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/* Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "mysys_priv.h"
#include "my_sys.h"
#include "mysys_err.h"
#include <errno.h>
#include "my_thread_local.h"
/**
Write a chunk of bytes to a file
if (MyFlags & (MY_NABP | MY_FNABP))
@returns
0 if Count == 0
On succes, 0
On failure, (size_t)-1 == MY_FILE_ERROR
otherwise
@returns
0 if Count == 0
On success, the number of bytes written.
On partial success (if less than Count bytes could be written),
the actual number of bytes written.
On failure, (size_t)-1 == MY_FILE_ERROR
*/
size_t my_write(File Filedes, const uchar *Buffer, size_t Count, myf MyFlags)
{
size_t writtenbytes;
size_t sum_written= 0;
uint errors= 0;
const size_t initial_count= Count;
DBUG_ENTER("my_write");
DBUG_PRINT("my",("fd: %d Buffer: %p Count: %lu MyFlags: %d",
Filedes, Buffer, (ulong) Count, MyFlags));
/* The behavior of write(fd, buf, 0) is not portable */
if (unlikely(!Count))
DBUG_RETURN(0);
DBUG_EXECUTE_IF ("simulate_no_free_space_error",
{ DBUG_SET("+d,simulate_file_write_error");});
for (;;)
{
errno= 0;
#ifdef _WIN32
writtenbytes= my_win_write(Filedes, Buffer, Count);
#else
writtenbytes= write(Filedes, Buffer, Count);
#endif
DBUG_EXECUTE_IF("simulate_file_write_error",
{
errno= ENOSPC;
writtenbytes= (size_t) -1;
});
if (writtenbytes == Count)
{
sum_written+= writtenbytes;
break;
}
if (writtenbytes != (size_t) -1)
{ /* Safeguard */
sum_written+= writtenbytes;
Buffer+= writtenbytes;
Count-= writtenbytes;
}
set_my_errno(errno);
DBUG_PRINT("error",("Write only %ld bytes, error: %d",
(long) writtenbytes, my_errno()));
if (is_killed_hook(NULL))
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++;
DBUG_EXECUTE_IF("simulate_no_free_space_error",
{ DBUG_SET("-d,simulate_file_write_error");});
continue;
}
if (writtenbytes != 0 && writtenbytes != (size_t) -1)
continue; /* Retry if something written */
else if (my_errno() == EINTR)
{
DBUG_PRINT("debug", ("my_write() was interrupted and returned %ld",
(long) writtenbytes));
continue; /* Interrupted, retry */
}
else if (writtenbytes == 0 && !errors++) /* Retry once */
{
/* We may come here if the file quota is exeeded */
continue;
}
break;
}
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(0), my_filename(Filedes),
my_errno(), my_strerror(errbuf, sizeof(errbuf), my_errno()));
}
DBUG_RETURN(MY_FILE_ERROR);
}
if (sum_written == 0)
DBUG_RETURN(MY_FILE_ERROR);
DBUG_RETURN(sum_written);
} /* my_write */
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