memcheck/tests/badjump2.c

   1 #include <assert.h>
   2 #include <setjmp.h>
   3 #include <signal.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6
   7 // Regression test for bug 91162:  if a client had a SEGV signal handler,
   8 // and jumped to a bogus address, Valgrind would abort.  With the fix,
   9 // the following test runs to completion correctly.
  10
  11 static jmp_buf myjmpbuf;
  12
  13 static
  14 void SIGSEGV_handler(int signum)
  15 {
  16    longjmp(myjmpbuf, 1);
  17 }
  18
  19 int main(void)
  20 {
  21    struct sigaction sigsegv_new, sigsegv_saved;
  22    int res;
  23
  24    /* Install own SIGSEGV handler */
  25    sigsegv_new.sa_handler  = SIGSEGV_handler;
  26    sigsegv_new.sa_flags    = 0;
  27 #if !defined(__APPLE__) && !defined(__sun)
  28    sigsegv_new.sa_restorer = NULL;
  29 #endif
  30    res = sigemptyset( &sigsegv_new.sa_mask );
  31    assert(res == 0);
  32
  33    res = sigaction( SIGSEGV, &sigsegv_new, &sigsegv_saved );
  34    assert(res == 0);
  35
  36    if (setjmp(myjmpbuf) == 0) {
  37       // Jump to zero; will cause seg fault
  38 #if defined(__powerpc64__) && (_CALL_ELF != 2)
  39       unsigned long int fn[3];
  40       fn[0] = 0;
  41       fn[1] = 0;
  42       fn[2] = 0;
  43 #else
  44       void (*fn)(void) = 0;
  45 #endif
  46       ((void(*)(void)) fn) ();
  47       fprintf(stderr, "Got here??\n");
  48    } else  {
  49       fprintf(stderr, "Signal caught, as expected\n");
  50    }
  51
  52    return 0;
  53 }
  54