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-'\" t
-.\" Title: zmq_sendmsg
-.\" Author: [see the "AUTHORS" section]
-.\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
-.\" Date: 03/10/2014
-.\" Manual: 0MQ Manual
-.\" Source: 0MQ 4.0.1
-.\" Language: English
-.\"
-.TH "ZMQ_SENDMSG" "3" "03/10/2014" "0MQ 4\&.0\&.1" "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_sendmsg \- send a message part on a socket
-.SH "SYNOPSIS"
-.sp
-\fBint zmq_sendmsg (void \fR\fB\fI*socket\fR\fR\fB, zmq_msg_t \fR\fB\fI*msg\fR\fR\fB, int \fR\fB\fIflags\fR\fR\fB);\fR
-.SH "DESCRIPTION"
-.sp
-The \fIzmq_sendmsg()\fR function shall queue the message referenced by the \fImsg\fR argument to be sent to the socket referenced by the \fIsocket\fR argument\&. The \fIflags\fR argument is a combination of the flags defined below:
-.PP
-\fBZMQ_DONTWAIT\fR
-.RS 4
-For socket types (DEALER, PUSH) that block when there are no available peers (or all peers have full high\-water mark), specifies that the operation should be performed in non\-blocking mode\&. If the message cannot be queued on the
-\fIsocket\fR, the
-\fIzmq_sendmsg()\fR
-function shall fail with
-\fIerrno\fR
-set to EAGAIN\&.
-.RE
-.PP
-\fBZMQ_SNDMORE\fR
-.RS 4
-Specifies that the message being sent is a multi\-part message, and that further message parts are to follow\&. Refer to the section regarding multi\-part messages below for a detailed description\&.
-.RE
-.sp
-The \fIzmq_msg_t\fR structure passed to \fIzmq_sendmsg()\fR is nullified during the call\&. If you want to send the same message to multiple sockets you have to copy it using (e\&.g\&. using \fIzmq_msg_copy()\fR)\&.
-.if n \{\
-.sp
-.\}
-.RS 4
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBNote\fR
-.ps -1
-.br
-.sp
-A successful invocation of \fIzmq_sendmsg()\fR does not indicate that the message has been transmitted to the network, only that it has been queued on the \fIsocket\fR and 0MQ has assumed responsibility for the message\&.
-.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
-\fBNote\fR
-.ps -1
-.br
-.sp
-this API method is deprecated in favor of zmq_msg_send(3)\&.
-.sp .5v
-.RE
-.SS "Multi\-part messages"
-.sp
-A 0MQ message is composed of 1 or more message parts\&. Each message part is an independent \fIzmq_msg_t\fR in its own right\&. 0MQ ensures atomic delivery of messages: peers shall receive either all \fImessage parts\fR of a message or none at all\&. The total number of message parts is unlimited except by available memory\&.
-.sp
-An application that sends multi\-part messages must use the \fIZMQ_SNDMORE\fR flag when sending each message part except the final one\&.
-.SH "RETURN VALUE"
-.sp
-The \fIzmq_sendmsg()\fR function shall return number of bytes in the message if successful\&. Otherwise it shall return \-1 and set \fIerrno\fR to one of the values defined below\&.
-.SH "ERRORS"
-.PP
-\fBEAGAIN\fR
-.RS 4
-Non\-blocking mode was requested and the message cannot be sent at the moment\&.
-.RE
-.PP
-\fBENOTSUP\fR
-.RS 4
-The
-\fIzmq_sendmsg()\fR
-operation is not supported by this socket type\&.
-.RE
-.PP
-\fBEFSM\fR
-.RS 4
-The
-\fIzmq_sendmsg()\fR
-operation cannot be performed on this socket at the moment due to the socket not being in the appropriate state\&. This error may occur with socket types that switch between several states, such as ZMQ_REP\&. See the
-\fImessaging patterns\fR
-section of
-\fBzmq_socket\fR(3)
-for more information\&.
-.RE
-.PP
-\fBETERM\fR
-.RS 4
-The 0MQ
-\fIcontext\fR
-associated with the specified
-\fIsocket\fR
-was terminated\&.
-.RE
-.PP
-\fBENOTSOCK\fR
-.RS 4
-The provided
-\fIsocket\fR
-was invalid\&.
-.RE
-.PP
-\fBEINTR\fR
-.RS 4
-The operation was interrupted by delivery of a signal before the message was sent\&.
-.RE
-.PP
-\fBEFAULT\fR
-.RS 4
-Invalid message\&.
-.RE
-.PP
-\fBEHOSTUNREACH\fR
-.RS 4
-The message cannot be routed\&.
-.RE
-.SH "EXAMPLE"
-.PP
-\fBFilling in a message and sending it to a socket\fR.
-.sp
-.if n \{\
-.RS 4
-.\}
-.nf
-/* Create a new message, allocating 6 bytes for message content */
-zmq_msg_t msg;
-int rc = zmq_msg_init_size (&msg, 6);
-assert (rc == 0);
-/* Fill in message content with \*(AqAAAAAA\*(Aq */
-memset (zmq_msg_data (&msg), \*(AqA\*(Aq, 6);
-/* Send the message to the socket */
-rc = zmq_sendmsg (socket, &msg, 0);
-assert (rc == 6);
-.fi
-.if n \{\
-.RE
-.\}
-.PP
-\fBSending a multi-part message\fR.
-.sp
-.if n \{\
-.RS 4
-.\}
-.nf
-/* Send a multi\-part message consisting of three parts to socket */
-rc = zmq_sendmsg (socket, &part1, ZMQ_SNDMORE);
-rc = zmq_sendmsg (socket, &part2, ZMQ_SNDMORE);
-/* Final part; no more parts to follow */
-rc = zmq_sendmsg (socket, &part3, 0);
-.fi
-.if n \{\
-.RE
-.\}
-.sp
-.SH "SEE ALSO"
-.sp
-\fBzmq_recv\fR(3) \fBzmq_socket\fR(7) \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[]\&.