System_Software_HandsOnList2/029.c at main · superv13/System_Software_HandsOnList2 · GitHub

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/*
..........................................................................................................................................
Name : 029.c
Author : SHRUTI VERMA
Description : Write a program to remove the message queue.
Date : 18 Sep 2025
..........................................................................................................................................
*/

#include<unistd.h>
#include<stdlib.h>
#include<stdio.h>
#include<sys/msg.h>
#include<sys/ipc.h>
#include<sys/wait.h>

int main() {
    struct msqid_ds msg;

    int key, msgid;
    key = ftok("file.txt", 'a');
    msgid = msgget(key, IPC_CREAT|0744);
    msgctl(msgid, IPC_STAT, &msg);
    printf("Message queue id : %d\n", msgid);
    sleep(10);
    printf("Removing message queue with id : %d\n", msgid);
    msgctl(msgid, IPC_RMID, &msg);
}

/*----------------------------------OUTPUT---------------------------------------
terminal 1
vumma@vumma-VivoBook-15-ASUS-Laptop-X507UF:~/Desktop/SS/HOL2$ gcc 029.c -o 029.out
vumma@vumma-VivoBook-15-ASUS-Laptop-X507UF:~/Desktop/SS/HOL2$ ./029.out
Message queue id : 4
Removing message queue with id : 4

vumma@vumma-VivoBook-15-ASUS-Laptop-X507UF:~/Desktop/SS/HOL2$ ipcs -q

terminal 2
------ Message Queues --------
key        msqid      owner      perms      used-bytes   messages
0x61056ed5 4          vumma      744        0            0

vumma@vumma-VivoBook-15-ASUS-Laptop-X507UF:~/Desktop/SS/HOL2$ ipcs -q

------ Message Queues --------
key        msqid      owner      perms      used-bytes   messages

*/