child.c

一个在linux实现进程通信的例子,使用socket技术,相信对想了解进程通信的人有用用途

#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define CHILDPORT 1234
#define PARENTPORT 2234
#define MAXSOCKFD 10
struct msg
{
	int processid;
	char strmsg[100];
};

int main(void)
{
	struct msg childmsg;
	int childid;
	//create socket
	int sockfd;
	struct sockaddr_in addr;
	struct sockaddr_in remote_addr;
	struct sockaddr_in parent_addr;
	int parent_len=sizeof(struct sockaddr_in);
	int addr_len=sizeof(struct sockaddr_in);
	int remote_len=sizeof(struct sockaddr_in);
	
	//local
	char buffer[256];
	if((sockfd=socket(AF_INET,SOCK_DGRAM,0))<0)
	{
		perror("socket");
		exit(1);
	}
	bzero(&addr,sizeof(addr));
	addr.sin_family=AF_INET;
	addr.sin_port=htons(CHILDPORT);
	addr.sin_addr.s_addr=htonl(INADDR_ANY);
	if(bind(sockfd,&addr,sizeof(addr))<0)
	{
		perror("connect");
		exit(1);
	}

	//parent
	bzero(&parent_addr,sizeof(parent_addr));
	parent_addr.sin_family=AF_INET;
	parent_addr.sin_port=htons(PARENTPORT);
	parent_addr.sin_addr.s_addr=htonl(INADDR_ANY);
	
	childid = getpid();
	while(1)
	{
		//recv msg from parent
		recvfrom(sockfd,buffer,sizeof(buffer),0,&remote_addr,&remote_len);
		memset(&childmsg,0,sizeof(struct msg));
		memcpy(&childmsg,buffer,sizeof(struct msg));
		printf("The parent processid is %d,and the content is %s\n",childmsg.processid,childmsg.strmsg);
		sleep(1);
		//send msg to parent
		childmsg.processid=childid;
		strcpy(childmsg.strmsg,"hello parent i am your childe");
		memcpy(buffer,&childmsg,sizeof(struct msg));
		sendto(sockfd,buffer,256,0,&parent_addr,parent_len);
		sleep(1);
		
	}
	sleep(5);
	printf("process [%d]:child terminating...\n",getpid());
}