nng_pipe_id3
Return numeric pipe identifier
Usage
#include <nng/nng.h> int nng_pipe_id(nng_pipe p);
Overview
The nng_pipe_id() function returns a positive identifier for the pipe p, if it is valid. Otherwise it returns -1.
Note
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.
Return values
This function returns the positive value for the pipe identifier, or -1 if the pipe is invalid.
Errors
None.