NNG_SOCKET(5)

NAME
nng_socket - socket handle

SYNOPSIS

    #include <nng/nng.h>
    typedef struct nng_socket_s nng_socket;

DESCRIPTION

An nng_socket is a handle to an underlying socket object. All communication between the application and remote Scalability Protocol peers is done through sockets. A given socket can have multiple dialers (nng_dialer) and/or listeners (nng_listener), and multiple pipes (nng_pipe), and may be connected to multiple transports at the same time. However, a given socket will have exactly one protocol associated with it, and is responsible for any state machines or other protocol-specific logic.

    Important

    The nng_socket structure is always passed by value (both for input parameters and return values), and should be treated opaquely. Passing structures this way gives the compiler a chance to perform accurate type checks in functions passing values of this type.

Each nng_socket is created by a protocol-specific constructor, such as nng_rep_open(). When the socket is no longer needed, it can be closed with nng_close().

  Initialization

A socket may be initialized using the macro NNG_SOCKET_INITIALIZER before it is opened, to prevent confusion with valid open sockets.

For example:

    nng_socket s = NNG_SOCKET_INITIALIZER;

SEE ALSO

libnng(3), nng_close(3), nng_getopt(3), nng_setopt(3), nng_socket_id(3), nng_dialer(5), nng_listener(5), nng_options(5), nng(7)