linux消息队列代码跑不通

消息队列的代码老是不成功，我是参照《linux网络编程》4.2.4编写的

#include
#include
#include
#include
#include
#include
#include
#include
#include

//显示消息队列属性的函数
void show_msg_attr(int msgid, struct msqid_ds msg_info) {
    int ret = -1;
    sleep(1);
    ret = msgctl(msgid, IPC_STAT, &msg_info);
    if(ret == -1) {
        puts("获取消息失败");
        return ;
    }
    printf("现在队列中的字节数: %ld\n",msg_info.__msg_cbytes);
    printf("消息队列中消息数: %ld\n",msg_info.msg_qnum);
    printf("消息队列中最大字节数: %ld\n",msg_info.msg_qbytes);
    printf("最后发送消息的进程pid : %d\n",msg_info.msg_lspid);
    printf("最后接收消息的进程pid : %d\n",msg_info.msg_lrpid);
    printf("最后发送消息的时间 : %ld\n",msg_info.msg_stime);
    printf("最后接收消息的时间 : %ld\n",msg_info.msg_rtime);
    printf("消息的最后变化时间 : %ld\n",msg_info.msg_ctime);
    printf("消息UID是 : %d",msg_info.msg_perm.uid);
    printf("消息GID是 : %d",msg_info.msg_perm.gid);
}

int main(int argc, char *argv[]) {
    int ret = -1;
    int msg_flags, msg_id;key_t key;
    struct msgmbuf {
        int mtype;
        char mtext[20];
    };
    struct msqid_ds msg_info;
    struct msgmbuf msg_buf;
    int msg_send_flags, msg_rece_flags;

    key = ftok("/home/luoxin/",'b');
    if(key == -1) {
        puts("建立KEY失败");
        return -1;
    }
    else {
        puts("成功建立KEY");
        printf("key = 0x%x\n",key);
    }
    msg_flags = IPC_CREAT ;
    msg_id = msgget(key, msg_flags);
    if(msg_id == -1) {
        puts("消息队列建立失败");
        return -1;
    }
    else {
        puts("消息队列建立成功");
        printf("msgid = %d\n",msg_id);
    }
    show_msg_attr(msg_id, msg_info);

    msg_send_flags = IPC_NOWAIT;
    msg_buf.mtype = 10;
    memcpy(msg_buf.mtext, "测试消息", sizeof("测试消息"));
    ret = msgsnd(msg_id, &msg_buf, sizeof("测试消息"), msg_send_flags);
    if(ret == -1) {
        puts("消息发送失败");
        return -1;
    }
    show_msg_attr(msg_id, msg_info);

    msg_rece_flags = IPC_NOWAIT | MSG_NOERROR;
    memset(msg_buf.mtext,0, 10);
    ret = msgrcv(msg_id, &msg_buf, 10, 10, msg_rece_flags);
    if(ret == -1) {
        puts("接收消息失败");
        return -1;
    }
    else {
        printf("接收消息成功，消息为: %s\n",msg_buf.mtext);
    }
    show_msg_attr(msg_id, msg_info);
}