this has been fixed in the upstream source since 2008-12-02

On Fri, 23 Oct 2009 11:53:50 -0600 (MDT) bugmail-sender at Sun.COM wrote:
> *Synopsis*: *ksh93* does not understand "THAW" as a signal for use with trap

> CR 6778077 changed on Oct 23 2009 by <User 1-7MTUEB>

> === Field ============ === New Value ============= === Old Value =============

> Commit to Fix in Build snv_127                                                
> Status                 7-Fix in Progress           6-Fix Understood           
> ====================== =========================== ===========================

>      
> *Change Request ID*: 6778077

> *Synopsis*: *ksh93* does not understand "THAW" as a signal for use with trap

>   Product: solaris
>   Category: shell
>   Subcategory: korn93
>   Type: Defect
>   Subtype: 
>   Status: 7-Fix in Progress
>   Substatus: 
>   Priority: 4-Low
>   Introduced In Release: solaris_nevada
>   Introduced In Build: snv_72
>   Responsible Engineer: <User 1-7MTUEB>
>   Keywords: oss-request, oss-sponsor

> === *Description* ============================================================
> While ksh93 understand THAW in the list of signals for kill it does not 
> understand it for "trap'

> : pod5.eu TS 6 $; kill -l | egrep '(THAW|FREEZE)'
> FREEZE
> THAW
> : pod5.eu TS 7 $; trap "echo THAW" THAW
> ksh93: trap: THAW: bad trap
> : pod5.eu TS 8 $;

> Using the signal number (35) works around this.

> *** (#1 of 1): 2008-12-01 09:39:52 GMT+00:00 <User 1-5Q-10481>

> === *Public Comments* ========================================================

> === *Workaround* =============================================================

> === *Additional Details* =====================================================
>         Targeted Release: solaris_nevada
>         Commit To Fix In Build: snv_127
>         Fixed In Build: 
>         Integrated In Build: 
>         Verified In Build: 
>   See Also: 6793763
>   Duplicate of: 
>   Hooks:
>         Hook1: <email address omitted>
>         Hook2: 
>         Hook3: 
>         Hook4: 
>         Hook5: <email address omitted>
>         Hook6: <email address omitted>
>   Program Management: 
>   Root Cause: Insufficient Testing
>   Fix Affects Documentation: No
>   Fix Affects Localization: No

> === *History* ================================================================
>         Date Submitted: 2008-12-01 09:39:51 GMT+00:00
>         Submitted By: <User 1-5Q-10481>

>         Status Changed    Date Updated                  Updated By
>         5-Cause Known     2008-12-02 16:47:50 GMT+00:00 <User 1-5Q-5151>
>         6-Fix Understood  2009-06-16 15:21:25 GMT+00:00 <User 1-1SURPB>
>         7-Fix in Progress 2009-10-23 17:32:35 GMT+00:00 <User 1-7MTUEB>

> === *Service Request* ========================================================
>         Impact: Limited
>         Functionality: Secondary
>         Severity: 4
>         Product Name: solaris
>         Product Release: solaris_nevada
>         Product Build: 
>         Operating System: snv_101a
>         Hardware: generic
>         Submitted Date: 2008-12-01 09:39:52 GMT+00:00

> === *Multiple Release (MR) Cluster* - 0 ======================================

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