0
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|| wrote != iov[i].iov_len)
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/* The write failed, so don't bother trying any more. */
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break;
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}
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}
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