代碼示例_IPC_消息隊列

消息隊列

 

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1.頭文件

#pragma once

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

typedef struct msgbuf{
    long mtype;
    char mtext[20];
}msgbuf;

 

2.server

#include"msg.h"

int main(void)
{
    key_t key = ftok("/", 0x1111);  // 獲取惟一鍵值
    if(key<0){
        perror("ftok failed");
        exit(1);
    }


    int msgid = msgget(key,0666|IPC_CREAT); // 獲取消息隊列標識符
    if(msgid<0){
        perror("msgget failed");
        exit(1);
    }

    msgbuf *buf = NULL;
    buf = (msgbuf*)malloc(sizeof(msgbuf));    // 寫
    if(buf==NULL){
        perror("malloc");
        exit(1);
    }

    buf->mtype = 10;

    while(1){
        fgets(buf->mtext,20,stdin);
        msgsnd(msgid,buf,sizeof(((msgbuf*)0)->mtext),0);
        printf("send success %s",buf->mtext);
        if(strncmp("quit",buf->mtext,4)==0)
            break;
    }

    msgctl(msgid,IPC_RMID,NULL);  // 刪除

    return 0;
}

 

3.client

#include "msg.h"

int main(void)
{
    key_t key = ftok("/",0x1111);   // 獲取惟一鍵值
    if(key<0){
        perror("ftok failed");
        exit(1);
    }


    int msgid = msgget(key,0666); //建立消息隊列標識符
    if(msgid<0){
        perror("msgget failed");
        exit(1);
    }

    msgbuf buf;

    //  讀
    while(1){
        int a =    msgrcv(msgid, &buf, sizeof(((msgbuf*)0)->mtext),0,0);
        if(a=0)
            printf("not rcv");
        if(strncmp("quit",buf.mtext,4)==0)
            break;
        printf("%s",buf.mtext);
    }

    msgctl(msgid,IPC_RMID,NULL);  // 刪除

    return 0 ;
}

 

 

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 success ！