diff options
Diffstat (limited to 'doc/zmq_sendmsg.3')
| -rw-r--r-- | doc/zmq_sendmsg.3 | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/doc/zmq_sendmsg.3 b/doc/zmq_sendmsg.3 new file mode 100644 index 0000000..f8e2e0d --- /dev/null +++ b/doc/zmq_sendmsg.3 @@ -0,0 +1,204 @@ +'\" t +.\" Title: zmq_sendmsg +.\" Author: [see the "AUTHORS" section] +.\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/> +.\" Date: 11/23/2012 +.\" Manual: 0MQ Manual +.\" Source: 0MQ 3.2.2 +.\" Language: English +.\" +.TH "ZMQ_SENDMSG" "3" "11/23/2012" "0MQ 3\&.2\&.2" "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 +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 +.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_recv\fR(3) \fBzmq_recvmsg\fR(3) \fBzmq_socket\fR(7) \fBzmq\fR(7) +.SH "AUTHORS" +.sp +This 0MQ manual page was written by Martin Sustrik <\m[blue]\fBsustrik@250bpm\&.com\fR\m[]\&\s-2\u[1]\d\s+2> and Martin Lucina <\m[blue]\fBmato@kotelna\&.sk\fR\m[]\&\s-2\u[2]\d\s+2>, and Pieter Hintjens <\m[blue]\fBph@imatix\&.com\fR\m[]\&\s-2\u[3]\d\s+2>\&. +.SH "NOTES" +.IP " 1." 4 +sustrik@250bpm.com +.RS 4 +\%mailto:sustrik@250bpm.com +.RE +.IP " 2." 4 +mato@kotelna.sk +.RS 4 +\%mailto:mato@kotelna.sk +.RE +.IP " 3." 4 +ph@imatix.com +.RS 4 +\%mailto:ph@imatix.com +.RE |