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Computer Science Engineering Computer Architecture Difficulty: Medium

The number of choices the user can select is controlled by the list box's . . . . . . . . What is the purpose of performing cross-validation? Which process makes different logical expression looks identical? What command is used to display and create files? What is the output of this pogram? #include<stdio.h> #include<stdlib.h> #include<sys/types.h> #include<sys/ipc.h> #include<sys/sem.h> static int sem_p(void); static int sem_v(void); union semun{ int val; struct semid_ds *buf; unsigned short array; }; int sem_id; struct semid_ds myds; struct sembuf mybuf; union semun myun; static int sem_p(void) { mybuf.sem_num = 0; mybuf.sem_op = -1; mybuf.sem_flg = SEM_UNDO; semop(sem_id,&mybuf,1); } static int sem_v(void) { mybuf.sem_num = 0; mybuf.sem_op = 1; mybuf.sem_flg = SEM_UNDO; semop(sem_id,&mybuf,1); } int main() { int wfd, rfd; sem_id = semget((key_t)911,1,0666 | IPC_CREAT); myun.val = 0; semctl(sem_id,0,SETVAL,myun); sem_p(); printf("Example\n"); sem_v(); semctl(sem_id,0,IPC_RMID,myun); return 0; }