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 <common/compat/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 /* Avoid conflict with Solaris <sys/regset.h> */
  37 #if defined(ERR) && defined(__sun__)
  38 #undef ERR
  39 #endif
  40
  41 /* Stringify the expansion of a define */
  42 #define XSTR(d) STR(d)
  43 #define STR(s) #s
  44
  45 /*
  46  * Contains the string of the log entry time. This is used as a thread local
  47  * storage so we don't race between thread and also avoid memory allocation
  48  * every time a log is fired.
  49  */
  50 struct log_time {
  51         /* Format: 00:00:00.000000 plus NULL byte. */
  52         char str[16];
  53 };
  54 extern DECLARE_URCU_TLS(struct log_time, error_log_time);
  55
  56 extern int lttng_opt_quiet;
  57 extern int lttng_opt_verbose;
  58 extern int lttng_opt_mi;
  59
  60 /* Error type. */
  61 enum lttng_error_level {
  62         PRINT_ERR =     0,
  63         PRINT_BUG =     1,
  64         PRINT_WARN =    2,
  65         PRINT_MSG =     3,
  66         PRINT_DBG =     4,
  67         PRINT_DBG2 =    5,
  68         PRINT_DBG3 =    6,
  69 };
  70
  71 static inline bool __lttng_print_check_opt(enum lttng_error_level type)
  72 {
  73         /* lttng_opt_mi and lttng_opt_quiet. */
  74         switch (type) {
  75         case PRINT_DBG3:
  76         case PRINT_DBG2:
  77         case PRINT_DBG:
  78         case PRINT_MSG:
  79                 if (lttng_opt_mi) {
  80                         return false;
  81                 }
  82                 /* Fall-through. */
  83         case PRINT_WARN:
  84         case PRINT_BUG:
  85         case PRINT_ERR:
  86                 if (lttng_opt_quiet) {
  87                         return false;
  88                 }
  89         }
  90
  91         /* lttng_opt_verbose */
  92         switch (type) {
  93         case PRINT_DBG3:
  94                 if (lttng_opt_verbose < 3) {
  95                         return false;
  96                 }
  97                 break;
  98         case PRINT_DBG2:
  99                 if (lttng_opt_verbose < 2) {
 100                         return false;
 101                 }
 102                 break;
 103         case PRINT_DBG:
 104                 if (lttng_opt_verbose < 1) {
 105                         return false;
 106                 }
 107                 break;
 108         case PRINT_MSG:
 109         case PRINT_WARN:
 110         case PRINT_BUG:
 111         case PRINT_ERR:
 112                 break;
 113         }
 114
 115         return true;
 116 }
 117
 118 void lttng_abort_on_error(void);
 119
 120 static inline void __lttng_print_check_abort(enum lttng_error_level type)
 121 {
 122         switch (type) {
 123         case PRINT_DBG3:
 124         case PRINT_DBG2:
 125         case PRINT_DBG:
 126         case PRINT_MSG:
 127         case PRINT_WARN:
 128                 break;
 129         case PRINT_BUG:
 130         case PRINT_ERR:
 131                 lttng_abort_on_error();
 132         }
 133 }
 134
 135 /*
 136  * Macro for printing message depending on command line option and verbosity.
 137  *
 138  * Machine interface:
 139  * We use lttng_opt_mi to suppress all normal msg to stdout. We don't
 140  * want any nested msg to show up when printing mi to stdout(if it's the case).
 141  * All warnings and errors should be printed to stderr as normal.
 142  */
 143 #define __lttng_print(type, fmt, args...)                                               \
 144         do {                                                                            \
 145                 if (__lttng_print_check_opt(type)) {                                    \
 146                         fprintf((type) == PRINT_MSG ? stdout : stderr, fmt, ## args);   \
 147                 }                                                                       \
 148                 __lttng_print_check_abort(type);                                        \
 149         } while (0)
 150
 151 /* Three level of debug. Use -v, -vv or -vvv for the levels */
 152 #define _ERRMSG(msg, type, fmt, args...) __lttng_print(type, msg \
 153                 " - %s [%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" XSTR(__LINE__) ")\n", \
 154                         log_add_time(), (long) getpid(), (long) gettid(), ## args, __func__)
 155
 156 #define MSG(fmt, args...) \
 157         __lttng_print(PRINT_MSG, fmt "\n", ## args)
 158 #define _MSG(fmt, args...) \
 159         __lttng_print(PRINT_MSG, fmt, ## args)
 160 #define ERR(fmt, args...) \
 161         __lttng_print(PRINT_ERR, "Error: " fmt "\n", ## args)
 162 #define WARN(fmt, args...) \
 163         __lttng_print(PRINT_WARN, "Warning: " fmt "\n", ## args)
 164
 165 #define BUG(fmt, args...) _ERRMSG("BUG", PRINT_BUG, fmt, ## args)
 166
 167 #define DBG(fmt, args...) _ERRMSG("DEBUG1", PRINT_DBG, fmt, ## args)
 168 #define DBG2(fmt, args...) _ERRMSG("DEBUG2", PRINT_DBG2, fmt, ## args)
 169 #define DBG3(fmt, args...) _ERRMSG("DEBUG3", PRINT_DBG3, fmt, ## args)
 170 #define LOG(type, fmt, args...)                 \
 171         do {                                    \
 172                 switch (type) {                 \
 173                 case PRINT_ERR:                 \
 174                         ERR(fmt, ## args);      \
 175                         break;                  \
 176                 case PRINT_WARN:                \
 177                         WARN(fmt, ## args);     \
 178                         break;                  \
 179                 case PRINT_BUG:                 \
 180                         BUG(fmt, ## args);      \
 181                         break;                  \
 182                 case PRINT_MSG:                 \
 183                         MSG(fmt, ## args);      \
 184                         break;                  \
 185                 case PRINT_DBG:                 \
 186                         DBG(fmt, ## args);      \
 187                         break;                  \
 188                 case PRINT_DBG2:                \
 189                         DBG2(fmt, ## args);     \
 190                         break;                  \
 191                 case PRINT_DBG3:                \
 192                         DBG3(fmt, ## args);     \
 193                         break;                  \
 194                 default:                        \
 195                         assert(0);              \
 196                 }                               \
 197         } while(0);
 198
 199 #define _PERROR(fmt, args...) _ERRMSG("PERROR", PRINT_ERR, fmt, ## args)
 200
 201 #if !defined(__GLIBC__) || ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE))
 202
 203 /*
 204  * Version using XSI strerror_r.
 205  */
 206 #define PERROR(call, args...) \
 207         do { \
 208                 char buf[200]; \
 209                 strerror_r(errno, buf, sizeof(buf)); \
 210                 _PERROR(call ": %s", ## args, buf); \
 211         } while(0);
 212 #else
 213 /*
 214  * Version using GNU strerror_r, for linux with appropriate defines.
 215  */
 216 #define PERROR(call, args...) \
 217         do { \
 218                 char *buf; \
 219                 char tmp[200]; \
 220                 buf = strerror_r(errno, tmp, sizeof(tmp)); \
 221                 _PERROR(call ": %s", ## args, buf); \
 222         } while(0);
 223 #endif
 224
 225 const char *error_get_str(int32_t code);
 226
 227 /*
 228  * Function that format the time and return the reference of log_time.str to
 229  * the caller. On error, an empty string is returned thus no time will be
 230  * printed in the log.
 231  */
 232 const char *log_add_time();
 233
 234 #endif /* _ERROR_H */