logging.h

   1 /*
   2  * logging.h
   3  *
   4  * Simple logging functions that can be compiled away into nothing.
   5  *
   6  * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
   7  * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
   8  *
   9  *      This program is free software; you can redistribute it and/or modify it
  10  *      under the terms of the GNU General Public License as published by the
  11  *      Free Software Foundation version 2 of the License.
  12  *
  13  *      This program is distributed in the hope that it will be useful, but
  14  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *      General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License along
  19  *      with this program; if not, write to the Free Software Foundation, Inc.,
  20  *      675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  */
  23
  24 #ifndef LOGGING_H
  25 #define LOGGING_H
  26
  27 #define info(format, arg...)            do { } while (0)
  28 #define dbg(format, arg...)             do { } while (0)
  29 #define dbg_parse(format, arg...)       do { } while (0)
  30 #define init_logging(foo)               do { } while (0)
  31
  32 #ifdef LOG
  33 #include <stdarg.h>
  34 #include <unistd.h>
  35 #include <syslog.h>
  36
  37 #define LOGNAME_SIZE                    42
  38
  39 #undef info
  40 #define info(format, arg...)                                                            \
  41         do {                                                                            \
  42                 log_message(LOG_INFO , format , ## arg);                                \
  43         } while (0)
  44
  45 #ifdef DEBUG
  46 #undef dbg
  47 #define dbg(format, arg...)                                                             \
  48         do {                                                                            \
  49                 log_message(LOG_DEBUG , "%s: " format , __FUNCTION__ , ## arg); \
  50         } while (0)
  51 #endif
  52
  53 /* Parser needs it's own debugging statement, we usually don't care about this at all */
  54 #ifdef DEBUG_PARSER
  55 #undef dbg_parse
  56 #define dbg_parse(format, arg...)                                                       \
  57         do {                                                                            \
  58                 log_message(LOG_DEBUG , "%s: " format , __FUNCTION__ , ## arg); \
  59         } while (0)
  60 #endif
  61
  62 extern void log_message(int level, const char *format, ...)
  63         __attribute__ ((format (printf, 2, 3)));
  64
  65 /* each program that uses syslog must declare this variable somewhere */
  66 extern unsigned char logname[LOGNAME_SIZE];
  67
  68 #undef init_logging
  69 static inline void init_logging(char *program_name)
  70 {
  71         snprintf(logname, LOGNAME_SIZE,"%s[%d]", program_name, getpid());
  72         openlog(logname, 0, LOG_DAEMON);
  73 }
  74
  75 #endif  /* LOG */
  76
  77 #endif