linux c 多进程并发服务器的实现(基于TCP)

server.c
/////////////////////////////////////////////
#include"util.h"
#define SER_IP "127.0.0.1"
#define SER_PORT 6666

char buf[BUFSIZ];
char Cli_IP[BUFSIZ];
void wait_child(int signal)
{
	while(waitpid(0,NULL,WNOHANG)>0);
	return;
}
void ProcessHandler(int connfd,struct sockaddr_in cliaddr)
{
	ssize_t n;
	while(1)
	{
		n=Read(connfd,buf,sizeof(buf));
		if(n==0)       //client close;
		{
			close(connfd);
			return ;
		}
		else if(n==-1)
			perr_exit("read error!\n");
		else
		{
			int i;
			for(i=0;i0)
			close(connfd);
		else
			perr_exit("fork error!\n");

	}
	return 0;
}
//////////////////////////////////////////////////////////////
util.h

#include
#include
#include
#include
#include
#include
#include
#include
#include

#include
#define SERPORT 6666
#define backlogs 10
void perr_exit(const char *s)
{
	perror(s);
	exit(1);
}
int Socket(int domain,int type,int protocol)
{
	int fd=socket(domain,type,protocol);
	if(fd==-1)
		perr_exit("socket error!\n");
	return fd;
}
int Bind(int sockfd,const struct sockaddr *addr,socklen_t addrlen)
{
	int ret=bind(sockfd,addr,addrlen);
	if(ret==-1)	
		perr_exit("bind error!\n");
	return ret;
}
int Listen(int sockfd,int backlog)
{
	int ret=listen(sockfd,backlog);
	if(ret==-1)	
		perr_exit("listen error!\n");
	return ret;
}
int Accept(int sockfd,struct sockaddr *addr,socklen_t *addrlen)//慢速系统调用
{
	int ret;
again:
	if( (ret=accept(sockfd,addr,addrlen)) ==-1)
	{
		if(errno==ECONNABORTED || errno==EINTR)
			goto again;
		else
			perr_exit("accept error!\n");
	}
	return ret;
}
int start_up(const char* ip,int port)
{
	int fd=Socket(AF_INET,SOCK_STREAM,0);
	struct sockaddr_in ser_addr;
	ser_addr.sin_family=AF_INET;
	ser_addr.sin_port=htons(port);
	ser_addr.sin_addr.s_addr=inet_addr(ip);
	int on=1;
	setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(int));
	socklen_t addrlen=sizeof(struct sockaddr);
	Bind(fd,(struct sockaddr*)&ser_addr,addrlen);
	Listen(fd,backlogs);
	return fd;
}
//connect() 不会阻塞
int Connect(int sockfd,const struct sockaddr *addr,socklen_t addrlen)
{
	int ret;
	ret=connect(sockfd,addr,addrlen);
	if(ret==-1)
		perr_exit("connect error!\n");
	return ret;
}

ssize_t Read(int fd,void *buf,size_t nbytes)
{
	ssize_t n;
again:
	if( (n=read(fd,buf,nbytes))==-1)
	{
		if(errno==EINTR)
			goto again;
		else
			perr_exit("read errror!\n");
	}
	return n;
}

ssize_t Write(int fd,void *buf,size_t nbytes)
{
	ssize_t n;
again:
	if( (n=write(fd,buf,nbytes))==-1)
	{
		if(errno==EINTR)
			goto again;
		else
			perr_exit("write errror!\n");
	}
	return n;
}