siginterrupt
int siginterrupt(int, int);
siginterrupt(SIGALRM, 1);
siginterrupt(SIGTERM, 1);
siginterrupt(SIGHUP, 1);
ASSERT_EQ(0, siginterrupt(SIGUSR2, 1));
(void)siginterrupt(SIGINFO, 1);
siginterrupt(SIGHUP, 1);
siginterrupt(SIGTERM, 1);