BuildSystem/Windows: * Added 5.1.50 (GA) MySQL client sources for crosscompiling (or lazy) windows people.
* Added an option to autosearch for your own installed MySQL as before. Note that default setting is to use the internal MySQL. * You can now build 32-bit even if your MySQL is x64 and vice versa. * Recommended MySQL server version for use with provided MySQL client sources is 5.1.x. * If your server version is different, let CMake autofind and use it instead (check EXTERNAL_MYSQL option) --HG-- branch : trunk
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/* 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; 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., 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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#ifdef HAVE_PREAD
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#include <unistd.h>
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#endif
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/*
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Read a chunk of bytes from a file from a given position
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SYNOPSIOS
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my_pread()
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Filedes File decsriptor
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Buffer Buffer to read data into
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Count Number of bytes to read
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offset Position to read from
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MyFlags Flags
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NOTES
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This differs from the normal pread() call in that we don't care
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to set the position in the file back to the original position
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if the system doesn't support pread().
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RETURN
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(size_t) -1 Error
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# Number of bytes read
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*/
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size_t my_pread(File Filedes, uchar *Buffer, size_t Count, my_off_t offset,
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myf MyFlags)
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{
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size_t readbytes;
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int error= 0;
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DBUG_ENTER("my_pread");
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DBUG_PRINT("my",("Fd: %d Seek: %lu Buffer: 0x%lx Count: %u MyFlags: %d",
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Filedes, (ulong) offset, (long) Buffer, (uint) Count,
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MyFlags));
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for (;;)
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{
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#ifndef __WIN__
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errno=0; /* Linux doesn't reset this */
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#endif
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#ifndef HAVE_PREAD
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pthread_mutex_lock(&my_file_info[Filedes].mutex);
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readbytes= (uint) -1;
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error= (lseek(Filedes, offset, MY_SEEK_SET) == (my_off_t) -1 ||
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(readbytes= read(Filedes, Buffer, (uint) Count)) != Count);
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pthread_mutex_unlock(&my_file_info[Filedes].mutex);
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#else
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if ((error= ((readbytes= pread(Filedes, Buffer, Count, offset)) != Count)))
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my_errno= errno ? errno : -1;
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#endif
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if (error || readbytes != Count)
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{
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DBUG_PRINT("warning",("Read only %d bytes off %u from %d, errno: %d",
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(int) readbytes, (uint) Count,Filedes,my_errno));
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#ifdef THREAD
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if ((readbytes == 0 || readbytes == (size_t) -1) && errno == EINTR)
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{
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DBUG_PRINT("debug", ("my_pread() was interrupted and returned %d",
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(int) readbytes));
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continue; /* Interrupted */
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}
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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 (readbytes == (size_t) -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 (readbytes == (size_t) -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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DBUG_RETURN(0); /* Read went ok; Return 0 */
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DBUG_RETURN(readbytes); /* purecov: inspected */
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}
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} /* my_pread */
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/*
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Write a chunk of bytes to a file at a given position
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SYNOPSIOS
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my_pwrite()
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Filedes File decsriptor
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Buffer Buffer to write data from
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Count Number of bytes to write
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offset Position to write to
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MyFlags Flags
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NOTES
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This differs from the normal pwrite() call in that we don't care
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to set the position in the file back to the original position
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if the system doesn't support pwrite()
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RETURN
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(size_t) -1 Error
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# Number of bytes read
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*/
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size_t my_pwrite(int Filedes, const uchar *Buffer, size_t Count,
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my_off_t offset, myf MyFlags)
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{
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size_t writenbytes, written;
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uint errors;
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DBUG_ENTER("my_pwrite");
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DBUG_PRINT("my",("Fd: %d Seek: %lu Buffer: 0x%lx Count: %u MyFlags: %d",
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Filedes, (ulong) offset, (long) Buffer, (uint) Count,
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MyFlags));
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errors= 0;
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written= 0;
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for (;;)
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{
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#ifndef HAVE_PREAD
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int error;
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writenbytes= (size_t) -1;
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pthread_mutex_lock(&my_file_info[Filedes].mutex);
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error= (lseek(Filedes, offset, MY_SEEK_SET) != (my_off_t) -1 &&
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(writenbytes = write(Filedes, Buffer, (uint) Count)) == Count);
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pthread_mutex_unlock(&my_file_info[Filedes].mutex);
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if (error)
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break;
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#else
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if ((writenbytes= pwrite(Filedes, Buffer, Count,offset)) == Count)
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break;
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my_errno= errno;
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#endif
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if (writenbytes != (size_t) -1)
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{ /* Safegueard */
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written+=writenbytes;
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Buffer+=writenbytes;
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Count-=writenbytes;
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offset+=writenbytes;
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}
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DBUG_PRINT("error",("Write only %u bytes", (uint) writenbytes));
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#ifndef NO_BACKGROUND
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#ifdef THREAD
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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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#endif
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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 ((writenbytes && writenbytes != (size_t) -1) || my_errno == EINTR)
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continue; /* Retry */
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#endif
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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 | ME_WAITTANG),
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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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else
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break; /* Return bytes written */
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}
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DBUG_EXECUTE_IF("check", my_seek(Filedes, -1, SEEK_SET, MYF(0)););
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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(writenbytes+written); /* purecov: inspected */
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} /* my_pwrite */
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