# FBB::LocalClientSocket(3bobcat)

## Unix Domain client Socket
(libbobcat-dev_6.07.01)

## 2005-2025

## NAME

FBB::LocalClientSocket - Client Socket connecting to a Server in the Unix Domain

## SYNOPSIS

#include <bobcat/localclientsocket>
Linking option: -lbobcat

## DESCRIPTION

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 available 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::Exception 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.

Copy and move constructors (and assignment operators) are not available.

## MEMBER FUNCTION

- int connect():
  This member returns a socket that can be used to communicate with the server process. An FBB::Exception 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::Exception 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;
            }
        }
        catch (Exception 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

## SEE ALSO

bobcat(7), ifdstream(3bobcat), ifdbuf(3bobcat), clientsocket(3bobcat), localserversocket(3bobcat), localsocketbase(3bobcat), ofdstream(3bobcat), ofdstream(3bobcat)

## BUGS

None Reported.

## BOBCAT PROJECT FILES

- https://fbb-git.gitlab.io/bobcat/: gitlab project page;

Debian Bobcat project files:

- libbobcat6: debian package containing the shared library, changelog and copyright note;
- libbobcat-dev: debian package containing the static library, headers, manual pages, and developer info;

## BOBCAT

Bobcat is an acronym of `Brokken's Own Base Classes And Templates'.

## COPYRIGHT

This is free software, distributed under the terms of the GNU General Public License (GPL).

## AUTHOR

Frank B. Brokken (f.b.brokken@rug.nl).