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The following example script uses commonly found idioms for handling
signals and exit cleanup, but when run with NetBSD sh or ksh it fails to
work in a way that is compatible with the real AT&T ksh93, or with GNU
Bash:

	trap 'echo exit handler for $$: $? 1>&2' 0
	trap 'trap 1; echo pid $$: got HUP 1>&2; kill -1 $$' 1
	trap 'trap 2; echo pid $$: got INT 1>&2; kill -2 $$' 2
	trap 'trap 3; echo pid $$: got QUIT 1>&2; kill -3 $$' 3
	trap 'trap 13; echo pid $$: got PIPE 1>&2; kill -13 $$' 13
	trap 'trap 15; echo pid $$: got TERM 1>&2; kill -15 $$' 15
=09
	cat
	rc=3D$?
=09
	echo "normal exit: $rc"
	exit $rc

The expected behaviour is that the exit handler (trap 0) will run after
any other interrupt handler:

	$ ksh93 src/tsigtrap.sh
	aslkjf
	aslkjf
	^?pid 13774: got INT
	exit handler for 13774: 258

	$ bash src/tsigtrap.sh    
	asdf
	asdf
	^?pid 13794: got INT
	exit handler for 13794: 0

(bash doesn't set the exit code soon enough to see it in the handler)

However /bin/sh and /bin/ksh only run the interrupt handler:

	$ /bin/sh src/tsigtrap.sh
	asdf
	asdf
	^?pid 13775: got INT

	$ /bin/ksh src/tsigtrap.sh
	asdf
	asdf
	^?pid 13778: got INT


I'm not sure what POSIX says should happen, though I'm more concerned
with ksh93 compatibility in this particular case anyway.

Fixing this right now appears to be way more work than I have time for.

Is this worth fixing?  Should I send-pr so that someone interested and
with time might eventually pick it up and work on it?


It also seems that in ksh93 trap handlers in functions are transient
whereas in /bin/ksh they get set and left there when the function is
executed.  This is probably even harder to fix given the current
implementation.

--=20
						Greg A. Woods

H:+1 416 218-0098 W:+1 416 489-5852 x122 VE3TCP RoboHack <woods@robohack.ca>
Planix, Inc. <woods@planix.com>       Secrets of the Weird <woods@weird.com>

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