src/common/error.h

   1 /*
   2  * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #ifndef _ERROR_H
   9 #define _ERROR_H
  10
  11 #include <common/compat/errno.h>
  12 #include <stdio.h>
  13 #include <stdint.h>
  14 #include <string.h>
  15 #include <stdbool.h>
  16 #include <urcu/tls-compat.h>
  17 #include <common/compat/time.h>
  18 #include <common/string-utils/format.h>
  19 #include <common/macros.h>
  20
  21 #ifndef _GNU_SOURCE
  22 #error "lttng-tools error.h needs _GNU_SOURCE"
  23 #endif
  24
  25 #include <lttng/lttng-error.h>
  26 #include <common/compat/tid.h>
  27
  28 /* Avoid conflict with Solaris <sys/regset.h> */
  29 #if defined(ERR) && defined(__sun__)
  30 #undef ERR
  31 #endif
  32
  33 /* Stringify the expansion of a define */
  34 #define XSTR(d) STR(d)
  35 #define STR(s) #s
  36
  37 /*
  38  * Contains the string of the log entry time. This is used as a thread local
  39  * storage so we don't race between thread and also avoid memory allocation
  40  * every time a log is fired.
  41  */
  42 struct log_time {
  43         /* Format: 00:00:00.000000000 plus NULL byte. */
  44         char str[19];
  45 };
  46 extern DECLARE_URCU_TLS(struct log_time, error_log_time);
  47 extern DECLARE_URCU_TLS(const char *, logger_thread_name);
  48
  49 extern int lttng_opt_quiet;
  50 extern int lttng_opt_verbose;
  51 extern int lttng_opt_mi;
  52
  53 /* Error type. */
  54 enum lttng_error_level {
  55         PRINT_ERR =     0,
  56         PRINT_BUG =     1,
  57         PRINT_WARN =    2,
  58         PRINT_MSG =     3,
  59         PRINT_DBG =     4,
  60         PRINT_DBG2 =    5,
  61         PRINT_DBG3 =    6,
  62 };
  63
  64 static inline bool __lttng_print_check_opt(enum lttng_error_level type)
  65 {
  66         /* lttng_opt_mi and lttng_opt_quiet. */
  67         switch (type) {
  68         case PRINT_DBG3:
  69         case PRINT_DBG2:
  70         case PRINT_DBG:
  71         case PRINT_MSG:
  72                 if (lttng_opt_mi) {
  73                         return false;
  74                 }
  75                 /* Fall-through. */
  76         case PRINT_WARN:
  77         case PRINT_BUG:
  78         case PRINT_ERR:
  79                 if (lttng_opt_quiet) {
  80                         return false;
  81                 }
  82         }
  83
  84         /* lttng_opt_verbose */
  85         switch (type) {
  86         case PRINT_DBG3:
  87                 if (lttng_opt_verbose < 3) {
  88                         return false;
  89                 }
  90                 break;
  91         case PRINT_DBG2:
  92                 if (lttng_opt_verbose < 2) {
  93                         return false;
  94                 }
  95                 break;
  96         case PRINT_DBG:
  97                 if (lttng_opt_verbose < 1) {
  98                         return false;
  99                 }
 100                 break;
 101         case PRINT_MSG:
 102         case PRINT_WARN:
 103         case PRINT_BUG:
 104         case PRINT_ERR:
 105                 break;
 106         }
 107
 108         return true;
 109 }
 110
 111 void lttng_abort_on_error(void);
 112
 113 static inline void __lttng_print_check_abort(enum lttng_error_level type)
 114 {
 115         switch (type) {
 116         case PRINT_DBG3:
 117         case PRINT_DBG2:
 118         case PRINT_DBG:
 119         case PRINT_MSG:
 120         case PRINT_WARN:
 121                 break;
 122         case PRINT_BUG:
 123         case PRINT_ERR:
 124                 lttng_abort_on_error();
 125         }
 126 }
 127
 128 /*
 129  * Macro for printing message depending on command line option and verbosity.
 130  *
 131  * Machine interface:
 132  * We use lttng_opt_mi to suppress all normal msg to stdout. We don't
 133  * want any nested msg to show up when printing mi to stdout(if it's the case).
 134  * All warnings and errors should be printed to stderr as normal.
 135  */
 136 #define __lttng_print(type, fmt, args...)                                               \
 137         do {                                                                            \
 138                 if (__lttng_print_check_opt(type)) {                                    \
 139                         fprintf((type) == PRINT_MSG ? stdout : stderr, fmt, ## args);   \
 140                 }                                                                       \
 141                 __lttng_print_check_abort(type);                                        \
 142         } while (0)
 143
 144 /* Three level of debug. Use -v, -vv or -vvv for the levels */
 145 #define _ERRMSG(msg, type, fmt, args...)                                \
 146         do {                                                            \
 147                 if (caa_unlikely(__lttng_print_check_opt(type))) {      \
 148                         char generic_name[MAX_INT_DEC_LEN(long) +       \
 149                                           MAX_INT_DEC_LEN(long)];       \
 150                                                                         \
 151                         snprintf(generic_name, sizeof(generic_name),    \
 152                                         "%ld/%ld", (long) getpid(),     \
 153                                         (long) lttng_gettid());         \
 154                                                                         \
 155                         __lttng_print(type,                             \
 156                                         msg " - %s [%s]: " fmt          \
 157                                             " (in %s() at " __FILE__    \
 158                                             ":" XSTR(__LINE__) ")\n",   \
 159                                         log_add_time(),                 \
 160                                         URCU_TLS(logger_thread_name) ?: \
 161                                                         generic_name,   \
 162                                         ##args, __func__);              \
 163                 }                                                       \
 164         } while (0)
 165
 166 #define _ERRMSG_NO_LOC(msg, type, fmt, args...)                          \
 167         do {                                                             \
 168                 if (caa_unlikely(__lttng_print_check_opt(type))) {       \
 169                         char generic_name[MAX_INT_DEC_LEN(long) +        \
 170                                           MAX_INT_DEC_LEN(long)];        \
 171                                                                          \
 172                         snprintf(generic_name, sizeof(generic_name),     \
 173                                         "%ld/%ld", (long) getpid(),      \
 174                                         (long) lttng_gettid());          \
 175                                                                          \
 176                         __lttng_print(type, msg " - %s [%s]: " fmt "\n", \
 177                                         log_add_time(),                  \
 178                                         URCU_TLS(logger_thread_name) ?:  \
 179                                                         generic_name,    \
 180                                         ##args);                         \
 181                 }                                                        \
 182         } while (0)
 183
 184 #define MSG(fmt, args...) \
 185         __lttng_print(PRINT_MSG, fmt "\n", ## args)
 186 #define _MSG(fmt, args...) \
 187         __lttng_print(PRINT_MSG, fmt, ## args)
 188 #define ERR(fmt, args...) \
 189         __lttng_print(PRINT_ERR, "Error: " fmt "\n", ## args)
 190 #define WARN(fmt, args...) \
 191         __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                         assert(0);              \
 225                 }                               \
 226         } while(0);
 227
 228 #define _PERROR(fmt, args...) _ERRMSG("PERROR", PRINT_ERR, fmt, ## args)
 229
 230 #if !defined(__GLIBC__) || ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE))
 231
 232 /*
 233  * Version using XSI strerror_r.
 234  */
 235 #define PERROR(call, args...)                                        \
 236         do {                                                         \
 237                 char _perror_buf[200];                               \
 238                 strerror_r(errno, _perror_buf, sizeof(_perror_buf)); \
 239                 _PERROR(call ": %s", ##args, _perror_buf);           \
 240         } while (0);
 241 #else
 242 /*
 243  * Version using GNU strerror_r, for linux with appropriate defines.
 244  */
 245 #define PERROR(call, args...)                                             \
 246         do {                                                              \
 247                 char *_perror_buf;                                        \
 248                 char _perror_tmp[200];                                    \
 249                 _perror_buf = strerror_r(                                 \
 250                                 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 /*
 258  * Function that format the time and return the reference of log_time.str to
 259  * the caller. On error, an empty string is returned thus no time will be
 260  * printed in the log.
 261  */
 262 const char *log_add_time(void);
 263
 264 /* Name must be a statically-allocated string. */
 265 LTTNG_HIDDEN
 266 void logger_set_thread_name(const char *name, bool set_pthread_name);
 267
 268 #endif /* _ERROR_H */