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 #define sigsafe_print_err(fmt, args...) \
  27 { \
  28         /* Can't use dynamic allocation. Limit ourselves to 250 chars. */ \
  29         char ____buf[250]; \
  30         int ____saved_errno; \
  31 \
  32         /* Save the errno. */ \
  33         ____saved_errno = errno; \
  34 \
  35         snprintf(____buf, sizeof(____buf), fmt, ## args); \
  36 \
  37         /* Add end of string in case of buffer overflow. */ \
  38         ____buf[sizeof(____buf)-1] = 0; \
  39 \
  40         patient_write(STDERR_FILENO, ____buf, strlen(____buf)); \
  41         /* Can't print errors because we are in the error printing code path. */ \
  42 \
  43         /* Restore errno, in order to be async-signal safe. */ \
  44         errno = ____saved_errno; \
  45 }
  46
  47 #define UST_STR_COMPONENT XSTR(UST_COMPONENT)
  48
  49 #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)
  50
  51 #ifdef UST_DEBUG
  52 # define DBG(fmt, args...) ERRMSG(fmt, ## args)
  53 # define DBG_raw(fmt, args...) do { sigsafe_print_err(fmt, ## args); fflush(stderr); } while(0)
  54 #else
  55 # define DBG(fmt, args...) do {} while(0)
  56 # define DBG_raw(fmt, args...) do {} while(0)
  57 #endif
  58 #define WARN(fmt, args...) ERRMSG("Warning: " fmt, ## args)
  59 #define ERR(fmt, args...) ERRMSG("Error: " fmt, ## args)
  60 #define BUG(fmt, args...) ERRMSG("BUG: " fmt, ## args)
  61
  62 #if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE)
  63 #define PERROR(call, args...)\
  64         do { \
  65                 char buf[200] = "Error in strerror_r()"; \
  66                 strerror_r(errno, buf, sizeof(buf)); \
  67                 ERRMSG("Error: " call ": %s", ## args, buf); \
  68         } while(0);
  69 #else
  70 #define PERROR(call, args...)\
  71         do { \
  72                 char *buf; \
  73                 char tmp[200]; \
  74                 buf = strerror_r(errno, tmp, sizeof(tmp)); \
  75                 ERRMSG("Error: " call ": %s", ## args, buf); \
  76         } while(0);
  77 #endif
  78
  79 #define BUG_ON(condition) do { if (unlikely(condition)) ERR("condition not respected (BUG)"); } while(0)
  80 #define WARN_ON(condition) do { if (unlikely(condition)) WARN("condition not respected on line %s:%d", __FILE__, __LINE__); } while(0)
  81
  82 #endif /* USTERR_H */