学步园

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

#define SHMKEY 75

int shmid , i ;
int  * addr;

void CLIENT()
{
   int i;
   shmid = shmget(SHMKEY, 1024,0777|IPC_CREAT);
   addr = shmat(shmid,0,0);
   for(i = 9 ; i>= 0 ; i --)
   {
      while(* addr != -1);
      printf("(client)sent/n");
      * addr = i;
   }
   exit(0);
}

void SERVER()
{
   shmid = shmget(SHMKEY,1024,0777|IPC_CREAT);
   addr = shmat(shmid,0,0);
   do
   {
       * addr = -1;
       while(* addr == -1);
        printf("(server)received/n");
   }while(* addr);
   shmctl(shmid,IPC_RMID,0);
   exit(0);
}

int main()
{
  while((i= fork())==-1);
  if(!i) SERVER();
  while((i= fork())==-1);
  if(!i) CLIENT();
   wait(0);
   wait(0);
}

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