System_Software_HandsOnList2/026.c at main · superv13/System_Software_HandsOnList2 · GitHub

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/*
..........................................................................................................................................
Name : 026.c
Author : SHRUTI VERMA
Description : Write a program to send messages to the message queue. Check $ipcs -q
Date : 18 Sep 2025
..........................................................................................................................................
*/

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

int main() {
    int key, msgid;
    key = ftok("file.txt", 'a');
    msgid = msgget(key, IPC_CREAT|0744);

    msgsnd(msgid, "hello there", sizeof("hello there"), 0);
    printf("message sent\n");

    char buf[100];
    msgrcv(msgid, buf, sizeof(buf), 0, 0);
    printf("message received : %s\n", buf);
}

/*----------------------------------OUTPUT---------------------------------------
vumma@vumma-VivoBook-15-ASUS-Laptop-X507UF:~/Desktop/SS/HOL2$ gcc 026.c -o 026.out
vumma@vumma-VivoBook-15-ASUS-Laptop-X507UF:~/Desktop/SS/HOL2$ ./026.out
message sent
message received : hello there
vumma@vumma-VivoBook-15-ASUS-Laptop-X507UF:~/Desktop/SS/HOL2$ ipcs -q

------ Message Queues --------
key        msqid      owner      perms      used-bytes   messages
0x61056ed5 2          vumma      744        12           1

*/