#include <u.h>#include <libc.h>#include <draw.h>#include "cons.h" /* *  create a shared segment.  Make is start 2 meg higher than the current *  end of process memory. */static void*share(int len){	ulong vastart; 	vastart = ((ulong)sbrk(0)) + 2*1024*1024; 	if(segattach(0, "shared", (void *)vastart, len) < 0)		return 0;	memset((void*)vastart, 0, len); 	return (void*)vastart;} /* *  bind a pipe onto consctl and keep reading it to *  get changes to console state. */Consstate*consctl(void){	int i, n;	int fd;	int tries;	char buf[128];	Consstate *x;	char *field[10]; 	x = share(sizeof(Consstate));	if(x == 0)		return 0; 	/* a pipe to simulate consctl */	if(bind("#|", "/mnt/cons/consctl", MBEFORE) < 0	|| bind("/mnt/cons/consctl/data1", "/dev/consctl", MREPL) < 0){		fprint(2, "error simulating consctl\n");		exits("/dev/consctl");	} 	/* a pipe to simulate the /dev/cons */	if(bind("#|", "/mnt/cons/cons", MREPL) < 0	|| bind("/mnt/cons/cons/data1", "/dev/cons", MREPL) < 0){		fprint(2, "error simulating cons\n");		exits("/dev/cons");	} 	switch(fork()){	case -1:		return 0;	case 0:		break;	default:		return x;	} 	notify(0); 	for(tries = 0; tries < 100; tries++){		x->raw = 0;		x->hold = 0;		fd = open("/mnt/cons/consctl/data", OREAD);		if(fd < 0)			break;		tries = 0;		for(;;){			n = read(fd, buf, sizeof(buf)-1);			if(n <= 0)				break;			buf[n] = 0;			n = getfields(buf, field, 10, 1, " ");			for(i = 0; i < n; i++){				if(strcmp(field[i], "rawon") == 0)					x->raw = 1;				else if(strcmp(field[i], "rawoff") == 0)					x->raw = 0;				else if(strcmp(field[i], "holdon") == 0)					x->hold = 1;				else if(strcmp(field[i], "holdoff") == 0)					x->hold = 0;			}		}		close(fd);	}	exits(0);	return 0;		/* dummy to keep compiler quiet*/}