[Bug 812913] [NEW] poor console performance if dbus-launch run with "--exit-with-session"

[James Hunt]

Public bug reported:

Running dbus-launch from the console results in very poor performance
(keyboard keys need to be held down for multiple seconds for an echo of
that character to appear on the console).

To recreate:

  killall dbus-launch &>/dev/null
  eval `dbus-launch --auto-syntax --exit-with-session`
  start typing :-)

Note that the problem only occurs with "--exit-with-session": This
invocation is fine:

  killall dbus-launch &>/dev/null
  eval `dbus-launch --auto-syntax`

Problem appears to be related to function tools/dbus-
launch.c:kill_bus_when_session_ends() which is calling select(2)
followed by read(2) in an infinite loop (until the shell exits) for all
input the user types.

Poor performance observed in oneiric VM (kvm).

** Affects: dbus (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/812913

Title:
  poor console performance if dbus-launch run with "--exit-with-session"

Status in “dbus” package in Ubuntu:
  New

Bug description:
  Running dbus-launch from the console results in very poor performance
  (keyboard keys need to be held down for multiple seconds for an echo
  of that character to appear on the console).

  To recreate:

    killall dbus-launch &>/dev/null
    eval `dbus-launch --auto-syntax --exit-with-session`
    start typing :-)

  Note that the problem only occurs with "--exit-with-session": This
  invocation is fine:

    killall dbus-launch &>/dev/null
    eval `dbus-launch --auto-syntax`

  Problem appears to be related to function tools/dbus-
  launch.c:kill_bus_when_session_ends() which is calling select(2)
  followed by read(2) in an infinite loop (until the shell exits) for
  all input the user types.

  Poor performance observed in oneiric VM (kvm).

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