kern_sigaction
error = kern_sigaction(td, uap->sig, sap, &osa, 0);
error = kern_sigaction(td, uap->sig, sap, &osa, KSA_FREEBSD4);
error = kern_sigaction(td, uap->signum, sap, &osa, KSA_OSIGSET);
error = kern_sigaction(td, uap->signum, sap, &osa, KSA_OSIGSET);
error = kern_sigaction(td, sig, nsa, osa, 0);
error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
error = kern_sigaction(td, uap->sig, actp, oactp, 0);
error = kern_sigaction(td, uap->sig, actp, oactp, KSA_FREEBSD4);
int kern_sigaction(struct thread *td, int sig, const struct sigaction *act,