NAME
   IO::Tty - Low-level allocate a pseudo-Tty, import constants.

VERSION
   1.16

SYNOPSIS
       use IO::Tty qw(TIOCNOTTY);
       ...
       # use only to import constants, see IO::Pty to create ptys.

DESCRIPTION
   "IO::Tty" is used internally by "IO::Pty" to create a pseudo-tty. You
   wouldn't want to use it directly except to import constants, use
   "IO::Pty". For a list of importable constants, see IO::Tty::Constant.

   Windows is now supported, but ONLY under the Cygwin environment, see
   <http://sources.redhat.com/cygwin/>.

   Please note that pty creation is very system-dependend. From my
   experience, any modern POSIX system should be fine. Find below a list of
   systems that "IO::Tty" should work on. A more detailed table (which is
   slowly getting out-of-date) is available from the project pages document
   manager at SourceForge <http://sourceforge.net/projects/expectperl/>.

   If you have problems on your system and your system is listed in the
   "verified" list, you probably have some non-standard setup, e.g. you
   compiled your Linux-kernel yourself and disabled ptys (bummer!). Please
   ask your friendly sysadmin for help.

   If your system is not listed, unpack the latest version of "IO::Tty", do
   a 'perl Makefile.PL; make; make test; uname -a' and send me
   ([email protected]) the results and I'll see what I can deduce from
   that. There are chances that it will work right out-of-the-box...

   If it's working on your system, please send me a short note with details
   (version number, distribution, etc. 'uname -a' and 'perl -V' is a good
   start; also, the output from "perl Makefile.PL" contains a lot of
   interesting info, so please include that as well) so I can get an
   overview. Thanks!

VERIFIED SYSTEMS, KNOWN ISSUES
   This is a list of systems that "IO::Tty" seems to work on ('make test'
   passes) with comments about "features":

   *   AIX 4.3

       Returns EIO instead of EOF when the slave is closed. Benign.

   *   AIX 5.x

   *   FreeBSD 4.4

       EOF on the slave tty is not reported back to the master.

   *   OpenBSD 2.8

       The ioctl TIOCSCTTY sometimes fails. This is also known in
       Tcl/Expect, see http://expect.nist.gov/FAQ.html

       EOF on the slave tty is not reported back to the master.

   *   Darwin 7.9.0

   *   HPUX 10.20 & 11.00

       EOF on the slave tty is not reported back to the master.

   *   IRIX 6.5

   *   Linux 2.2.x & 2.4.x

       Returns EIO instead of EOF when the slave is closed. Benign.

   *   OSF 4.0

       EOF on the slave tty is not reported back to the master.

   *   Solaris 8, 2.7, 2.6

       Has the "feature" of returning EOF just once?!

       EOF on the slave tty is not reported back to the master.

   *   Windows NT/2k/XP (under Cygwin)

       When you send (print) a too long line (>160 chars) to a non-raw pty,
       the call just hangs forever and even alarm() cannot get you out.
       Don't complain to me...

       EOF on the slave tty is not reported back to the master.

   *   z/OS

   The following systems have not been verified yet for this version, but a
   previous version worked on them:

   *   SCO Unix

   *   NetBSD

       probably the same as the other *BSDs...

   If you have additions to these lists, please mail them to
   <[email protected]>.

SEE ALSO
   IO::Pty, IO::Tty::Constant

MAILING LISTS
   As this module is mainly used by Expect, support for it is available via
   the two Expect mailing lists, expectperl-announce and
   expectperl-discuss, at

     http://lists.sourceforge.net/lists/listinfo/expectperl-announce

   and

     http://lists.sourceforge.net/lists/listinfo/expectperl-discuss

AUTHORS
   Originally by Graham Barr <[email protected]>, based on the Ptty module by
   Nick Ing-Simmons <[email protected]>.

   Now maintained and heavily rewritten by Roland Giersig
   <[email protected]>.

   Contains copyrighted stuff from openssh v3.0p1, authored by Tatu Ylonen
   <[email protected]>, Markus Friedl and Todd C. Miller
   <[email protected]>. I also got a lot of inspiration from the
   pty code in Xemacs.

COPYRIGHT
   Now all code is free software; you can redistribute it and/or modify it
   under the same terms as Perl itself.

   Nevertheless the above AUTHORS retain their copyrights to the various
   parts and want to receive credit if their source code is used. See the
   source for details.

DISCLAIMER
   THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
   WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
   NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
   ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

   In other words: Use at your own risk. Provided as is. Your mileage may
   vary. Read the source, Luke!

   And finally, just to be sure:

   Any Use of This Product, in Any Manner Whatsoever, Will Increase the
   Amount of Disorder in the Universe. Although No Liability Is Implied
   Herein, the Consumer Is Warned That This Process Will Ultimately Lead to
   the Heat Death of the Universe.

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