100% CPU utilization when gprolog loses shell connection - 1.4.4 @ Ubuntu 14.04

[Kevin de Berk]

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Hey,

I found a bug where I can cause the gprolog process to use 100% cpu when
it is not calculating or solving anything, but only waiting for input.

Steps to reproduce:
1) Open two separate terminals
2) In terminal 1, execute 'sh -c gprolog'

The gprolog prompt appears.

3) In terminal 2, find the pid of 'sh -c gprolog' and terminate that
process with kill -9

The gprolog process remains alive, but is idling near 0% cpu. The 'sh -c
gprolog' is gone.

4) In terminal 1, enter some text without pressing Enter.

The gprolog process is now at 100% CPU.


Expected behavior:
I expected gprolog to realize that its input or output streams were
closed and that it should terminate. This does happen when I press Enter
at step 4 without entering text. When I enter text, the CPU is at 100%,
when I only press Enter the gprolog process terminates.

- --

with kind regards,
Kevin de Berk
www.axini.com
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