shmread

/*****************************************************

copyright (C), 2014-2015, Lighting Studio. Co.,     Ltd.

File name：

Author：Jerey_Jobs    Version:0.1    Date:

Description：

Funcion List:

*****************************************************/

 

#include <stdio.h>

#include <unistd.h>

#include <stdlib.h>

#include <sys/shm.h>

#include "shmdata.c"

#include <string.h>

 

 

int main()

{

    int running = 1;

    void *shm = NULL;

    struct shared_use_st * shared;

    int shmid;

    

    shmid = shmget((key_t)1234,sizeof(struct shared_use_st),0666|IPC_CREAT);

 

    if(shmid == -1)

    {

        fprintf(stderr,"shmget failed\n");

        exit(EXIT_FAILURE);

    }

    shm = shmat(shmid,0,0);

    if(shm == (void*)-1)

    {

        fprintf(stderr,"shmat failed\n");

        exit(EXIT_FAILURE);

    }

    printf("\n memary attached at %d\n",(int)shm);

 

    shared = (struct shared_use_st *)shm;

    shared->written = 0;

    while(running)

    {

        if(shared->written != 0)

        {

            printf("you wrote : %s\n",shared->text);

            sleep(rand()%3);

            shared->written = 0;

            if(strncmp(shared->text,"end",3) == 0)

                running = 0;

        }

        else

            sleep(1);

    }

    if(shmdt(shm) == -1)

    {

        fprintf(stderr,"shmdt failed\n");

        exit(EXIT_FAILURE);

    }

    if(shmctl(shmid,IPC_RMID,0) == -1)

    {

        fprintf(stderr,"stmctl failed\n");

        exit(EXIT_FAILURE);

    }

    

    exit(EXIT_SUCCESS);

    return 0;

}