#include <u.h>#include <libc.h> char*getenv(char *name){	char *ans;	int f;	char ename[200];	long s; 	sprint(ename, "/env/%s", name);	f = open(ename, OREAD);	if(f < 0)		return 0;	s = seek(f, 0, 2);	ans = malloc(s+1);	if(ans) {		seek(f, 0, 0);		read(f, ans, s);		ans[s] = 0;	}	close(f);	return ans;}