OS Message Queue C Program

Operating Systems Lab Manual / OS Message Queue C Program

Program Name:Write a C Program for Message Queue in operating System.

Theory

Message Queue is a buffer used to store messages (like requests, replies, error messages, or just plain information.) 
temporarily, and endpoints that allow software components to connect to the queue in order to send and receive messages.

Program Code

#include<stdio.h> 
#include<sys/types.h> 
#include<sys/ipc.h> 
#include<sys/msg.h> 
#include<string.h> 
struct msgbuf
{
long mtype; char mtext[50];
}m,m1; 

int main()
{
int msgid,k,s; m.mtype=1;
msgid=msgget((key_t) 40,IPC_CREAT|0666); 
strcpy(m.mtext,"Welcome to OS!"); 
s=msgsnd(msgid,(struct msgbuf*)&m,sizeof(m),0); 
k=msgrcv(msgid,(struct msgbuf*)&m1,sizeof(m1),1,0); 
printf("\nreturn value of send: %d",s); 
printf("\nreturn value of recived: %d",k); 
printf("\nmsg recieved: %s",m.mtext);
return 0;
}

Input:
Welcome to OS!

Output:
return value of send: 0
return value of recived: 64
msg recieved: Welcome to OS!

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