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Edit File : service_logger.h \| Size : 3.47 KB
/* Copyright (C) 2012 Monty Program 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA / #ifndef MYSQL_SERVICE_LOGGER_INCLUDED #define MYSQL_SERVICE_LOGGER_INCLUDED #ifndef MYSQL_ABI_CHECK #include <stdarg.h> #endif /* @file logger service Log file with rotation implementation. This service implements logging with possible rotation of the log files. Interface intentionally tries to be similar to FILE* related functions. So that one can open the log with logger_open(), specifying the limit on the logfile size and the rotations number. Then it's possible to write messages to the log with logger_printf or logger_vprintf functions. As the size of the logfile grows over the specified limit, it is renamed to 'logfile.1'. The former 'logfile.1' becomes 'logfile.2', etc. The file 'logfile.rotations' is removed. That's how the rotation works. The rotation can be forced with the logger_rotate() call. Finally the log should be closed with logger_close(). @notes: Implementation checks the size of the log file before it starts new printf into it. So the size of the file gets over the limit when it rotates. The access is secured with the mutex, so the log is threadsafe. / #ifdef __cplusplus extern "C" { #endif typedef struct logger_handle_st LOGGER_HANDLE; extern struct logger_service_st { void (logger_init_mutexes)(); LOGGER_HANDLE* (open)(const char path, unsigned long long size_limit, unsigned int rotations); int (close)(LOGGER_HANDLE log); int (vprintf)(LOGGER_HANDLE log, const char fmt, va_list argptr); int (printf)(LOGGER_HANDLE log, const char fmt, ...); int (write)(LOGGER_HANDLE log, const char buffer, size_t size); int (rotate)(LOGGER_HANDLE log); } logger_service; #ifdef MYSQL_DYNAMIC_PLUGIN #define logger_init_mutexes logger_service->logger_init_mutexes #define logger_open(path, size_limit, rotations) \ (logger_service->open(path, size_limit, rotations)) #define logger_close(log) (logger_service->close(log)) #define logger_rotate(log) (logger_service->rotate(log)) #define logger_vprintf(log, fmt, argptr) (logger_service->\ vprintf(log, fmt, argptr)) #define logger_printf (logger_service->printf) #define logger_write(log, buffer, size) \ (logger_service->write(log, buffer, size)) #else void logger_init_mutexes(); LOGGER_HANDLE logger_open(const char path, unsigned long long size_limit, unsigned int rotations); int logger_close(LOGGER_HANDLE log); int logger_vprintf(LOGGER_HANDLE log, const char fmt, va_list argptr); int logger_printf(LOGGER_HANDLE log, const char fmt, ...); int logger_write(LOGGER_HANDLE log, const char buffer, size_t size); int logger_rotate(LOGGER_HANDLE log); #endif #ifdef __cplusplus } #endif #endif /MYSQL_SERVICE_LOGGER_INCLUDED*/ Back

Edit File : service_logger.h | Size : 3.47 KB

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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */

#ifndef MYSQL_SERVICE_LOGGER_INCLUDED
#define MYSQL_SERVICE_LOGGER_INCLUDED

#ifndef MYSQL_ABI_CHECK
#include <stdarg.h>
#endif

/**
  @file
  logger service

Log file with rotation implementation.

This service implements logging with possible rotation
  of the log files. Interface intentionally tries to be similar to FILE*
  related functions.

So that one can open the log with logger_open(), specifying
  the limit on the logfile size and the rotations number.

Then it's possible to write messages to the log with
  logger_printf or logger_vprintf functions.

As the size of the logfile grows over the specified limit,
  it is renamed to 'logfile.1'. The former 'logfile.1' becomes
  'logfile.2', etc. The file 'logfile.rotations' is removed.
  That's how the rotation works.

The rotation can be forced with the logger_rotate() call.

Finally the log should be closed with logger_close().

@notes:
  Implementation checks the size of the log file before it starts new
  printf into it. So the size of the file gets over the limit when it rotates.

The access is secured with the mutex, so the log is threadsafe.
*/

#ifdef __cplusplus
extern "C" {
#endif

typedef struct logger_handle_st LOGGER_HANDLE;

extern struct logger_service_st {
  void (*logger_init_mutexes)();
  LOGGER_HANDLE* (*open)(const char *path,
                         unsigned long long size_limit,
                         unsigned int rotations);
  int (*close)(LOGGER_HANDLE *log);
  int (*vprintf)(LOGGER_HANDLE *log, const char *fmt, va_list argptr);
  int (*printf)(LOGGER_HANDLE *log, const char *fmt, ...);
  int (*write)(LOGGER_HANDLE *log, const char *buffer, size_t size);
  int (*rotate)(LOGGER_HANDLE *log);
} *logger_service;

#ifdef MYSQL_DYNAMIC_PLUGIN

#define logger_init_mutexes logger_service->logger_init_mutexes
#define logger_open(path, size_limit, rotations) \
  (logger_service->open(path, size_limit, rotations))
#define logger_close(log) (logger_service->close(log))
#define logger_rotate(log) (logger_service->rotate(log))
#define logger_vprintf(log, fmt, argptr) (logger_service->\
    vprintf(log, fmt, argptr))
#define logger_printf (*logger_service->printf)
#define logger_write(log, buffer, size) \
  (logger_service->write(log, buffer, size))
#else

void logger_init_mutexes();
  LOGGER_HANDLE *logger_open(const char *path,
                             unsigned long long size_limit,
                             unsigned int rotations);
  int logger_close(LOGGER_HANDLE *log);
  int logger_vprintf(LOGGER_HANDLE *log, const char *fmt, va_list argptr);
  int logger_printf(LOGGER_HANDLE *log, const char *fmt, ...);
  int logger_write(LOGGER_HANDLE *log, const char *buffer, size_t size);
  int logger_rotate(LOGGER_HANDLE *log); 
#endif

#ifdef __cplusplus
}
#endif

#endif /*MYSQL_SERVICE_LOGGER_INCLUDED*/

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