size_t my_pwrite(File Filedes, const uchar *Buffer, size_t Count,
my_off_t offset, myf MyFlags)
{
size_t writtenbytes, written;
uint errors;
DBUG_ENTER("my_pwrite");
DBUG_PRINT("my",("fd: %d Seek: %llu Buffer: %p Count: %lu MyFlags: %d",
Filedes, offset, Buffer, (ulong)Count, MyFlags));
errors= 0;
written= 0;
for (;;)
{
#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)
break;
my_errno= errno;
if (writtenbytes != (size_t) -1)
{
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 && writtenbytes != (size_t) -1) || my_errno == EINTR)
continue; /* Retry */
#endif
if (MyFlags & (MY_NABP | MY_FNABP))
{
if (MyFlags & (MY_WME | MY_FAE | MY_FNABP))
{
my_error(EE_WRITE, MYF(ME_BELL | ME_WAITTANG),
my_filename(Filedes),my_errno);
}
DBUG_RETURN(MY_FILE_ERROR); /* Error on read */
}
else
break; /* Return bytes written */
}
DBUG_EXECUTE_IF("check", my_seek(Filedes, -1, SEEK_SET, MYF(0)););
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 (_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));
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)
{
continue; /* Retry */
}
else if (writtenbytes == 0 && !errors++) /* Retry once */
{
/* We may come here if the file quota is exeeded */
continue;
}
break; /* Return bytes written */
}
if (MyFlags & (MY_NABP | MY_FNABP))
{
if (sum_written == initial_count)
DBUG_RETURN(0); /* Want only errors, not bytes written */
if (MyFlags & (MY_WME | MY_FAE | MY_FNABP))
{
char errbuf[MYSYS_STRERROR_SIZE];
my_error(EE_WRITE, MYF(ME_BELL | ME_WAITTANG), my_filename(Filedes),
my_errno, my_strerror(errbuf, sizeof(errbuf), my_errno));
}
DBUG_RETURN(MY_FILE_ERROR);
}
DBUG_EXECUTE_IF("check", my_seek(Filedes, -1, SEEK_SET, MYF(0)););
