SYNOPSIS
#include <nng/nng.h>
int nng_close(nng_socket s);DESCRIPTION
The nng_close() function closes the supplied socket, s. Messages
that have been submitted for sending may be flushed or delivered,
depending upon the transport and the setting of the NNG_OPT_LINGER
option.
Further attempts to use the socket after this call returns will result
in NNG_EBADF. Threads waiting for operations on the socket when this
call is executed may also return with an NNG_EBADF result.
RETURN VALUES
This function returns 0 on success, and non-zero otherwise.
ERRORS
NNG_EBADF-
The socket s is already closed or was never opened.