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mariadb/sql/log.cc
unknown a50761a565 Fix for BUG#2045 "Sending SIGHUP to mysqld crashes it if running with --log-bin". 
The constructor of Rotate_log_event used when we are rotating our binlog or
relay log, should not assume that there is a nonzero THD available.
For example, when we are reacting to SIGHUP, the THD is 0.
In fact we don't need to use the THD in this constructor;
we can do like for Stop_log_event, and use the minimal Log_event
constructor.
If we were allowed to put Unix-specific commands in the testsuite,
I'd add a test for this (<sigh>).


sql/log.cc:
  A comment to warn that thd can be 0.
  The part about LOG_EVENT_FORCED_ROTATE_F is just to avoid segfault;
  this flag is already removed in 4.1 anyway.
sql/log_event.cc:
  A comment.
sql/log_event.h:
  The constructor of Rotate_log_event used when we are rotating our binlog or
  relay log, should not assume that there is a nonzero THD available.
  For example, when we are reacting to SIGHUP, the THD is 0.
  In fact we don't need to use the THD in this constructor;
  we can do like for Stop_log_event, and use the minimal Log_event
  constructor.
  This fixes BUG#2045 
  "Sending SIGHUP to mysqld crashes it if running with --log-bin"
2003-12-08 16:18:25 +01:00

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/* Copyright (C) 2000-2003 MySQL AB
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; either version 2 of the License, or
(at your option) any later version.
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 */
/* logging of commands */
/* TODO: Abort logging when we get an error in reading or writing log files */
#ifdef __EMX__
#include <io.h>
#endif
#include "mysql_priv.h"
#include "sql_acl.h"
#include "sql_repl.h"
#include <my_dir.h>
#include <stdarg.h>
#include <m_ctype.h> // For test_if_number
#include <assert.h>
MYSQL_LOG mysql_log,mysql_update_log,mysql_slow_log,mysql_bin_log;
extern I_List<i_string> binlog_do_db, binlog_ignore_db;
static bool test_if_number(const char *str,
long *res, bool allow_wildcards);
/****************************************************************************
** Find a uniq filename for 'filename.#'.
** Set # to a number as low as possible
** returns != 0 if not possible to get uniq filename
****************************************************************************/
static int find_uniq_filename(char *name)
{
long number;
uint i,length;
char buff[FN_REFLEN];
struct st_my_dir *dir_info;
reg1 struct fileinfo *file_info;
ulong max_found=0;
DBUG_ENTER("find_uniq_filename");
length=dirname_part(buff,name);
char *start=name+length,*end=strend(start);
*end='.';
length= (uint) (end-start+1);
if (!(dir_info = my_dir(buff,MYF(MY_DONT_SORT))))
{ // This shouldn't happen
strmov(end,".1"); // use name+1
DBUG_RETURN(0);
}
file_info= dir_info->dir_entry;
for (i=dir_info->number_off_files ; i-- ; file_info++)
{
if (bcmp(file_info->name,start,length) == 0 &&
test_if_number(file_info->name+length, &number,0))
{
set_if_bigger(max_found,(ulong) number);
}
}
my_dirend(dir_info);
*end++='.';
sprintf(end,"%03ld",max_found+1);
DBUG_RETURN(0);
}
MYSQL_LOG::MYSQL_LOG()
:bytes_written(0), last_time(0), query_start(0), name(0),
file_id(1), open_count(1), log_type(LOG_CLOSED), write_error(0), inited(0),
need_start_event(1)
{
/*
We don't want to initialize LOCK_Log here as such initialization depends on
safe_mutex (when using safe_mutex) which depends on MY_INIT(), which is
called only in main(). Doing initialization here would make it happen
before main().
*/
index_file_name[0] = 0;
bzero((char*) &log_file,sizeof(log_file));
bzero((char*) &index_file, sizeof(index_file));
}
MYSQL_LOG::~MYSQL_LOG()
{
cleanup();
}
/* this is called only once */
void MYSQL_LOG::cleanup()
{
if (inited)
{
inited= 0;
close(LOG_CLOSE_INDEX);
(void) pthread_mutex_destroy(&LOCK_log);
(void) pthread_mutex_destroy(&LOCK_index);
(void) pthread_cond_destroy(&update_cond);
}
}
int MYSQL_LOG::generate_new_name(char *new_name, const char *log_name)
{
fn_format(new_name,log_name,mysql_data_home,"",4);
if (log_type != LOG_NORMAL)
{
if (!fn_ext(log_name)[0])
{
if (find_uniq_filename(new_name))
{
sql_print_error(ER(ER_NO_UNIQUE_LOGFILE), log_name);
return 1;
}
}
}
return 0;
}
void MYSQL_LOG::init(enum_log_type log_type_arg,
enum cache_type io_cache_type_arg,
bool no_auto_events_arg,
ulong max_size_arg)
{
DBUG_ENTER("MYSQL_LOG::init");
log_type = log_type_arg;
io_cache_type = io_cache_type_arg;
no_auto_events = no_auto_events_arg;
max_size=max_size_arg;
DBUG_PRINT("info",("log_type: %d max_size: %lu", log_type, max_size));
DBUG_VOID_RETURN;
}
void MYSQL_LOG::init_pthread_objects()
{
DBUG_ASSERT(inited == 0);
inited= 1;
(void) pthread_mutex_init(&LOCK_log,MY_MUTEX_INIT_SLOW);
(void) pthread_mutex_init(&LOCK_index, MY_MUTEX_INIT_SLOW);
(void) pthread_cond_init(&update_cond, 0);
}
/*
Open a (new) log file.
DESCRIPTION
- If binary logs, also open the index file and register the new
file name in it
- When calling this when the file is in use, you must have a locks
on LOCK_log and LOCK_index.
RETURN VALUES
0 ok
1 error
*/
bool MYSQL_LOG::open(const char *log_name, enum_log_type log_type_arg,
const char *new_name, const char *index_file_name_arg,
enum cache_type io_cache_type_arg,
bool no_auto_events_arg,
ulong max_size)
{
char buff[512];
File file= -1, index_file_nr= -1;
int open_flags = O_CREAT | O_APPEND | O_BINARY;
DBUG_ENTER("MYSQL_LOG::open");
DBUG_PRINT("enter",("log_type: %d",(int) log_type));
last_time=query_start=0;
write_error=0;
init(log_type_arg,io_cache_type_arg,no_auto_events_arg,max_size);
if (!(name=my_strdup(log_name,MYF(MY_WME))))
goto err;
if (new_name)
strmov(log_file_name,new_name);
else if (generate_new_name(log_file_name, name))
goto err;
if (io_cache_type == SEQ_READ_APPEND)
open_flags |= O_RDWR;
else
open_flags |= O_WRONLY;
db[0]=0;
open_count++;
if ((file=my_open(log_file_name,open_flags,
MYF(MY_WME | ME_WAITTANG))) < 0 ||
init_io_cache(&log_file, file, IO_SIZE, io_cache_type,
my_tell(file,MYF(MY_WME)), 0, MYF(MY_WME | MY_NABP)))
goto err;
switch (log_type) {
case LOG_NORMAL:
{
char *end;
#ifdef __NT__
sprintf(buff, "%s, Version: %s, started with:\nTCP Port: %d, Named Pipe: %s\n", my_progname, server_version, mysql_port, mysql_unix_port);
#else
sprintf(buff, "%s, Version: %s, started with:\nTcp port: %d Unix socket: %s\n", my_progname,server_version,mysql_port,mysql_unix_port);
#endif
end=strmov(strend(buff),"Time Id Command Argument\n");
if (my_b_write(&log_file, (byte*) buff,(uint) (end-buff)) ||
flush_io_cache(&log_file))
goto err;
break;
}
case LOG_NEW:
{
time_t skr=time(NULL);
struct tm tm_tmp;
localtime_r(&skr,&tm_tmp);
sprintf(buff,"# %s, Version: %s at %02d%02d%02d %2d:%02d:%02d\n",
my_progname,server_version,
tm_tmp.tm_year % 100,
tm_tmp.tm_mon+1,
tm_tmp.tm_mday,
tm_tmp.tm_hour,
tm_tmp.tm_min,
tm_tmp.tm_sec);
if (my_b_write(&log_file, (byte*) buff,(uint) strlen(buff)) ||
flush_io_cache(&log_file))
goto err;
break;
}
case LOG_BIN:
{
bool write_file_name_to_index_file=0;
myf opt= MY_UNPACK_FILENAME;
if (!index_file_name_arg)
{
index_file_name_arg= name; // Use same basename for index file
opt= MY_UNPACK_FILENAME | MY_REPLACE_EXT;
}
if (!my_b_filelength(&log_file))
{
/*
The binary log file was empty (probably newly created)
This is the normal case and happens when the user doesn't specify
an extension for the binary log files.
In this case we write a standard header to it.
*/
if (my_b_safe_write(&log_file, (byte*) BINLOG_MAGIC,
BIN_LOG_HEADER_SIZE))
goto err;
bytes_written += BIN_LOG_HEADER_SIZE;
write_file_name_to_index_file=1;
}
if (!my_b_inited(&index_file))
{
/*
First open of this class instance
Create an index file that will hold all file names uses for logging.
Add new entries to the end of it.
*/
fn_format(index_file_name, index_file_name_arg, mysql_data_home,
".index", opt);
if ((index_file_nr= my_open(index_file_name,
O_RDWR | O_CREAT | O_BINARY ,
MYF(MY_WME))) < 0 ||
init_io_cache(&index_file, index_file_nr,
IO_SIZE, WRITE_CACHE,
my_seek(index_file_nr,0L,MY_SEEK_END,MYF(0)),
0, MYF(MY_WME)))
goto err;
}
else
{
safe_mutex_assert_owner(&LOCK_index);
reinit_io_cache(&index_file, WRITE_CACHE, my_b_filelength(&index_file),
0, 0);
}
if (need_start_event && !no_auto_events)
{
need_start_event=0;
Start_log_event s;
s.set_log_pos(this);
s.write(&log_file);
}
if (flush_io_cache(&log_file))
goto err;
if (write_file_name_to_index_file)
{
/* As this is a new log file, we write the file name to the index file */
if (my_b_write(&index_file, (byte*) log_file_name,
strlen(log_file_name)) ||
my_b_write(&index_file, (byte*) "\n", 1) ||
flush_io_cache(&index_file))
goto err;
}
break;
}
case LOG_CLOSED: // Impossible
case LOG_TO_BE_OPENED:
DBUG_ASSERT(1);
break;
}
DBUG_RETURN(0);
err:
sql_print_error("Could not use %s for logging (error %d). \
Turning logging off for the whole duration of the MySQL server process. \
To turn it on again: fix the cause, \
shutdown the MySQL server and restart it.", log_name, errno);
if (file >= 0)
my_close(file,MYF(0));
if (index_file_nr >= 0)
my_close(index_file_nr,MYF(0));
end_io_cache(&log_file);
end_io_cache(&index_file);
safeFree(name);
log_type= LOG_CLOSED;
DBUG_RETURN(1);
}
int MYSQL_LOG::get_current_log(LOG_INFO* linfo)
{
pthread_mutex_lock(&LOCK_log);
strmake(linfo->log_file_name, log_file_name, sizeof(linfo->log_file_name)-1);
linfo->pos = my_b_tell(&log_file);
pthread_mutex_unlock(&LOCK_log);
return 0;
}
/*
Move all data up in a file in an filename index file
SYNOPSIS
copy_up_file_and_fill()
index_file File to move
offset Move everything from here to beginning
NOTE
File will be truncated to be 'offset' shorter or filled up with
newlines
IMPLEMENTATION
We do the copy outside of the IO_CACHE as the cache buffers would just
make things slower and more complicated.
In most cases the copy loop should only do one read.
RETURN VALUES
0 ok
*/
static bool copy_up_file_and_fill(IO_CACHE *index_file, my_off_t offset)
{
int bytes_read;
my_off_t init_offset= offset;
File file= index_file->file;
byte io_buf[IO_SIZE*2];
DBUG_ENTER("copy_up_file_and_fill");
for (;; offset+= bytes_read)
{
(void) my_seek(file, offset, MY_SEEK_SET, MYF(0));
if ((bytes_read= (int) my_read(file, io_buf, sizeof(io_buf), MYF(MY_WME)))
< 0)
goto err;
if (!bytes_read)
break; // end of file
(void) my_seek(file, offset-init_offset, MY_SEEK_SET, MYF(0));
if (my_write(file, (byte*) io_buf, bytes_read, MYF(MY_WME | MY_NABP)))
goto err;
}
/* The following will either truncate the file or fill the end with \n' */
if (my_chsize(file, offset - init_offset, '\n', MYF(MY_WME)))
goto err;
/* Reset data in old index cache */
reinit_io_cache(index_file, READ_CACHE, (my_off_t) 0, 0, 1);
DBUG_RETURN(0);
err:
DBUG_RETURN(1);
}
/*
Find the position in the log-index-file for the given log name
SYNOPSIS
find_log_pos()
linfo Store here the found log file name and position to
the NEXT log file name in the index file.
log_name Filename to find in the index file.
Is a null pointer if we want to read the first entry
need_lock Set this to 1 if the parent doesn't already have a
lock on LOCK_index
NOTE
On systems without the truncate function the file will end with one or
more empty lines. These will be ignored when reading the file.
RETURN VALUES
0 ok
LOG_INFO_EOF End of log-index-file found
LOG_INFO_IO Got IO error while reading file
*/
int MYSQL_LOG::find_log_pos(LOG_INFO *linfo, const char *log_name,
bool need_lock)
{
int error= 0;
char *fname= linfo->log_file_name;
uint log_name_len= log_name ? (uint) strlen(log_name) : 0;
DBUG_ENTER("find_log_pos");
DBUG_PRINT("enter",("log_name: %s", log_name ? log_name : "NULL"));
/*
Mutex needed because we need to make sure the file pointer does not move
from under our feet
*/
if (need_lock)
pthread_mutex_lock(&LOCK_index);
safe_mutex_assert_owner(&LOCK_index);
/* As the file is flushed, we can't get an error here */
(void) reinit_io_cache(&index_file, READ_CACHE, (my_off_t) 0, 0, 0);
for (;;)
{
uint length;
my_off_t offset= my_b_tell(&index_file);
/* If we get 0 or 1 characters, this is the end of the file */
if ((length= my_b_gets(&index_file, fname, FN_REFLEN)) <= 1)
{
/* Did not find the given entry; Return not found or error */
error= !index_file.error ? LOG_INFO_EOF : LOG_INFO_IO;
break;
}
// if the log entry matches, null string matching anything
if (!log_name ||
(log_name_len == length-1 && fname[log_name_len] == '\n' &&
!memcmp(fname, log_name, log_name_len)))
{
DBUG_PRINT("info",("Found log file entry"));
fname[length-1]=0; // remove last \n
linfo->index_file_start_offset= offset;
linfo->index_file_offset = my_b_tell(&index_file);
break;
}
}
if (need_lock)
pthread_mutex_unlock(&LOCK_index);
DBUG_RETURN(error);
}
/*
Find the position in the log-index-file for the given log name
SYNOPSIS
find_next_log()
linfo Store here the next log file name and position to
the file name after that.
need_lock Set this to 1 if the parent doesn't already have a
lock on LOCK_index
NOTE
- Before calling this function, one has to call find_log_pos()
to set up 'linfo'
- Mutex needed because we need to make sure the file pointer does not move
from under our feet
RETURN VALUES
0 ok
LOG_INFO_EOF End of log-index-file found
LOG_INFO_SEEK Could not allocate IO cache
LOG_INFO_IO Got IO error while reading file
*/
int MYSQL_LOG::find_next_log(LOG_INFO* linfo, bool need_lock)
{
int error= 0;
uint length;
char *fname= linfo->log_file_name;
if (need_lock)
pthread_mutex_lock(&LOCK_index);
safe_mutex_assert_owner(&LOCK_index);
/* As the file is flushed, we can't get an error here */
(void) reinit_io_cache(&index_file, READ_CACHE, linfo->index_file_offset, 0,
0);
linfo->index_file_start_offset= linfo->index_file_offset;
if ((length=my_b_gets(&index_file, fname, FN_REFLEN)) <= 1)
{
error = !index_file.error ? LOG_INFO_EOF : LOG_INFO_IO;
goto err;
}
fname[length-1]=0; // kill /n
linfo->index_file_offset = my_b_tell(&index_file);
err:
if (need_lock)
pthread_mutex_unlock(&LOCK_index);
return error;
}
/*
Delete all logs refered to in the index file
Start writing to a new log file. The new index file will only contain
this file.
SYNOPSIS
reset_logs()
thd Thread
NOTE
If not called from slave thread, write start event to new log
RETURN VALUES
0 ok
1 error
*/
bool MYSQL_LOG::reset_logs(THD* thd)
{
LOG_INFO linfo;
bool error=0;
const char* save_name;
enum_log_type save_log_type;
DBUG_ENTER("reset_logs");
/*
We need to get both locks to be sure that no one is trying to
write to the index log file.
*/
pthread_mutex_lock(&LOCK_log);
pthread_mutex_lock(&LOCK_index);
/* Save variables so that we can reopen the log */
save_name=name;
name=0; // Protect against free
save_log_type=log_type;
close(LOG_CLOSE_TO_BE_OPENED);
/* First delete all old log files */
if (find_log_pos(&linfo, NullS, 0))
{
error=1;
goto err;
}
for (;;)
{
my_delete(linfo.log_file_name, MYF(MY_WME));
if (find_next_log(&linfo, 0))
break;
}
/* Start logging with a new file */
close(LOG_CLOSE_INDEX);
my_delete(index_file_name, MYF(MY_WME)); // Reset (open will update)
if (!thd->slave_thread)
need_start_event=1;
open(save_name, save_log_type, 0, index_file_name,
io_cache_type, no_auto_events, max_size);
my_free((gptr) save_name, MYF(0));
err:
pthread_mutex_unlock(&LOCK_index);
pthread_mutex_unlock(&LOCK_log);
DBUG_RETURN(error);
}
/*
Delete the current log file, remove it from index file and start on next
SYNOPSIS
purge_first_log()
rli Relay log information
NOTE
- This is only called from the slave-execute thread when it has read
all commands from a log and want to switch to a new log.
- When this happens, we should never be in an active transaction as
a transaction is always written as a single block to the binary log.
IMPLEMENTATION
- Protects index file with LOCK_index
- Delete first log file,
- Copy all file names after this one to the front of the index file
- If the OS has truncate, truncate the file, else fill it with \n'
- Read the first file name from the index file and store in rli->linfo
RETURN VALUES
0 ok
LOG_INFO_EOF End of log-index-file found
LOG_INFO_SEEK Could not allocate IO cache
LOG_INFO_IO Got IO error while reading file
*/
int MYSQL_LOG::purge_first_log(struct st_relay_log_info* rli)
{
int error;
DBUG_ENTER("purge_first_log");
/*
Test pre-conditions.
Assume that we have previously read the first log and
stored it in rli->relay_log_name
*/
DBUG_ASSERT(is_open());
DBUG_ASSERT(rli->slave_running == 1);
DBUG_ASSERT(!strcmp(rli->linfo.log_file_name,rli->relay_log_name));
DBUG_ASSERT(rli->linfo.index_file_offset ==
strlen(rli->relay_log_name) + 1);
/* We have already processed the relay log, so it's safe to delete it */
my_delete(rli->relay_log_name, MYF(0));
pthread_mutex_lock(&LOCK_index);
if (copy_up_file_and_fill(&index_file, rli->linfo.index_file_offset))
{
error= LOG_INFO_IO;
goto err;
}
/*
Update the space counter used by all relay logs
Ok to broadcast after the critical region as there is no risk of
the mutex being destroyed by this thread later - this helps save
context switches
*/
pthread_mutex_lock(&rli->log_space_lock);
rli->log_space_total -= rli->relay_log_pos;
//tell the I/O thread to take the relay_log_space_limit into account
rli->ignore_log_space_limit= 0;
pthread_mutex_unlock(&rli->log_space_lock);
pthread_cond_broadcast(&rli->log_space_cond);
/*
Read the next log file name from the index file and pass it back to
the caller
*/
if ((error=find_log_pos(&rli->linfo, NullS, 0 /*no mutex*/)))
{
char buff[22];
sql_print_error("next log error: %d offset: %s log: %s",
error,
llstr(rli->linfo.index_file_offset,buff),
rli->linfo.log_file_name);
goto err;
}
/*
Reset position to current log. This involves setting both of the
position variables:
*/
rli->relay_log_pos = BIN_LOG_HEADER_SIZE;
rli->pending = 0;
strmake(rli->relay_log_name,rli->linfo.log_file_name,
sizeof(rli->relay_log_name)-1);
/* Store where we are in the new file for the execution thread */
flush_relay_log_info(rli);
err:
pthread_mutex_unlock(&LOCK_index);
DBUG_RETURN(error);
}
/*
Remove all logs before the given log from disk and from the index file.
SYNOPSIS
purge_logs()
thd Thread pointer
to_log Delete all log file name before this file. This file is not
deleted
NOTES
If any of the logs before the deleted one is in use,
only purge logs up to this one.
RETURN VALUES
0 ok
LOG_INFO_EOF to_log not found
*/
int MYSQL_LOG::purge_logs(THD* thd, const char* to_log)
{
int error;
LOG_INFO log_info;
DBUG_ENTER("purge_logs");
pthread_mutex_lock(&LOCK_index);
if ((error=find_log_pos(&log_info, to_log, 0 /*no mutex*/)))
goto err;
/*
File name exists in index file; Delete until we find this file
or a file that is used.
*/
if ((error=find_log_pos(&log_info, NullS, 0 /*no mutex*/)))
goto err;
while (strcmp(to_log,log_info.log_file_name) &&
!log_in_use(log_info.log_file_name))
{
/* It's not fatal even if we can't delete a log file */
my_delete(log_info.log_file_name, MYF(0));
if (find_next_log(&log_info, 0))
break;
}
/*
If we get killed -9 here, the sysadmin would have to edit
the log index file after restart - otherwise, this should be safe
*/
if (copy_up_file_and_fill(&index_file, log_info.index_file_start_offset))
{
error= LOG_INFO_IO;
goto err;
}
// now update offsets in index file for running threads
adjust_linfo_offsets(log_info.index_file_start_offset);
err:
pthread_mutex_unlock(&LOCK_index);
DBUG_RETURN(error);
}
/*
Create a new log file name
SYNOPSIS
make_log_name()
buf buf of at least FN_REFLEN where new name is stored
NOTE
If file name will be longer then FN_REFLEN it will be truncated
*/
void MYSQL_LOG::make_log_name(char* buf, const char* log_ident)
{
uint dir_len = dirname_length(log_file_name);
if (dir_len > FN_REFLEN)
dir_len=FN_REFLEN-1;
strnmov(buf, log_file_name, dir_len);
strmake(buf+dir_len, log_ident, FN_REFLEN - dir_len);
}
/*
Check if we are writing/reading to the given log file
*/
bool MYSQL_LOG::is_active(const char *log_file_name_arg)
{
return !strcmp(log_file_name, log_file_name_arg);
}
/*
Start writing to a new log file or reopen the old file
SYNOPSIS
new_file()
need_lock Set to 1 (default) if caller has not locked
LOCK_log and LOCK_index
NOTE
The new file name is stored last in the index file
*/
void MYSQL_LOG::new_file(bool need_lock)
{
char new_name[FN_REFLEN], *new_name_ptr, *old_name;
enum_log_type save_log_type;
DBUG_ENTER("MYSQL_LOG::new_file");
if (!is_open())
{
DBUG_PRINT("info",("log is closed"));
DBUG_VOID_RETURN;
}
if (need_lock)
{
pthread_mutex_lock(&LOCK_log);
pthread_mutex_lock(&LOCK_index);
}
safe_mutex_assert_owner(&LOCK_log);
safe_mutex_assert_owner(&LOCK_index);
/* Reuse old name if not binlog and not update log */
new_name_ptr= name;
/*
If user hasn't specified an extension, generate a new log name
We have to do this here and not in open as we want to store the
new file name in the current binary log file.
*/
if (generate_new_name(new_name, name))
goto end;
new_name_ptr=new_name;
if (log_type == LOG_BIN)
{
if (!no_auto_events)
{
/*
We log the whole file name for log file as the user may decide
to change base names at some point.
*/
THD* thd = current_thd; /* may be 0 if we are reacting to SIGHUP */
Rotate_log_event r(thd,new_name+dirname_length(new_name));
r.set_log_pos(this);
/*
Because this log rotation could have been initiated by a master of
the slave running with log-bin, we set the flag on rotate
event to prevent infinite log rotation loop
*/
if (thd && thd->slave_thread)
r.flags|= LOG_EVENT_FORCED_ROTATE_F;
r.write(&log_file);
bytes_written += r.get_event_len();
}
/*
Update needs to be signalled even if there is no rotate event
log rotation should give the waiting thread a signal to
discover EOF and move on to the next log.
*/
signal_update();
}
old_name=name;
save_log_type=log_type;
name=0; // Don't free name
close(LOG_CLOSE_TO_BE_OPENED);
/*
Note that at this point, log_type != LOG_CLOSED (important for is_open()).
*/
open(old_name, save_log_type, new_name_ptr, index_file_name, io_cache_type,
no_auto_events, max_size);
my_free(old_name,MYF(0));
end:
if (need_lock)
{
pthread_mutex_unlock(&LOCK_index);
pthread_mutex_unlock(&LOCK_log);
}
DBUG_VOID_RETURN;
}
bool MYSQL_LOG::append(Log_event* ev)
{
bool error = 0;
pthread_mutex_lock(&LOCK_log);
DBUG_ENTER("MYSQL_LOG::append");
DBUG_ASSERT(log_file.type == SEQ_READ_APPEND);
/*
Log_event::write() is smart enough to use my_b_write() or
my_b_append() depending on the kind of cache we have.
*/
if (ev->write(&log_file))
{
error=1;
goto err;
}
bytes_written += ev->get_event_len();
DBUG_PRINT("info",("max_size: %lu",max_size));
if ((uint) my_b_append_tell(&log_file) > max_size)
{
pthread_mutex_lock(&LOCK_index);
new_file(0);
pthread_mutex_unlock(&LOCK_index);
}
err:
pthread_mutex_unlock(&LOCK_log);
signal_update(); // Safe as we don't call close
DBUG_RETURN(error);
}
bool MYSQL_LOG::appendv(const char* buf, uint len,...)
{
bool error= 0;
DBUG_ENTER("MYSQL_LOG::appendv");
va_list(args);
va_start(args,len);
DBUG_ASSERT(log_file.type == SEQ_READ_APPEND);
pthread_mutex_lock(&LOCK_log);
do
{
if (my_b_append(&log_file,(byte*) buf,len))
{
error= 1;
goto err;
}
bytes_written += len;
} while ((buf=va_arg(args,const char*)) && (len=va_arg(args,uint)));
DBUG_PRINT("info",("max_size: %lu",max_size));
if ((uint) my_b_append_tell(&log_file) > max_size)
{
pthread_mutex_lock(&LOCK_index);
new_file(0);
pthread_mutex_unlock(&LOCK_index);
}
err:
pthread_mutex_unlock(&LOCK_log);
if (!error)
signal_update();
DBUG_RETURN(error);
}
/*
Write to normal (not rotable) log
This is the format for the 'normal', 'slow' and 'update' logs.
*/
bool MYSQL_LOG::write(THD *thd,enum enum_server_command command,
const char *format,...)
{
if (is_open() && (what_to_log & (1L << (uint) command)))
{
int error=0;
VOID(pthread_mutex_lock(&LOCK_log));
/* Test if someone closed between the is_open test and lock */
if (is_open())
{
time_t skr;
ulong id;
va_list args;
va_start(args,format);
char buff[32];
if (thd)
{ // Normal thread
if ((thd->options & OPTION_LOG_OFF) &&
(thd->master_access & SUPER_ACL))
{
VOID(pthread_mutex_unlock(&LOCK_log));
return 0; // No logging
}
id=thd->thread_id;
if (thd->user_time || !(skr=thd->query_start()))
skr=time(NULL); // Connected
}
else
{ // Log from connect handler
skr=time(NULL);
id=0;
}
if (skr != last_time)
{
last_time=skr;
struct tm tm_tmp;
struct tm *start;
localtime_r(&skr,&tm_tmp);
start=&tm_tmp;
/* Note that my_b_write() assumes it knows the length for this */
sprintf(buff,"%02d%02d%02d %2d:%02d:%02d\t",
start->tm_year % 100,
start->tm_mon+1,
start->tm_mday,
start->tm_hour,
start->tm_min,
start->tm_sec);
if (my_b_write(&log_file, (byte*) buff,16))
error=errno;
}
else if (my_b_write(&log_file, (byte*) "\t\t",2) < 0)
error=errno;
sprintf(buff,"%7ld %-11.11s", id,command_name[(uint) command]);
if (my_b_write(&log_file, (byte*) buff,strlen(buff)))
error=errno;
if (format)
{
if (my_b_write(&log_file, (byte*) " ",1) ||
my_b_vprintf(&log_file,format,args) == (uint) -1)
error=errno;
}
if (my_b_write(&log_file, (byte*) "\n",1) ||
flush_io_cache(&log_file))
error=errno;
if (error && ! write_error)
{
write_error=1;
sql_print_error(ER(ER_ERROR_ON_WRITE),name,error);
}
va_end(args);
}
VOID(pthread_mutex_unlock(&LOCK_log));
return error != 0;
}
return 0;
}
/*
Write an event to the binary log
*/
bool MYSQL_LOG::write(Log_event* event_info)
{
THD *thd=event_info->thd;
bool called_handler_commit=0;
bool error=0;
DBUG_ENTER("MYSQL_LOG::write(event)");
pthread_mutex_lock(&LOCK_log);
/*
In most cases this is only called if 'is_open()' is true; in fact this is
mostly called if is_open() *was* true a few instructions before, but it
could have changed since.
*/
if (is_open())
{
bool should_rotate= 0;
const char *local_db= event_info->get_db();
IO_CACHE *file= &log_file;
#ifdef USING_TRANSACTIONS
/*
Should we write to the binlog cache or to the binlog on disk?
Write to the binlog cache if:
- it is already not empty (meaning we're in a transaction; note that the
present event could be about a non-transactional table, but still we need
to write to the binlog cache in that case to handle updates to mixed
trans/non-trans table types the best possible in binlogging)
- or if the event asks for it (cache_stmt == true).
*/
if (opt_using_transactions &&
(event_info->get_cache_stmt() ||
(thd && my_b_tell(&thd->transaction.trans_log))))
file= &thd->transaction.trans_log;
#endif
DBUG_PRINT("info",("event type=%d",event_info->get_type_code()));
/*
In the future we need to add to the following if tests like
"do the involved tables match (to be implemented)
binlog_[wild_]{do|ignore}_table?" (WL#1049)"
*/
if ((thd && !(thd->options & OPTION_BIN_LOG) &&
(thd->master_access & SUPER_ACL)) ||
(local_db && !db_ok(local_db, binlog_do_db, binlog_ignore_db)))
{
VOID(pthread_mutex_unlock(&LOCK_log));
DBUG_PRINT("error",("!db_ok"));
DBUG_RETURN(0);
}
error=1;
/*
No check for auto events flag here - this write method should
never be called if auto-events are enabled
*/
/*
1. Write first log events which describe the 'run environment'
of the SQL command
*/
if (thd)
{
if (thd->last_insert_id_used)
{
Intvar_log_event e(thd,(uchar) LAST_INSERT_ID_EVENT,
thd->current_insert_id);
e.set_log_pos(this);
if (e.write(file))
goto err;
}
if (thd->insert_id_used)
{
Intvar_log_event e(thd,(uchar) INSERT_ID_EVENT,thd->last_insert_id);
e.set_log_pos(this);
if (e.write(file))
goto err;
}
if (thd->rand_used)
{
Rand_log_event e(thd,thd->rand_saved_seed1,thd->rand_saved_seed2);
e.set_log_pos(this);
if (e.write(file))
goto err;
}
if (thd->variables.convert_set)
{
char buf[256], *p;
p= strmov(strmov(buf, "SET CHARACTER SET "),
thd->variables.convert_set->name);
Query_log_event e(thd, buf, (ulong) (p - buf), 0);
e.set_log_pos(this);
if (e.write(file))
goto err;
}
/*
If the user has set FOREIGN_KEY_CHECKS=0 we wrap every SQL
command in the binlog inside:
SET FOREIGN_KEY_CHECKS=0;
<command>;
SET FOREIGN_KEY_CHECKS=1;
*/
if (thd->options & OPTION_NO_FOREIGN_KEY_CHECKS)
{
Query_log_event e(thd, "SET FOREIGN_KEY_CHECKS=0", 24, 0);
e.set_log_pos(this);
if (e.write(file))
goto err;
}
}
/* Write the SQL command */
event_info->set_log_pos(this);
if (event_info->write(file))
goto err;
/* Write log events to reset the 'run environment' of the SQL command */
if (thd && thd->options & OPTION_NO_FOREIGN_KEY_CHECKS)
{
Query_log_event e(thd, "SET FOREIGN_KEY_CHECKS=1", 24, 0);
e.set_log_pos(this);
if (e.write(file))
goto err;
}
/*
Tell for transactional table handlers up to which position in the
binlog file we wrote. The table handler can store this info, and
after crash recovery print for the user the offset of the last
transactions which were recovered. Actually, we must also call
the table handler commit here, protected by the LOCK_log mutex,
because otherwise the transactions may end up in a different order
in the table handler log!
Note that we will NOT call ha_report_binlog_offset_and_commit() if
there are binlog events cached in the transaction cache. That is
because then the log event which we write to the binlog here is
not a transactional event. In versions < 4.0.13 before this fix this
caused an InnoDB transaction to be committed if in the middle there
was a MyISAM event!
*/
if (file == &log_file) // we are writing to the real log (disk)
{
if (flush_io_cache(file))
goto err;
if (opt_using_transactions && !my_b_tell(&thd->transaction.trans_log))
{
/*
LOAD DATA INFILE in AUTOCOMMIT=1 mode writes to the binlog
chunks also before it is successfully completed. We only report
the binlog write and do the commit inside the transactional table
handler if the log event type is appropriate.
*/
if (event_info->get_type_code() == QUERY_EVENT ||
event_info->get_type_code() == EXEC_LOAD_EVENT)
{
error = ha_report_binlog_offset_and_commit(thd, log_file_name,
file->pos_in_file);
called_handler_commit=1;
}
}
/* We wrote to the real log, check automatic rotation; */
DBUG_PRINT("info",("max_size: %lu",max_size));
should_rotate= (my_b_tell(file) >= (my_off_t) max_size);
}
error=0;
err:
if (error)
{
if (my_errno == EFBIG)
my_error(ER_TRANS_CACHE_FULL, MYF(0));
else
my_error(ER_ERROR_ON_WRITE, MYF(0), name, errno);
write_error=1;
}
if (file == &log_file)
signal_update();
if (should_rotate)
{
pthread_mutex_lock(&LOCK_index);
new_file(0); // inside mutex
pthread_mutex_unlock(&LOCK_index);
}
}
pthread_mutex_unlock(&LOCK_log);
/*
Flush the transactional handler log file now that we have released
LOCK_log; the flush is placed here to eliminate the bottleneck on the
group commit
*/
if (called_handler_commit)
ha_commit_complete(thd);
DBUG_RETURN(error);
}
uint MYSQL_LOG::next_file_id()
{
uint res;
pthread_mutex_lock(&LOCK_log);
res = file_id++;
pthread_mutex_unlock(&LOCK_log);
return res;
}
/*
Write a cached log entry to the binary log
SYNOPSIS
write()
thd
cache The cache to copy to the binlog
commit_or_rollback If true, will write "COMMIT" in the end, if false will
write "ROLLBACK".
NOTE
- We only come here if there is something in the cache.
- The thing in the cache is always a complete transaction
- 'cache' needs to be reinitialized after this functions returns.
IMPLEMENTATION
- To support transaction over replication, we wrap the transaction
with BEGIN/COMMIT or BEGIN/ROLLBACK in the binary log.
We want to write a BEGIN/ROLLBACK block when a non-transactional table was
updated in a transaction which was rolled back. This is to ensure that the
same updates are run on the slave.
*/
bool MYSQL_LOG::write(THD *thd, IO_CACHE *cache, bool commit_or_rollback)
{
VOID(pthread_mutex_lock(&LOCK_log));
DBUG_ENTER("MYSQL_LOG::write(cache");
if (is_open()) // Should always be true
{
uint length;
/*
Add the "BEGIN" and "COMMIT" in the binlog around transactions
which may contain more than 1 SQL statement. If we run with
AUTOCOMMIT=1, then MySQL immediately writes each SQL statement to
the binlog when the statement has been completed. No need to add
"BEGIN" ... "COMMIT" around such statements. Otherwise, MySQL uses
thd->transaction.trans_log to cache the SQL statements until the
explicit commit, and at the commit writes the contents in .trans_log
to the binlog.
We write the "BEGIN" mark first in the buffer (.trans_log) where we
store the SQL statements for a transaction. At the transaction commit
we will add the "COMMIT mark and write the buffer to the binlog.
*/
{
Query_log_event qinfo(thd, "BEGIN", 5, TRUE);
/*
Now this Query_log_event has artificial log_pos 0. It must be adjusted
to reflect the real position in the log. Not doing it would confuse the
slave: it would prevent this one from knowing where he is in the
master's binlog, which would result in wrong positions being shown to
the user, MASTER_POS_WAIT undue waiting etc.
*/
qinfo.set_log_pos(this);
if (qinfo.write(&log_file))
goto err;
}
/* Read from the file used to cache the queries .*/
if (reinit_io_cache(cache, READ_CACHE, 0, 0, 0))
goto err;
length=my_b_bytes_in_cache(cache);
do
{
/* Write data to the binary log file */
if (my_b_write(&log_file, cache->read_pos, length))
goto err;
cache->read_pos=cache->read_end; // Mark buffer used up
} while ((length=my_b_fill(cache)));
/*
We write the command "COMMIT" as the last SQL command in the
binlog segment cached for this transaction
*/
{
Query_log_event qinfo(thd,
commit_or_rollback ? "COMMIT" : "ROLLBACK",
commit_or_rollback ? 6 : 8,
TRUE);
qinfo.set_log_pos(this);
if (qinfo.write(&log_file) || flush_io_cache(&log_file))
goto err;
}
if (cache->error) // Error on read
{
sql_print_error(ER(ER_ERROR_ON_READ), cache->file_name, errno);
write_error=1; // Don't give more errors
goto err;
}
if ((ha_report_binlog_offset_and_commit(thd, log_file_name,
log_file.pos_in_file)))
goto err;
signal_update();
DBUG_PRINT("info",("max_size: %lu",max_size));
if (my_b_tell(&log_file) >= (my_off_t) max_size)
{
pthread_mutex_lock(&LOCK_index);
new_file(0); // inside mutex
pthread_mutex_unlock(&LOCK_index);
}
}
VOID(pthread_mutex_unlock(&LOCK_log));
/* Flush the transactional handler log file now that we have released
LOCK_log; the flush is placed here to eliminate the bottleneck on the
group commit */
ha_commit_complete(thd);
DBUG_RETURN(0);
err:
if (!write_error)
{
write_error= 1;
sql_print_error(ER(ER_ERROR_ON_WRITE), name, errno);
}
VOID(pthread_mutex_unlock(&LOCK_log));
DBUG_RETURN(1);
}
/*
Write update log in a format suitable for incremental backup
NOTE
- This code should be deleted in MySQL 5,0 as the binary log
is a full replacement for the update log.
*/
bool MYSQL_LOG::write(THD *thd,const char *query, uint query_length,
time_t query_start_arg)
{
bool error=0;
time_t current_time;
if (!is_open())
return 0;
VOID(pthread_mutex_lock(&LOCK_log));
if (is_open())
{ // Safety agains reopen
int tmp_errno=0;
char buff[80],*end;
end=buff;
if (!(thd->options & OPTION_UPDATE_LOG) &&
(thd->master_access & SUPER_ACL))
{
VOID(pthread_mutex_unlock(&LOCK_log));
return 0;
}
if ((specialflag & SPECIAL_LONG_LOG_FORMAT) || query_start_arg)
{
current_time=time(NULL);
if (current_time != last_time)
{
last_time=current_time;
struct tm tm_tmp;
struct tm *start;
localtime_r(&current_time,&tm_tmp);
start=&tm_tmp;
/* Note that my_b_write() assumes it knows the length for this */
sprintf(buff,"# Time: %02d%02d%02d %2d:%02d:%02d\n",
start->tm_year % 100,
start->tm_mon+1,
start->tm_mday,
start->tm_hour,
start->tm_min,
start->tm_sec);
if (my_b_write(&log_file, (byte*) buff,24))
tmp_errno=errno;
}
if (my_b_printf(&log_file, "# User@Host: %s[%s] @ %s [%s]\n",
thd->priv_user,
thd->user,
thd->host ? thd->host : "",
thd->ip ? thd->ip : "") == (uint) -1)
tmp_errno=errno;
}
if (query_start_arg)
{
/* For slow query log */
if (my_b_printf(&log_file,
"# Query_time: %lu Lock_time: %lu Rows_sent: %lu Rows_examined: %lu\n",
(ulong) (current_time - query_start_arg),
(ulong) (thd->time_after_lock - query_start_arg),
(ulong) thd->sent_row_count,
(ulong) thd->examined_row_count) == (uint) -1)
tmp_errno=errno;
}
if (thd->db && strcmp(thd->db,db))
{ // Database changed
if (my_b_printf(&log_file,"use %s;\n",thd->db) == (uint) -1)
tmp_errno=errno;
strmov(db,thd->db);
}
if (thd->last_insert_id_used)
{
end=strmov(end,",last_insert_id=");
end=longlong10_to_str((longlong) thd->current_insert_id,end,-10);
}
// Save value if we do an insert.
if (thd->insert_id_used)
{
if (specialflag & SPECIAL_LONG_LOG_FORMAT)
{
end=strmov(end,",insert_id=");
end=longlong10_to_str((longlong) thd->last_insert_id,end,-10);
}
}
if (thd->query_start_used)
{
if (query_start_arg != thd->query_start())
{
query_start_arg=thd->query_start();
end=strmov(end,",timestamp=");
end=int10_to_str((long) query_start_arg,end,10);
}
}
if (end != buff)
{
*end++=';';
*end='\n';
if (my_b_write(&log_file, (byte*) "SET ",4) ||
my_b_write(&log_file, (byte*) buff+1,(uint) (end-buff)))
tmp_errno=errno;
}
if (!query)
{
end=strxmov(buff, "# administrator command: ",
command_name[thd->command], NullS);
query_length=(ulong) (end-buff);
query=buff;
}
if (my_b_write(&log_file, (byte*) query,query_length) ||
my_b_write(&log_file, (byte*) ";\n",2) ||
flush_io_cache(&log_file))
tmp_errno=errno;
if (tmp_errno)
{
error=1;
if (! write_error)
{
write_error=1;
sql_print_error(ER(ER_ERROR_ON_WRITE),name,error);
}
}
}
VOID(pthread_mutex_unlock(&LOCK_log));
return error;
}
/*
Wait until we get a signal that the binary log has been updated
SYNOPSIS
wait_for_update()
thd Thread variable
master_or_slave If 0, the caller is the Binlog_dump thread from master;
if 1, the caller is the SQL thread from the slave. This
influences only thd->proc_info.
NOTES
One must have a lock on LOCK_log before calling this function.
This lock will be freed before return!
The reason for the above is that for enter_cond() / exit_cond() to
work the mutex must be got before enter_cond() but releases before
exit_cond().
If you don't do it this way, you will get a deadlock in THD::awake()
*/
void MYSQL_LOG:: wait_for_update(THD* thd, bool master_or_slave)
{
safe_mutex_assert_owner(&LOCK_log);
const char* old_msg = thd->enter_cond(&update_cond, &LOCK_log,
master_or_slave ?
"Has read all relay log; waiting for \
the I/O slave thread to update it" :
"Has sent all binlog to slave; \
waiting for binlog to be updated");
pthread_cond_wait(&update_cond, &LOCK_log);
pthread_mutex_unlock(&LOCK_log); // See NOTES
thd->exit_cond(old_msg);
}
/*
Close the log file
SYNOPSIS
close()
exiting Bitmask for one or more of the following bits:
LOG_CLOSE_INDEX if we should close the index file
LOG_CLOSE_TO_BE_OPENED if we intend to call open
at once after close.
LOG_CLOSE_STOP_EVENT write a 'stop' event to the log
NOTES
One can do an open on the object at once after doing a close.
The internal structures are not freed until cleanup() is called
*/
void MYSQL_LOG::close(uint exiting)
{ // One can't set log_type here!
DBUG_ENTER("MYSQL_LOG::close");
DBUG_PRINT("enter",("exiting: %d", (int) exiting));
if (log_type != LOG_CLOSED && log_type != LOG_TO_BE_OPENED)
{
if (log_type == LOG_BIN && !no_auto_events &&
(exiting & LOG_CLOSE_STOP_EVENT))
{
Stop_log_event s;
s.set_log_pos(this);
s.write(&log_file);
signal_update();
}
end_io_cache(&log_file);
if (my_close(log_file.file,MYF(0)) < 0 && ! write_error)
{
write_error=1;
sql_print_error(ER(ER_ERROR_ON_WRITE), name, errno);
}
}
/*
The following test is needed even if is_open() is not set, as we may have
called a not complete close earlier and the index file is still open.
*/
if ((exiting & LOG_CLOSE_INDEX) && my_b_inited(&index_file))
{
end_io_cache(&index_file);
if (my_close(index_file.file, MYF(0)) < 0 && ! write_error)
{
write_error= 1;
sql_print_error(ER(ER_ERROR_ON_WRITE), index_file_name, errno);
}
}
log_type= (exiting & LOG_CLOSE_TO_BE_OPENED) ? LOG_TO_BE_OPENED : LOG_CLOSED;
safeFree(name);
DBUG_VOID_RETURN;
}
void MYSQL_LOG::set_max_size(ulong max_size_arg)
{
/*
We need to take locks, otherwise this may happen:
new_file() is called, calls open(old_max_size), then before open() starts,
set_max_size() sets max_size to max_size_arg, then open() starts and
uses the old_max_size argument, so max_size_arg has been overwritten and
it's like if the SET command was never run.
*/
DBUG_ENTER("MYSQL_LOG::set_max_size");
pthread_mutex_lock(&LOCK_log);
if (is_open())
max_size= max_size_arg;
pthread_mutex_unlock(&LOCK_log);
DBUG_VOID_RETURN;
}
/*
Check if a string is a valid number
SYNOPSIS
test_if_number()
str String to test
res Store value here
allow_wildcards Set to 1 if we should ignore '%' and '_'
NOTE
For the moment the allow_wildcards argument is not used
Should be move to some other file.
RETURN VALUES
1 String is a number
0 Error
*/
static bool test_if_number(register const char *str,
long *res, bool allow_wildcards)
{
reg2 int flag;
const char *start;
DBUG_ENTER("test_if_number");
flag=0; start=str;
while (*str++ == ' ') ;
if (*--str == '-' || *str == '+')
str++;
while (isdigit(*str) || (allow_wildcards &&
(*str == wild_many || *str == wild_one)))
{
flag=1;
str++;
}
if (*str == '.')
{
for (str++ ;
isdigit(*str) ||
(allow_wildcards && (*str == wild_many || *str == wild_one)) ;
str++, flag=1) ;
}
if (*str != 0 || flag == 0)
DBUG_RETURN(0);
if (res)
*res=atol(start);
DBUG_RETURN(1); /* Number ok */
} /* test_if_number */
void sql_print_error(const char *format,...)
{
va_list args;
time_t skr;
struct tm tm_tmp;
struct tm *start;
va_start(args,format);
DBUG_ENTER("sql_print_error");
VOID(pthread_mutex_lock(&LOCK_error_log));
#ifndef DBUG_OFF
{
char buff[1024];
my_vsnprintf(buff,sizeof(buff)-1,format,args);
DBUG_PRINT("error",("%s",buff));
va_end(args);
va_start(args,format);
}
#endif
skr=time(NULL);
localtime_r(&skr,&tm_tmp);
start=&tm_tmp;
fprintf(stderr,"%02d%02d%02d %2d:%02d:%02d ",
start->tm_year % 100,
start->tm_mon+1,
start->tm_mday,
start->tm_hour,
start->tm_min,
start->tm_sec);
(void) vfprintf(stderr,format,args);
(void) fputc('\n',stderr);
fflush(stderr);
va_end(args);
VOID(pthread_mutex_unlock(&LOCK_error_log));
DBUG_VOID_RETURN;
}
void sql_perror(const char *message)
{
#ifdef HAVE_STRERROR
sql_print_error("%s: %s",message, strerror(errno));
#else
perror(message);
#endif
}
bool flush_error_log()
{
bool result=0;
if (opt_error_log)
{
char err_renamed[FN_REFLEN], *end;
end= strmake(err_renamed,log_error_file,FN_REFLEN-4);
strmov(end, "-old");
#ifdef __WIN__
char err_temp[FN_REFLEN+4];
/*
On Windows is necessary a temporary file for to rename
the current error file.
*/
strmov(strmov(err_temp, err_renamed),"-tmp");
(void) my_delete(err_temp, MYF(0));
if (freopen(err_temp,"a+",stdout))
{
freopen(err_temp,"a+",stderr);
(void) my_delete(err_renamed, MYF(0));
my_rename(log_error_file,err_renamed,MYF(0));
if (freopen(log_error_file,"a+",stdout))
freopen(log_error_file,"a+",stderr);
int fd, bytes;
char buf[IO_SIZE];
if ((fd = my_open(err_temp, O_RDONLY, MYF(0))) >= 0)
{
while ((bytes = (int) my_read(fd, (byte*) buf, IO_SIZE, MYF(0))) > 0)
my_fwrite(stderr, (byte*) buf, (uint) strlen(buf),MYF(0));
my_close(fd, MYF(0));
}
(void) my_delete(err_temp, MYF(0));
}
else
result= 1;
#else
my_rename(log_error_file,err_renamed,MYF(0));
if (freopen(log_error_file,"a+",stdout))
freopen(log_error_file,"a+",stderr);
else
result= 1;
#endif
}
return result;
}
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