/* Implementation of the _dl_write function.  Generic version.

   Copyright (C) 2020 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

   <https://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <ldsodefs.h>

#include <libc-lock.h>

#include <sys/uio.h>

ssize_t

_dl_write (int fd, const void *buffer, size_t length)

{

  struct iovec iov = { .iov_base = (void *) buffer, .iov_len = length };

  ssize_t ret;

#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))

    {

      ret = __writev (fd, &iov, 1);

      if (ret < 0)

        ret = -errno;

    }

  else

    {

      __rtld_lock_lock_recursive (GL(dl_load_lock));

      __writev (fd, &iov, 1);

      if (ret < 0)

        ret = -errno;

      __rtld_lock_unlock_recursive (GL(dl_load_lock));

    }

#else

  ret = __writev (fd, &iov, 1);

  if (ret < 0)

    ret = -errno;

#endif

  return ret;

}