Function my_pwrite

mysys/my_pread.c:170–258

*/

size_t my_pwrite(File Filedes, const uchar *Buffer, size_t Count,
                 my_off_t offset, myf MyFlags)
{
  size_t writtenbytes;
  size_t sum_written= 0;
  uint errors= 0;
  const size_t initial_count= Count;

  DBUG_ENTER("my_pwrite");
  DBUG_PRINT("my",("fd: %d  Seek: %llu  Buffer: %p  Count: %lu  MyFlags: %d",
             Filedes, offset, Buffer, (ulong)Count, MyFlags));

  for (;;)
  {
    errno= 0;
#if !defined (HAVE_PREAD) && !defined (_WIN32)
    int error;
    writtenbytes= (size_t) -1;
    mysql_mutex_lock(&my_file_info[Filedes].mutex);
    error= (lseek(Filedes, offset, MY_SEEK_SET) != (my_off_t) -1 &&
            (writtenbytes= write(Filedes, Buffer, Count)) == Count);
    mysql_mutex_unlock(&my_file_info[Filedes].mutex);
    if (error)
      break;
#elif defined (_WIN32)
    writtenbytes= my_win_pwrite(Filedes, Buffer, Count, offset);
#else
    writtenbytes= pwrite(Filedes, Buffer, Count, offset);
#endif
    if(writtenbytes == Count)
    {
      sum_written+= writtenbytes;
      break;
    }
    my_errno= errno;
    if (writtenbytes != (size_t) -1)
    {
      sum_written+= writtenbytes;
      Buffer+= writtenbytes;
      Count-= writtenbytes;
      offset+= writtenbytes;
    }
    DBUG_PRINT("error",("Write only %u bytes", (uint) writtenbytes));
#ifndef NO_BACKGROUND

    if (my_thread_var->abort)
      MyFlags&= ~ MY_WAIT_IF_FULL;		/* End if aborted by user */

    if ((my_errno == ENOSPC || my_errno == EDQUOT) &&
        (MyFlags & MY_WAIT_IF_FULL))
    {
      wait_for_free_space(my_filename(Filedes), errors);
      errors++;
      continue;
    }
    if (writtenbytes != 0 && writtenbytes != (size_t) -1)
      continue;
    else if (my_errno == EINTR)