X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=man%2Fdaemon.xml;h=0d29e7aa1c56843e1da7230cba9b7be50045a4a5;hb=cbc06dcd8f74e9e757c55884a4acf49784fc3444;hp=fb22e6c6165d88f4d950542fba0e7a37baf0d25a;hpb=828f33e89bc2fa7ee9bc9f977c04d0e30336d848;p=elogind.git
diff --git a/man/daemon.xml b/man/daemon.xml
index fb22e6c61..0d29e7aa1 100644
--- a/man/daemon.xml
+++ b/man/daemon.xml
@@ -8,16 +8,16 @@
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License
+ You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see .
-->
@@ -44,7 +44,7 @@
daemon
- Writing and Packaging System Daemons
+ Writing and packaging system daemons
@@ -115,14 +115,14 @@
In the child, call
fork() again, to
- ensure the daemon can never re-aquire
+ ensure the daemon can never re-acquire
a terminal again.Call exit() in the
first child, so that only the second
child (the actual daemon process)
stays around. This ensures that the
- daemon process is reparented to
+ daemon process is re-parented to
init/PID 1, as all daemons should
be.
@@ -181,11 +181,11 @@
exit() in the
original process. The process that
invoked the daemon must be able to
- rely that this
+ rely on that this
exit() happens
after initialization is complete and
all external communication channels
- established and
+ are established and
accessible.
@@ -196,7 +196,7 @@
compatibility with SysV systems should
implement the scheme pointed out
above. However, it is recommended to make this
- behaviour optional and configurable via a
+ behavior optional and configurable via a
command line argument, to ease debugging as
well as to simplify integration into systems
using systemd.
@@ -271,7 +271,7 @@
for details.
As much as possible,
- rely on the init systemd's
+ rely on the init system's
functionality to limit the access of
the daemon to files, services and
other resources. i.e. in the case of
@@ -323,7 +323,7 @@
Instead of using the
syslog() call to log directly to the
- system logger, a new-style daemon may
+ system syslog service, a new-style daemon may
choose to simply log to STDERR via
fprintf(), which is then forwarded to
syslog by the init system. If log
@@ -345,7 +345,7 @@
StandardError=syslog
in the service unit file. For details
see
- sd-daemon7
+ sd-daemon3
and
systemd.exec5.
@@ -397,7 +397,7 @@
url="http://refspecs.freestandards.org/LSB_3.1.1/LSB-Core-generic/LSB-Core-generic/iniscrptact.html">LSB
Linux Standard Base Core
Specification. This method of
- activation is supported ubiquitiously on Linux
+ activation is supported ubiquitously on Linux
init systems, both old-style and new-style
systems. Among other issues SysV init scripts
have the disadvantage of involving shell
@@ -449,7 +449,7 @@
activation of daemons. However, the primary
advantage of this scheme is that all providers
and all consumers of the sockets can be
- started in parallel as soon als all sockets
+ started in parallel as soon as all sockets
are established. In addition to that daemons
can be restarted with losing only a minimal
number of client transactions or even any
@@ -462,13 +462,13 @@
New-style daemons which support socket
activation must be able to receive their
- sockets from the init system, instead of of
+ sockets from the init system, instead of
creating and binding them themselves. For
details about the programming interfaces for
this scheme provided by systemd see
sd_listen_fds3
and
- sd-daemon7. For
+ sd-daemon3. For
details about porting existing daemons to
socket-based activation see below. With
minimal effort it is possible to implement
@@ -543,10 +543,10 @@
the hardware of the respective kind is plugged
in or otherwise becomes available. In a
new-style init system it is possible to bind
- activation to hardware plug/unplug events. In systemd,
- kernel devices appearing in the sysfs/udev
- device tree can be exposed as units if they
- are tagged with the string
+ activation to hardware plug/unplug events. In
+ systemd, kernel devices appearing in the
+ sysfs/udev device tree can be exposed as units
+ if they are tagged with the string
"systemd". Like any other
kind of unit they may then pull in other units
when activated (i.e. Plugged in) and thus
@@ -570,8 +570,9 @@
bluetoothd.service via
controlling a
bluetooth.target.wants/
- symlink uniformly with a tool like
- systemd-install1
+ symlink uniformly with a command like
+ enable of
+ systemctl1
instead of manipulating the udev
ruleset.
@@ -643,7 +644,7 @@
to the CPU and IO schedulers. If a process
executed by the init system shall not
negatively impact the amount of CPU or IO
- bandwith available to other processes, it
+ bandwidth available to other processes, it
should be configured with
CPUSchedulingPolicy=idle
and/or
@@ -704,24 +705,6 @@
operating
system-independent.
- Since not all syslog
- implementations are socket-activatable
- yet, it is recommended to place an
- After=syslog.target
- dependency in service files for
- daemons that can log to
- syslog. syslog.target
- then either pulls in the syslog daemon
- itself or simply the activation
- socket. A Wants= or
- even Requires=
- dependency should generally not be
- added, since it should be up to the
- administrator whether he wants to
- enable logging or not, and most syslog
- clients work fine if no log daemon is
- running.
-
Make sure to include
an [Install]
section including installation
@@ -756,19 +739,20 @@
install their systemd unit files in the
directory returned by pkg-config
systemd
- --variable=systemdsystemunitdir
- (for system services),
- resp. pkg-config systemd
- --variable=systemdsessionunitdir
- (for session services). This will make the
+ --variable=systemdsystemunitdir (for
+ system services) or pkg-config
+ systemd
+ --variable=systemduserunitdir
+ (for user services). This will make the
services available in the system on explicit
request but not activate them automatically
during boot. Optionally, during package
installation (e.g. rpm -i
by the administrator) symlinks should be
created in the systemd configuration
- directories via the
- systemd-install1
+ directories via the enable
+ command of the
+ systemctl1
tool, to activate them automatically on
boot.
@@ -783,15 +767,17 @@
AC_ARG_WITH([systemdsystemunitdir],
AS_HELP_STRING([--with-systemdsystemunitdir=DIR], [Directory for systemd service files]),
[], [with_systemdsystemunitdir=$($PKG_CONFIG --variable=systemdsystemunitdir systemd)])
-AC_SUBST([systemdsystemunitdir], [$with_systemdsystemunitdir])
-AM_CONDITIONAL(HAVE_SYSTEMD, [test -n "$with_systemdsystemunitdir"])
+if test "x$with_systemdsystemunitdir" != xno; then
+ AC_SUBST([systemdsystemunitdir], [$with_systemdsystemunitdir])
+fi
+AM_CONDITIONAL(HAVE_SYSTEMD, [test -n "$with_systemdsystemunitdir" -a "x$with_systemdsystemunitdir" != xno ])
This snippet allows automatic
installation of the unit files on systemd
machines, and optionally allows their
installation even on machines lacking
systemd. (Modification of this snippet for the
- session unit directory is left as excercise to the
+ user unit directory is left as an exercise for the
reader.)Additionally, to ensure that
@@ -815,30 +801,73 @@ endif
In the
rpm8
- .spec file use a snippet like
- the following to enable/disable the service
- during installation/deinstallation. Consult
+ .spec file use snippets
+ like the following to enable/disable the
+ service during
+ installation/deinstallation. This makes use of
+ the RPM macros shipped along systemd. Consult
the packaging guidelines of your distribution
for details and the equivalent for other
- package managers:
+ package managers.
+
+ At the top of the file:
+
+ BuildRequires: systemd
+%{?systemd_requires}
+
+ And as scriptlets, further down:%post
-/usr/bin/systemd-install --realize enable foobar.service foobar.socket >/dev/null 2>&1 || :
+%systemd_post foobar.service foobar.socket
%preun
-if [ "$1" -eq 0 ]; then
- /usr/bin/systemd-install --realize disable foobar.service foobar.socket >/dev/null 2>&1 || :
+%systemd_preun foobar.service foobar.socket
+
+%postun
+%systemd_postun
+
+ If the service shall be restarted during
+ upgrades replace the
+ %postun scriptlet above
+ with the following:
+
+ %postun
+%systemd_postun_with_restart foobar.service
+
+ Note that
+ %systemd_post and
+ %systemd_preun expect the
+ names of all units that are installed/removed
+ as arguments, separated by
+ spaces. %systemd_postun
+ expects no
+ arguments. %systemd_postun_with_restart
+ expects the units to restart as
+ arguments.
+
+ To facilitate upgrades from a package
+ version that shipped only SysV init scripts to
+ a package version that ships both a SysV init
+ script and a native systemd service file, use
+ a fragment like the following:
+
+ %triggerun -- foobar < 0.47.11-1
+if /sbin/chkconfig --level 5 foobar ; then
+ /bin/systemctl --no-reload enable foobar.service foobar.socket >/dev/null 2>&1 || :
fi
- Depending on whether your service should
- or should not be started/stopped/restarted
- during package installation, deinstallation or
- upgrade, a different argument to
- may be
- specified. See
- systemd-install1
- for details.
-
+ Where 0.47.11-1 is the first package
+ version that includes the native unit
+ file. This fragment will ensure that the first
+ time the unit file is installed it will be
+ enabled if and only if the SysV init script is
+ enabled, thus making sure that the enable
+ status is not changed. Note that
+ chkconfig is a command
+ specific to Fedora which can be used to check
+ whether a SysV init script is enabled. Other
+ operating systems will have to use different
+ commands here.
@@ -909,8 +938,7 @@ fi