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+.TH zmq_send 3 "" "(c)2007-2009 FastMQ Inc." "0MQ User Manuals"
+.SH NAME
+zmq_send \- sends a message
+.SH SYNOPSIS
+.B int zmq_send (void *s, zmq_msg_t *msg, int flags);
+.SH DESCRIPTION
+Send the message
+.IR msg
+to the socket
+.IR s .
+.IR flags
+argument can be combination the flags described below.
+
+.IP "\fBZMQ_NOBLOCK\fP"
+The flag specifies that the operation should be performed in
+non-blocking mode. I.e. if it cannot be processed immediately,
+error should be returned with
+.IR errno
+set to EAGAIN.
+
+.IP "\fBZMQ_NOFLUSH\fP"
+The flag specifies that
+.IR zmq_send
+should not flush the message downstream immediately. Instead, it should batch
+ZMQ_NOFLUSH messages and send them downstream only once
+.IR zmq_flush
+is invoked. This is an optimisation for cases where several messages are sent
+in a single business transaction. However, the effect is measurable only in
+extremely high-perf scenarios (million messages a second or so).
+If that's not your case, use standard flushing send instead.
+
+.SH RETURN VALUE
+In case of success the function returns zero. Otherwise it returns -1 and
+sets
+.IR errno
+to the appropriate value.
+.SH ERRORS
+.IP "\fBEAGAIN\fP"
+it's a non-blocking send and message cannot be sent at the moment.
+.IP "\fBENOTSUP\fP"
+function isn't supported by particular socket type.
+.IP "\fBEFSM\fP"
+function cannot be called at the moment, because socket is not in the
+approprite state. This error may occur with sockets that switch between
+several states (e.g. ZMQ_REQ).
+.SH EXAMPLE
+.nf
+zmq_msg_t msg;
+int rc = zmq_msg_init_size (&msg, 6);
+assert (rc == 0);
+memset (zmq_msg_data (&msg), 'A', 6);
+rc = zmq_send (s, &msg, 0);
+assert (rc == 0);
+.fi
+.SH SEE ALSO
+.BR zmq_flush (3)
+.BR zmq_recv (3)
+.BR zmq_msg_init (3)
+.BR zmq_msg_init_size (3)
+.BR zmq_msg_init_data (3)
+.BR zmq_msg_data (3)
+.BR zmq_msg_size (3)
+.SH AUTHOR
+Martin Sustrik <sustrik at 250bpm dot com>