src/helper/log.h

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifndef ERROR_H
  21 #define ERROR_H
  22
  23 #include "replacements.h"
  24 #include "command.h"
  25
  26 #include <stdarg.h>
  27
  28 /* logging priorities
  29  * LOG_USER - user messages. Could be anything from information
  30  *            to progress messags. These messages do not represent
  31  *            incorrect or unexpected behaviour, just normal execution.
  32  * LOG_ERROR - fatal errors, that are likely to cause program abort
  33  * LOG_WARNING - non-fatal errors, that may be resolved later
  34  * LOG_INFO - state information, etc.
  35  * LOG_DEBUG - debug statements, execution trace
  36  */
  37 enum log_levels
  38 {
  39         LOG_OUTPUT = -2,
  40         LOG_USER = -1,
  41         LOG_ERROR = 0,
  42         LOG_WARNING = 1,
  43         LOG_INFO = 2,
  44         LOG_DEBUG = 3
  45 };
  46
  47 extern void log_printf(enum log_levels level, const char *file, int line,
  48         const char *function, const char *format, ...)
  49 __attribute__ ((format (printf, 5, 6)));
  50 extern void log_printfnl(enum log_levels level, const char *file, int line,
  51         const char *function, const char *format, ...)
  52 __attribute__ ((format (printf, 5, 6)));
  53 extern int log_register_commands(struct command_context_s *cmd_ctx);
  54 extern int log_init(struct command_context_s *cmd_ctx);
  55 extern int set_log_output(struct command_context_s *cmd_ctx, FILE *output);
  56
  57 typedef void (*log_callback_fn)(void *priv, const char *file, int line,
  58                 const char *function, const char *format, va_list args);
  59
  60 typedef struct log_callback_s
  61 {
  62     log_callback_fn fn;
  63         void *priv;
  64     struct log_callback_s *next;
  65 } log_callback_t;
  66
  67 extern int log_add_callback(log_callback_fn fn, void *priv);
  68 extern int log_remove_callback(log_callback_fn fn, void *priv);
  69
  70 char *alloc_printf(const char *fmt, va_list ap);
  71
  72 extern int debug_level;
  73
  74 /* Avoid fn call and building parameter list if we're not outputting the information.
  75  * Matters on feeble CPUs for DEBUG/INFO statements that are involved frequently */
  76
  77
  78 #define DEBUG(expr ...) \
  79         do { if (debug_level >= LOG_DEBUG) \
  80                 log_printfnl (LOG_DEBUG, __FILE__, __LINE__, __FUNCTION__, expr); \
  81         } while(0)
  82
  83 #define INFO(expr ...) \
  84         do { if (debug_level >= LOG_INFO) \
  85                 log_printfnl (LOG_INFO, __FILE__, __LINE__, __FUNCTION__, expr); \
  86         } while(0)
  87
  88 #define INFO_SAMELINE(expr ...) \
  89         do { if (debug_level >= LOG_INFO) \
  90                 log_printf (LOG_INFO, __FILE__, __LINE__, __FUNCTION__, expr); \
  91         } while(0)
  92
  93 #define WARNING(expr ...) \
  94         do { \
  95                 log_printfnl (LOG_WARNING, __FILE__, __LINE__, __FUNCTION__, expr); \
  96         } while(0)
  97
  98 #define ERROR(expr ...) \
  99         do { \
 100                 log_printfnl (LOG_ERROR, __FILE__, __LINE__, __FUNCTION__, expr); \
 101         } while(0)
 102
 103 #define USER(expr ...) \
 104         do { \
 105                 log_printfnl (LOG_USER, __FILE__, __LINE__, __FUNCTION__, expr); \
 106         } while(0)
 107
 108 #define USER_SAMELINE(expr ...) \
 109         do { \
 110                 log_printf (LOG_USER, __FILE__, __LINE__, __FUNCTION__, expr); \
 111         } while(0)
 112
 113 #define OUTPUT(expr ...) \
 114         do { \
 115                 log_printf (LOG_OUTPUT, __FILE__, __LINE__, __FUNCTION__, expr); \
 116         } while(0)
 117
 118
 119 /* general failures
 120  * error codes < 100
 121  */
 122 #define ERROR_OK                                        (0)
 123 #define ERROR_INVALID_ARGUMENTS         (-1)
 124 #define ERROR_NO_CONFIG_FILE            (-2)
 125 #define ERROR_BUF_TOO_SMALL                     (-3)
 126
 127 #endif /* LOG_H */