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112 lines
3.7 KiB
C
112 lines
3.7 KiB
C
/* Copyright (c) 2000, 2013, 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 02110-1335 USA */
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#include "mysys_priv.h"
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#include "mysys_err.h"
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#include <my_base.h>
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#include <errno.h>
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/*
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Read a chunk of bytes from a file with retry's if needed
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The parameters are:
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File descriptor
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Buffer to hold at least Count bytes
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Bytes to read
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Flags on what to do on error
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Return:
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-1 on error
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0 if flag has bits MY_NABP or MY_FNABP set
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N number of bytes read.
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*/
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size_t my_read(File Filedes, uchar *Buffer, size_t Count, myf MyFlags)
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{
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size_t readbytes, save_count= 0;
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DBUG_ENTER("my_read");
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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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if (!(MyFlags & (MY_WME | MY_FAE | MY_FNABP)))
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MyFlags|= my_global_flags;
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for (;;)
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{
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errno= 0; /* Linux, Windows don't reset this on EOF/success */
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#ifdef _WIN32
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readbytes= my_win_read(Filedes, Buffer, Count);
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#else
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readbytes= read(Filedes, Buffer, Count);
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#endif
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DBUG_EXECUTE_IF ("simulate_file_read_error",
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{
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errno= ENOSPC;
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readbytes= (size_t) -1;
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DBUG_SET("-d,simulate_file_read_error");
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DBUG_SET("-d,simulate_my_b_fill_error");
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});
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if (readbytes != Count)
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{
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int got_errno= my_errno= errno;
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DBUG_PRINT("warning",("Read only %d bytes off %lu from %d, errno: %d",
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(int) readbytes, (ulong) Count, Filedes,
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got_errno));
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if (got_errno == 0 || (readbytes != (size_t) -1 &&
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(MyFlags & (MY_NABP | MY_FNABP))))
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my_errno= HA_ERR_FILE_TOO_SHORT;
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if ((readbytes == 0 || (int) readbytes == -1) && got_errno == EINTR)
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{
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DBUG_PRINT("debug", ("my_read() was interrupted and returned %ld",
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(long) readbytes));
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continue; /* Interrupted */
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}
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/* Do a read retry if we didn't get enough data on first read */
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if (readbytes != (size_t) -1 && readbytes != 0 &&
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(MyFlags & MY_FULL_IO))
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{
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Buffer+= readbytes;
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Count-= readbytes;
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save_count+= readbytes;
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continue;
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}
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if (MyFlags & (MY_WME | MY_FAE | MY_FNABP))
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{
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if (readbytes == (size_t) -1)
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my_error(EE_READ,
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MYF(ME_BELL | (MyFlags & (ME_NOTE | ME_ERROR_LOG))),
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my_filename(Filedes), got_errno);
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else if (MyFlags & (MY_NABP | MY_FNABP))
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my_error(EE_EOFERR,
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MYF(ME_BELL | (MyFlags & (ME_NOTE | ME_ERROR_LOG))),
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my_filename(Filedes), got_errno);
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}
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if (readbytes == (size_t) -1 ||
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((MyFlags & (MY_FNABP | MY_NABP)) && !(MyFlags & MY_FULL_IO)))
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DBUG_RETURN(MY_FILE_ERROR); /* Return with error */
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}
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if (MyFlags & (MY_NABP | MY_FNABP))
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readbytes= 0; /* Ok on read */
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else
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readbytes+= save_count;
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break;
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}
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DBUG_RETURN(readbytes);
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} /* my_read */
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