#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>

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

#define FTOK_PATH            "/dev/zero"
#define FTOK_PROJID          0x22

typedef struct s_msgbuf 
{
     long  mtype; 
     char  mtext[512]; 
} t_msgbuf;

int main(int argc, char **argv)
{
    key_t             key;
    int               msgid;
    t_msgbuf          msgbuf;
    int               msgtype;
    int               i;

    if( (key=ftok(FTOK_PATH, FTOK_PROJID)) < 0 ) 
    {   
	printf("ftok() get IPC token failure: %s\n", strerror(errno)); 
	return -1;
    }

    msgid = msgget(key, IPC_CREAT|0666);
    if( msgid < 0)
    {
	printf("shmget() create shared memroy failure: %s\n", strerror(errno));
	return -2;
    }

    msgtype = (int)key;
    printf("key[%d] msgid[%d] msgypte[%d]\n", (int)key, msgid, msgtype);

    for(i=0; i<4; i++)
    {
        msgbuf.mtype = msgtype;
        strcpy(msgbuf.mtext,"Ping");

	if( msgsnd(msgid, &msgbuf, sizeof(msgbuf.mtext), IPC_NOWAIT) < 0)
	{
            printf("msgsnd() send message failure: %s\n", strerror(errno));
	    break;
	}
	printf("Send message: %s\n", msgbuf.mtext);

	sleep(1);
    }

    msgctl(msgid, IPC_RMID, NULL);

    return 0;
}