SYNOPSIS
#include <nng/nng.h>
int nng_pipe_id(nng_pipe p);DESCRIPTION
The nng_pipe_id() function returns a positive identifier for the pipe p,
if it is valid.
Otherwise it returns -1.
A pipe is considered valid if it was ever created by the socket.
Pipes that are allocated on the stack or statically should be
initialized with the macro
NNG_PIPE_INITIALIZER to ensure that
they cannot be confused with a valid pipe.
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RETURN VALUES
This function returns the positive value for the pipe identifier, or
-1 if the pipe is invalid.
ERRORS
None.