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https://github.com/VCMP-SqMod/SqMod.git
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67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02111-1301, 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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/* Read a chunk of bytes from a file */
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uint my_read(File Filedes, unsigned char *Buffer, uint Count, myf MyFlags)
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/* File descriptor */
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/* Buffer must be at least count bytes */
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/* Max number of bytes returnd */
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/* Flags on what to do on error */
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{
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uint readbytes;
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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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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 || (MyFlags & (MY_FNABP | MY_NABP)))
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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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break;
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}
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DBUG_RETURN(readbytes);
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} /* my_read */
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