写一份C语言实现消息队列程序

下面是一份用C语言实现消息队列程序的代码：

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

#define MAX_TEXT 512

struct message {
    long int message_type;
    char message_text[MAX_TEXT];
};

int main() {
    key_t key;
    int msgid;
    struct message message;

    key = ftok(".", 'a');
    msgid = msgget(key, 0666 | IPC_CREAT);
    if (msgid == -1) {
        perror("msgget failed with error");
        exit(EXIT_FAILURE);
    }

    while (1) {
        printf("Enter message type (positive integer only, 0 to exit): ");
        scanf("%ld", &message.message_type);
        if (message.message_type == 0) {
            break;
        }
        printf("Enter message text: ");
        scanf("%s", message.message_text);

        if (msgsnd(msgid, (void *) &message, MAX_TEXT, 0) == -1) {
            perror("msgsnd failed with error");
            exit(EXIT_FAILURE);
        }
        printf("Message sent\n");
    }

    if (msgctl(msgid, IPC_RMID, NULL) == -1) {
        perror("msgctl(IPC_RMID) failed with error");
        exit(EXIT_FAILURE);
    }
    exit(EXIT_SUCCESS);
}

这份代码实现了一个简单的消息队列程序，该程序可以向消息队列中发送消息。您可以输入消息类型（必须为正整数）和消息文本，该程序将把消息放入消息队列中。输入0退出程序并删除消息队列。