'\" t
.\"     Title: zmq_has
.\"    Author: [see the "AUTHORS" section]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 09/06/2020
.\"    Manual: 0MQ Manual
.\"    Source: 0MQ 4.3.1
.\"  Language: English
.\"
.TH "ZMQ_HAS" "3" "09/06/2020" "0MQ 4\&.3\&.1" "0MQ Manual"
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.SH "NAME"
zmq_has \- check a ZMQ capability
.SH "SYNOPSIS"
.sp
\fBint zmq_has (const char *capability);\fR
.SH "DESCRIPTION"
.sp
The \fIzmq_has()\fR 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\&.
.sp
Capabilities shall be lowercase strings\&. The following capabilities are defined:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
ipc \- the library supports the ipc:// protocol
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
pgm \- the library supports the pgm:// protocol
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
tipc \- the library supports the tipc:// protocol
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
norm \- the library supports the norm:// protocol
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
curve \- the library supports the CURVE security mechanism
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
gssapi \- the library supports the GSSAPI security mechanism
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
draft \- the library is built with the draft api
.RE
.sp
When this method is provided, the zmq\&.h header file will define ZMQ_HAS_CAPABILITIES\&.
.SH "RETURN VALUE"
.sp
The \fIzmq_has()\fR function shall return 1 if the specified capability is provided\&. Otherwise it shall return 0\&.
.SH "AUTHORS"
.sp
This page was written by the 0MQ community\&. To make a change please read the 0MQ Contribution Policy at \m[blue]\fBhttp://www\&.zeromq\&.org/docs:contributing\fR\m[]\&.