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2aecdd1a91
(All commit emails since 4.0.1 checked) This had to be done now, before the 4.1 tree changes to much, to make it easy to propagate bug fixes to the 4.1 tree.
84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/* Copyright (C) 2000 MySQL AB
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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; either version 2 of the License, or
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(at your option) any later version.
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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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/*
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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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uint my_read(File Filedes, byte *Buffer, uint Count, myf MyFlags)
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{
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uint readbytes,save_count;
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DBUG_ENTER("my_read");
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DBUG_PRINT("my",("Fd: %d Buffer: %lx Count: %u MyFlags: %d",
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Filedes, Buffer, Count, MyFlags));
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save_count=Count;
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for (;;)
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{
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errno=0; /* Linux doesn't reset this */
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if ((readbytes = (uint) read(Filedes, Buffer, Count)) != Count)
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{
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my_errno=errno ? errno : -1;
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DBUG_PRINT("warning",("Read only %ld bytes off %ld from %d, errno: %d",
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readbytes,Count,Filedes,my_errno));
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#ifdef THREAD
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if (readbytes == 0 && errno == EINTR)
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continue; /* Interrupted */
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#endif
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if (MyFlags & (MY_WME | MY_FAE | MY_FNABP))
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{
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if ((int) readbytes == -1)
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my_error(EE_READ, MYF(ME_BELL+ME_WAITTANG),
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my_filename(Filedes),my_errno);
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else if (MyFlags & (MY_NABP | MY_FNABP))
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my_error(EE_EOFERR, MYF(ME_BELL+ME_WAITTANG),
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my_filename(Filedes),my_errno);
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}
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if ((int) readbytes == -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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if (readbytes > 0 && (MyFlags & MY_FULL_IO))
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{
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Buffer+=readbytes;
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Count-=readbytes;
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continue;
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}
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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 if (MyFlags & MY_FULL_IO)
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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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