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| </head> |
| <body class="manpage"> |
| <div id="header"> |
| <h1>nn_recvmsg(3) Manual Page</h1> |
| <h2>NAME</h2> |
| <div class="sectionbody"> |
| <p>nn_recvmsg - fine-grained alternative to nn_recv</p> |
| </div> |
| </div> |
| <div id="content"> |
| <div class="sect1"> |
| <h2 id="_synopsis">SYNOPSIS</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><strong>#include <nanomsg/nn.h></strong></p> |
| </div> |
| <div class="paragraph"> |
| <p><strong>NN_EXPORT int nn_recvmsg (int <em>s</em>, struct nn_msghdr <em>*msghdr</em>, int <em>flags</em>);</strong></p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_description">DESCRIPTION</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Receives a message from socket <em>s</em> into buffers specified by <em>msghdr</em> parameter |
| along with any additional control data. <em>msghdr</em> parameter should be nullified |
| before being used.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Structure <em>nn_msghdr</em> contains at least following members:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>struct nn_iovec *msg_iov; |
| int msg_iovlen; |
| void *msg_control; |
| size_t msg_controllen;</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p><em>msg_iov</em> points to a gather array of buffers to fill in. <em>msg_iovlen</em> specifies |
| the size of the array.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>msg_control</em> points to the buffer to hold control information associated with |
| the received message. <em>msg_controllen</em> specifies the length of the buffer. |
| If the control information should not be retrieved, set <em>msg_control</em> parameter |
| to NULL. For detailed discussion of how to parse the control information check |
| <a href="nn_cmsg.html">nn_cmsg(3)</a> man page.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Structure <em>nn_iovec</em> defines one element in the gather array (a buffer to be |
| filled in by message data) and contains following members:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>void *iov_base; |
| size_t iov_len;</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Alternatively, <em>nanomsg</em> library can allocate the buffer for you. To do so, |
| let the <em>iov_base</em> point to void* variable to receive the buffer and set |
| <em>iov_len</em> to <em>NN_MSG</em>. After successful completion user is responsible |
| for deallocating the message using <a href="nn_freemsg.html">nn_freemsg(3)</a> function. Gather |
| array in <em>nn_msghdr</em> structure can contain only one element in this case.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The <em>flags</em> argument is a combination of the flags defined below:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>NN_DONTWAIT</strong></dt> |
| <dd> |
| <p>Specifies that the operation should be performed in non-blocking mode. If the |
| message cannot be received straight away, the function will fail with <em>errno</em> |
| set to EAGAIN.</p> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_return_value">RETURN VALUE</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>If the function succeeds number of bytes in the message is returned. Otherwise, |
| -1 is returned and <em>errno</em> is set to to one of the values defined |
| below.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_errors">ERRORS</h2> |
| <div class="sectionbody"> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>EBADF</strong></dt> |
| <dd> |
| <p>The provided socket is invalid.</p> |
| </dd> |
| <dt class="hdlist1"><strong>ENOTSUP</strong></dt> |
| <dd> |
| <p>The operation is not supported by this socket type.</p> |
| </dd> |
| <dt class="hdlist1"><strong>EFSM</strong></dt> |
| <dd> |
| <p>The operation cannot be performed on this socket at the moment because socket is |
| not in the appropriate state. This error may occur with socket types that |
| switch between several states.</p> |
| </dd> |
| <dt class="hdlist1"><strong>EAGAIN</strong></dt> |
| <dd> |
| <p>Non-blocking mode was requested and there’s no message to receive at the moment.</p> |
| </dd> |
| <dt class="hdlist1"><strong>EINTR</strong></dt> |
| <dd> |
| <p>The operation was interrupted by delivery of a signal before the message was |
| received.</p> |
| </dd> |
| <dt class="hdlist1"><strong>ETIMEDOUT</strong></dt> |
| <dd> |
| <p>Individual socket types may define their own specific timeouts. If such timeout |
| is hit this error will be returned.</p> |
| </dd> |
| <dt class="hdlist1"><strong>ETERM</strong></dt> |
| <dd> |
| <p>The library is terminating.</p> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_example">EXAMPLE</h2> |
| <div class="sectionbody"> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>struct nn_msghdr hdr; |
| struct nn_iovec iov [2]; |
| char buf0 [4]; |
| char buf1 [2]; |
| iov [0].iov_base = buf0; |
| iov [0].iov_len = sizeof (buf0); |
| iov [1].iov_base = buf1; |
| iov [1].iov_len = sizeof (buf1); |
| memset (&hdr, 0, sizeof (hdr)); |
| hdr.msg_iov = iov; |
| hdr.msg_iovlen = 2; |
| nn_recvmsg (s, &hdr, 0);</pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_see_also">SEE ALSO</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><a href="nn_recv.html">nn_recv(3)</a> |
| <a href="nn_sendmsg.html">nn_sendmsg(3)</a> |
| <a href="nn_allocmsg.html">nn_allocmsg(3)</a> |
| <a href="nn_freemsg.html">nn_freemsg(3)</a> |
| <a href="nn_cmsg.html">nn_cmsg(3)</a> |
| <a href="nanomsg.html">nanomsg(7)</a></p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_authors">AUTHORS</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><a href="mailto:sustrik@250bpm.com">Martin Sustrik</a></p> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div id="footer"> |
| <div id="footer-text"> |
| nanomsg 1.1.0<br> |
| Last updated 2017-10-18 01:31:20 UTC |
| </div> |
| </div> |
| </body> |
| </html> |
