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Franck Bui 8246905af0 logind: fix (again) the race that might happen when logind restores VT 
This patch is a new attempt to fix the race originally described in issue #9754.

The initial fix (commit ad96887a12) consisted in
spawning a sub process that became the controlling process of the VT and hence
kicked the old controlling process off to make sure that the VT wouldn't have
entered in HUP state while logind restored the VT.

But it introduced a regression (see issue #11269) and thus was reverted. But
unlike it was described in the revert commit message, commit
adb8688b3f alone doen't fix the initial race.

This patch fixes the race in a simpler way by trying to restore the VT a second
time after making sure to re-open it if the first attempt fails.

Indeed if the old controlling process dies before or during the first attempt,
logind will fail to restore the VT. At this point the VT is in HUP state but
we're sure that it won't enter in a HUP state a second time. Therefore we will
retry by re-opening the VT to clear the HUP state and by restoring the VT a
second time, which should be safe this time.

Fixes: #9754
Fixes: #13241
 		2019-11-12 14:53:24 +01:00
.github FUNDING: this needs to be yaml 2019-07-08 16:55:31 +02:00
.lgtm/cpp-queries lgtm: complain about accept() [people should use accept4() instead, due to O_CLOEXEC] 2019-04-10 20:03:38 +02:00
.mkosi mkosi: Find hostname command on Arch Linux 2019-11-01 13:34:41 +01:00
catalog catalog: update Polish translation 2019-07-29 09:30:24 +02:00
coccinelle tree-wide: use empty-to-root a bit more 2019-07-16 12:40:22 +02:00
docs boot-loader-spec: add devicetree-overlay key 2019-10-29 11:24:19 +01:00
factory/etc factory: add default /etc/issue file 2019-07-24 08:57:23 +09:00
hwdb.d hwdb: Mark Intel Sensor Hub's accel sensor on Vostro 5581 as being in the base 2019-11-12 00:30:46 +08:00
man Merge pull request #13862 from zachsmith/systemd-tmpfiles-deprecate-for-force 2019-11-12 10:28:59 +01:00
modprobe.d Add SPDX license headers to various assorted files 2017-11-19 19:08:15 +01:00
network network: install wifi-adhoc.network by default, make wifi-{ap,station} examples 2019-10-30 11:21:41 +01:00
po po: update Polish translation 2019-10-26 17:17:30 +02:00
presets Drop my copyright headers 2018-06-14 13:03:20 +02:00
rules.d Rename udev's rules/ to rules.d/ 2019-10-10 00:53:09 +01:00
semaphoreci semaphore: turn on systemd-networkd in lxc-containers on Semaphore 2019-09-25 05:19:12 +00:00
shell-completion core: add support for RestartKillSignal= to override signal used for restart jobs 2019-10-02 14:01:25 +02:00
src logind: fix (again) the race that might happen when logind restores VT 2019-11-12 14:53:24 +01:00
sysctl.d sysctl: prefix ping port range setting with a dash 2019-07-26 09:26:07 +02:00
sysusers.d sysusers,tmpfiles: re-create systemd-network, systemd-resolve and systemd-timesync 2018-07-16 17:11:50 +02:00
test core: change top-level drop-in from -.service.d to service.d 2019-11-07 08:34:53 +01:00
tmpfiles.d Corect man page reference in systemd-nologin.conf comments 2019-09-24 09:48:03 +02:00
tools coverity: replace python with jq 2019-10-30 09:17:04 +01:00
travis-ci coverity: replace python with jq 2019-10-30 09:17:04 +01:00
units meson: allow WatchdogSec= in services to be configured 2019-10-25 17:20:24 +02:00
xorg scripts: use 4 space indentation 2019-04-12 08:30:31 +02:00
.ctags editors: Prevent ctags from following symlinks 2019-02-15 11:01:20 -08:00
.dir-locals.el scripts: use 4 space indentation 2019-04-12 08:30:31 +02:00
.editorconfig scripts: use 4 space indentation 2019-04-12 08:30:31 +02:00
.gitattributes git: indicate that tabs are never OK in the systemd tree 2013-10-30 02:25:38 +01:00
.gitignore gitignore: add nspawn image lock and mkosi temporary files 2018-09-07 20:00:22 +02:00
.lgtm.yml lgtm: use python3 2018-12-10 03:07:17 +09:00
.mailmap mailmap: add entry to fix authorship of commit 2019-10-21 15:10:58 +02:00
.travis.yml travis: skip the right stage 2019-09-07 22:01:16 +00:00
.vimrc scripts: use 4 space indentation 2019-04-12 08:30:31 +02:00
.ycm_extra_conf.py ycm: add doc string for all the functions in configuration file 2017-11-29 13:21:49 -07:00
LICENSE.GPL2
…
LICENSE.LGPL2.1 licence: remove references to old FSF address 2012-12-17 11:41:31 +01:00
Makefile build-sys: Fix Makefile wrapper for install target (#6548) 2017-08-07 11:29:20 +02:00
NEWS core: change top-level drop-in from -.service.d to service.d 2019-11-07 08:34:53 +01:00
README resolved: require at least version 3.6.0 of GnuTLS for DNS-over-TLS 2019-10-29 20:26:05 +01:00
README.md add systemd logo to README.md 2019-10-30 23:22:07 +01:00
TODO Merge pull request #13862 from zachsmith/systemd-tmpfiles-deprecate-for-force 2019-11-12 10:28:59 +01:00
azure-pipelines.yml Free up some resources on Azure Pipelines 2019-07-17 13:28:38 +09:00
configure build-sys: add basic support for ./configure && make && make install 2017-07-18 10:05:06 -04:00
fuzzbuzz.yaml fuzzbuzz: rename fuzz.yaml to fuzzbuzz.yaml 2019-07-10 05:11:52 +03:00
meson.build network: cleanup header inclusion 2019-10-30 22:23:43 +09:00
meson_options.txt meson: allow WatchdogSec= in services to be configured 2019-10-25 17:20:24 +02:00
mkosi.build mkosi: let's update the boot loader also in /efi 2019-03-01 12:41:32 +01:00
mkosi.default mkosi: create .mkosi directory 2016-10-06 11:53:58 -04:00
zanata.xml po: add basic fedora.zanata.org configuration 2018-02-19 13:56:57 +01:00

README.md

systemd - System and Service Manager

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General information about systemd can be found in the systemd Wiki.

Information about build requirements is provided in the README file.

Consult our NEWS file for information about what's new in the most recent systemd versions.

Please see the Hacking guide for information on how to hack on systemd and test your modifications.

Please see our Contribution Guidelines for more information about filing GitHub Issues and posting GitHub Pull Requests.

When preparing patches for systemd, please follow our Coding Style Guidelines.

If you are looking for support, please contact our mailing list or join our IRC channel.

Stable branches with backported patches are available in the stable repo.