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