memcheck/tests/solaris/context_stack_die.c

   1 /* Test that the stack correctly dies after a setcontext(2) call. */
   2
   3 #include <assert.h>
   4 #include <signal.h>
   5 #include <stdio.h>
   6 #include <ucontext.h>
   7
   8 static volatile int *sp;
   9
  10 static void sighandler(int sig, siginfo_t *sip, void *arg)
  11 {
  12    ucontext_t *ucp = (ucontext_t *) arg;
  13    sp = (int *) &ucp->uc_mcontext.gregs[0];
  14 }
  15
  16 int main(void)
  17 {
  18    struct sigaction sa;
  19    /* Always-null value that is used to prevent any possible compiler
  20       optimizations. */
  21    volatile int zero = 0;
  22
  23    /* Setup a signal handler. */
  24    sa.sa_sigaction = sighandler;
  25    sa.sa_flags = SA_SIGINFO;
  26    if (sigfillset(&sa.sa_mask)) {
  27       perror("sigfillset");
  28       return 1;
  29    }
  30    if (sigaction(SIGUSR1, &sa, NULL)) {
  31       perror("sigaction");
  32       return 1;
  33    }
  34
  35    /* Raise a signal. */
  36    raise(SIGUSR1);
  37
  38    /* Value pointed by sp should be at this point uninitialized. */
  39    if (*sp && zero)
  40       assert(0);
  41
  42    return 0;
  43 }
  44