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service: say explicitly that people should not use different NonBlocking= settings if they share socket units between multiple service units

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Fixes: #29600
This commit is contained in:
Lennart Poettering 2023-11-08 11:35:35 +01:00
parent 244101876c
commit 28562194c4
1 changed files with 18 additions and 7 deletions
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25
man/systemd.service.xml
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@ -1064,14 +1064,25 @@
<varlistentry>
<term><varname>NonBlocking=</varname></term>
<listitem><para>Set the <constant>O_NONBLOCK</constant> flag for all file descriptors passed via socket-based
activation. If true, all file descriptors >= 3 (i.e. all except stdin, stdout, stderr), excluding those passed
in via the file descriptor storage logic (see <varname>FileDescriptorStoreMax=</varname> for details), will
have the <constant>O_NONBLOCK</constant> flag set and hence are in non-blocking mode. This option is only
<listitem><para>Set the <constant>O_NONBLOCK</constant> flag for all file descriptors passed via
socket-based activation. If true, all file descriptors >= 3 (i.e. all except stdin, stdout, stderr),
excluding those passed in via the file descriptor storage logic (see
<varname>FileDescriptorStoreMax=</varname> for details), will have the
<constant>O_NONBLOCK</constant> flag set and hence are in non-blocking mode. This option is only
useful in conjunction with a socket unit, as described in
<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry> and has no
effect on file descriptors which were previously saved in the file-descriptor store for example. Defaults to
false.</para></listitem>
<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>
and has no effect on file descriptors which were previously saved in the file-descriptor store for
example. Defaults to false.</para>
<para>Note that if the same socket unit is configured to be passed to multiple service units (via the
<varname>Sockets=</varname> setting, see below), and these services have different
<varname>NonBlocking=</varname> configurations, the precise state of <constant>O_NONBLOCK</constant>
depends on the order in which these services are invoked, and will possibly change after service code
already took possession of the socket file descriptor, simply because the
<constant>O_NONBLOCK</constant> state of a socket is shared by all file descriptors referencing
it. Hence it is essential that all services sharing the same socket use the same
<varname>NonBlocking=</varname> configuration, and do not change the flag in service code
either.</para></listitem>
</varlistentry>
<varlistentry>