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/* Test of correct simulation for uc->uc_link in a signal handler. */
#include <assert.h>
#include <signal.h>
#include <stdio.h>
#include <ucontext.h>
static void sighandler(int sig, siginfo_t *sip, void *arg)
{
ucontext_t uc2;
/* Current uc_link value has to be equal to (ucontext_t *) arg. */
getcontext(&uc2);
assert(uc2.uc_link == arg);
}
int main(void)
{
ucontext_t uc;
struct sigaction sa;
/* Current uc_link value has to be NULL. */
if (getcontext(&uc)) {
perror("getcontext");
return 1;
}
assert(!uc.uc_link);
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(SIGUSR1);
/* Current uc_link value has to be NULL. */
getcontext(&uc);
assert(!uc.uc_link);
return 0;
}
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