Linux Message Queue Question!!!

[tyrelltle]

In the code below I simply want to send a message to an message queue. and output the number of messages in the queue. But the output is 0.....

could any one provide a solution to this so that once I send a message to the queue, the queue size++?

Thanks very much!!!

#include <stdio.h>
#include <stdlib.h>
#include <linux/ipc.h>
#include <linux/msg.h>
#include <sys/types.h>
#include <wait.h>
#include <unistd.h>
#include <errno.h>

typedef struct
{
  long mtype;
  int veh_type;//1: car, 2: truck
  int pid; //msg id
} msg;

main()
{    msg message;
    message.mtype=1;
    message.veh_type=0;
    message.pid=0;

    int qid=msgget(111,IPC_CREAT|0666);
    msgsnd(qid,&message,sizeof(msg),0);

    struct msqid_ds buf;
  
    msgctl(qid,IPC_STAT,&buf);
    int result=buf.msg_qnum;
    printf("%d\n",result);
    msgctl(qid,IPC_RMID,0);
}

[Salem]

All the functions return a success/fail status.

Perhaps you can begin with checking those things.