SIGRTMIN
#define IPI_SIGNAL SIGRTMIN
#if SIGRTMIN > BITS_PER_LONG
((sig) > 0 && (sig) < SIGRTMIN && (rt_sigmask(sig) & (mask)))
return (sig < SIGRTMIN) && sigismember(&signals->signal, sig);
if (sig < SIGRTMIN)
sig >= SIGRTMIN && info->si_code != SI_USER) {
else if (sig >= SIGRTMIN)
return sig - SIGRTMIN + SIGRT_BASE;
for (int sig = SIGRTMIN; sig <= SIGRTMAX; sig++)
sigaction(SIGRTMIN + 1, &act, NULL);
fcntl(fd, F_SETSIG, SIGRTMIN + 1);
sigaddset(&blockmask, SIGRTMIN);
sys_rt_sigqueueinfo(child, SIGRTMIN, &siginfo);
sys_rt_tgsigqueueinfo(child, child, SIGRTMIN, &siginfo);