107 sigsys(int sig, sigtype func)  in sigsys()  argument
111 	old = sigdisp(sig);  in sigsys()
112 	signal(sig, func);  in sigsys()
123 sigset(int sig, sigtype func)  in sigset()  argument
127 	if (sig < 1 || sig > NSIG) {  in sigset()
131 	old = sigdisp(sig);  in sigset()
136 		sighold(sig);  in sigset()
139 	sigtable[sig].s_flag |= SSET;  in sigset()
140 	sigtable[sig].s_func = func;  in sigset()
147 		if ((sigtable[sig].s_flag & SHELD) == 0)  in sigset()
148 			signal(sig, SIG_DFL);  in sigset()
150 			signal(sig, _Sigtramp);  in sigset()
157 		signal(sig, SIG_IGN);  in sigset()
158 		sigtable[sig].s_flag &= ~SDEFER;  in sigset()
161 	signal(sig, _Sigtramp);  in sigset()
171 sighold(int sig)  in sighold()  argument
175 	if (sig < 1 || sig > NSIG) {  in sighold()
179 	old = sigdisp(sig);  in sighold()
180 	if (sigtable[sig].s_flag & SHELD)  in sighold()
187 		sigtable[sig].s_flag |= SSET;  in sighold()
188 		signal(sig, _Sigtramp);  in sighold()
190 	sigtable[sig].s_flag |= SHELD;  in sighold()
199 sigrelse(int sig)  in sigrelse()  argument
203 	if (sig < 1 || sig > NSIG) {  in sigrelse()
207 	old = sigdisp(sig);  in sigrelse()
208 	if ((sigtable[sig].s_flag & SHELD) == 0)  in sigrelse()
210 	sigtable[sig].s_flag &= ~SHELD;  in sigrelse()
211 	if (sigtable[sig].s_flag & SDEFER)  in sigrelse()
212 		_Sigtramp(sig);  in sigrelse()
217 	if (sigtable[sig].s_func == SIG_DFL)  in sigrelse()
218 		signal(sig, SIG_DFL);  in sigrelse()
226 sigignore(int sig)  in sigignore()  argument
228 	return(sigset(sig, SIG_IGN));  in sigignore()
239 sigpause(int sig)  in sigpause()  argument
241 	if (sig < 1 || sig > NSIG) {  in sigpause()
245 	sigtable[sig].s_flag |= SHELD|SPAUSE;  in sigpause()
248 	sigtable[sig].s_flag &= ~SPAUSE;  in sigpause()
249 	sigtable[sig].s_flag |= SDEFER;  in sigpause()
274 sigdisp(int sig)  in sigdisp()  argument
278 	if (sig < 1 || sig > NSIG) {  in sigdisp()
286 	if ((sigtable[sig].s_flag & SSET) == 0) {  in sigdisp()
287 		old = signal(sig, SIG_IGN);  in sigdisp()
288 		sigtable[sig].s_func = old;  in sigdisp()
289 		sigtable[sig].s_flag |= SSET;  in sigdisp()
290 		signal(sig, old);  in sigdisp()
298 	return(sigtable[sig].s_func);  in sigdisp()
306 _Sigtramp(int sig)  in _Sigtramp()  argument
310 	if (sig < 1 || sig > NSIG) {  in _Sigtramp()
316 	old = signal(sig, SIG_IGN);  in _Sigtramp()
320 	if (sigtable[sig].s_flag & SPAUSE)  in _Sigtramp()
327 	if (sigtable[sig].s_flag & SHELD) {  in _Sigtramp()
328 		sigtable[sig].s_flag |= SDEFER;  in _Sigtramp()
329 		signal(sig, _Sigtramp);  in _Sigtramp()
337 	if (sigtable[sig].s_func == SIG_IGN)  in _Sigtramp()
344 	if (sigtable[sig].s_func == SIG_DFL) {  in _Sigtramp()
345 		signal(sig, SIG_DFL);  in _Sigtramp()
346 		kill(getpid(), sig);  in _Sigtramp()
359 	sigtable[sig].s_flag &= ~SDEFER;  in _Sigtramp()
360 	sigtable[sig].s_flag |= SHELD;  in _Sigtramp()
361 	signal(sig, _Sigtramp);  in _Sigtramp()
362 	(*sigtable[sig].s_func)(sig);  in _Sigtramp()
367 	sigtable[sig].s_flag &= ~SHELD;  in _Sigtramp()
368 	if (sigtable[sig].s_flag & SDEFER)  in _Sigtramp()