ZMQ\_HAS(3) 0MQ Manual ZMQ\_HAS(3)

# [NAME](#NAME)

zmq\_has - check a ZMQ capability

# [SYNOPSIS](#SYNOPSIS)

**int zmq\_has (const char \*capability);**

# [DESCRIPTION](#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:

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

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

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

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

• curve - the library supports the CURVE security mechanism

• gssapi - the library supports the GSSAPI security mechanism

• 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](#RETURN_VALUE)

The *zmq\_has()* function shall return 1 if the specified capability is provided. Otherwise it shall return 0.

# [AUTHORS](#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**.

10/24/2026 0MQ 4.3.5

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Document: zmq_has(3) from zeromq 4.3.5-r14 (Chainguard OS)
Source: https://github.com/zeromq/libzmq