#include <u.h>#include <libc.h>#include <thread.h> char	output[4096];void	add(char*, ...);void	error(char*);void	notifyf(void*, char*); voidthreadmain(int argc, char *argv[]){	int i;	Channel *cwait;	Waitmsg *w;	vlong t0, t1;	long l;	char *p;	char err[ERRMAX]; 	if(argc <= 1){		fprint(2, "usage: time command\n");		threadexitsall("usage");	} 	t0 = nsec();	cwait = threadwaitchan();	if(threadspawn((int[3]){dup(0, -1), dup(1, -1), dup(2, -1)}, argv[1], &argv[1])==-1)		error("spawn"); 	notify(notifyf);     loop:	w = recvp(cwait);	t1 = nsec();	if(w == nil){		rerrstr(err, sizeof err);		if(strcmp(err, "interrupted") == 0)			goto loop;		error("wait");	}	l = w->time[0];	add("%ld.%.2ldu", l/1000, (l%1000)/10);	l = w->time[1];	add("%ld.%.2lds", l/1000, (l%1000)/10);	l = (t1-t0)/1000000;	add("%ld.%.2ldr", l/1000, (l%1000)/10);	add("\t");	for(i=1; i<argc; i++){		add("%s", argv[i], 0);		if(i>4){			add("...");			break;		}	}	if(w->msg[0]){		p = utfrune(w->msg, ':');		if(p && p[1])			p++;		else			p = w->msg;		add(" # status=%s", p);	}	fprint(2, "%s\n", output);	threadexitsall(w->msg);} voidadd(char *a, ...){	static int beenhere=0;	va_list arg; 	if(beenhere)		strcat(output, " ");	va_start(arg, a);	vseprint(output+strlen(output), output+sizeof(output), a, arg);	va_end(arg);	beenhere++;} voiderror(char *s){ 	fprint(2, "time: %s: %r\n", s);	threadexitsall(s);} voidnotifyf(void *a, char *s){	USED(a);	if(strcmp(s, "interrupt") == 0)		noted(NCONT);	noted(NDFLT);}