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man: document that shutdown() is only sometimes OK on sockets passed in via socket activation

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Lennart Poettering 2013-06-20 23:25:23 +02:00
parent 97d0e5f83b
commit 3c86d34cf1
1 changed files with 17 additions and 10 deletions
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27
man/systemd.socket.xml
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@ -374,23 +374,30 @@
and only one service unit is spawned
for all connections (also see
above). This value is ignored for
datagram sockets and FIFOs where
a single service unit unconditionally
datagram sockets and FIFOs where a
single service unit unconditionally
handles all incoming traffic. Defaults
to <option>false</option>. For
performance reasons, it is recommended
to write new daemons only in a way
that is suitable for
<option>Accept=false</option>. A daemon
listening on an AF_UNIX socket may, but does not need to, call
<option>Accept=false</option>. A
daemon listening on an AF_UNIX socket
may, but does not need to, call
<citerefentry><refentrytitle>close</refentrytitle><manvolnum>2</manvolnum></citerefentry>
or
on the received socket before
exiting. However, it must not unlink
the socket from a filesystem. It
should note invoke
<citerefentry><refentrytitle>shutdown</refentrytitle><manvolnum>2</manvolnum></citerefentry>
on the received socket before exiting. However,
it must not unlink the socket from a
filesystem. This option is mostly useful
to allow daemons designed for usage with
<citerefentry><refentrytitle>inetd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
on sockets it got with
<varname>Accept=false</varname>, but
it may do so for sockets it got with
<varname>Accept=true</varname> set.
Setting <varname>Accept=true</varname>
is mostly useful to allow daemons
designed for usage with
<citerefentry><refentrytitle>inetd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
to work unmodified with systemd socket
activation.</para></listitem>
</varlistentry>