1 #include <unistd.h>

     2 

     3 #define STRINGIFY(x) #x

     4 #define TOSTRING(x) STRINGIFY(x)

     5 

     6 #define CURRENT_LOCATION __FILE__ ":" TOSTRING(__LINE__)

     7 

     8 #define err()                         \

     9 {                                     \

    10   _fail("at " CURRENT_LOCATION " ");  \

    11 }

    12 

    13 #define mb() asm volatile ("" : : : "memory")

    14 

    15 extern void pass(void);

    16 extern void _fail(char *reason);