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, see <http://www.gnu.org/licenses/>. *
  23  ***************************************************************************/
  24
  25 #ifndef ERROR_H
  26 #define ERROR_H
  27
  28 #include <helper/command.h>
  29
  30 /* To achieve C99 printf compatibility in MinGW, gnu_printf should be
  31  * used for __attribute__((format( ... ))), with GCC v4.4 or later
  32  */
  33 #if (defined(IS_MINGW) && (((__GNUC__ << 16) + __GNUC_MINOR__) >= 0x00040004))
  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         LOG_LVL_SILENT = -3,
  52         LOG_LVL_OUTPUT = -2,
  53         LOG_LVL_USER = -1,
  54         LOG_LVL_ERROR = 0,
  55         LOG_LVL_WARNING = 1,
  56         LOG_LVL_INFO = 2,
  57         LOG_LVL_DEBUG = 3
  58 };
  59
  60 void log_printf(enum log_levels level, const char *file, unsigned line,
  61                 const char *function, const char *format, ...)
  62 __attribute__ ((format (PRINTF_ATTRIBUTE_FORMAT, 5, 6)));
  63 void log_printf_lf(enum log_levels level, const char *file, unsigned line,
  64                 const char *function, const char *format, ...)
  65 __attribute__ ((format (PRINTF_ATTRIBUTE_FORMAT, 5, 6)));
  66
  67 /**
  68  * Initialize logging module.  Call during program startup.
  69  */
  70 void log_init(void);
  71 int set_log_output(struct command_context *cmd_ctx, FILE *output);
  72
  73 int log_register_commands(struct command_context *cmd_ctx);
  74
  75 void keep_alive(void);
  76 void kept_alive(void);
  77
  78 void alive_sleep(uint64_t ms);
  79 void busy_sleep(uint64_t ms);
  80
  81 typedef void (*log_callback_fn)(void *priv, const char *file, unsigned line,
  82                 const char *function, const char *string);
  83
  84 struct log_callback {
  85         log_callback_fn fn;
  86         void *priv;
  87         struct log_callback *next;
  88 };
  89
  90 int log_add_callback(log_callback_fn fn, void *priv);
  91 int log_remove_callback(log_callback_fn fn, void *priv);
  92
  93 char *alloc_vprintf(const char *fmt, va_list ap);
  94 char *alloc_printf(const char *fmt, ...);
  95
  96 extern int debug_level;
  97
  98 /* Avoid fn call and building parameter list if we're not outputting the information.
  99  * Matters on feeble CPUs for DEBUG/INFO statements that are involved frequently */
 100
 101 #define LOG_LEVEL_IS(FOO)  ((debug_level) >= (FOO))
 102
 103 #define LOG_DEBUG(expr ...) \
 104         do { \
 105                 if (debug_level >= LOG_LVL_DEBUG) \
 106                         log_printf_lf(LOG_LVL_DEBUG, \
 107                                 __FILE__, __LINE__, __func__, \
 108                                 expr); \
 109         } while (0)
 110
 111 #define LOG_INFO(expr ...) \
 112         log_printf_lf(LOG_LVL_INFO, __FILE__, __LINE__, __func__, expr)
 113
 114 #define LOG_WARNING(expr ...) \
 115         log_printf_lf(LOG_LVL_WARNING, __FILE__, __LINE__, __func__, expr)
 116
 117 #define LOG_ERROR(expr ...) \
 118         log_printf_lf(LOG_LVL_ERROR, __FILE__, __LINE__, __func__, expr)
 119
 120 #define LOG_USER(expr ...) \
 121         log_printf_lf(LOG_LVL_USER, __FILE__, __LINE__, __func__, expr)
 122
 123 #define LOG_USER_N(expr ...) \
 124         log_printf(LOG_LVL_USER, __FILE__, __LINE__, __func__, expr)
 125
 126 #define LOG_OUTPUT(expr ...) \
 127         log_printf(LOG_LVL_OUTPUT, __FILE__, __LINE__, __func__, expr)
 128
 129 /* general failures
 130  * error codes < 100
 131  */
 132 #define ERROR_OK                                                (0)
 133 #define ERROR_NO_CONFIG_FILE                    (-2)
 134 #define ERROR_BUF_TOO_SMALL                             (-3)
 135 /* see "Error:" log entry for meaningful message to the user. The caller should
 136  * make no assumptions about what went wrong and try to handle the problem.
 137  */
 138 #define ERROR_FAIL                                              (-4)
 139 #define ERROR_WAIT                                              (-5)
 140
 141
 142 #endif  /* LOG_H */