logging.h

   1 /*
   2  * simple logging functions that can be expanded into nothing
   3  *
   4  * Copyright (C) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
   5  * Copyright (C) 2004-2006 Kay Sievers <kay.sievers@vrfy.org>
   6  *
   7  *      This program is free software; you can redistribute it and/or modify it
   8  *      under the terms of the GNU General Public License as published by the
   9  *      Free Software Foundation version 2 of the License.
  10  *
  11  *      This program is distributed in the hope that it will be useful, but
  12  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *      General Public License for more details.
  15  *
  16  *      You should have received a copy of the GNU General Public License along
  17  *      with this program; if not, write to the Free Software Foundation, Inc.,
  18  *      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  19  *
  20  */
  21
  22 #ifndef LOGGING_H
  23 #define LOGGING_H
  24
  25 #define err(format, arg...)             do { } while (0)
  26 #define info(format, arg...)            do { } while (0)
  27 #define dbg(format, arg...)             do { } while (0)
  28 #define logging_init(foo)               do { } while (0)
  29 #define logging_close(foo)              do { } while (0)
  30
  31 #ifdef USE_LOG
  32 #include <stdarg.h>
  33 #include <unistd.h>
  34 #include <syslog.h>
  35
  36 #undef err
  37 #define err(format, arg...)                                                     \
  38         do {                                                                    \
  39                 log_message(LOG_ERR ,"%s: " format ,__FUNCTION__ ,## arg);      \
  40         } while (0)
  41
  42 #undef info
  43 #define info(format, arg...)                                                    \
  44         do {                                                                    \
  45                 log_message(LOG_INFO ,"%s: " format ,__FUNCTION__ ,## arg);     \
  46         } while (0)
  47
  48 #ifdef DEBUG
  49 #undef dbg
  50 #define dbg(format, arg...)                                                     \
  51         do {                                                                    \
  52                 log_message(LOG_DEBUG ,"%s: " format ,__FUNCTION__ ,## arg);    \
  53         } while (0)
  54 #endif
  55
  56 extern void log_message(int priority, const char *format, ...)
  57         __attribute__ ((format (printf, 2, 3)));
  58
  59 #undef logging_init
  60 static inline void logging_init(const char *program_name)
  61 {
  62         openlog(program_name, LOG_PID | LOG_CONS, LOG_DAEMON);
  63 }
  64
  65 #undef logging_close
  66 static inline void logging_close(void)
  67 {
  68         closelog();
  69 }
  70
  71 #endif  /* USE_LOG */
  72
  73 #endif