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Re: Announcing ptyfix
From: Casper Dik <Casper.Dik () SUN COM>
Date: Wed, 2 May 2001 18:41:01 +0200

Paul Szabo <psz () MATHS USYD EDU AU> writes:

The privileged (setuid root) command ptyfix is used from within executables
that use the openpty() call. An example is xterm: with this helper, xterm
itself does not need to be setuid.

The correct fix is to implement SysV-style PTYs.  I think they are
required by SuSv2 as well.  Only some BSD systems do not provide this
kind of PTYs, almost all other flavors do.

Currently ptyfix works only on Compaq Tru64 UNIX (DEC OSF/1) machines.

The helper application is not required, you should open /dev/ptmx or
/dev/ptmx_bsd and use grantpt() and unlockpt().  (The True64 5.1
manpage suggests that openpty() already uses SysV PTYs, but that's not
mentioned in earlier versions, such as DIGITAL UNIX 4.0D.)

Of The SysV style-ptys do generally use a helper applications.
(Typically, it's /usr/lib/pt_chmod)


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