#include <u.h>#include <libc.h> char	output[4096];void	add(char*, ...);void	error(char*);void	notifyf(void*, char*); voidmain(int argc, char *argv[]){	int i;	Waitmsg w;	long l;	char *p;	char err[ERRLEN]; 	if(argc <= 1){		fprint(2, "usage: time command\n");		exits("usage");	} 	switch(fork()){	case -1:		error("fork");	case 0:		exec(argv[1], &argv[1]);		if(argv[1][0] != '/' && strncmp(argv[1], "./", 2) &&		   strncmp(argv[1], "../", 3)){			sprint(output, "/bin/%s", argv[1]);			exec(output, &argv[1]);		}		error(argv[1]);	} 	notify(notifyf);     loop:	i = wait(&w);	if(i == -1){		errstr(err);		if(strcmp(err, "interrupted") == 0)			goto loop;		error("wait");	}	l = atoi(&w.time[0*12]);	add("%ld.%.2ldu", l/1000, (l%1000)/10);	l = atoi(&w.time[1*12]);	add("%ld.%.2lds", l/1000, (l%1000)/10);	l = atoi(&w.time[2*12]);	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);	exits(w.msg);} voidadd(char *a, ...){	static beenhere=0; 	if(beenhere)		strcat(output, " ");	doprint(output+strlen(output), output+sizeof(output), a, (&a)+1);	beenhere++;} voiderror(char *s){	char buf[ERRLEN]; 	errstr(buf);	fprint(2, "time: %s: %s\n", s, buf);	exits(s);} voidnotifyf(void *a, char *s){	USED(a);	if(strcmp(s, "interrupt") == 0)		noted(NCONT);	noted(NDFLT);}