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authorhttps://me.yahoo.com/a/g3Ccalpj0NhN566pHbUl6i9QF0QEkrhlfPM-#b1c14 <diana@web>2015-02-16 20:08:03 +0100
committerGNU Hurd web pages engine <web-hurd@gnu.org>2015-02-16 20:08:03 +0100
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-[[!meta copyright="Copyright © 2013, 2014 Free Software Foundation, Inc."]]
-
-[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
-id="license" text="Permission is granted to copy, distribute and/or modify this
-document under the terms of the GNU Free Documentation License, Version 1.2 or
-any later version published by the Free Software Foundation; with no Invariant
-Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
-is included in the section entitled [[GNU Free Documentation
-License|/fdl]]."]]"""]]
-
-Upstart is an event based init system that is GPL licensed, however upstream
-contributions are under a CLA that permits proprietary relicensing.
-
-As of Jan 2 2013, Debian is considering adopting Upstart as an init system on
-GNU/Linux, and on GNU/kFreeBSD when the port to kFreeBSD is finished.
-
-The following are the words of Colin Watson on the debian-ctte@lists.debian.org
-mailing list and list the requirements of a potential HURD port:
-
->I haven't looked at this in much detail, and I suspect Dimitri hasn't
-yet although IIRC he did express some interest in doing so. But I
-haven't seen anyone else try to outline the scope of a port, so let me
-try to do so for the sake of general understanding. As far as I know,
-the hardest parts would be inotify, ptrace, and prctl
-(PR_SET_CHILD_SUBREAPER).
-
->inotify is used to notice changes to configuration files. This is
-certainly helpful for users, but it isn't critical as "initctl
-reload-configuration" works without it. We could probably do without
-this with the aid of a dpkg trigger.
-
->ptrace is used for "expect fork" and "expect daemon"; as I indicated in
-another post, I think it would be preferable to avoid these in Debian
-and quite possibly to compile them out. (This would mean we wouldn't be
-able to translate Ubuntu jobs quite as directly, and a number of
-important jobs would definitely need to be changed, but the conversion
-isn't usually particularly difficult.)
-
->prctl (PR_SET_CHILD_SUBREAPER) is used to make SIGCHLD notification work
-properly when Upstart is supervising a user session. This isn't a
-required feature and could easily be compiled out until suitable kernel
-support is available (this actually seems like the sort of thing that
-could be done in the Hurd without too much difficulty, but I haven't
-looked into it). If absent, it might well impede the ability to do an
-advanced desktop port, but it wouldn't get in the way of porting the
-bulk of services.
-
->There might also be odds and ends around the details of wait status
-handling.
-
-inotify seems to be a feature that is often used in GNU/Linux programs, and
-implementing the feature in the HURD seems like a better and more rewarding
-option than porting the code in Upstart.
-
-Although many daemons double fork, that behavior seems to be dying out, and
-one can comfortably ignore the "expect fork/daemon" functionality of Upstart
-(and compile it out).
-
-[[!tag open_issue_porting]]
-
-See also the discussion about upstart on the [[systemd]] page.