linux 消息队列 消息个数

ipcs -q

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

struct msgbuf {
    long mtype;       /* message type, must be > 0 */
    char mtext[128];    /* message data */
};

int main() {
    key_t key = ftok("/tmp/msgqueue", 65);
    int msgid = msgget(key, 0666 | IPC_CREAT);

    struct msgbuf message;
    message.mtype = 1;
    strcpy(message.mtext, "Hello, World!");

    msgsnd(msgid, &message, sizeof(message.mtext), 0);
    printf("Message sent\n");

    return 0;
}

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

struct msgbuf {
    long mtype;       /* message type, must be > 0 */
    char mtext[128];    /* message data */
};

int main() {
    key_t key = ftok("/tmp/msgqueue", 65);
    int msgid = msgget(key, 0666 | IPC_CREAT);

    struct msgbuf message;
    msgrcv(msgid, &message, sizeof(message.mtext), 1, 0);
    printf("Received message: %s\n", message.mtext);

    msgctl(msgid, IPC_RMID, NULL); // Remove the queue

    return 0;
}