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socketwrapper.c
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socketwrapper.c
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/********************************************************************/
/* Copyright (C) SSE-USTC, 2012 */
/* */
/* FILE NAME : socketwraper.c */
/* PRINCIPAL AUTHOR : Mengning */
/* SUBSYSTEM NAME : network */
/* MODULE NAME : socketwraper */
/* LANGUAGE : C */
/* TARGET ENVIRONMENT : Linux */
/* DATE OF FIRST RELEASE : 2012/12/13 */
/* DESCRIPTION : the interface to Linux system(socket) */
/********************************************************************/
/*
* Revision log:
*
* Created by Mengning,2012/12/13
* Support epoll,by Mengning,2012/12/18
*
*/
#include"socketwrapper.h"
#include<stdio.h>
#include<stdlib.h>
#include<arpa/inet.h> /* internet socket */
#include<string.h>
#include<sys/epoll.h>
#include<fcntl.h>
#define debug
int listenfd = -1;
int epollfd = -1;
/* private macro */
#define PrepareSocket(addr,port) \
struct sockaddr_in serveraddr; \
struct sockaddr_in clientaddr; \
socklen_t addr_len = sizeof(struct sockaddr); \
serveraddr.sin_family = AF_INET; \
serveraddr.sin_port = htons(port); \
serveraddr.sin_addr.s_addr = inet_addr(addr); \
memset(&serveraddr.sin_zero, 0, 8); \
listenfd = socket(PF_INET,SOCK_STREAM,0); \
if(listenfd == -1) \
{ \
fprintf(stderr,"Socket Error,%s:%d\n", \
__FILE__,__LINE__); \
close(listenfd); \
return -1; \
}
#define InitServer() \
int ret = bind( listenfd, \
(struct sockaddr *)&serveraddr, \
sizeof(struct sockaddr)); \
if(ret == -1) \
{ \
fprintf(stderr,"Bind Error,%s:%d\n", \
__FILE__,__LINE__); \
close(listenfd); \
exit(-1); \
} \
listen(listenfd,MAX_LISTEN_QUEUE);
int SetNonBlocking(int fd)
{
int opts;
opts = fcntl(fd,F_GETFL);
if(opts < 0)
{
fprintf(stderr,"fcntl(sock,GETFL) Error,%s:%d\n", __FILE__,__LINE__);
exit(1);
}
/* set non blocking */
opts = opts|O_NONBLOCK;
if(fcntl(fd,F_SETFL,opts) < 0)
{
fprintf(stderr,"fcntl(sock,SETFL,opts) Error,%s:%d\n", __FILE__,__LINE__);
exit(1);
}
}
/*
* InitServer
* input : addr - server ip address
* input : port - server port to open
* output : None
* in/out : None
* return : if SUCCESS return 0
* : if FAILURE return (-1)
*/
int InitializeNetService(char * addr,short int port)
{
struct epoll_event event;
PrepareSocket(addr,port);
epollfd = epoll_create(MAX_CONNECT_FD);
SetNonBlocking(listenfd);
event.data.fd = listenfd;
event.events = EPOLLIN;
epoll_ctl(epollfd,EPOLL_CTL_ADD,listenfd,&event);
InitServer();
return 0;
}
int ShutdownNetService()
{
if(listenfd == -1)
{
return -1;
}
close(listenfd);
if(epollfd == -1)
{
return -1;
}
close(epollfd);
return 0;
}
/*
* OpenRemoteService - Only used in Client side,it connects Server.
* input : addr - server ip address
* input : port - server port to open
* output : None
* in/out : None
* return : if SUCCESS return tServiceHandler
* : if FAILURE return (-1)
*/
tServiceHandler OpenRemoteService(char * addr,short int port)
{
struct sockaddr_in serveraddr;
struct sockaddr_in clientaddr;
socklen_t addr_len = sizeof(struct sockaddr);
serveraddr.sin_family = AF_INET;
serveraddr.sin_port = htons(port);
serveraddr.sin_addr.s_addr = inet_addr(addr);
memset(&serveraddr.sin_zero, 0, 8);
int fd = socket(PF_INET,SOCK_STREAM,0);
if(fd == -1)
{
fprintf(stderr,"Socket Error,%s:%d\n", __FILE__,__LINE__);
close(fd);
return -1;
}
int ret = connect(fd,(struct sockaddr *)&serveraddr,sizeof(struct sockaddr));
if(ret == -1)
{
fprintf(stderr,"Connect Error,%s:%d\n",__FILE__,__LINE__);
exit(-1);
}
return (tServiceHandler)fd;
}
/*
* CloseRemoteService - Only used in Client side,it terminate connection.
* input : h - it MUST BE what OpenRemoteService returns.
* output : None
* in/out : None
* return : if SUCCESS return 0
* : if FAILURE return (-1)
*/
int CloseRemoteService(tServiceHandler h)
{
if(h <= 0)
{
return -1;
}
close(h);
return 0;
}
/*
* ServiceStart - Only used in Sever side,when client requests.
* hide client connectionn,JUST return client who have real data request
* input : None
* output : None
* in/out : None
* return : if SUCCESS return tServiceHandler
* : if FAILURE return (-1)
*/
tServiceHandler ServiceStart()
{
while(1)
{
struct epoll_event event[1];
int fdnum = epoll_wait(epollfd,event,1,-1);
if(event[0].data.fd == listenfd)
{
struct sockaddr_in clientaddr;
socklen_t addr_len = sizeof(struct sockaddr);
int newfd = accept( listenfd,(struct sockaddr *)&clientaddr,&addr_len);
if(newfd < 0)
{
fprintf(stderr,"Accept Error,%s:%d\n", __FILE__,__LINE__);
}
SetNonBlocking(newfd);
struct epoll_event ev;
memset(&ev, 0, sizeof(ev));
ev.data.fd = newfd;
ev.events = EPOLLIN | EPOLLET;
epoll_ctl(epollfd,EPOLL_CTL_ADD,newfd,&ev);
}
/* close by peer */
else if(event[0].events & EPOLLOUT)
{
close(event[0].data.fd);
}
else if(event[0].events & EPOLLIN)
{
if(event[0].data.fd < 0)
{
continue;
}
return (tServiceHandler)event[0].data.fd;
}
}
}
/*
* ServiceStop - Only used in Sever side,when client connects it return.
* input : h - it MUST BE what ServiceStart OR returns.
* output : None
* in/out : None
* return : if SUCCESS return 0
* : if FAILURE return (-1)
*/
int ServiceStop(tServiceHandler h)
{
if(h <= 0)
{
return -1;
}
close(h);
return 0;
}
/*
* SendData - send data to peer side
* input : h - it MUST BE what ServiceStart or OpenRemoteService returns.
* input : pBuf - point to data
* input : BufSize - the length of data bytes
* output : None
* in/out : None
* return : if SUCCESS return BufSize sended
* : if FAILURE return (-1)
* : if Connection Terminals return 0
*/
int SendData(tServiceHandler h,char * pBuf,int BufSize)
{
int ret = send(h,pBuf,BufSize,0);
if(ret < 0 || ret != BufSize)
{
fprintf(stderr,"Send Error,%s:%d\n",__FILE__,__LINE__);
return -1;
}
return ret;
}
/*
* SendData - send data to peer side
* input : h - it MUST BE what ServiceStart or OpenRemoteService returns.
* in/out : pBuf - point to memory that will store recved data
* in/out : pBufSize - the max length of data to recv
* return : if SUCCESS return BufSize recved
* : if FAILURE return (-1)
* : if Connection Terminals return 0
*/
int RecvData(tServiceHandler h,char * pBuf,int *pBufSize)
{
int ret = recv(h,pBuf,*pBufSize,0);
if(ret < 0)
{
fprintf(stderr,"Recv Error,%s:%d\n",__FILE__,__LINE__);
*pBufSize = 0;
return -1;
}
*pBufSize = ret;
return ret;
}