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From a49c79e807843bbd87961b3d4b81ea79076c043e Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Fri, 27 Dec 2013 15:27:24 -0500
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Subject: [PATCH] man: add a note about propagating signals
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---
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man/systemd.service.xml | 39 +++++++++++++++++++++++++--------------
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1 file changed, 25 insertions(+), 14 deletions(-)
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diff --git a/man/systemd.service.xml b/man/systemd.service.xml
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index 71bcfb4..af3e0f2 100644
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--- a/man/systemd.service.xml
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+++ b/man/systemd.service.xml
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@@ -734,22 +734,33 @@ ExecStart=/bin/echo $ONE $TWO ${TWO}
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considered successful termination, in
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addition to the normal successful exit
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code 0 and the signals <constant>SIGHUP</constant>, <constant>SIGINT</constant>,
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- <constant>SIGTERM</constant> and <constant>SIGPIPE</constant>. Exit status
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+ <constant>SIGTERM</constant>, and <constant>SIGPIPE</constant>. Exit status
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definitions can either be numeric exit
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codes or termination signal names,
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- separated by spaces. Example:
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- <literal>SuccessExitStatus=1 2 8
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- <constant>SIGKILL</constant></literal>, ensures that exit
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- codes 1, 2, 8 and the termination
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- signal <constant>SIGKILL</constant> are considered clean
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- service terminations. This option may
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- appear more than once in which case
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- the list of successful exit statuses
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- is merged. If the empty string is
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- assigned to this option, the list is
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- reset, all prior assignments of this
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- option will have no
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- effect.</para></listitem>
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+ separated by spaces. For example:
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+ <programlisting>SuccessExitStatus=1 2 8 <constant>SIGKILL</constant></programlisting>
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+ ensures that exit codes 1, 2, 8 and
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+ the termination signal
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+ <constant>SIGKILL</constant> are
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+ considered clean service terminations.
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+ </para>
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+
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+ <para>Note that if a process has a
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+ signal handler installed and exits by
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+ calling
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+ <citerefentry><refentrytitle>_exit</refentrytitle><manvolnum>2</manvolnum></citerefentry>
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+ in response to a signal, the
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+ information about the signal is lost.
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+ Programs should instead perform cleanup and kill themselves with the same signal instead. See
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+ <ulink url="http://www.cons.org/cracauer/sigint.html">Proper handling of SIGINT/SIGQUIT — How to be a proper program</ulink>.</para>
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+
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+ <para>This option may appear more than once
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+ in which case the list of successful
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+ exit statuses is merged. If the empty
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+ string is assigned to this option, the
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+ list is reset, all prior assignments
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+ of this option will have no
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+ effect.</para></listitem>
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</varlistentry>
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<varlistentry>
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