sharememory.c

//进程通信，共享存储区
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <malloc.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <stdarg.h>
#include <fcntl.h>
#include <fcntl.h>

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

#define SHMKEY 75
int shmid,i;
int *addr;

void client()
{
    int i;
    shmid=shmget(SHMKEY,,);
    addr=shmat(shmid,,);
    ;i>=;i--)
    {
        );
        printf("(client)sent\n");
        *addr=i;
    }
    exit();
}

void server()
{
    shmid=shmget(SHMKEY,,|IPC_CREAT);
    addr=shmat(shmid,,);
    do
    {
        *addr=-;
        );
        printf("(server)received\n");
    }while(*addr);
    shmctl(shmid,IPC_RMID,);
    exit();
}

main()
{
    );
    if(!i)server();
    system("ipcs -m");
    );
    if(!i)client();
    wait();
    wait();
}