src/helper/log.h

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   Copyright (C) 2008 by Spencer Oliver                                  *
   9  *   spen@spen-soft.co.uk                                                  *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  ***************************************************************************/
  26 #ifndef ERROR_H
  27 #define ERROR_H
  28
  29 #include "command.h"
  30
  31 /* To achieve C99 printf compatibility in MinGW, gnu_printf should */
  32 /* be used for __attribute__((format( ... )))                      */
  33 #ifdef IS_MINGW
  34 #define PRINTF_ATTRIBUTE_FORMAT gnu_printf
  35 #else
  36 #define PRINTF_ATTRIBUTE_FORMAT printf
  37 #endif
  38
  39 /* logging priorities
  40  * LOG_LVL_SILENT - turn off all output. In lieu of try + catch this can be used as a
  41  *                  feeble ersatz.
  42  * LOG_LVL_USER - user messages. Could be anything from information
  43  *                to progress messags. These messages do not represent
  44  *                incorrect or unexpected behaviour, just normal execution.
  45  * LOG_LVL_ERROR - fatal errors, that are likely to cause program abort
  46  * LOG_LVL_WARNING - non-fatal errors, that may be resolved later
  47  * LOG_LVL_INFO - state information, etc.
  48  * LOG_LVL_DEBUG - debug statements, execution trace
  49  */
  50 enum log_levels
  51 {
  52         LOG_LVL_SILENT = -3,
  53         LOG_LVL_OUTPUT = -2,
  54         LOG_LVL_USER = -1,
  55         LOG_LVL_ERROR = 0,
  56         LOG_LVL_WARNING = 1,
  57         LOG_LVL_INFO = 2,
  58         LOG_LVL_DEBUG = 3
  59 };
  60
  61 extern void log_printf(enum log_levels level, const char *file, int line,
  62         const char *function, const char *format, ...)
  63 __attribute__ ((format (PRINTF_ATTRIBUTE_FORMAT, 5, 6)));
  64 extern void log_printf_lf(enum log_levels level, const char *file, int line,
  65         const char *function, const char *format, ...)
  66 __attribute__ ((format (PRINTF_ATTRIBUTE_FORMAT, 5, 6)));
  67 extern int log_register_commands(struct command_context_s *cmd_ctx);
  68 extern int log_init(struct command_context_s *cmd_ctx);
  69 extern int set_log_output(struct command_context_s *cmd_ctx, FILE *output);
  70 extern void keep_alive(void);
  71 extern void kept_alive(void);
  72 extern void alive_sleep(int ms);
  73 extern void busy_sleep(int ms);
  74
  75
  76 /* log entries can be paused and replayed roughly according to the try/catch/rethrow
  77  * concepts in C++
  78  */
  79 void log_try(void);
  80 void log_catch(void);
  81 void log_rethrow(void);
  82
  83
  84 typedef void (*log_callback_fn)(void *priv, const char *file, int line,
  85                 const char *function, const char *string);
  86
  87 typedef struct log_callback_s
  88 {
  89         log_callback_fn fn;
  90         void *priv;
  91         struct log_callback_s *next;
  92 } log_callback_t;
  93
  94 extern int log_add_callback(log_callback_fn fn, void *priv);
  95 extern int log_remove_callback(log_callback_fn fn, void *priv);
  96
  97 char *alloc_vprintf(const char *fmt, va_list ap);
  98 char *alloc_printf(const char *fmt, ...);
  99
 100 extern int debug_level;
 101
 102 /* Avoid fn call and building parameter list if we're not outputting the information.
 103  * Matters on feeble CPUs for DEBUG/INFO statements that are involved frequently */
 104
 105 #define LOG_LEVEL_IS(FOO)  ((debug_level) >= (FOO))
 106
 107 #define LOG_DEBUG(expr ...) \
 108                 ((debug_level >= LOG_LVL_DEBUG) ? log_printf_lf (LOG_LVL_DEBUG, __FILE__, __LINE__, __FUNCTION__, expr) , 0 : 0)
 109
 110 #define LOG_INFO(expr ...) \
 111                 log_printf_lf (LOG_LVL_INFO, __FILE__, __LINE__, __FUNCTION__, expr)
 112
 113 #define LOG_INFO_N(expr ...) \
 114                 log_printf (LOG_LVL_INFO, __FILE__, __LINE__, __FUNCTION__, expr)
 115
 116 #define LOG_WARNING(expr ...) \
 117                 log_printf_lf (LOG_LVL_WARNING, __FILE__, __LINE__, __FUNCTION__, expr)
 118
 119 #define LOG_ERROR(expr ...) \
 120                 log_printf_lf (LOG_LVL_ERROR, __FILE__, __LINE__, __FUNCTION__, expr)
 121
 122 #define LOG_USER(expr ...) \
 123                 log_printf_lf (LOG_LVL_USER, __FILE__, __LINE__, __FUNCTION__, expr)
 124
 125 #define LOG_USER_N(expr ...) \
 126                 log_printf (LOG_LVL_USER, __FILE__, __LINE__, __FUNCTION__, expr)
 127
 128 #define LOG_OUTPUT(expr ...) \
 129                 log_printf (LOG_LVL_OUTPUT, __FILE__, __LINE__, __FUNCTION__, expr)
 130
 131 /* general failures
 132  * error codes < 100
 133  */
 134 #define ERROR_OK                                        (0)
 135 #define ERROR_INVALID_ARGUMENTS         ERROR_COMMAND_SYNTAX_ERROR
 136 #define ERROR_NO_CONFIG_FILE            (-2)
 137 #define ERROR_BUF_TOO_SMALL                     (-3)
 138 /* see "Error:" log entry for meaningful message to the user. The caller should
 139  * make no assumptions about what went wrong and try to handle the problem.
 140  */
 141 #define ERROR_FAIL                                      (-4)
 142
 143 #endif /* LOG_H */