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int creat_msg_queue()
{
  key_t key;
  int proj_id;
  int msqid;

  struct msqid_ds buffer;

  proj_id=2;
  key=ftok("/home/program",proj_id);
  if(key==-1){
  perror("cannot generate the IPC key");
  return -1;
  }

  msqid=msgget(key,IPC_CREAT | 0660);
  if(msqid==-1){
  perror("cannot create message queue resource");
  return -1;
  }

  printf("msqid=%d\n",msqid);

return msqid;
}

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C/C++ code:

#include <stdio.h>
# include <sys/ipc.h>
#include <sys/types.h>
#include <sys/msg.h>
#include <unistd.h>

int creat_msg_queue()
{
key_t key;
int proj_id;
int msqid;

struct msqid_ds buffer;

proj_id=2;
key=ftok("/home/program",proj_id);
if(key==