#include <u.h>#define NOPLAN9DEFINES#include <libc.h> char*p9getenv(char *s){	char *t; 	t = getenv(s);	if(t == 0)		return 0;	return strdup(t);} intp9putenv(char *s, char *v){	char *t; 	t = smprint("%s=%s", s, v);	if(t == nil)		return -1;	putenv(t);	return 0;}