#include <u.h>#include <libc.h> intputenv(char *name, char *val){	char ename[100];	int f, n; 	if(name[0]=='\0' || strcmp(name, ".")==0 || strcmp(name, "..")==0 || strchr(name, '/')!=nil	|| strlen(name) >= sizeof(ename)-5){		werrstr("bad env name: %s", name);		return -1;	}	snprint(ename, sizeof(ename), "/env/%s", name);	f = create(ename, OWRITE|OCEXEC, 0664);	if(f < 0)		return -1;	n = strlen(val);	if(write(f, val, n) != n){		close(f);		return -1;	}	close(f);	return 0;}