SYNOPSIS
#include <nng/nng.h>
int nng_socket_id(nng_socket s);DESCRIPTION
The nng_socket_id() function returns a positive identifier for the socket s,
if it is valid.
Otherwise it returns -1.
A socket is considered valid if it was ever opened with a protocol
constructor, such as the nng_req0_open() function.
Sockets that are allocated on the stack or statically should be
initialized with the macro
NNG_SOCKET_INITIALIZER to ensure that
they cannot be confused with a valid socket before they are opened.
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RETURN VALUES
This function returns the positive value for the socket identifier, or
-1 if the socket is invalid.
ERRORS
None.