src/common/error.hpp

   1 /*
   2  * Copyright (C) 2011 EfficiOS Inc.
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-only
   5  *
   6  */
   7
   8 #ifndef _ERROR_H
   9 #define _ERROR_H
  10
  11 #include <common/compat/errno.hpp>
  12 #include <common/compat/time.hpp>
  13 #include <common/format.hpp>
  14 #include <common/macros.hpp>
  15 #include <common/string-utils/format.hpp>
  16
  17 #include <stdbool.h>
  18 #include <stdint.h>
  19 #include <stdio.h>
  20 #include <string.h>
  21 #include <urcu/tls-compat.h>
  22
  23 #ifndef _GNU_SOURCE
  24 #error "lttng-tools error.h needs _GNU_SOURCE"
  25 #endif
  26
  27 #include <common/compat/tid.hpp>
  28
  29 #include <lttng/lttng-error.h>
  30
  31 /* Avoid conflict with Solaris <sys/regset.h> */
  32 #if defined(ERR) && defined(__sun__)
  33 #undef ERR
  34 #endif
  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: 00:00:00.000000000 plus NULL byte. */
  47         char str[19];
  48 };
  49
  50 extern thread_local const char *logger_thread_name;
  51
  52 extern int lttng_opt_quiet;
  53 extern int lttng_opt_verbose;
  54 extern int lttng_opt_mi;
  55
  56 /* Error type. */
  57 enum lttng_error_level {
  58         PRINT_ERR = 0,
  59         PRINT_BUG = 1,
  60         PRINT_WARN = 2,
  61         PRINT_MSG = 3,
  62         PRINT_DBG = 4,
  63         PRINT_DBG2 = 5,
  64         PRINT_DBG3 = 6,
  65 };
  66
  67 static inline bool __lttng_print_check_opt(enum lttng_error_level type)
  68 {
  69         /* lttng_opt_mi and lttng_opt_quiet. */
  70         switch (type) {
  71         case PRINT_DBG3:
  72         case PRINT_DBG2:
  73         case PRINT_DBG:
  74         case PRINT_MSG:
  75                 if (lttng_opt_mi) {
  76                         return false;
  77                 }
  78                 /* Fall-through. */
  79         case PRINT_WARN:
  80         case PRINT_BUG:
  81         case PRINT_ERR:
  82                 if (lttng_opt_quiet) {
  83                         return false;
  84                 }
  85         }
  86
  87         /* lttng_opt_verbose */
  88         switch (type) {
  89         case PRINT_DBG3:
  90                 if (lttng_opt_verbose < 3) {
  91                         return false;
  92                 }
  93                 break;
  94         case PRINT_DBG2:
  95                 if (lttng_opt_verbose < 2) {
  96                         return false;
  97                 }
  98                 break;
  99         case PRINT_DBG:
 100                 if (lttng_opt_verbose < 1) {
 101                         return false;
 102                 }
 103                 break;
 104         case PRINT_MSG:
 105         case PRINT_WARN:
 106         case PRINT_BUG:
 107         case PRINT_ERR:
 108                 break;
 109         }
 110
 111         return true;
 112 }
 113
 114 C_LINKAGE void lttng_abort_on_error(void);
 115
 116 static inline void __lttng_print_check_abort(enum lttng_error_level type)
 117 {
 118         switch (type) {
 119         case PRINT_DBG3:
 120         case PRINT_DBG2:
 121         case PRINT_DBG:
 122         case PRINT_MSG:
 123         case PRINT_WARN:
 124                 break;
 125         case PRINT_BUG:
 126         case PRINT_ERR:
 127                 lttng_abort_on_error();
 128         }
 129 }
 130
 131 /*
 132  * Macro for printing message depending on command line option and verbosity.
 133  *
 134  * Machine interface:
 135  * We use lttng_opt_mi to suppress all normal msg to stdout. We don't
 136  * want any nested msg to show up when printing mi to stdout(if it's the case).
 137  * All warnings and errors should be printed to stderr as normal.
 138  */
 139 #define __lttng_print(type, fmt, args...)                                            \
 140         do {                                                                         \
 141                 if (__lttng_print_check_opt(type)) {                                 \
 142                         fprintf((type) == PRINT_MSG ? stdout : stderr, fmt, ##args); \
 143                 }                                                                    \
 144                 __lttng_print_check_abort(type);                                     \
 145         } while (0)
 146
 147 /* Three level of debug. Use -v, -vv or -vvv for the levels */
 148 #define _ERRMSG(msg, type, fmt, args...)                                                  \
 149         do {                                                                              \
 150                 if (caa_unlikely(__lttng_print_check_opt(type))) {                        \
 151                         char generic_name[MAX_INT_DEC_LEN(long) + MAX_INT_DEC_LEN(long)]; \
 152                                                                                           \
 153                         snprintf(generic_name,                                            \
 154                                  sizeof(generic_name),                                    \
 155                                  "%ld/%ld",                                               \
 156                                  (long) getpid(),                                         \
 157                                  (long) lttng_gettid());                                  \
 158                                                                                           \
 159                         __lttng_print(type,                                               \
 160                                       msg " - %s [%s]: " fmt " (in %s() at " __FILE__     \
 161                                           ":" XSTR(__LINE__) ")\n",                       \
 162                                       log_add_time(),                                     \
 163                                       logger_thread_name ?: generic_name,                 \
 164                                       ##args,                                             \
 165                                       __func__);                                          \
 166                 }                                                                         \
 167         } while (0)
 168
 169 #define _ERRMSG_NO_LOC(msg, type, fmt, args...)                                           \
 170         do {                                                                              \
 171                 if (caa_unlikely(__lttng_print_check_opt(type))) {                        \
 172                         char generic_name[MAX_INT_DEC_LEN(long) + MAX_INT_DEC_LEN(long)]; \
 173                                                                                           \
 174                         snprintf(generic_name,                                            \
 175                                  sizeof(generic_name),                                    \
 176                                  "%ld/%ld",                                               \
 177                                  (long) getpid(),                                         \
 178                                  (long) lttng_gettid());                                  \
 179                                                                                           \
 180                         __lttng_print(type,                                               \
 181                                       msg " - %s [%s]: " fmt "\n",                        \
 182                                       log_add_time(),                                     \
 183                                       logger_thread_name ?: generic_name,                 \
 184                                       ##args);                                            \
 185                 }                                                                         \
 186         } while (0)
 187
 188 #define MSG(fmt, args...)  __lttng_print(PRINT_MSG, fmt "\n", ##args)
 189 #define _MSG(fmt, args...) __lttng_print(PRINT_MSG, fmt, ##args)
 190 #define ERR(fmt, args...)  __lttng_print(PRINT_ERR, "Error: " fmt "\n", ##args)
 191 #define WARN(fmt, args...) __lttng_print(PRINT_WARN, "Warning: " fmt "\n", ##args)
 192
 193 #define BUG(fmt, args...) _ERRMSG("BUG", PRINT_BUG, fmt, ##args)
 194
 195 #define DBG(fmt, args...)        _ERRMSG("DBG1", PRINT_DBG, fmt, ##args)
 196 #define DBG_NO_LOC(fmt, args...) _ERRMSG_NO_LOC("DBG1", PRINT_DBG, fmt, ##args)
 197 #define DBG2(fmt, args...)       _ERRMSG("DBG2", PRINT_DBG2, fmt, ##args)
 198 #define DBG3(fmt, args...)       _ERRMSG("DBG3", PRINT_DBG3, fmt, ##args)
 199 #define LOG(type, fmt, args...)            \
 200         do {                               \
 201                 switch (type) {            \
 202                 case PRINT_ERR:            \
 203                         ERR(fmt, ##args);  \
 204                         break;             \
 205                 case PRINT_WARN:           \
 206                         WARN(fmt, ##args); \
 207                         break;             \
 208                 case PRINT_BUG:            \
 209                         BUG(fmt, ##args);  \
 210                         break;             \
 211                 case PRINT_MSG:            \
 212                         MSG(fmt, ##args);  \
 213                         break;             \
 214                 case PRINT_DBG:            \
 215                         DBG(fmt, ##args);  \
 216                         break;             \
 217                 case PRINT_DBG2:           \
 218                         DBG2(fmt, ##args); \
 219                         break;             \
 220                 case PRINT_DBG3:           \
 221                         DBG3(fmt, ##args); \
 222                         break;             \
 223                 default:                   \
 224                         abort();           \
 225                 }                          \
 226         } while (0);
 227
 228 #define _PERROR(fmt, args...) _ERRMSG("PERROR", PRINT_ERR, fmt, ##args)
 229
 230 #if !defined(__GLIBC__) || \
 231         ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE))
 232
 233 /*
 234  * Version using XSI strerror_r.
 235  */
 236 #define PERROR(call, args...)                                        \
 237         do {                                                         \
 238                 char _perror_buf[200];                               \
 239                 strerror_r(errno, _perror_buf, sizeof(_perror_buf)); \
 240                 _PERROR(call ": %s", ##args, _perror_buf);           \
 241         } while (0);
 242 #else
 243 /*
 244  * Version using GNU strerror_r, for linux with appropriate defines.
 245  */
 246 #define PERROR(call, args...)                                                      \
 247         do {                                                                       \
 248                 char *_perror_buf;                                                 \
 249                 char _perror_tmp[200];                                             \
 250                 _perror_buf = strerror_r(errno, _perror_tmp, sizeof(_perror_tmp)); \
 251                 _PERROR(call ": %s", ##args, _perror_buf);                         \
 252         } while (0);
 253 #endif
 254
 255 const char *error_get_str(int32_t code);
 256
 257 namespace lttng {
 258 namespace logging {
 259 namespace details {
 260 [[noreturn]] void die_formatting_exception(const char *format,
 261                                            const std::exception& formatting_exception);
 262 } /* namespace details */
 263 } /* namespace logging */
 264 } /* namespace lttng */
 265
 266 #define DBG_FMT(format_str, args...)                                                              \
 267         do {                                                                                      \
 268                 try {                                                                             \
 269                         DBG("%s", lttng::format(format_str, ##args).c_str());                     \
 270                 } catch (const std::exception& _formatting_exception) {                           \
 271                         lttng::logging::details::die_formatting_exception(format_str,             \
 272                                                                           _formatting_exception); \
 273                 }                                                                                 \
 274         } while (0);
 275
 276 #define WARN_FMT(format_str, args...)                                                             \
 277         do {                                                                                      \
 278                 try {                                                                             \
 279                         WARN("%s", lttng::format(format_str, ##args).c_str());                    \
 280                 } catch (const std::exception& _formatting_exception) {                           \
 281                         lttng::logging::details::die_formatting_exception(format_str,             \
 282                                                                           _formatting_exception); \
 283                 }                                                                                 \
 284         } while (0);
 285
 286 #define ERR_FMT(format_str, args...)                                                              \
 287         do {                                                                                      \
 288                 try {                                                                             \
 289                         ERR("%s", lttng::format(format_str, ##args).c_str());                     \
 290                 } catch (const std::exception& _formatting_exception) {                           \
 291                         lttng::logging::details::die_formatting_exception(format_str,             \
 292                                                                           _formatting_exception); \
 293                 }                                                                                 \
 294         } while (0);
 295
 296 /*
 297  * Function that format the time and return the reference of log_time.str to
 298  * the caller. On error, an empty string is returned thus no time will be
 299  * printed in the log.
 300  */
 301 const char *log_add_time();
 302
 303 /* Name must be a statically-allocated string. */
 304 void logger_set_thread_name(const char *name, bool set_pthread_name);
 305
 306 #endif /* _ERROR_H */