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106 lines
3.3 KiB
106 lines
3.3 KiB
'\" t
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.\" Title: zmq_msg_copy
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.\" Author: [see the "AUTHORS" section]
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.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
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.\" Date: 09/14/2016
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.\" Manual: 0MQ Manual
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.\" Source: 0MQ 4.1.5
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.\" Language: English
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.\"
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.TH "ZMQ_MSG_COPY" "3" "09/14/2016" "0MQ 4\&.1\&.5" "0MQ Manual"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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zmq_msg_copy \- copy content of a message to another message
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.SH "SYNOPSIS"
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.sp
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\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
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.SH "DESCRIPTION"
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.sp
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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\&.
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.if n \{\
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.sp
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.\}
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.RS 4
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.it 1 an-trap
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.nr an-no-space-flag 1
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.nr an-break-flag 1
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.br
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.ps +1
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\fBCaution\fR
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.ps -1
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.br
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.sp
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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\&.
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.sp .5v
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.RE
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.if n \{\
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.sp
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.\}
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.RS 4
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.it 1 an-trap
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.nr an-no-space-flag 1
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.nr an-break-flag 1
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.br
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.ps +1
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\fBCaution\fR
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.ps -1
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.br
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.sp
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Never access \fIzmq_msg_t\fR members directly, instead always use the \fIzmq_msg\fR family of functions\&.
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.sp .5v
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.RE
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.SH "RETURN VALUE"
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.sp
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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\&.
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.SH "ERRORS"
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.PP
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\fBEFAULT\fR
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.RS 4
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Invalid message\&.
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.RE
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.SH "EXAMPLE"
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.PP
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\fBCopying a message\fR.
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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zmq_msg_t msg;
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zmq_msg_init_size (&msg, 255);
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memcpy (zmq_msg_data (&msg, "Hello, World", 12);
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zmq_msg_t copy;
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zmq_msg_init (©);
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zmq_msg_copy (©, &msg);
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\&.\&.\&.
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zmq_msg_close (©);
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zmq_msg_close (&msg);
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.SH "SEE ALSO"
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.sp
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\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)
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.SH "AUTHORS"
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.sp
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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[]\&.
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