linux消息队列

使用 ipcs -q 查看消息队列的消息接收情况

 

队列消息读取端

/*MessageRead.c   */
#include<stdlib.h>
#include<stdio.h>
#include<sys/types.h>
#include<sys/ipc.h>
#include<sys/msg.h>
#include<errno.h>
#include<string.h>

#define MAX_TEXT 512  

struct my_msg_st
{
        long int my_msg_type;
        char some_text[MAX_TEXT];
};

int main()
{
        int running = 1;
        struct my_msg_st some_data;
        int msgid;
        long int msg_to_receive = 0;

        msgid = msgget((key_t)1234,0666 | IPC_CREAT);

        if (msgid == -1){
                fprintf(stderr,"msgget failed with error: %d\n",errno);
                exit(1);
        }
        while(running){
                if(msgrcv(msgid,(void*)&some_data,BUFSIZ,msg_to_receive,0) == -1){
                        fprintf(stderr,"msgrcv failed with error :%d\n",errno);
                        exit(1);
                }

                printf("you wrote :%s",some_data.some_text);
                if(strncmp(some_data.some_text,"end",3) == 0){
                        running = 0;
                }
        }

                if(msgctl(msgid,IPC_RMID,0) == -1){
                        fprintf(stderr,"msgctl(IPC_RMID) failed with error :%d\n",errno);
                        exit(1);
                }

        return 0;

}

队列消息写入端

/*MessageWrite.c   */
#include<stdlib.h>
#include<errno.h>
#include<stdio.h>
#include<sys/types.h>
#include<sys/ipc.h>
#include<sys/msg.h>
#include<string.h>

#define MAX_TEXT 512  

struct my_msg_st
{
        long int my_msg_type;
        char some_text[MAX_TEXT];
};

int main()
{
        int running = 1;
        struct my_msg_st some_data;
        int msgid;
        char buffer[BUFSIZ];

        printf("BUFSIZ = %d\n",BUFSIZ);
        msgid = msgget((key_t)1234,0666 | IPC_CREAT);
        if (msgid == -1){
                fprintf(stderr,"msgget failed with error: %d\n",errno);
                exit(1);
        }
        while(running){
                printf("Enter some text: ");
                fgets(buffer,BUFSIZ,stdin);
                some_data.my_msg_type = 1;
                strcpy(some_data.some_text,buffer);
                if(msgsnd(msgid,(void*)&some_data,MAX_TEXT,0) == -1){
                        fprintf(stderr,"msgsnd failed\n");
                        exit(1);
                }
                if(strncmp(buffer,"end",3) == 0){
                        running = 0;
                }
        }
return 0;


}

详细可参考博客：https://blog.youkuaiyun.com/wei_cheng18/article/details/79661495