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
  27 #ifndef ERROR_H
  28 #define ERROR_H
  29
  30 #include <helper/command.h>
  31
  32 /* To achieve C99 printf compatibility in MinGW, gnu_printf should be
  33  * used for __attribute__((format( ... ))), with GCC v4.4 or later
  34  */
  35 #if (defined(IS_MINGW) && (((__GNUC__ << 16) + __GNUC_MINOR__) >= 0x00040004))
  36 #define PRINTF_ATTRIBUTE_FORMAT gnu_printf
  37 #else
  38 #define PRINTF_ATTRIBUTE_FORMAT printf
  39 #endif
  40
  41 /* logging priorities
  42  * LOG_LVL_SILENT - turn off all output. In lieu of try + catch this can be used as a
  43  *                  feeble ersatz.
  44  * LOG_LVL_USER - user messages. Could be anything from information
  45  *                to progress messags. These messages do not represent
  46  *                incorrect or unexpected behaviour, just normal execution.
  47  * LOG_LVL_ERROR - fatal errors, that are likely to cause program abort
  48  * LOG_LVL_WARNING - non-fatal errors, that may be resolved later
  49  * LOG_LVL_INFO - state information, etc.
  50  * LOG_LVL_DEBUG - debug statements, execution trace
  51  */
  52 enum log_levels {
  53         LOG_LVL_SILENT = -3,
  54         LOG_LVL_OUTPUT = -2,
  55         LOG_LVL_USER = -1,
  56         LOG_LVL_ERROR = 0,
  57         LOG_LVL_WARNING = 1,
  58         LOG_LVL_INFO = 2,
  59         LOG_LVL_DEBUG = 3
  60 };
  61
  62 void log_printf(enum log_levels level, const char *file, unsigned line,
  63                 const char *function, const char *format, ...)
  64 __attribute__ ((format (PRINTF_ATTRIBUTE_FORMAT, 5, 6)));
  65 void log_printf_lf(enum log_levels level, const char *file, unsigned line,
  66                 const char *function, const char *format, ...)
  67 __attribute__ ((format (PRINTF_ATTRIBUTE_FORMAT, 5, 6)));
  68
  69 /**
  70  * Initialize logging module.  Call during program startup.
  71  */
  72 void log_init(void);
  73 int set_log_output(struct command_context *cmd_ctx, FILE *output);
  74
  75 int log_register_commands(struct command_context *cmd_ctx);
  76
  77 void keep_alive(void);
  78 void kept_alive(void);
  79
  80 void alive_sleep(uint64_t ms);
  81 void busy_sleep(uint64_t ms);
  82
  83 typedef void (*log_callback_fn)(void *priv, const char *file, unsigned line,
  84                 const char *function, const char *string);
  85
  86 struct log_callback {
  87         log_callback_fn fn;
  88         void *priv;
  89         struct log_callback *next;
  90 };
  91
  92 int log_add_callback(log_callback_fn fn, void *priv);
  93 int log_remove_callback(log_callback_fn fn, void *priv);
  94
  95 char *alloc_vprintf(const char *fmt, va_list ap);
  96 char *alloc_printf(const char *fmt, ...);
  97
  98 extern int debug_level;
  99
 100 /* Avoid fn call and building parameter list if we're not outputting the information.
 101  * Matters on feeble CPUs for DEBUG/INFO statements that are involved frequently */
 102
 103 #define LOG_LEVEL_IS(FOO)  ((debug_level) >= (FOO))
 104
 105 #define LOG_DEBUG(expr ...) \
 106         do { \
 107                 if (debug_level >= LOG_LVL_DEBUG) \
 108                         log_printf_lf(LOG_LVL_DEBUG, \
 109                                 __FILE__, __LINE__, __func__, \
 110                                 expr); \
 111         } while (0)
 112
 113 #define LOG_INFO(expr ...) \
 114         log_printf_lf(LOG_LVL_INFO, __FILE__, __LINE__, __func__, expr)
 115
 116 #define LOG_WARNING(expr ...) \
 117         log_printf_lf(LOG_LVL_WARNING, __FILE__, __LINE__, __func__, expr)
 118
 119 #define LOG_ERROR(expr ...) \
 120         log_printf_lf(LOG_LVL_ERROR, __FILE__, __LINE__, __func__, expr)
 121
 122 #define LOG_USER(expr ...) \
 123         log_printf_lf(LOG_LVL_USER, __FILE__, __LINE__, __func__, expr)
 124
 125 #define LOG_USER_N(expr ...) \
 126         log_printf(LOG_LVL_USER, __FILE__, __LINE__, __func__, expr)
 127
 128 #define LOG_OUTPUT(expr ...) \
 129         log_printf(LOG_LVL_OUTPUT, __FILE__, __LINE__, __func__, expr)
 130
 131 /* general failures
 132  * error codes < 100
 133  */
 134 #define ERROR_OK                                                (0)
 135 #define ERROR_NO_CONFIG_FILE                    (-2)
 136 #define ERROR_BUF_TOO_SMALL                             (-3)
 137 /* see "Error:" log entry for meaningful message to the user. The caller should
 138  * make no assumptions about what went wrong and try to handle the problem.
 139  */
 140 #define ERROR_FAIL                                              (-4)
 141
 142 #endif  /* LOG_H */