connect.c

一个多进程通信的演示

// copy

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <sys/types.h>
#include <linux/sem.h>
#include <linux/shm.h>

#include "connect.h"

int shmid;

struct Pos
{
	int x;
	int y;
};

struct Pos* pos;


#define 	POS_ID		600


int initConnect()
{

	shmid = shmget( POS_ID, sizeof( struct Pos ), IPC_CREAT|0666 );
	if( shmid < 0 ){
		printf("error");
		return 0;	
	}	
	
	pos = (struct Pos*)shmat( shmid, NULL, SHM_R|SHM_W);
	
	printf("proc1 connect init success!\n");

	return 1;
}

void getPos( int *x, int *y )
{
	*x = pos->x;
	*y = pos->y;
}