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

VERSION
    1.17

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    slowly getting out-of-date) is available from the project pages document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
    (RGiersig@cpan.org) 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
    <RGiersig@cpan.org>.

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 <gbarr@pobox.com>, based on the Ptty module by
    Nick Ing-Simmons <nik@tiuk.ti.com>.

    Now maintained and heavily rewritten by Roland Giersig
    <RGiersig@cpan.org>.

    Contains copyrighted stuff from openssh v3.0p1, authored by Tatu Ylonen
    <ylo@cs.hut.fi>, Markus Friedl and Todd C. Miller
    <Todd.Miller@courtesan.com>. 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.