MOHAMEDAAKIFASRAR / Linux-IPC-Message-Queues

Linux IPC-Message Queues

NAME:MOHAMED AAKIF ASRAR S

REGISTER NUMBER:212223240088

Linux-IPC-Message-Queues

Linux IPC-Message Queues

AIM:

To write a C program that receives a message from message queue and display them

DESIGN STEPS:

Step 1:

Navigate to any Linux environment installed on the system or installed inside a virtual environment like virtual box/vmware or online linux JSLinux (https://bellard.org/jslinux/vm.html?url=alpine-x86.cfg&mem=192) or docker.

Step 2:

Write the C Program using Linux message queues API

Step 3:

Execute the C Program for the desired output.

PROGRAM:

C program that receives a message from message queue and display them

writer.c
 // C Program for Message Queue (Writer Process) 
#include <stdio.h> 
#include <sys/ipc.h> 
#include <sys/msg.h> 
// structure for message queue 
struct mesg_buffer { 
long mesg_type; 
char mesg_text[100]; 
} message; 
int main() 
{ 
key_t key; 
int msgid;
 // ftok to generate unique key 
key = ftok("progfile", 65); 
// msgget creates a message queue 
// and returns identifier 
msgid = msgget(key, 0666 | IPC_CREAT); 
message.mesg_type = 1; 
printf("Write Data : "); 
gets(message.mesg_text); 
// msgsnd to send message 
msgsnd(msgid, &message, sizeof(message), 0); 
// display the message 
printf("Data send is : %s \n", message.mesg_text); 
return 0; 
} 
reader.c
 // C Program for Message Queue (Reader Process)
 #include <stdio.h>
 #include <sys/ipc.h>
 #include <sys/msg.h>
 // structure for message queue
 struct mesg_buffer {
 long mesg_type;
 char mesg_text[100];
 } message;
 int main()
 {
 key_t key;
 int msgid;
 // ftok to generate unique key
 key = ftok("progfile", 65);
 // msgget creates a message queue
 // and returns identifier
 msgid = msgget(key, 0666 | IPC_CREAT);
 // msgrcv to receive message
 msgrcv(msgid, &message, sizeof(message), 1, 0);
 // display the message
 printf("Data Received is : %s \n",
 message.mesg_text);
 // to destroy the message queue
 msgctl(msgid, IPC_RMID, NULL);
 return 0;
 }

OUTPUT

RESULT:

The programs are executed successfully.