An FBB::LocalClientSocket may be constructed to connect to a server
process in the Unix Domain. The socket made available by the
FBB:LocalClientSocket may be used to initialize a std::istream and/or
std::ostream. The std::istream is used to read information from the
server process to which the FBB::LocalClientSocket connects, The
std::ostream is used to send information to the server process to which
the FBB::LocalClientSocket connects. Since a socket may be considered a
file descriptor the avaiable FBB::IFdStream, FBB::IFdStreamBuf,
FBB::OFdStream, and FBB::OFdStreamBuf classes may be used profitably
here. Note that having available a socket does not mean that this defines the
communication protocol. It is (still) the responsibility of the programmer to
comply with an existing protocol or to implement a tailor-made protocol. The
latter situation implies that the sequence of input- and output operations is
defined by the programmer.
NAMESPACE
FBB
All constructors, members, operators and manipulators, mentioned in this
man-page, are defined in the namespace FBB.
INHERITS FROM
FBB::LocalSocketBase
CONSTRUCTOR
LocalClientSocket():
This constructor merely creates a FBB::LocalClientSocket
object. Before it can be used, its open() member must be called.
LocalClientSocket(std::string const &name):
This constructor initializes an FBB::LocalClientSocket object,
using the named Unix Domain socket to connect to the server using the named
Unix Domain socket. An FBB::Errno is thrown if the socket could not be
constructed. The construction of the socket does not mean that a connection
has actually been established. In order to connect to the server, the member
connect() (see below) should be used.
The copy constructor is not available.
MEMBER FUNCTION
int connect():
This member returns a socket that can be used to communicate with the
server process. An FBB::Errno exception is thrown if the connection could
not be established.
open(std::string const &name):
This member function prepares the FBB::LocalClientSocket object,
constructed earlier using the default constructor, for use. The named Unix
Domain socket is used to connect to the server using the named Unix Domain
socket. An FBB::Errno is thrown if the socket could not be
constructed. The construction of the socket does not mean that a connection
has actually been established. In order to connect to the server, the member
connect() should be used.
EXAMPLE
See also the localserversocket(3bobcat) example.
#include <iostream>
#include <bobcat/localclientsocket>
#include <bobcat/ifdstream>
#include <bobcat/ofdstream>
using namespace std;
using namespace FBB;
int main(int argc, char **argv)
try
{
if (argc == 1)
{
cerr << "Provide filename representing the unix domain socket\n";
return 1;
}
LocalClientSocket client(argv[1]);
int fd = client.connect();
string line;
cout << "Connecting to socket " << fd << endl;
IFdStream in(fd); // stream to read from
OFdStream out(fd); // stream to write to
while (true)
{
// Ask for a textline, stop if empty / none
cout << "? ";
if (!getline(cin, line) || line.length() == 0)
return 0;
cout << "Line read: " << line << endl;
// Return the line to the server
out << line.c_str() << endl;
cout << "wrote line\n";
// Wait for a reply from the server
getline(in, line);
cout << "Answer: " << line << endl;
}
return 0;
}
catch (Errno const &err)
{
cerr << err.what() << "\n" <<
"Can't connect to " << argv[1] << ", port " << argv[2] << endl;
return 1;
}
FILES
bobcat/localclientsocket - defines the class interface