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[Mathew Hodson <mathew.hodson@xxxxxxxxx>]

** Tags removed: fd fix

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https://bugs.launchpad.net/bugs/1190344

Title:
  lightdm is leaking FDs -fix

Status in Light Display Manager:
  Fix Released
Status in Light Display Manager 1.10 series:
  Fix Released
Status in Light Display Manager 1.12 series:
  Fix Released
Status in Light Display Manager 1.2 series:
  Fix Released
Status in “lightdm” package in Ubuntu:
  Fix Released
Status in “lightdm” source package in Precise:
  Triaged
Status in “lightdm” source package in Trusty:
  Triaged
Status in “lightdm” source package in Utopic:
  Fix Committed
Status in “lightdm” source package in Vivid:
  Fix Released
Status in Fedora:
  Unknown

Bug description:
  [Impact]
  LightDM doesn't close the server side end of the pipes used to communicate with session processes. This means each session that is created leaks two file descriptors eventually leading to the system stopping it from creating new pipes.

  [Test Case]
  1. Start LightDM
  2. Check how many pipes are open
  # lsof -p {lightdm_pid} | grep FIFO | wc -l
  3. Create sessions by either cycling between users in Unity Greeter or logging in and out
  4. Check how many pipes exist using step 2.
  Expected result:
  No more pipes should be open
  Observed result:
  Many pipes remain open

  [Regression Potential]
  Low. Fix is to close pipes when finished with them. Tested with regression tests.

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