semun
union semun semun = { 0 };
union semun *semun_ptr = NULL;
semun = va_arg(ap, union semun);
semun_ptr = &semun;
extern int __sys___semctl(int, int, int, union semun *);
sysvipc___semctl(int semid, int semnum, int cmd, union semun *arg)
int sysvipc___semctl(int, int, int, union semun *);
union semun *arg = uap->arg;
union semun real_arg;
union semun * arg; char arg_[PAD_(union semun *)];
union semun sun;
union semun sun;