You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
107 lines
3.3 KiB
107 lines
3.3 KiB
6 years ago
|
'\" t
|
||
|
|
.\" Title: zmq_msg_copy
|
||
|
|
.\" Author: [see the "AUTHORS" section]
|
||
|
|
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
|
||
|
|
.\" Date: 09/14/2016
|
||
|
|
.\" Manual: 0MQ Manual
|
||
|
|
.\" Source: 0MQ 4.1.5
|
||
|
|
.\" Language: English
|
||
|
|
.\"
|
||
|
|
.TH "ZMQ_MSG_COPY" "3" "09/14/2016" "0MQ 4\&.1\&.5" "0MQ Manual"
|
||
|
|
.\" -----------------------------------------------------------------
|
||
|
|
.\" * Define some portability stuff
|
||
|
|
.\" -----------------------------------------------------------------
|
||
|
|
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||
|
|
.\" http://bugs.debian.org/507673
|
||
|
|
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
|
||
|
|
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||
|
|
.ie \n(.g .ds Aq \(aq
|
||
|
|
.el .ds Aq '
|
||
|
|
.\" -----------------------------------------------------------------
|
||
|
|
.\" * set default formatting
|
||
|
|
.\" -----------------------------------------------------------------
|
||
|
|
.\" disable hyphenation
|
||
|
|
.nh
|
||
|
|
.\" disable justification (adjust text to left margin only)
|
||
|
|
.ad l
|
||
|
|
.\" -----------------------------------------------------------------
|
||
|
|
.\" * MAIN CONTENT STARTS HERE *
|
||
|
|
.\" -----------------------------------------------------------------
|
||
|
|
.SH "NAME"
|
||
|
|
zmq_msg_copy \- copy content of a message to another message
|
||
|
|
.SH "SYNOPSIS"
|
||
|
|
.sp
|
||
|
|
\fBint zmq_msg_copy (zmq_msg_t \fR\fB\fI*dest\fR\fR\fB, zmq_msg_t \fR\fB\fI*src\fR\fR\fB);\fR
|
||
|
|
.SH "DESCRIPTION"
|
||
|
|
.sp
|
||
|
|
The \fIzmq_msg_copy()\fR function shall copy the message object referenced by \fIsrc\fR to the message object referenced by \fIdest\fR\&. The original content of \fIdest\fR, if any, shall be released\&. You must initialize \fIdest\fR before copying to it\&.
|
||
|
|
.if n \{\
|
||
|
|
.sp
|
||
|
|
.\}
|
||
|
|
.RS 4
|
||
|
|
.it 1 an-trap
|
||
|
|
.nr an-no-space-flag 1
|
||
|
|
.nr an-break-flag 1
|
||
|
|
.br
|
||
|
|
.ps +1
|
||
|
|
\fBCaution\fR
|
||
|
|
.ps -1
|
||
|
|
.br
|
||
|
|
.sp
|
||
|
|
The implementation may choose not to physically copy the message content, rather to share the underlying buffer between \fIsrc\fR and \fIdest\fR\&. Avoid modifying message content after a message has been copied with \fIzmq_msg_copy()\fR, doing so can result in undefined behaviour\&. If what you need is an actual hard copy, allocate a new message using \fIzmq_msg_init_size()\fR and copy the message content using \fImemcpy()\fR\&.
|
||
|
|
.sp .5v
|
||
|
|
.RE
|
||
|
|
.if n \{\
|
||
|
|
.sp
|
||
|
|
.\}
|
||
|
|
.RS 4
|
||
|
|
.it 1 an-trap
|
||
|
|
.nr an-no-space-flag 1
|
||
|
|
.nr an-break-flag 1
|
||
|
|
.br
|
||
|
|
.ps +1
|
||
|
|
\fBCaution\fR
|
||
|
|
.ps -1
|
||
|
|
.br
|
||
|
|
.sp
|
||
|
|
Never access \fIzmq_msg_t\fR members directly, instead always use the \fIzmq_msg\fR family of functions\&.
|
||
|
|
.sp .5v
|
||
|
|
.RE
|
||
|
|
.SH "RETURN VALUE"
|
||
|
|
.sp
|
||
|
|
The \fIzmq_msg_copy()\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
|
||
|
|
\fBEFAULT\fR
|
||
|
|
.RS 4
|
||
|
|
Invalid message\&.
|
||
|
|
.RE
|
||
|
|
.SH "EXAMPLE"
|
||
|
|
.PP
|
||
|
|
\fBCopying a message\fR.
|
||
|
|
.sp
|
||
|
|
.if n \{\
|
||
|
|
.RS 4
|
||
|
|
.\}
|
||
|
|
.nf
|
||
|
|
zmq_msg_t msg;
|
||
|
|
zmq_msg_init_size (&msg, 255);
|
||
|
|
memcpy (zmq_msg_data (&msg, "Hello, World", 12);
|
||
|
|
zmq_msg_t copy;
|
||
|
|
zmq_msg_init (©);
|
||
|
|
zmq_msg_copy (©, &msg);
|
||
|
|
\&.\&.\&.
|
||
|
|
zmq_msg_close (©);
|
||
|
|
zmq_msg_close (&msg);
|
||
|
|
.fi
|
||
|
|
.if n \{\
|
||
|
|
.RE
|
||
|
|
.\}
|
||
|
|
.sp
|
||
|
|
.SH "SEE ALSO"
|
||
|
|
.sp
|
||
|
|
\fBzmq_msg_move\fR(3) \fBzmq_msg_init\fR(3) \fBzmq_msg_init_size\fR(3) \fBzmq_msg_init_data\fR(3) \fBzmq_msg_close\fR(3) \fBzmq\fR(7)
|
||
|
|
.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[]\&.
|