IO_Tty

 

NAME

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

VERSION

1.08  

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 A more detailed table (which is slowly getting out-of-date) is available from the project pages document manager at SourceForge 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]>.