Re: List of packages shipping shell scripts with bashisms + MBF proposal
Raphael Geissert <atomo64+debian@gmail.com> writes:
> Russ Allbery wrote:
>
>> Clint Adams <schizo@debian.org> writes:
>>
>>> Since 0.5.6, it does not; the only number it understands is the
>>> pseudo-signal 0, mandated by POSIX.
>>
>> Oh, sorry, you're of course correct. I missed the 0 == n test in
>> gettrap(). Sorry about the confusion.
>>
>>> The reason POSIX doesn't allow numbers is that they are inconsistent
>>> from platform to platform. People who learn signals on a commercial OS
>>> of yore sometimes assume that signal 5 means something other than
>>> SIGTRAP on Debian, and script traps and kills that end up not doing what
>>> is intended.
>>
>> This is a good point. However, it's worth noting that the XSI extension
>> to POSIX doesn't allow you to use just any numbers. It specifically lets
>> you use numbers for HUP, INT, QUIT, ABRT, KILL, ALRM, and TERM and nothing
>> else. I think that's fairly portable.
>>
>
> So should I only ignore those specifying a signal number in the 1-15 range?
I'd suggest complaining about those that specify numbers other
than 0, 1, 2, 3, 6, 9, 14, or 15. See
http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
--
Ben Pfaff
http://benpfaff.org
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