include/usterr.h

   1 #ifndef _USTERR_H
   2 #define _USTERR_H
   3
   4 /*
   5  * Copyright (C) 2009  Pierre-Marc Fournier
   6  * Copyright (C) 2011  Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; version 2.1 of
  11  * the License.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  21  */
  22
  23 #include <string.h>
  24 #include <sys/types.h>
  25 #include <sys/syscall.h>
  26 #include <errno.h>
  27 #include <stdarg.h>
  28 #include <stdio.h>
  29
  30 #include "share.h"
  31
  32 enum ust_loglevel {
  33         UST_LOGLEVEL_UNKNOWN = 0,
  34         UST_LOGLEVEL_NORMAL,
  35         UST_LOGLEVEL_DEBUG,
  36 };
  37
  38 extern volatile enum ust_loglevel ust_loglevel;
  39 void init_usterr(void);
  40
  41 static inline int ust_debug(void)
  42 {
  43         return ust_loglevel == UST_LOGLEVEL_DEBUG;
  44 }
  45
  46 #ifndef UST_COMPONENT
  47 #define UST_COMPONENT libust
  48 #endif
  49
  50 /* To stringify the expansion of a define */
  51 #define XSTR(d) STR(d)
  52 #define STR(s) #s
  53
  54 #define UST_STR_COMPONENT XSTR(UST_COMPONENT)
  55
  56 #define ERRMSG(fmt, args...)                                    \
  57         do {                                                    \
  58                 fprintf(stderr, UST_STR_COMPONENT "[%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" XSTR(__LINE__) ")\n",                          \
  59                         (long) getpid(),                        \
  60                         (long) syscall(SYS_gettid),             \
  61                         ## args,                                \
  62                         __func__);                              \
  63         } while(0)
  64
  65 #ifdef LTTNG_UST_DEBUG
  66 # define DBG(fmt, args...)              ERRMSG(fmt, ## args)
  67 # define DBG_raw(fmt, args...)                                  \
  68         do {                                                    \
  69                  fprintf(stderr, fmt, ## args);                 \
  70         } while(0)
  71 #else
  72 # define DBG(fmt, args...)                                      \
  73         do {                                                    \
  74                 if (ust_debug())                                \
  75                         ERRMSG(fmt, ## args);                   \
  76         } while (0)
  77 # define DBG_raw(fmt, args...)                                  \
  78         do {                                                    \
  79                 if (ust_debug()) {                              \
  80                         fprintf(stderr, fmt, ## args);          \
  81                 }                                               \
  82         } while(0)
  83 #endif
  84
  85 #define WARN(fmt, args...) ERRMSG("Warning: " fmt, ## args)
  86 #define ERR(fmt, args...) ERRMSG("Error: " fmt, ## args)
  87 #define BUG(fmt, args...) ERRMSG("BUG: " fmt, ## args)
  88
  89 #if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE)
  90 #define PERROR(call, args...)\
  91         do { \
  92                 char buf[200] = "Error in strerror_r()"; \
  93                 strerror_r(errno, buf, sizeof(buf)); \
  94                 ERRMSG("Error: " call ": %s", ## args, buf); \
  95         } while(0);
  96 #else
  97 #define PERROR(call, args...)\
  98         do { \
  99                 char *buf; \
 100                 char tmp[200]; \
 101                 buf = strerror_r(errno, tmp, sizeof(tmp)); \
 102                 ERRMSG("Error: " call ": %s", ## args, buf); \
 103         } while(0);
 104 #endif
 105
 106 #define BUG_ON(condition)                                       \
 107         do {                                                    \
 108                 if (caa_unlikely(condition))                    \
 109                         ERR("condition not respected (BUG) on line %s:%d", __FILE__, __LINE__); \
 110         } while(0)
 111 #define WARN_ON(condition)                                      \
 112         do {                                                    \
 113                 if (caa_unlikely(condition))                    \
 114                         WARN("condition not respected on line %s:%d", __FILE__, __LINE__); \
 115         } while(0)
 116 #define WARN_ON_ONCE(condition) WARN_ON(condition)
 117
 118 #endif /* _USTERR_H */