ID0realuid
setuid(ID0realuid());
setuid(ID0realuid());
setuid(ID0realuid());
setuid(ID0realuid());
setuid(ID0realuid());
extern uid_t ID0realuid(void);
if (ID0realuid() != 0) {
pwd = getpwuid(ID0realuid());
pwd = getpwuid(ID0realuid());
how = ID0realuid() == 0 ? SYSTEM_EXISTS : SYSTEM_VALIDATE;