mirror of
https://github.com/MariaDB/server.git
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3d6eb7afcf
This fixed the MySQL bug# 20338 about misuse of double underscore prefix __WIN__, which was old MySQL's idea of identifying Windows Replace it by _WIN32 standard symbol for targeting Windows OS (both 32 and 64 bit) Not that connect storage engine is not fixed in this patch (must be fixed in "upstream" branch)
97 lines
2.8 KiB
C++
97 lines
2.8 KiB
C++
/* Copyright (c) 2000, 2010, 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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/**
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@file
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@details
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Caching of files with only does (sequential) read or writes of fixed-
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length records. A read isn't allowed to go over file-length. A read is ok
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if it ends at file-length and next read can try to read after file-length
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(and get a EOF-error).
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Possibly use of asyncronic io.
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macros for read and writes for faster io.
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Used instead of FILE when reading or writing whole files.
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This will make mf_rec_cache obsolete.
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One can change info->pos_in_file to a higher value to skip bytes in file if
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also info->read_pos is set to info->read_end.
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If called through open_cached_file(), then the temporary file will
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only be created if a write exeeds the file buffer or if one calls
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flush_io_cache().
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*/
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#include "mariadb.h"
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#include "sql_priv.h"
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#include "sql_class.h" // THD
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#ifdef HAVE_REPLICATION
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extern "C" {
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/**
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Read buffered from the net.
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@retval
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1 if can't read requested characters
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@retval
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0 if record read
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*/
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int _my_b_net_read(IO_CACHE *info, uchar *Buffer, size_t)
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{
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ulong read_length;
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NET *net= &(current_thd)->net;
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DBUG_ENTER("_my_b_net_read");
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if (!info->end_of_file)
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DBUG_RETURN(1); /* because my_b_get (no _) takes 1 byte at a time */
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read_length= my_net_read_packet(net, 0);
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if (unlikely(read_length == packet_error))
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{
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info->error= -1;
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DBUG_RETURN(1);
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}
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if (unlikely(read_length == 0))
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{
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info->end_of_file= 0; /* End of file from client */
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DBUG_RETURN(1);
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}
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/* to set up stuff for my_b_get (no _) */
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info->read_end = (info->read_pos = (uchar*) net->read_pos) + read_length;
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Buffer[0] = info->read_pos[0]; /* length is always 1 */
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/*
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info->request_pos is used by log_loaded_block() to know the size
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of the current block.
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info->pos_in_file is used by log_loaded_block() too.
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*/
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info->pos_in_file+= read_length;
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info->request_pos=info->read_pos;
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info->read_pos++;
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DBUG_RETURN(0);
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}
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} /* extern "C" */
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#elif defined(_WIN32)
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// Remove linker warning 4221 about empty file
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namespace { char dummy; };
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#endif /* HAVE_REPLICATION */
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