*Synopsis*: *ksh93* (20080624_snapshot) doesn't execute CHLD trap
CR 6722134 changed on Jul 31 2008 by <User 1-6Y4MMS>
=== Field ============ === New Value ============= === Old Value =============
Description New Note
====================== =========================== ===========================
*Change Request ID*: 6722134
*Synopsis*: *ksh93* (20080624_snapshot) doesn't execute CHLD trap
Product: solaris
Category: shell
Subcategory: korn93
Type: Defect
Subtype:
Status: 6-Fix Understood
Substatus:
Priority: 5-Very Low
Introduced In Release:
Introduced In Build:
Responsible Engineer: <User 1-5Q-5151>
Keywords: opensolaris
=== *Description* ============================================================
Category
shell
Sub-Category
korn
Description
With "set -o monitor" on and "set -o notify" off, ksh88 executes the CHLD
trap while waiting for interactive input when a background job completes.
ksh93 appears not to execute the CHLD trap when a background job terminates.
Probably related: I noticed that with no CHLD trap set, but -o monitor and
-o notify set, there should be a similar asynchronous job completion notice.
It works in ksh88 but not in this ksh93 build.
Frequency
Always
Regression
Solaris 10
Steps to Reproduce
$ ksh93
$ set -o monitor
$ trap -- 'jobs -l' CHLD
$ sleep 5 &
$ # (wait at the prompt for the background job to complete.)
Expected Result
$ sleep 5 &
[1] 12451
$
[1] + 12451 Done sleep 5 &
(When the background job finishes, 'jobs -l' is executed.
If you hit return afterward you will just get a prompt.)
Actual Result
$ sleep 5 &
[1] 12454
$
(There is no output at all when the background job finishes.
If you hit return you will get the job notice resulting from the
monitor option.)
Error Message(s)
Test Case
Workaround
Submitter wants to work on bug
No
Additional configuration information
Tried on snv_62 and snv_81.
*** (#1 of 2): 2008-07-03 02:35:19 GMT+00:00 <User 1-F4SZV>
Testcase (this is a module for the ksh93 test suite) to reproduce the problem:
-------- snip --------
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or http://www.opensolaris.org/os/licensing.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END
#
#
# Copyright 2008 Sun Microsystems, Inc. All rights reserved.
# Use is subject to license terms.
#
# ident "%Z%%M% %I% %E% SMI"
#
function err_exit
{
print -u2 -n "\t"
print -u2 -r ${Command}[$1]: "${@:2}"
(( Errors+=1 ))
}
alias err_exit='err_exit $LINENO'
integer Errors=0
s="$($SHELL -c '
set -o errexit
integer i
trap "print got_child" SIGCHLD
sleep 5 &
sleep 7 &
for ((i=0 ; i < 15 ; i++)) ; do
print $i
sleep 1
# external, non-background command for which a SIGCHLD should
# _not_ be fired
/bin/true >/dev/null
done
print "loop finished"
wait
print "done"
' 2>&1 )" || err_exit "test loop failed."
[[ "$s" == ~(Er)$'14\nloop finished\ndone' ]] || err_exit "Expected '14\nloop
finished\ndone' at the end of the output, got ${s}."
[[ "$s" == ~(El)$'0\n1\n2' ]] || err_exit "Expected '0\n1\n2' as at the
beginning of the output, got ${s}."
integer count
(( count=$(fgrep "got_child" <<< "$s" | wc -l) )) || err_exit "counting failed."
(( count == 2 )) || err_exit "Expected count==2, got count==${count}."
exit $((Errors))
# EOF.
-------- snip --------
*** (#2 of 2): 2008-07-31 23:14:03 GMT+00:00 <User 1-6Y4MMS>
=== *Workaround* =============================================================
=== *Additional Details* =====================================================
Targeted Release:
Commit To Fix In Build:
Fixed In Build:
Integrated In Build:
Verified In Build:
See Also:
Duplicate of:
Hooks:
Hook1:
Hook2:
Hook3:
Hook4:
Hook5:
Hook6: <email address omitted>
Program Management:
Root Cause:
Fix Affects Documentation: No
Fix Affects Localization: No
=== *History* ================================================================
Date Submitted: 2008-07-03 02:35:19 GMT+00:00
Submitted By: <User 1-F4SZV>
Status Changed Date Updated Updated By
6-Fix Understood 2008-07-03 18:45:45 GMT+00:00 <User 1-5Q-5151>
=== *Service Request* ========================================================
Impact: Limited
Functionality: Secondary
Severity: 4
Product Name: solaris
Product Release: solaris_nevada
Product Build: snv_81
Operating System: solaris_nevada
Hardware: x86
Submitted Date: 2008-07-03 02:35:20 GMT+00:00
=== *Multiple Release (MR) Cluster* - 0 ======================================
