>Number:         13462
>Category:       bin
>Synopsis:       which(1) should not be implemented in csh(1)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jul 14 06:47:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Akinori MUSHA
>Release:        NetBSD 1.5.1
>Organization:
>Environment:
System: NetBSD typhon 1.5.1 NetBSD 1.5.1 (GENERIC) #56: Mon Jul 2 15:54:23 CEST 2001 he@nsa.uninett.no:/usr/src/sys/arch/i386/compile/GENERIC i386

>Description:

	which(1) should be not implemented in csh(1), because if you
	invoke it indirectly from your ~/.cshrc, csh will go into
	almost infinite loop. (In reality it stops when it uses up
	system resource)

>How-To-Repeat:

	Do the following:

$ cd
$ 
$ # first of all, backup your .cshrc
$ mv .cshrc .cshrc.bak
$ 
$ # create a bourne shell script that invokes /usr/bin/which
$ echo 'echo `which ls`' > foo
$ chmod +x foo
$ 
$ # let .cshrc run the command
$ echo '$HOME/foo' > ~/.cshrc
$
$ # ok, let's invoke csh..
$ csh
/home/knu/foo: Cannot fork
/bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls /bin/ls
% # ahh...
%
% # let's clean up
% exit
$ rm ~/foo
$ mv ~/.cshrc.bak ~/.cshrc

>Fix:

	Reimplement which(1) in C or bourne shell.  FreeBSD 5-CURRENT
	has a C version, which you might want to import.  Needless to
	say, it's easy to implement one from scratch.

-- 
                     /
                    /__  __            Akinori.org / MUSHA.org
                   / )  )  ) )  /     FreeBSD.org / Ruby-lang.org
Akinori MUSHA aka / (_ /  ( (__(  @ iDaemons.org / and.or.jp

"Freeze this moment a little bit longer, make each impression
  a little bit stronger..  Experience slips away -- Time stand still"
>Release-Note:
>Audit-Trail:
>Unformatted: