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 "lttng/ust-tid.h"
  31 #include "share.h"
  32
  33 enum ust_loglevel {
  34         UST_LOGLEVEL_UNKNOWN = 0,
  35         UST_LOGLEVEL_NORMAL,
  36         UST_LOGLEVEL_DEBUG,
  37 };
  38
  39 extern volatile enum ust_loglevel ust_loglevel;
  40 void init_usterr(void);
  41
  42 static inline int ust_debug(void)
  43 {
  44         return ust_loglevel == UST_LOGLEVEL_DEBUG;
  45 }
  46
  47 #ifndef UST_COMPONENT
  48 #define UST_COMPONENT libust
  49 #endif
  50
  51 /* To stringify the expansion of a define */
  52 #define XSTR(d) STR(d)
  53 #define STR(s) #s
  54
  55 #define UST_STR_COMPONENT XSTR(UST_COMPONENT)
  56
  57 #define ERRMSG(fmt, args...)                                    \
  58         do {                                                    \
  59                 fprintf(stderr, UST_STR_COMPONENT "[%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" XSTR(__LINE__) ")\n",                          \
  60                         (long) getpid(),                        \
  61                         (long) gettid(),                        \
  62                         ## args,                                \
  63                         __func__);                              \
  64         } while(0)
  65
  66 #ifdef LTTNG_UST_DEBUG
  67 # define DBG(fmt, args...)              ERRMSG(fmt, ## args)
  68 # define DBG_raw(fmt, args...)                                  \
  69         do {                                                    \
  70                  fprintf(stderr, fmt, ## args);                 \
  71         } while(0)
  72 #else
  73 # define DBG(fmt, args...)                                      \
  74         do {                                                    \
  75                 if (ust_debug())                                \
  76                         ERRMSG(fmt, ## args);                   \
  77         } while (0)
  78 # define DBG_raw(fmt, args...)                                  \
  79         do {                                                    \
  80                 if (ust_debug()) {                              \
  81                         fprintf(stderr, fmt, ## args);          \
  82                 }                                               \
  83         } while(0)
  84 #endif
  85
  86 #define WARN(fmt, args...) ERRMSG("Warning: " fmt, ## args)
  87 #define ERR(fmt, args...) ERRMSG("Error: " fmt, ## args)
  88 #define BUG(fmt, args...) ERRMSG("BUG: " fmt, ## args)
  89
  90 #if !defined(__linux__) || ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE))
  91 /*
  92  * Version using XSI strerror_r.
  93  */
  94 #define PERROR(call, args...)\
  95         do { \
  96                 char buf[200] = "Error in strerror_r()"; \
  97                 strerror_r(errno, buf, sizeof(buf)); \
  98                 ERRMSG("Error: " call ": %s", ## args, buf); \
  99         } while(0);
 100 #else
 101 /*
 102  * Version using GNU strerror_r, for linux with appropriate defines.
 103  */
 104 #define PERROR(call, args...)\
 105         do { \
 106                 char *buf; \
 107                 char tmp[200]; \
 108                 buf = strerror_r(errno, tmp, sizeof(tmp)); \
 109                 ERRMSG("Error: " call ": %s", ## args, buf); \
 110         } while(0);
 111 #endif
 112
 113 #define BUG_ON(condition)                                       \
 114         do {                                                    \
 115                 if (caa_unlikely(condition))                    \
 116                         ERR("condition not respected (BUG) on line %s:%d", __FILE__, __LINE__); \
 117         } while(0)
 118 #define WARN_ON(condition)                                      \
 119         do {                                                    \
 120                 if (caa_unlikely(condition))                    \
 121                         WARN("condition not respected on line %s:%d", __FILE__, __LINE__); \
 122         } while(0)
 123 #define WARN_ON_ONCE(condition) WARN_ON(condition)
 124
 125 #endif /* _USTERR_H */