diff options
Diffstat (limited to 'deps/mysqllite/mysys/my_pread.c')
| -rw-r--r-- | deps/mysqllite/mysys/my_pread.c | 206 |
1 files changed, 0 insertions, 206 deletions
diff --git a/deps/mysqllite/mysys/my_pread.c b/deps/mysqllite/mysys/my_pread.c deleted file mode 100644 index e006360c11..0000000000 --- a/deps/mysqllite/mysys/my_pread.c +++ /dev/null @@ -1,206 +0,0 @@ -/* Copyright (C) 2000 MySQL AB, 2008-2009 Sun Microsystems, Inc - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; version 2 of the License. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ - -#include "mysys_priv.h" -#include "mysys_err.h" -#include "my_base.h" -#include <m_string.h> -#include <errno.h> -#if defined (HAVE_PREAD) && !defined(_WIN32) -#include <unistd.h> -#endif - - - -/* - Read a chunk of bytes from a file from a given position - - SYNOPSIOS - my_pread() - Filedes File decsriptor - Buffer Buffer to read data into - Count Number of bytes to read - offset Position to read from - MyFlags Flags - - NOTES - This differs from the normal pread() call in that we don't care - to set the position in the file back to the original position - if the system doesn't support pread(). - - RETURN - (size_t) -1 Error - # Number of bytes read -*/ - -size_t my_pread(File Filedes, uchar *Buffer, size_t Count, my_off_t offset, - myf MyFlags) -{ - size_t readbytes; - int error= 0; -#if !defined (HAVE_PREAD) && !defined (_WIN32) - int save_errno; -#endif - DBUG_ENTER("my_pread"); - DBUG_PRINT("my",("fd: %d Seek: %llu Buffer: %p Count: %lu MyFlags: %d", - Filedes, (ulonglong)offset, Buffer, (ulong)Count, MyFlags)); - for (;;) - { - errno= 0; /* Linux, Windows don't reset this on EOF/success */ -#if !defined (HAVE_PREAD) && !defined (_WIN32) - mysql_mutex_lock(&my_file_info[Filedes].mutex); - readbytes= (uint) -1; - error= (lseek(Filedes, offset, MY_SEEK_SET) == (my_off_t) -1 || - (readbytes= read(Filedes, Buffer, Count)) != Count); - save_errno= errno; - mysql_mutex_unlock(&my_file_info[Filedes].mutex); - if (error) - errno= save_errno; -#else -#if defined(_WIN32) - readbytes= my_win_pread(Filedes, Buffer, Count, offset); -#else - readbytes= pread(Filedes, Buffer, Count, offset); -#endif - error= (readbytes != Count); -#endif - if(error) - { - my_errno= errno ? errno : -1; - if (errno == 0 || (readbytes != (size_t) -1 && - (MyFlags & (MY_NABP | MY_FNABP)))) - my_errno= HA_ERR_FILE_TOO_SHORT; - - DBUG_PRINT("warning",("Read only %d bytes off %u from %d, errno: %d", - (int) readbytes, (uint) Count,Filedes,my_errno)); - - if ((readbytes == 0 || readbytes == (size_t) -1) && errno == EINTR) - { - DBUG_PRINT("debug", ("my_pread() was interrupted and returned %d", - (int) readbytes)); - continue; /* Interrupted */ - } - - if (MyFlags & (MY_WME | MY_FAE | MY_FNABP)) - { - if (readbytes == (size_t) -1) - my_error(EE_READ, MYF(ME_BELL+ME_WAITTANG), - my_filename(Filedes),my_errno); - else if (MyFlags & (MY_NABP | MY_FNABP)) - my_error(EE_EOFERR, MYF(ME_BELL+ME_WAITTANG), - my_filename(Filedes),my_errno); - } - if (readbytes == (size_t) -1 || (MyFlags & (MY_FNABP | MY_NABP))) - DBUG_RETURN(MY_FILE_ERROR); /* Return with error */ - } - if (MyFlags & (MY_NABP | MY_FNABP)) - DBUG_RETURN(0); /* Read went ok; Return 0 */ - DBUG_RETURN(readbytes); /* purecov: inspected */ - } -} /* my_pread */ - - -/* - Write a chunk of bytes to a file at a given position - - SYNOPSIOS - my_pwrite() - Filedes File decsriptor - Buffer Buffer to write data from - Count Number of bytes to write - offset Position to write to - MyFlags Flags - - NOTES - This differs from the normal pwrite() call in that we don't care - to set the position in the file back to the original position - if the system doesn't support pwrite() - - RETURN - (size_t) -1 Error - # Number of bytes read -*/ - -size_t my_pwrite(File Filedes, const uchar *Buffer, size_t Count, - my_off_t offset, myf MyFlags) -{ - size_t writtenbytes, written; - uint errors; - - DBUG_ENTER("my_pwrite"); - DBUG_PRINT("my",("fd: %d Seek: %llu Buffer: %p Count: %lu MyFlags: %d", - Filedes, offset, Buffer, (ulong)Count, MyFlags)); - errors= 0; - written= 0; - - for (;;) - { -#if !defined (HAVE_PREAD) && !defined (_WIN32) - int error; - writtenbytes= (size_t) -1; - mysql_mutex_lock(&my_file_info[Filedes].mutex); - error= (lseek(Filedes, offset, MY_SEEK_SET) != (my_off_t) -1 && - (writtenbytes= write(Filedes, Buffer, Count)) == Count); - mysql_mutex_unlock(&my_file_info[Filedes].mutex); - if (error) - break; -#elif defined (_WIN32) - writtenbytes= my_win_pwrite(Filedes, Buffer, Count, offset); -#else - writtenbytes= pwrite(Filedes, Buffer, Count, offset); -#endif - if(writtenbytes == Count) - break; - my_errno= errno; - if (writtenbytes != (size_t) -1) - { - written+= writtenbytes; - Buffer+= writtenbytes; - Count-= writtenbytes; - offset+= writtenbytes; - } - DBUG_PRINT("error",("Write only %u bytes", (uint) writtenbytes)); -#ifndef NO_BACKGROUND - - if (my_thread_var->abort) - MyFlags&= ~ MY_WAIT_IF_FULL; /* End if aborted by user */ - - if ((my_errno == ENOSPC || my_errno == EDQUOT) && - (MyFlags & MY_WAIT_IF_FULL)) - { - wait_for_free_space(my_filename(Filedes), errors); - errors++; - continue; - } - if ((writtenbytes && writtenbytes != (size_t) -1) || my_errno == EINTR) - continue; /* Retry */ -#endif - if (MyFlags & (MY_NABP | MY_FNABP)) - { - if (MyFlags & (MY_WME | MY_FAE | MY_FNABP)) - { - my_error(EE_WRITE, MYF(ME_BELL | ME_WAITTANG), - my_filename(Filedes),my_errno); - } - DBUG_RETURN(MY_FILE_ERROR); /* Error on read */ - } - else - break; /* Return bytes written */ - } - DBUG_EXECUTE_IF("check", my_seek(Filedes, -1, SEEK_SET, MYF(0));); - if (MyFlags & (MY_NABP | MY_FNABP)) - DBUG_RETURN(0); /* Want only errors */ - DBUG_RETURN(writtenbytes+written); /* purecov: inspected */ -} /* my_pwrite */ |