Problem Running Message Queue on two terminals - c

Question

I am trying to run two processes which are basically sending and receiving messages using message queue(SYS V). While I can run two process on same terminal tab by keeping my receiver in background
./receiver &
and sender in the foreground.
./sender
which is working fine but causing all my prints from sender & receiver display on same tab.
If I try to run receiver on one terminal tab and sender on other terminal-tab, the processes are not working correctly, they fail to identify message queue exist on the system.
I am not sure if its the terminal issue, or my program issue, I am using MobaXterm terminal.
Added code below, Am I missing w.r.t running processes on two different terminals I would like to know.
receiver.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#define PATH "/tmp/CMN_KEY"
struct message_text {
int qid;
char buf [200];
};
struct message {
long message_type;
struct message_text message_text;
};
int main (int argc, char **argv)
{
key_t key;
int qid;
struct message message;
if ((key = ftok (PATH,'Z')) == -1) {
printf ("ftok");
exit (1);
}
if ((qid = msgget (key, IPC_CREAT | 0660)) == -1) {
printf ("msgget");
exit (1);
}
printf ("Receiver: Waiting for MSG!\n");
while (1) {
// read an incoming message
if (msgrcv (qid, &message, sizeof (struct message_text), 0, 0) == -1) {
printf ("msgrcv");
exit (1);
}
printf ("Receiver: MSG Received.\n");
// message from sender
int length = strlen (message.message_text.buf);
char buf [20];
sprintf (buf, " %d", length);
strcat (message.message_text.buf, buf);
int client_qid = message.message_text.qid;
message.message_text.qid = qid;
// send reply message to Sender
if (msgsnd (client_qid, &message, sizeof (struct message_text), 0) == -1) {
printf ("msgget");
exit (1);
}
printf ("Receiver: Response sent to Sender .\n");
}
}
sender.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#define PATH "/tmp/CMN_KEY"
struct message_text {
int qid;
char buf [200];
};
struct message {
long message_type;
struct message_text message_text;
};
int main (int argc, char **argv)
{
key_t key;
int sender_qid, myqid;
struct message my_message, return_message;
// queue for receiving messages from receiver
if ((myqid = msgget (IPC_PRIVATE, 0660)) == -1) {
printf ("msgget: myqid");
exit (1);
}
printf("Sender created q with ID: %d\n" , myqid);
if ((key = ftok (PATH,'Z')) == -1) {
printf ("ftok");
exit (1);
}
if ((sender_qid = msgget (key, 0)) == -1) {
printf ("msgget: sender_qid");
exit (1);
}
my_message.message_type = 1;
my_message.message_text.qid = myqid;
printf ("Input a message: ");
while (fgets (my_message.message_text.buf, 198, stdin)) {
int length = strlen (my_message.message_text.buf);
if (my_message.message_text.buf [length - 1] == '\n')
my_message.message_text.buf [length - 1] = '\0';
// send message to Receiver
if (msgsnd (sender_qid, &my_message, sizeof (struct message_text), 0) == -1) {
printf ("client: msgsnd");
exit (1);
}
// read response from Receiver
if (msgrcv (myqid, &return_message, sizeof (struct message_text), 0, 0) == -1) {
printf ("client: msgrcv");
exit (1);
}
// Return message from Receiver
printf ("Return Message From Receiver: %s\n\n", return_message.message_text.buf);
printf ("type a one more message: ");
}
// remove message queue
if (msgctl (myqid, IPC_RMID, NULL) == -1) {
printf ("client: msgctl");
exit (1);
}
return
}