[Bug 771] New: ash: HUP signal is ignored

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=771

              Host: i686
            Target: ARM
           Summary: ash: HUP signal is ignored
           Product: Busybox
           Version: 1.15.x
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
        AssignedTo: unassigned at busybox.net
        ReportedBy: simon.kagstrom at netinsight.net
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


Created an attachment (id=803)
 --> (https://bugs.busybox.net/attachment.cgi?id=803)
patch (git format-patch)

We noticed that ash would hang after quitting a telnet session (i.e., Ctrl-]
and quit), busy looping on something and therefore using all CPU it could get.
Exiting normally did not show this behavior.

It turns out that SIGHUP is ignored by ash, and this seems to be the reason
behind the error. Doing

  kill -HUP $$

does nothing with busybox ash, whereas bash will exit if you do that. Further,
doing e.g.,

  trap ls SIGHUP

is also non-functional (other signals will work as expected).


I've attached a patch which fixes the SIGHUP issues, although I'm unsure if
it's the correct fix. I'm using 1.15.2 on ARM (but the issue seems general).


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