test11_3.txt

linux under the C programming which complementary with the book of <linux under the C programming

#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdio.h>

#define BUF_SIZE 1024
#define MYKEY 24

int main(void)
{
    	int shmid;
    	char *shmptr;
   
    	if(shmid=shmget(MYKEY, BUF_SIZE, IPC_CREAT)==-1)
    	{
        	printf("shmget error! \n");
        	exit(1);
    	}
    
	if((shmptr=shmat(shmid,0,0))==( void*)-1)
	{
    		fprintf(stderr,"shmat error!\n");
    		exit(1);
	}

	while(1)
	{
    		printf("string: %s \n", shmptr);
    		sleep(3000);
	}

	exit(0);
}