运用消息队列进行进程间通信

最新推荐文章于 2022-03-13 18:53:59 发布

mazheng1989

最新推荐文章于 2022-03-13 18:53:59 发布

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分类专栏： c/c++ linux编程文章标签： compiler struct gcc

本文链接：https://blog.youkuaiyun.com/mazheng1989/article/details/7346139

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本文提供了一个使用消息队列进行进程间通信的C语言示例。包括发送端与接收端的完整代码，展示了如何创建消息队列、发送消息及接收消息的过程。

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发送消息端：

/*
 * =====================================================================================
 *
 *       Filename:  message_send.c
 *
 *    Description:  
 *
 *        Version:  1.0
 *        Created:  2012年03月11日 21时33分45秒
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  MaZheng (blog.youkuaiyun.com/mazheng1989), mazheng19891019@gmail.com
 *        Company:  Dalian University Of Technology
 *
 * =====================================================================================
 */

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

#define MSGSZ     128


/*
 * Declare the message structure.
 */

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

int main()
{
    int msqid;
    int msgflg = IPC_CREAT | 0666;
    key_t key;
    message_buf sbuf;
    size_t buf_length;

    /*
     * Get the message queue id for the
     * "name" 1234, which was created by
     * the server.
     */
    key = 1234;

(void) fprintf(stderr, "\nmsgget: Calling msgget(%#lx,\
%#o)\n",
key, msgflg);

    if ((msqid = msgget(key, msgflg )) < 0) {
        perror("msgget");
        exit(1);
    }
    else 
     (void) fprintf(stderr,"msgget: msgget succeeded: msqid = %d\n", msqid);


    /*
     * We'll send message type 1
     */
     
    sbuf.mtype = 1;
    
    (void) fprintf(stderr,"msgget: msgget succeeded: msqid = %d\n", msqid);
    
    (void) strcpy(sbuf.mtext, "Did you get this?");
    
    (void) fprintf(stderr,"msgget: msgget succeeded: msqid = %d\n", msqid);
    
    buf_length = strlen(sbuf.mtext) + 1 ;
    
    

    /*
     * Send a message.
     */
    if (msgsnd(msqid, &sbuf, buf_length, IPC_NOWAIT) < 0) {
       printf ("%d, %d, %s, %d\n", msqid, sbuf.mtype, sbuf.mtext, buf_length);
        perror("msgsnd");
        exit(1);
    }

   else 
      printf("Message: \"%s\" Sent\n", sbuf.mtext);
      
    exit(0);
}

接收消息端：

/*
 * =====================================================================================
 *
 *       Filename:  message_rec.c
 *
 *    Description:  
 *
 *        Version:  1.0
 *        Created:  2012年03月11日 21时36分28秒
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  MaZheng (blog.youkuaiyun.com/mazheng1989), mazheng19891019@gmail.com
 *        Company:  Dalian University Of Technology
 *
 * =====================================================================================
 */

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

#define MSGSZ     128


/*
 * Declare the message structure.
 */

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


int main()
{
    int msqid;
    key_t key;
    message_buf  rbuf;

    /*
     * Get the message queue id for the
     * "name" 1234, which was created by
     * the server.
     */
    key = 1234;

    if ((msqid = msgget(key, 0666)) < 0) {
        perror("msgget");
        exit(1);
    }

    
    /*
     * Receive an answer of message type 1.
     */
    if (msgrcv(msqid, &rbuf, MSGSZ, 1, 0) < 0) {
        perror("msgrcv");
        exit(1);
    }

    /*
     * Print the answer.
     */
    printf("%s\n", rbuf.mtext);
    exit(0);
}