Socket programming basics-socket options

In some cases, we need to further control the socket behavior and attributes, such as modifying the buffer size and viewing the socket status. Therefore, we need to set/obtain the socket options.

1. Obtain socket options
int getsockopt(SOCKET s,int level,int optname,void *optval,int *optlen)
s: Socket Descriptor
level: Option level, includingSOL_SOCKETAndIPPROTO_TCP
optname: Socket option name
optval: Buffer Used to receive socket values
optlen: Buffer size

For example:

int optVal;int optLen=sizeof(optVal);// getsocketoptgetsockopt(ListenSocket,SOL_SOCKET,SO_ACCEPTCONN,(char*)&optVal,&optLen);cout<<"SO_ACCEPTCONN:"<<optVal<<endl;

2. Set socket options
int setsockopt(SOCKET s,int level,int optname,void *optval,int optlen)
s: Socket Descriptor
level: Option level, includingSOL_SOCKETAndIPPROTO_TCP
optname: Socket option name
optval: Buffer used to set the socket Value
optlen: Buffer size

For example:

Bool bopt = true; int boptlen = sizeof (bopt); // getsockopt (listensocket, sol_socket, so_keepalive, (char *) & optval, & optlen) before modification ); cout <"so_keepalive:" <optval <Endl; // setsockoptsetsockopt (listensocket, sol_socket, so_keepalive, (char *) & bopt, boptlen ); // getsockopt (listensocket, sol_socket, so_keepalive, (char *) & optval, & optlen); cout <"so_keepalive:" <optval <Endl;

Socket programming basics-socket options