1  /* write with error checking and retries.
       2     Copyright (C) 2016-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <support/xunistd.h>
      20  
      21  #include <support/check.h>
      22  
      23  void
      24  xwrite (int fd, const void *buffer, size_t length)
      25  {
      26    const char *p = buffer;
      27    const char *end = p + length;
      28    while (p < end)
      29      {
      30        ssize_t ret = write (fd, p, end - p);
      31        if (ret < 0)
      32          FAIL_EXIT1 ("write of %zu bytes failed after %td: %m",
      33                      length, p - (const char *) buffer);
      34        if (ret == 0)
      35          FAIL_EXIT1 ("write return 0 after writing %td bytes of %zu",
      36                      p - (const char *) buffer, length);
      37        p += ret;
      38      }
      39  }