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b31d4355ae
The generic version is parallel to _dl_writev. It cannot use _dl_writev directly because the errno value needs to be obtained under a lock. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/* Implementation of the _dl_write function. Generic version.
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Copyright (C) 2020 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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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <ldsodefs.h>
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#include <libc-lock.h>
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#include <sys/uio.h>
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ssize_t
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_dl_write (int fd, const void *buffer, size_t length)
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{
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struct iovec iov = { .iov_base = (void *) buffer, .iov_len = length };
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ssize_t ret;
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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 (__glibc_unlikely (_dl_starting_up))
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{
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ret = __writev (fd, &iov, 1);
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if (ret < 0)
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ret = -errno;
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}
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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, 1);
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if (ret < 0)
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ret = -errno;
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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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ret = __writev (fd, &iov, 1);
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if (ret < 0)
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ret = -errno;
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#endif
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return ret;
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}
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