常用的socket例子
关闭连接
shutdown(m_sock,SHUT_RDWR) //成功返回0,错误-1
设置超时
struct timeval tv;
tv.tv_sec=ms/1000;
tv.tv_usec=(ms00)*1000;
setsockopt(s,1,SO_SNDTIMEO,&tv,sizeof(tv));
//int setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen);
读数据
int Read(char* szBuf,int nLen,int ms/* =-1 */)
{
int lenRecv=0,len,flags=0;
//check socket valid?
//SetTimeOut(ms,1);
for(;nLen>0;nLen-=len) {
len=nLen>1024?1024:nLen;
len=recv(m_sock,
szBuf,len,0);
if(len==0) {
// remote closed the socket
//SetTimeOut(0,1);
return 0;
}
if(len<0)
return -1;
szBuf+=len;
lenRecv+=len;
}
//SetTimeOut(0,1);
return lenRecv;
发送send
int sndbuf=1024;
int flags=0;
int len;
for(;nLen>0;nLen-=sndbuf) {
nNeedSnd=nLen>sndbuf?sndbuf:nLen;
len=send(m_sock,buf,nNeedSnd,flags);
if(len==-1) return -1;
buf+=nLen>sndbuf?sndbuf:nLen;
lenSent+=len;
}
连接
int Connect(DWORD ip,int nPort)
{
//判断m_sock是否已经打开.如果是,关闭
m_sock=socket(AF_INET,SOCK_STREAM,0);
if(m_sock==-1) { //返回值应该不是0,1,2. 除非是deamon
return ERR_SOCKET;
}
struct sockaddr_in sa; memset(&sa,0,sizeof(sa)); sa.sin_family=AF_INET; sa.sin_addr.s_addr=ip; sa.sin_port=htons(nPort);
//connect成功返回0,其余-1
if(0!=
connect(m_sock,(struct sockaddr*)&sa,sizeof(sa))) {
closesocket(m_sock);
m_sock=-1;
return ERR_CONNECT;
}
return 0;
}
listen和bind
//使得退出后端口马上可用
int boptval = 1;
setsockopt(m_sock, 1, SO_REUSEADDR, (const char*)&boptval, sizeof(boptval));
struct sockaddr_in sa; memset(&sa,0,sizeof(sa)); sa.sin_family=AF_INET;
//0x01000007f表示localhost
*(u_long*)&sa.sin_addr=bLocal?0x0100007f:(ip?inet_addr(ip):INADDR_ANY);
if(nPort) sa.sin_port=
htons(nPort);
if(bind(m_sock,(struct sockaddr*)&sa,sizeof(sa))) {
closesocket(m_sock);
m_sock=INVALID_SOCKET;
return ERR_SOCKET;
}
struct sockaddr_in name;
socklen_t len=sizeof(name);
getsockname(m_sock,(struct sockaddr*)&name,&len);//取回socket的port ,以确定是否绑定了需要的端口
if(
listen(m_sock,
SOMAXCONN)) {
closesocket(m_sock);
m_sock=INVALID_SOCKET;
return ERR_LISTEN;
}
return ntohs(name.sin_port);
socket是否可读写
int IsReadyRead(SOCKET s,int ms/* =0 */)
{
if(s==-1)
return 0;
struct timeval tv;
fd_set fs;
tv.tv_sec=ms/1000;
tv.tv_usec=(ms00)*1000;
FD_ZERO(&fs);
FD_SET(s,&fs);
if(select(s+1,&fs,0,0,&tv)<=0) {
return 0;
}
return 1;
}
设置nonblock
int flags = fcntl(s, F_GETFL, 0);
fcntl(s, F_SETFL, flags|O_NONBLOCK); //设置
fcntl(s, F_SETFL, flags & ~O_NONBLOCK);//重置
判断ip还是域名并返回s_addr
DWORD InetAddr(const char* host)
{
struct hostent* h=gethostbyname(host);
unsigned long ip=
INADDR_NONE;
//如果是域名
if(h) {
ip=*(unsigned long*)(h->h_addr_list[0]);
}
//如果是ip地址
else if((
ip=inet_addr(host))==INADDR_NONE) {
return ip;
}
return ip;
}
poll用法
struct pollfd pfd[1];
pfd[0].fd=sockfd;
pfd[0].events=
POLLRDNORM;
while(1)
{
switch(poll(pfd,0+1,timeout_second))
{
case -1:
perror("error");
continue;
case 0:
/
/timeout
continue;
default:
{
if(pfd[0].revents&POLLRDNORM)
//accept() and add
}
}
}
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