include/usterr.h

   1 #ifndef USTERR_H
   2 #define USTERR_H
   3
   4 #include <string.h>
   5 #include <sys/types.h>
   6 #include <sys/syscall.h>
   7 #include <errno.h>
   8 #include <stdarg.h>
   9 #include <stdio.h>
  10
  11 #include "share.h"
  12
  13 #ifndef UST_COMPONENT
  14 //#error UST_COMPONENT is undefined
  15 #define UST_COMPONENT libust
  16 #endif
  17
  18 /* To stringify the expansion of a define */
  19 #define XSTR(d) STR(d)
  20 #define STR(s) #s
  21
  22 /* We sometimes print in the tracing path, and tracing can occur in
  23  * signal handlers, so we must use a print method which is signal safe.
  24  */
  25
  26 extern int ust_safe_snprintf(char *str, size_t n, const char *fmt, ...);
  27
  28 #define sigsafe_print_err(fmt, args...) \
  29 { \
  30         /* Can't use dynamic allocation. Limit ourselves to 250 chars. */ \
  31         char ____buf[250]; \
  32         int ____saved_errno; \
  33 \
  34         /* Save the errno. */ \
  35         ____saved_errno = errno; \
  36 \
  37         ust_safe_snprintf(____buf, sizeof(____buf), fmt, ## args); \
  38 \
  39         /* Add end of string in case of buffer overflow. */ \
  40         ____buf[sizeof(____buf)-1] = 0; \
  41 \
  42         patient_write(STDERR_FILENO, ____buf, strlen(____buf)); \
  43         /* Can't print errors because we are in the error printing code path. */ \
  44 \
  45         /* Restore errno, in order to be async-signal safe. */ \
  46         errno = ____saved_errno; \
  47 }
  48
  49 #define UST_STR_COMPONENT XSTR(UST_COMPONENT)
  50
  51 #define ERRMSG(fmt, args...) do { sigsafe_print_err(UST_STR_COMPONENT "[%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" XSTR(__LINE__) ")\n", (long) getpid(), (long) syscall(SYS_gettid), ## args, __func__); fflush(stderr); } while(0)
  52
  53 #ifdef UST_DEBUG
  54 # define DBG(fmt, args...) ERRMSG(fmt, ## args)
  55 # define DBG_raw(fmt, args...) do { sigsafe_print_err(fmt, ## args); fflush(stderr); } while(0)
  56 #else
  57 # define DBG(fmt, args...) do {} while(0)
  58 # define DBG_raw(fmt, args...) do {} while(0)
  59 #endif
  60 #define WARN(fmt, args...) ERRMSG("Warning: " fmt, ## args)
  61 #define ERR(fmt, args...) ERRMSG("Error: " fmt, ## args)
  62 #define BUG(fmt, args...) ERRMSG("BUG: " fmt, ## args)
  63
  64 #if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE)
  65 #define PERROR(call, args...)\
  66         do { \
  67                 char buf[200] = "Error in strerror_r()"; \
  68                 strerror_r(errno, buf, sizeof(buf)); \
  69                 ERRMSG("Error: " call ": %s", ## args, buf); \
  70         } while(0);
  71 #else
  72 #define PERROR(call, args...)\
  73         do { \
  74                 char *buf; \
  75                 char tmp[200]; \
  76                 buf = strerror_r(errno, tmp, sizeof(tmp)); \
  77                 ERRMSG("Error: " call ": %s", ## args, buf); \
  78         } while(0);
  79 #endif
  80
  81 #define BUG_ON(condition) do { if (unlikely(condition)) ERR("condition not respected (BUG)"); } while(0)
  82 #define WARN_ON(condition) do { if (unlikely(condition)) WARN("condition not respected on line %s:%d", __FILE__, __LINE__); } while(0)
  83
  84 #endif /* USTERR_H */