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/* Copyright (C) 2003-2006 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; 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 "log.h"
#include <my_global.h>
#include <m_string.h>
#include <my_sys.h>
#include <stdarg.h>
#include "portability.h" /* for vsnprintf() on Windows. */
/*
TODO:
- add flexible header support
- rewrite all fprintf with fwrite
- think about using 'write' instead of fwrite/fprintf on POSIX systems
*/
/*
Format log entry and write it to the given stream.
SYNOPSIS
log()
*/
static void log(FILE *file,const char *level_tag, const char *format,
va_list args)
{
/*
log() should be thread-safe; it implies that we either call fprintf()
once per log(), or use flockfile()/funlockfile(). But flockfile() is
POSIX, not ANSI C, so we try to vsnprintf the whole message to the
stack, and if stack buffer is not enough, to malloced string. When
message is formatted, it is fprintf()'ed to the file.
*/
/* Format time like MYSQL_LOG does. */
time_t now= time(0);
struct tm bd_time; // broken-down time
localtime_r(&now, &bd_time);
char buff_date[128];
sprintf(buff_date, "[%d/%lu] [%02d/%02d/%02d %02d:%02d:%02d] [%s] ",
(int) getpid(),
(unsigned long) pthread_self(),
(int) bd_time.tm_year % 100,
(int) bd_time.tm_mon + 1,
(int) bd_time.tm_mday,
(int) bd_time.tm_hour,
(int) bd_time.tm_min,
(int) bd_time.tm_sec,
(const char *) level_tag);
/* Format the message */
char buff_stack[256];
int n= vsnprintf(buff_stack, sizeof(buff_stack), format, args);
/*
return value of vsnprintf can vary, according to various standards;
try to check all cases.
*/
char *buff_msg= buff_stack;
if (n < 0 || n == sizeof(buff_stack))
{
int size= sizeof(buff_stack) * 2;
buff_msg= (char*) my_malloc(size, MYF(0));
while (TRUE)
{
if (buff_msg == 0)
{
strmake(buff_stack, "log(): message is too big, my_malloc() failed",
sizeof(buff_stack) - 1);
buff_msg= buff_stack;
break;
}
n = vsnprintf(buff_msg, size, format, args);
if (n >= 0 && n < size)
break;
size*= 2;
/* realloc() does unnecessary memcpy */
my_free(buff_msg, 0);
buff_msg= (char*) my_malloc(size, MYF(0));
}
}
else if ((size_t) n > sizeof(buff_stack))
{
buff_msg= (char*) my_malloc(n + 1, MYF(0));
#ifdef DBUG
DBUG_ASSERT(n == vsnprintf(buff_msg, n + 1, format, args));
#else
vsnprintf(buff_msg, n + 1, format, args);
#endif
}
fprintf(file, "%s%s\n", buff_date, buff_msg);
if (buff_msg != buff_stack)
my_free(buff_msg, 0);
/* don't fflush() the file: buffering strategy is set in log_init() */
}
/**************************************************************************
Logging: implementation of public interface.
**************************************************************************/
/*
The function initializes logging sub-system.
SYNOPSIS
log_init()
*/
void log_init()
{
/*
stderr is unbuffered by default; there is no good of line buffering,
as all logging is performed linewise - so remove buffering from stdout
also
*/
setbuf(stdout, 0);
}
/*
The function is intended to log error messages. It precedes a message
with date, time and [ERROR] tag and print it to the stderr.
SYNOPSIS
log_error()
format [IN] format string
... [IN] arguments to format
*/
void log_error(const char *format, ...)
{
va_list args;
va_start(args, format);
log(stderr, "ERROR", format, args);
va_end(args);
}
/*
The function is intended to log information messages. It precedes
a message with date, time and [INFO] tag and print it to the stdout.
SYNOPSIS
log_error()
format [IN] format string
... [IN] arguments to format
*/
void log_info(const char *format, ...)
{
va_list args;
va_start(args, format);
log(stdout, "INFO", format, args);
va_end(args);
}
/*
The function prints information to the error log and eixt(1).
SYNOPSIS
die()
format [IN] format string
... [IN] arguments to format
*/
void die(const char *format, ...)
{
va_list args;
fprintf(stderr,"%s: ", my_progname);
va_start(args, format);
vfprintf(stderr, format, args);
va_end(args);
fprintf(stderr, "\n");
exit(1);
}
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