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/* Test that the stack correctly dies after a setcontext(2) call. */
#include <assert.h>
#include <signal.h>
#include <stdio.h>
#include <ucontext.h>
static volatile int *sp;
static void sighandler(int sig, siginfo_t *sip, void *arg)
{
ucontext_t *ucp = (ucontext_t *) arg;
sp = (int *) &ucp->uc_mcontext.gregs[0];
}
int main(void)
{
struct sigaction sa;
/* Always-null value that is used to prevent any possible compiler
optimizations. */
volatile int zero = 0;
/* Setup a signal handler. */
sa.sa_sigaction = sighandler;
sa.sa_flags = SA_SIGINFO;
if (sigfillset(&sa.sa_mask)) {
perror("sigfillset");
return 1;
}
if (sigaction(SIGUSR1, &sa, NULL)) {
perror("sigaction");
return 1;
}
/* Raise a signal. */
raise(SIGUSR1);
/* Value pointed by sp should be at this point uninitialized. */
if (*sp && zero)
assert(0);
return 0;
}
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