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94 lines
3.2 KiB
94 lines
3.2 KiB
5 years ago
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'\" t
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.\" Title: zmq_msg_gets
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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_GETS" "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_gets \- get message metadata property
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.SH "SYNOPSIS"
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.sp
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\fBconst char *zmq_msg_gets (zmq_msg_t \fR\fB\fI*message\fR\fR\fB, const char *\fR\fB\fIproperty\fR\fR\fB);\fR
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.SH "DESCRIPTION"
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.sp
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The \fIzmq_msg_gets()\fR function shall return the string value for the metadata property specified by the \fIproperty\fR argument for the message pointed to by the \fImessage\fR argument\&. Both the \fIproperty\fR argument and the \fIvalue\fR shall be NULL\-terminated UTF8\-encoded strings\&.
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.sp
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Metadata is defined on a per\-connection basis during the ZeroMQ connection handshake as specified in <rfc\&.zeromq\&.org/spec:37>\&.
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.sp
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The following ZMTP properties can be retrieved with the \fIzmq_msg_gets()\fR function:
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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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Socket\-Type
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Identity
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Resource
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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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Additionally, when available for the underlying transport, the \fBPeer\-Address\fR property will return the IP address of the remote endpoint as returned by getnameinfo(2)\&.
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.sp
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Other properties may be defined based on the underlying security mechanism, see ZAP authenticated connection sample below\&.
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.SH "RETURN VALUE"
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.sp
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The \fIzmq_msg_gets()\fR function shall return the string value for the property if successful\&. Otherwise it shall return NULL and set \fIerrno\fR to one of the values defined below\&. The caller shall not modify or free the returned value, which shall be owned by the message\&. The encoding of the property and value shall be UTF8\&.
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.SH "ERRORS"
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.PP
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\fBEINVAL\fR
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.RS 4
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The requested
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\fIproperty\fR
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is unknown\&.
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.RE
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.SH "EXAMPLE"
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.PP
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\fBGetting the ZAP authenticated user id for 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 (&msg);
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rc = zmq_msg_recv (&msg, dealer, 0);
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assert (rc != \-1);
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const char *user_id = zmq_msg_gets (&msg, "User\-Id");
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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\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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