Send data to parent process in Qt

I have an application where i launched a process (using QProcess) , from this process i need to send a message to parent process.

from parent

Code:

---

int msgid = msgget(0x1234,IPC_CREAT|0666);
    char str[50];
    qDebug() << "waiting for msg ";
        msgrcv(msgid,str,sizeof str,0,0);
 
    if (!strcmp(str,"sender")){
        /*do some processing */
    }

---

from the child

Code:

---

int msgid = msgget(0x1234,IPC_CREAT|0666);
    char str[]="sender";
    qDebug() << "sending  for msg ";
    msgsnd(msgid,str,strlen(str)+1,0);

---

i am getting a msg "waiting for msg" and system is going to hang. what is the problem?

how else will pass msg from one process to other.

Thanks.

what does your code have to do with Qt?

Look at QProcess for reading standard / error output