130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/* Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#include "mysys_priv.h"
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#include "my_sys.h"
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#include "mysys_err.h"
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#include <errno.h>
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#include "my_thread_local.h"
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/**
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Write a chunk of bytes to a file
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if (MyFlags & (MY_NABP | MY_FNABP))
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@returns
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0 if Count == 0
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On succes, 0
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On failure, (size_t)-1 == MY_FILE_ERROR
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otherwise
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@returns
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0 if Count == 0
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On success, the number of bytes written.
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On partial success (if less than Count bytes could be written),
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the actual number of bytes written.
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On failure, (size_t)-1 == MY_FILE_ERROR
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*/
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size_t my_write(File Filedes, const uchar *Buffer, size_t Count, myf MyFlags)
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{
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size_t writtenbytes;
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size_t sum_written= 0;
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uint errors= 0;
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const size_t initial_count= Count;
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DBUG_ENTER("my_write");
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DBUG_PRINT("my",("fd: %d Buffer: %p Count: %lu MyFlags: %d",
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Filedes, Buffer, (ulong) Count, MyFlags));
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/* The behavior of write(fd, buf, 0) is not portable */
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if (unlikely(!Count))
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DBUG_RETURN(0);
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DBUG_EXECUTE_IF ("simulate_no_free_space_error",
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{ DBUG_SET("+d,simulate_file_write_error");});
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for (;;)
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{
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errno= 0;
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#ifdef _WIN32
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writtenbytes= my_win_write(Filedes, Buffer, Count);
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#else
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writtenbytes= write(Filedes, Buffer, Count);
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#endif
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DBUG_EXECUTE_IF("simulate_file_write_error",
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{
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errno= ENOSPC;
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writtenbytes= (size_t) -1;
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});
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if (writtenbytes == Count)
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{
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sum_written+= writtenbytes;
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break;
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}
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if (writtenbytes != (size_t) -1)
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{ /* Safeguard */
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sum_written+= writtenbytes;
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Buffer+= writtenbytes;
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Count-= writtenbytes;
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}
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set_my_errno(errno);
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DBUG_PRINT("error",("Write only %ld bytes, error: %d",
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(long) writtenbytes, my_errno()));
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if (is_killed_hook(NULL))
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MyFlags&= ~ MY_WAIT_IF_FULL; /* End if aborted by user */
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if ((my_errno() == ENOSPC || my_errno() == EDQUOT) &&
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(MyFlags & MY_WAIT_IF_FULL))
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{
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wait_for_free_space(my_filename(Filedes), errors);
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errors++;
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DBUG_EXECUTE_IF("simulate_no_free_space_error",
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{ DBUG_SET("-d,simulate_file_write_error");});
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continue;
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}
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if (writtenbytes != 0 && writtenbytes != (size_t) -1)
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continue; /* Retry if something written */
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else if (my_errno() == EINTR)
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{
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DBUG_PRINT("debug", ("my_write() was interrupted and returned %ld",
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(long) writtenbytes));
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continue; /* Interrupted, retry */
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}
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else if (writtenbytes == 0 && !errors++) /* Retry once */
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{
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/* We may come here if the file quota is exeeded */
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continue;
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}
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break;
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}
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if (MyFlags & (MY_NABP | MY_FNABP))
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{
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if (sum_written == initial_count)
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DBUG_RETURN(0); /* Want only errors, not bytes written */
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if (MyFlags & (MY_WME | MY_FAE | MY_FNABP))
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{
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char errbuf[MYSYS_STRERROR_SIZE];
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my_error(EE_WRITE, MYF(0), my_filename(Filedes),
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my_errno(), my_strerror(errbuf, sizeof(errbuf), my_errno()));
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}
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DBUG_RETURN(MY_FILE_ERROR);
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}
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if (sum_written == 0)
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DBUG_RETURN(MY_FILE_ERROR);
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DBUG_RETURN(sum_written);
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} /* my_write */
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