user_t
adduser(char *login_name, user_t *up)
user_t user;
moduser(char *login_name, char *newlogin, user_t *up, int allow_samba)
user_t *up = &def.user;
user_t *up = &def.user;
user_t *up = &def.user;
setdefaults(user_t *up)
user_t *up = &dp->user;