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Bug 1273500

Summary:	Inconsistent state after SIGINT during eval
Product:	Red Hat Enterprise Linux 7	Reporter:	David Kaferad // Dee'Kej <deekej>
Component:	tcsh	Assignee:	David Kaferad // Dee'Kej <deekej>
Status:	CLOSED ERRATA	QA Contact:	Iveta Wiedermann <isenfeld>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.2	CC:	bnater, isenfeld, ovasik, pandrade, qe-baseos-apps
Target Milestone:	rc	Keywords:	Patch
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	tcsh-6.18.01-10.el7	Doc Type:	Bug Fix
Doc Text:	tcsh no longer in an inconsistent state after a command interruption Interrupting the "eval sleep 10" command left the tcsh shell in an incosistent state. Consequently, it was necessary to press the Ctrl+D key combination twice to successfully exit the shell. With this update, tcsh correctly exits after pressing Ctrl+D once.	Story Points:	---
Clone Of:	1219923	Environment:
Last Closed:	2016-11-04 01:46:10 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1219923
Bug Blocks:	1203710, 1289025, 1295829, 1313485

Description David Kaferad // Dee'Kej 2015-10-20 15:05:54 UTC

+++ This bug was initially created as a clone of Bug #1219923 +++

Description of problem (quoting cloned bug description):
--------------------------------------------------------

This was reported to upstream:

"""
Hi,

An user reported a problem, that apparently happens for quite
some time.

The user reports that interrupting this command:

eval sleep 10

would keep history in tcsh-6.14.00, but not in tcsh-6.18.01.
Actually, I believe the history not being logged is due to
http://pkgs.fedoraproject.org/cgit/tcsh.git/tree/tcsh-6.18.00-history-file-locking.patch

and the problem is another, as the inconsistent state
happens in all tcsh versions. Basically, when doeval()
calls process(), process() does not leave, so one needs
to ^D twice to get back to the consistent state.

The attached patch correct this condition, and based
on code I could read is correct, but I would like some
feedback on it.

Thanks,
Paulo
"""

-----------------

Version-Release number of selected component (if applicable):
tcsh-6.18.01-8.el7.x86_64

How reproducible:
Always

Steps to Reproduce:
1. run 'tcsh'.
2. run command:
> eval sleep 10
3. press <Ctrl-C> during that time
4. press <Ctrl-D> to close the terminal

Actual results:
You have to press <Ctrl-D> once again to actually exit the terminal.

Expected results:
The 'tcsh' exits normally after first pressing of <Ctrl-D>.

--- Additional comment from Paulo Andrade on 2015-05-09 08:59:43 EDT ---

Update patch, as initially proposed patch would
break the shell (was exiting if pressing ^C),
while the idea was to just leave the inconsistent
state after ^C during eval.

--- Additional comment from Fridolín Pokorný on 2015-05-13 08:31:13 EDT ---

Thanks for the report and provided patch!

It looks OK to me and it sounds reasonable to merge this patch, no fail noted in upstream testsuite as well.

--- Additional comment from David Kaspar [Dee'Kej] on 2015-10-20 07:12:21 EDT ---

Here is the mailing list conversation mentioned in the comment #0:
http://mx.gw.com/pipermail/tcsh-bugs/2015-May/000925.html

--- Additional comment from David Kaspar [Dee'Kej] on 2015-10-20 07:22:03 EDT ---

The conversation in the mailing list might be misleading to somebody - it might look like the patch was not accepted:

> And removed. This breaks the shell completely; a ^C makes it exit.
>
> christos

However, will small tweak, the patch was accepted by the upstream:
https://github.com/tcsh-org/tcsh/commit/5376dd911afa817a802aa736a69b3c0546b2b188

Comment 6 errata-xmlrpc 2016-11-04 01:46:10 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2260.html