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-rw-r--r--lib/kernel/doc/src/gen_udp.xml17
1 files changed, 13 insertions, 4 deletions
diff --git a/lib/kernel/doc/src/gen_udp.xml b/lib/kernel/doc/src/gen_udp.xml
index faca31e928..503725fe18 100644
--- a/lib/kernel/doc/src/gen_udp.xml
+++ b/lib/kernel/doc/src/gen_udp.xml
@@ -145,14 +145,23 @@
<seealso marker="inet#setopts/2">inet:setopts/2</seealso>.</p>
</item>
</taglist>
- <p>The returned socket <c><anno>Socket</anno></c> is used to send packets
- from this port with <c>send/4</c>. When UDP packets arrive at
- the opened port, they are delivered as messages:</p>
+ <p>The returned socket <c><anno>Socket</anno></c> is used to send
+ packets from this port with <c>send/4</c>. When UDP packets arrive
+ at the opened port, if the socket is in an active mode the packets
+ are delivered as messages to the controlling process:</p>
<code type="none">
{udp, Socket, IP, InPortNo, Packet}</code>
- <p>Note that arriving UDP packets that are longer than
+ <p>If the socket is not in an active mode, data can be
+ retrieved via the <seealso marker="#recv/2">recv/2,3</seealso> calls.
+ Note that arriving UDP packets that are longer than
the receive buffer option specifies, might be truncated
without warning.</p>
+ <p>When a socket in <c>{active, N}</c> mode (see <seealso marker="inet#setopts/2">
+ inet:setopts/2</seealso> for details) transitions to passive
+ (<c>{active, false}</c>) mode, the controlling process is notified by a
+ message of the following form:</p>
+ <code type="none">
+{udp_passive, Socket}</code>
<p><c>IP</c> and <c>InPortNo</c> define the address from which
<c>Packet</c> came. <c>Packet</c> is a list of bytes if
the option <c>list</c> was specified. <c>Packet</c> is a