/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h> int alarmed;int done; voidusage(void){	fprint(2, "usage: %s [-q]\n", argv0);	exits("usage");} voidding(void*, char *s){	if(strstr(s, "alarm")){		alarmed = 1;		noted(NCONT);	} else		noted(NDFLT);}  voidmain(int argc, char **argv){	int fd, cfd;	int i;	char buf[1];	int quiet = 0; 	ARGBEGIN {	case 'q':		quiet = 1;		break;	} ARGEND; 	notify(ding); 	fd = open("/dev/cons", ORDWR);	if(fd < 0)		sysfatal("opening /dev/cons: %r");	cfd = open("/dev/consctl", OWRITE);	if(cfd >= 0)		fprint(cfd, "rawon"); 	switch(rfork(RFPROC|RFFDG|RFMEM)){	case -1:		sysfatal("forking: %r");	default:		// read until we're done writing or		// we get an end of line		while(!done){			alarmed = 0;			alarm(250);			i = read(0, buf, 1);			alarm(0); 			if(i == 0)				break;			if(i < 0){				if(alarmed)					continue;				else					break;			}			if(!quiet && write(fd, buf, 1) < 1)				break;			if(buf[0] == '\n' || buf[0] == '\r')				break;		}			break;	case 0:		// pass one character at a time till end of line		for(;;){			if(read(fd, buf, 1) <= 0)				break;			if(write(1, buf, 1) < 0)				break;			if(buf[0] == '\n' || buf[0] == '\r')				break;		} 		// tell reader to give up after next char		done = 1;		break;	}	exits(0);}