Function sig_ast_needsigchk

freebsd/kern/kern_sig.c:3168–3214

}

int
sig_ast_needsigchk(struct thread *td)
{
	struct proc *p;
	struct sigacts *ps;
	int ret, sig;

	p = td->td_proc;
	PROC_LOCK_ASSERT(p, MA_OWNED);

	if ((td->td_flags & TDF_NEEDSIGCHK) == 0)
		return (0);

	ps = p->p_sigacts;
	mtx_lock(&ps->ps_mtx);
	sig = cursig(td);
	if (sig == -1) {
		mtx_unlock(&ps->ps_mtx);
		KASSERT((td->td_flags & TDF_SBDRY) != 0, ("lost TDF_SBDRY"));
		KASSERT(TD_SBDRY_INTR(td),
		    ("lost TDF_SERESTART of TDF_SEINTR"));
		KASSERT((td->td_flags & (TDF_SEINTR | TDF_SERESTART)) !=
		    (TDF_SEINTR | TDF_SERESTART),
		    ("both TDF_SEINTR and TDF_SERESTART"));
		ret = TD_SBDRY_ERRNO(td);
	} else if (sig != 0) {
		ret = SIGISMEMBER(ps->ps_sigintr, sig) ? EINTR : ERESTART;
		mtx_unlock(&ps->ps_mtx);
	} else {
		mtx_unlock(&ps->ps_mtx);
		ret = 0;
	}

	/*
	 * Do not go into sleep if this thread was the ptrace(2)
	 * attach leader.  cursig() consumed SIGSTOP from PT_ATTACH,
	 * but we usually act on the signal by interrupting sleep, and
	 * should do that here as well.
	 */
	if ((td->td_dbgflags & TDB_FSTP) != 0) {
		if (ret == 0)
			ret = EINTR;
		td->td_dbgflags &= ~TDB_FSTP;
	}

	return (ret);
}

int
sig_intr(void)