memcheck/tests/err_disable2.c

   1
   2 /* Test that we get a complaint if a thread exits with error reporting
   3    disabled.  */
   4
   5 #include <stdlib.h>
   6 #include <stdio.h>
   7
   8 #include "../include/valgrind.h"
   9
  10 char* block = NULL;
  11
  12 __attribute__((noinline)) void usechar ( char c )
  13 {
  14    // Spook gcc into believing mysterious bad things are
  15    // happening behind its back, and that 'c' is definitely
  16    // used in some (unknown) way.
  17    __asm__ __volatile__("" : : "r"(c) : "memory","cc");
  18 }
  19
  20 __attribute__((noinline)) void err ( void )
  21 {
  22    usechar( block[5] );
  23 }
  24
  25 int main ( void )
  26 {
  27   block = malloc(10);
  28   free(block);
  29
  30   fprintf(stderr, "\n--------- enabled (expect 1) ---------\n\n");
  31
  32   err();
  33
  34   fprintf(stderr, "\n--------- disabled (expect 0) ---------\n\n");
  35   VALGRIND_DISABLE_ERROR_REPORTING;
  36
  37   err();
  38
  39   fprintf(stderr, "\n--------- exiting (expect complaint) ---------\n\n");
  40
  41   return 0;
  42 }