'\" t
.\"     Title: zmq_close
.\"    Author: [see the "AUTHORS" section]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 01/17/2021
.\"    Manual: 0MQ Manual
.\"    Source: 0MQ 4.3.4
.\"  Language: English
.\"
.TH "ZMQ_CLOSE" "3" "01/17/2021" "0MQ 4\&.3\&.4" "0MQ Manual"
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.SH "NAME"
zmq_close \- close 0MQ socket
.SH "SYNOPSIS"
.sp
\fBint zmq_close (void \fR\fB\fI*socket\fR\fR\fB);\fR
.SH "DESCRIPTION"
.sp
The \fIzmq_close()\fR function shall destroy the socket referenced by the \fIsocket\fR argument\&. Any outstanding messages physically received from the network but not yet received by the application with \fIzmq_recv()\fR shall be discarded\&. The behaviour for discarding messages sent by the application with \fIzmq_send()\fR but not yet physically transferred to the network depends on the value of the \fIZMQ_LINGER\fR socket option for the specified \fIsocket\fR\&.
.sp
\fIzmq_close()\fR must be called exactly once for each socket\&. If it is never called, \fIzmq_ctx_term()\fR will block forever\&. If it is called multiple times for the same socket or if \fIsocket\fR does not point to a socket, the behaviour is undefined\&.
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\fBNote\fR
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The default setting of \fIZMQ_LINGER\fR does not discard unsent messages; this behaviour may cause the application to block when calling \fIzmq_ctx_term()\fR\&. For details refer to \fBzmq_setsockopt\fR(3) and \fBzmq_ctx_term\fR(3)\&.
.sp .5v
.RE
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This API will complete asynchronously, so not everything will be deallocated after it returns\&. See above for details about linger\&.
.sp .5v
.RE
.SH "RETURN VALUE"
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The \fIzmq_close()\fR function shall return zero if successful\&. Otherwise it shall return \-1 and set \fIerrno\fR to one of the values defined below\&.
.SH "ERRORS"
.PP
\fBENOTSOCK\fR
.RS 4
The provided
\fIsocket\fR
was NULL\&.
.RE
.SH "SEE ALSO"
.sp
\fBzmq_socket\fR(3) \fBzmq_ctx_term\fR(3) \fBzmq_setsockopt\fR(3) \fBzmq\fR(7)
.SH "AUTHORS"
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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[]\&.