Basic unix server-client IPC(msg queue) issue - c

Question

I'm working on a problem wich implies a basic running server client(done one before). the problem is that I run server than I run client. My msg Que is created i nboth client takes my char as input sends it, i get the confirmation print but my server msgrcv isn't responding.
s.c
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/msg.h>
#include <sys/ipc.h>
#include <errno.h>
#include "struc.h"
int main(){
int qt;
struct msg m;
qt = msgget(1271,IPC_CREAT|IPC_EXCL|0600);
if(qt < 0){ perror("Error MSGGET()\n");}
printf("msg queue created!\n");
if(msgrcv(qt,&m,sizeof(struct msg),0,0)<0){
perror("Msg recive error");
}
printf("msg recived!\n");
msgctl(qt,IPC_RMID,NULL);
return 0;
}
c.c
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/msg.h>
#include <sys/ipc.h>
#include <errno.h>
#include "struc.h"
int main(){
int qt;
struct msg m;
qt = msgget(1271,0);
if(qt < 0){ perror("~~~ Error MSGGET()\n");}
printf("msg created!\n");
printf("Enter one char: !\n");
scanf("%c",&m.c);
msgsnd(qt, &m,sizeof(struct msg),0);
printf("msg sent!\n");
return 0;
}
struc.h
struct msg{
long mtype;
// matrix M;
char c;
};
(By creating the 3 files you cna test it yourself. Any idea is welcome maybe i missed something)

Answer 1

You should do this to verify that sending doesn't fail.
if(msgsnd(qt, &m,sizeof(struct msg),0)) < 0) {
perror("Msg send error");
}
You should also heed the docs for msgsnd:
The msgp argument is a pointer to caller-defined structure of the
following general form:
struct msgbuf {
long mtype; /* message type, must be > 0 */
char mtext[1]; /* message data */
};
That is, you have to set the mtype in the message you send to be > 0. Currently it is uninitialized, so you should do:
m.mtype = 1;
if(msgsnd(qt, &m,sizeof(struct msg),0)) < 0) {
perror("Msg send error");
}