82 static pid_t	 of_pid;	/* process id of output filter, if any */  variable
288 			if (of_pid > 0) {  in printjob()
289 				kill(of_pid, SIGCONT); /* to be sure */  in printjob()
291 				while ((i = wait(NULL)) > 0 && i != of_pid)  in printjob()
295 					    pp->printer, of_pid);  in printjob()
296 				of_pid = 0;  in printjob()
769 	if (of_pid > 0) {		/* stop output filter */  in print()
772 		    wait3(&wstatus, WUNTRACED, 0)) > 0 && wpid != of_pid)  in print()
782 			    pp->printer, of_pid, WEXITSTATUS(wstatus),  in print()
824 		if (kill(of_pid, SIGCONT) < 0) {  in print()
1578 	if (of_pid > 0)  in abortpr()
1579 		kill(of_pid, SIGCONT);  in abortpr()
1582 	if (of_pid > 0 && tfd != -1)  in abortpr()
1645 		of_pid = 0;  in openpr()
1661 	if (pp->filters[LPF_OUTPUT] && !pp->filters[LPF_INPUT] && !of_pid) {  in openpr()
1667 		if ((of_pid = dofork(pp, DOABORT)) == 0) {	/* child */  in openpr()
1687 		of_pid = 0;  in openpr()