/*  * 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> Waitmsg*system(char *name, char **argv){	char err[ERRMAX];	Waitmsg *w;	int pid; 	switch(pid = fork()){	/* assign = */	case -1:		return nil;	case 0:		exec(name, argv);		errstr(err, sizeof err);		_exits(err);	}	for(;;){		w = wait();		if(w == nil)			break;		if(w->pid == pid)			return w;		free(w);	}	return nil;} Waitmsg*systeml(char *name, ...){	return system(name, &name+1);}