src/common/error.h

   1 /*
   2  * Copyright (C)  2011 - David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License, version 2 only,
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #ifndef _ERROR_H
  19 #define _ERROR_H
  20
  21 #include <errno.h>
  22 #include <stdio.h>
  23 #include <stdint.h>
  24 #include <string.h>
  25 #include <stdbool.h>
  26 #include <urcu/tls-compat.h>
  27 #include <time.h>
  28
  29 #ifndef _GNU_SOURCE
  30 #error "lttng-tools error.h needs _GNU_SOURCE"
  31 #endif
  32
  33 #include <lttng/lttng-error.h>
  34 #include <common/compat/tid.h>
  35
  36 /* Stringify the expansion of a define */
  37 #define XSTR(d) STR(d)
  38 #define STR(s) #s
  39
  40 /*
  41  * Contains the string of the log entry time. This is used as a thread local
  42  * storage so we don't race between thread and also avoid memory allocation
  43  * every time a log is fired.
  44  */
  45 struct log_time {
  46         /* Format: 00:00:00.000000 plus NULL byte. */
  47         char str[16];
  48 };
  49 extern DECLARE_URCU_TLS(struct log_time, error_log_time);
  50
  51 extern int lttng_opt_quiet;
  52 extern int lttng_opt_verbose;
  53 extern int lttng_opt_mi;
  54
  55 /* Error type. */
  56 enum lttng_error_level {
  57         PRINT_ERR =     0,
  58         PRINT_BUG =     1,
  59         PRINT_WARN =    2,
  60         PRINT_MSG =     3,
  61         PRINT_DBG =     4,
  62         PRINT_DBG2 =    5,
  63         PRINT_DBG3 =    6,
  64 };
  65
  66 static inline bool __lttng_print_check_opt(enum lttng_error_level type)
  67 {
  68         /* lttng_opt_mi and lttng_opt_quiet. */
  69         switch (type) {
  70         case PRINT_DBG3:
  71         case PRINT_DBG2:
  72         case PRINT_DBG:
  73         case PRINT_MSG:
  74                 if (lttng_opt_mi) {
  75                         return false;
  76                 }
  77                 /* Fall-through. */
  78         case PRINT_WARN:
  79         case PRINT_BUG:
  80         case PRINT_ERR:
  81                 if (lttng_opt_quiet) {
  82                         return false;
  83                 }
  84         }
  85
  86         /* lttng_opt_verbose */
  87         switch (type) {
  88         case PRINT_DBG3:
  89                 if (lttng_opt_verbose < 3) {
  90                         return false;
  91                 }
  92                 break;
  93         case PRINT_DBG2:
  94                 if (lttng_opt_verbose < 2) {
  95                         return false;
  96                 }
  97                 break;
  98         case PRINT_DBG:
  99                 if (lttng_opt_verbose < 1) {
 100                         return false;
 101                 }
 102                 break;
 103         case PRINT_MSG:
 104         case PRINT_WARN:
 105         case PRINT_BUG:
 106         case PRINT_ERR:
 107                 break;
 108         }
 109
 110         return true;
 111 }
 112
 113 /*
 114  * Macro for printing message depending on command line option and verbosity.
 115  *
 116  * Machine interface:
 117  * We use lttng_opt_mi to suppress all normal msg to stdout. We don't
 118  * want any nested msg to show up when printing mi to stdout(if it's the case).
 119  * All warnings and errors should be printed to stderr as normal.
 120  */
 121 #define __lttng_print(type, fmt, args...)                                               \
 122         do {                                                                            \
 123                 if (__lttng_print_check_opt(type)) {                                    \
 124                         fprintf((type) == PRINT_MSG ? stdout : stderr, fmt, ## args);   \
 125                 }                                                                       \
 126         } while (0)
 127
 128 /* Three level of debug. Use -v, -vv or -vvv for the levels */
 129 #define _ERRMSG(msg, type, fmt, args...) __lttng_print(type, msg \
 130                 " - %s [%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" XSTR(__LINE__) ")\n", \
 131                         log_add_time(), (long) getpid(), (long) gettid(), ## args, __func__)
 132
 133 #define MSG(fmt, args...) \
 134         __lttng_print(PRINT_MSG, fmt "\n", ## args)
 135 #define _MSG(fmt, args...) \
 136         __lttng_print(PRINT_MSG, fmt, ## args)
 137 #define ERR(fmt, args...) \
 138         __lttng_print(PRINT_ERR, "Error: " fmt "\n", ## args)
 139 #define WARN(fmt, args...) \
 140         __lttng_print(PRINT_WARN, "Warning: " fmt "\n", ## args)
 141
 142 #define BUG(fmt, args...) _ERRMSG("BUG", PRINT_BUG, fmt, ## args)
 143
 144 #define DBG(fmt, args...) _ERRMSG("DEBUG1", PRINT_DBG, fmt, ## args)
 145 #define DBG2(fmt, args...) _ERRMSG("DEBUG2", PRINT_DBG2, fmt, ## args)
 146 #define DBG3(fmt, args...) _ERRMSG("DEBUG3", PRINT_DBG3, fmt, ## args)
 147
 148 #define _PERROR(fmt, args...) _ERRMSG("PERROR", PRINT_ERR, fmt, ## args)
 149
 150 #if !defined(__linux__) || ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE))
 151
 152 /*
 153  * Version using XSI strerror_r.
 154  */
 155 #define PERROR(call, args...) \
 156         do { \
 157                 char buf[200]; \
 158                 strerror_r(errno, buf, sizeof(buf)); \
 159                 _PERROR(call ": %s", ## args, buf); \
 160         } while(0);
 161 #else
 162 /*
 163  * Version using GNU strerror_r, for linux with appropriate defines.
 164  */
 165 #define PERROR(call, args...) \
 166         do { \
 167                 char *buf; \
 168                 char tmp[200]; \
 169                 buf = strerror_r(errno, tmp, sizeof(tmp)); \
 170                 _PERROR(call ": %s", ## args, buf); \
 171         } while(0);
 172 #endif
 173
 174 const char *error_get_str(int32_t code);
 175
 176 /*
 177  * Function that format the time and return the reference of log_time.str to
 178  * the caller. On error, an empty string is returned thus no time will be
 179  * printed in the log.
 180  */
 181 const char *log_add_time();
 182
 183 #endif /* _ERROR_H */