Linux_OS_MsgQ_Snd.cpp

/*
 * @Author: xuezaigds@gmail.com
 * @Last Modified time: 2016-08-31 21:34:31
 */

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/msg.h>
#include <errno.h>

#define MAX_TEXT 512
struct msg_st
{
    long int msg_type;
    char text[MAX_TEXT];
};

int main()
{
    int running = 1;
    struct msg_st data;
    char buffer[BUFSIZ];
    int msgid = -1;

    //建立消息队列
    msgid = msgget((key_t)1234, 0666 | IPC_CREAT);
    if(msgid == -1)
    {
        fprintf(stderr, "Msgget failed with error: %d\n", errno);
        exit(EXIT_FAILURE);
    }

    //向消息队列中写消息，直到写入end
    while(running)
    {
        //输入数据
        printf("Enter some text: ");
        fgets(buffer, BUFSIZ, stdin);
        // 消息类型
        data.msg_type = 1;
        strcpy(data.text, buffer);
        //向队列发送数据
        if(msgsnd(msgid, (void*)&data, MAX_TEXT, 0) == -1)
        {
            fprintf(stderr, "Msgsnd failed\n");
            exit(EXIT_FAILURE);
        }
        //输入end结束输入
        if(strncmp(buffer, "end", 3) == 0)
            running = 0;
        sleep(1);
    }
    exit(EXIT_SUCCESS);
}