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 <urcu/tls-compat.h>
  26 #include <time.h>
  27
  28 #ifndef _GNU_SOURCE
  29 #error "lttng-tools error.h needs _GNU_SOURCE"
  30 #endif
  31
  32 #include <lttng/lttng-error.h>
  33 #include <common/compat/tid.h>
  34
  35 /* Stringify the expansion of a define */
  36 #define XSTR(d) STR(d)
  37 #define STR(s) #s
  38
  39 /*
  40  * Contains the string of the log entry time. This is used as a thread local
  41  * storage so we don't race between thread and also avoid memory allocation
  42  * every time a log is fired.
  43  */
  44 struct log_time {
  45         /* Format: 00:00:00.000000 plus NULL byte. */
  46         char str[16];
  47 };
  48 extern DECLARE_URCU_TLS(struct log_time, error_log_time);
  49
  50 extern int lttng_opt_quiet;
  51 extern int lttng_opt_verbose;
  52 extern int lttng_opt_mi;
  53
  54 /* Error type. */
  55 #define PRINT_ERR   0x1
  56 #define PRINT_WARN  0x2
  57 #define PRINT_BUG   0x3
  58 #define PRINT_MSG   0x4
  59 #define PRINT_DBG   0x10
  60 #define PRINT_DBG2  0x20
  61 #define PRINT_DBG3  0x30
  62
  63 /*
  64  * Macro for printing message depending on command line option and verbosity.
  65  *
  66  * Machine interface:
  67  * We use lttng_opt_mi to suppress all normal msg to stdout. We don't
  68  * want any nested msg to show up when printing mi to stdout(if it's the case).
  69  * All warnings and errors should be printed to stderr as normal.
  70  */
  71 #define __lttng_print(type, fmt, args...)                           \
  72         do {                                                            \
  73                 if (lttng_opt_quiet == 0 && lttng_opt_mi == 0 &&            \
  74                                 type == PRINT_MSG) {                                \
  75                         fprintf(stdout, fmt, ## args);                          \
  76                 } else if (lttng_opt_quiet == 0 && lttng_opt_mi == 0 &&     \
  77                                 (((type & PRINT_DBG) && lttng_opt_verbose == 1) ||  \
  78                                 ((type & (PRINT_DBG | PRINT_DBG2)) &&               \
  79                                         lttng_opt_verbose == 2) ||                      \
  80                                 ((type & (PRINT_DBG | PRINT_DBG2 | PRINT_DBG3)) &&  \
  81                                         lttng_opt_verbose == 3))) {                     \
  82                         fprintf(stderr, fmt, ## args);                          \
  83                 } else if (lttng_opt_quiet == 0 &&                          \
  84                                 (type & (PRINT_WARN | PRINT_ERR | PRINT_BUG))) {    \
  85                         fprintf(stderr, fmt, ## args);                          \
  86                 }                                                           \
  87         } while (0);
  88
  89 /* Three level of debug. Use -v, -vv or -vvv for the levels */
  90 #define _ERRMSG(msg, type, fmt, args...) __lttng_print(type, msg \
  91                 " - %s [%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" XSTR(__LINE__) ")\n", \
  92                         log_add_time(), (long) getpid(), (long) gettid(), ## args, __func__)
  93
  94 #define MSG(fmt, args...) \
  95         __lttng_print(PRINT_MSG, fmt "\n", ## args)
  96 #define _MSG(fmt, args...) \
  97         __lttng_print(PRINT_MSG, fmt, ## args)
  98 #define ERR(fmt, args...) \
  99         __lttng_print(PRINT_ERR, "Error: " fmt "\n", ## args)
 100 #define WARN(fmt, args...) \
 101         __lttng_print(PRINT_ERR, "Warning: " fmt "\n", ## args)
 102
 103 #define BUG(fmt, args...) _ERRMSG("BUG", PRINT_BUG, fmt, ## args)
 104
 105 #define DBG(fmt, args...) _ERRMSG("DEBUG1", PRINT_DBG, fmt, ## args)
 106 #define DBG2(fmt, args...) _ERRMSG("DEBUG2", PRINT_DBG2, fmt, ## args)
 107 #define DBG3(fmt, args...) _ERRMSG("DEBUG3", PRINT_DBG3, fmt, ## args)
 108
 109 #define _PERROR(fmt, args...) _ERRMSG("PERROR", PRINT_ERR, fmt, ## args)
 110
 111 #if !defined(__linux__) || ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE))
 112
 113 /*
 114  * Version using XSI strerror_r.
 115  */
 116 #define PERROR(call, args...) \
 117         do { \
 118                 char buf[200]; \
 119                 strerror_r(errno, buf, sizeof(buf)); \
 120                 _PERROR(call ": %s", ## args, buf); \
 121         } while(0);
 122 #else
 123 /*
 124  * Version using GNU strerror_r, for linux with appropriate defines.
 125  */
 126 #define PERROR(call, args...) \
 127         do { \
 128                 char *buf; \
 129                 char tmp[200]; \
 130                 buf = strerror_r(errno, tmp, sizeof(tmp)); \
 131                 _PERROR(call ": %s", ## args, buf); \
 132         } while(0);
 133 #endif
 134
 135 const char *error_get_str(int32_t code);
 136
 137 /*
 138  * Function that format the time and return the reference of log_time.str to
 139  * the caller. On error, an empty string is returned thus no time will be
 140  * printed in the log.
 141  */
 142 const char *log_add_time();
 143
 144 #endif /* _ERROR_H */