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[Bug 1648637] Re: handle interruped read and write calls

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Robert Ancell <robert.ancell@xxxxxxxxxxxxx>
Date: Thu, 08 Dec 2016 21:48:34 -0000
Reply-to: Bug 1648637 <1648637@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Also affects: lightdm/1.10
   Importance: Undecided
       Status: New

** Also affects: lightdm/1.20
   Importance: Undecided
       Status: New

** Also affects: lightdm/1.18
   Importance: Undecided
       Status: New

** Also affects: lightdm/1.2
   Importance: Undecided
       Status: New

** Also affects: lightdm (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: lightdm (Ubuntu Yakkety)
   Importance: Undecided
       Status: New

** Also affects: lightdm (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: lightdm (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: lightdm (Ubuntu Precise)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1648637

Title:
  handle interruped read and write calls

Status in Light Display Manager:
  Fix Committed
Status in Light Display Manager 1.10 series:
  New
Status in Light Display Manager 1.18 series:
  New
Status in Light Display Manager 1.2 series:
  New
Status in Light Display Manager 1.20 series:
  New
Status in lightdm package in Ubuntu:
  New
Status in lightdm source package in Precise:
  New
Status in lightdm source package in Trusty:
  New
Status in lightdm source package in Xenial:
  New
Status in lightdm source package in Yakkety:
  New

Bug description:
  Use SA_RESTART flag to make sure that interrupted calls to read and/or
  write are restarted.

  In my case read is interrupted when reading login1_session_id. Result
  of not handling EINTR error is that login1_session_id is set to NULL
  and console_kit_cookie gets login1 session id.

  Related warnings in lightdm.log:
  [+0.44s] WARNING: Session pid=617: Error reading from session: Interrupted system call
  [+0.70s] DEBUG: Activating VT 7
  [+0.70s] DEBUG: Activating ConsoleKit session c1
  [+0.70s] WARNING: Error getting ConsoleKit session: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.ConsoleKit was not provided by any .service files

  And because login1_session_id is null fix for 1637758 bug does not
  work.

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