mirror of
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120 lines
3.6 KiB
C
120 lines
3.6 KiB
C
/* Copyright (c) 2000, 2016, Oracle and/or its affiliates.
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Copyright (c) 2011, 2016, MariaDB
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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 02110-1335 USA */
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#include "mysys_priv.h"
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#include "mysys_err.h"
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#include <errno.h>
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/* Write a chunk of bytes to a file */
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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, written;
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uint errors;
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DBUG_ENTER("my_write");
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DBUG_PRINT("my",("fd: %d Buffer: %p Count: %lu MyFlags: %lu",
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Filedes, Buffer, (ulong) Count, MyFlags));
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errors= 0; written= 0;
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if (!(MyFlags & (MY_WME | MY_FAE | MY_FNABP)))
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MyFlags|= my_global_flags;
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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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for (;;)
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{
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#ifdef _WIN32
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if(Filedes < 0)
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{
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my_errno= errno= EBADF;
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DBUG_RETURN((size_t)-1);
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}
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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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/**
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To simulate the write error set the errno = error code
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and the number pf written bytes to -1.
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*/
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DBUG_EXECUTE_IF ("simulate_file_write_error",
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if (!errors) {
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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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break;
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if (writtenbytes != (size_t) -1)
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{ /* Safeguard */
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written+= writtenbytes;
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Buffer+= writtenbytes;
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Count-= writtenbytes;
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}
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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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#ifndef NO_BACKGROUND
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if (my_thread_var->abort)
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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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continue;
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}
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if ((writtenbytes == 0 || writtenbytes == (size_t) -1))
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{
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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 */
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}
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if (!writtenbytes && !errors++) /* Retry once */
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{
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/* We may come here if the file quota is exceeded */
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errno= EFBIG; /* Assume this is the error */
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continue;
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}
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}
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else
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continue; /* Retry */
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#endif
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/* Don't give a warning if it's ok that we only write part of the data */
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if (MyFlags & (MY_NABP | MY_FNABP))
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{
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if (MyFlags & (MY_WME | MY_FAE | MY_FNABP))
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{
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my_error(EE_WRITE, MYF(ME_BELL | (MyFlags & (ME_NOTE | ME_ERROR_LOG))),
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my_filename(Filedes),my_errno);
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}
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DBUG_RETURN(MY_FILE_ERROR); /* Error on read */
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}
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break; /* Return bytes written */
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}
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if (MyFlags & (MY_NABP | MY_FNABP))
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DBUG_RETURN(0); /* Want only errors */
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DBUG_RETURN(writtenbytes+written);
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} /* my_write */
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