ZMQ_HAS(3)                        0MQ Manual                        ZMQ_HAS(3)

NAME
       zmq_has - check a ZMQ capability

SYNOPSIS
       int zmq_has (const char *capability);

DESCRIPTION
       The zmq_has() function shall report whether a specified capability is
       available in the library. This allows bindings and applications to
       probe a library directly, for transport and security options.

       Capabilities shall be lowercase strings. The following capabilities are
       defined:

       o   ipc - the library supports the ipc:// protocol

       o   pgm - the library supports the pgm:// protocol

       o   tipc - the library supports the tipc:// protocol

       o   norm - the library supports the norm:// protocol

       o   curve - the library supports the CURVE security mechanism

       o   gssapi - the library supports the GSSAPI security mechanism

       o   draft - the library is built with the draft api

       When this method is provided, the zmq.h header file will define
       ZMQ_HAS_CAPABILITIES.

RETURN VALUE
       The zmq_has() function shall return 1 if the specified capability is
       provided. Otherwise it shall return 0.

AUTHORS
       This page was written by the 0MQ community. To make a change please
       read the 0MQ Contribution Policy at
       http://www.zeromq.org/docs:contributing.

0MQ 4.3.5                         02/15/2026                        ZMQ_HAS(3)