mellin@lan.informatik.tu-muenchen.dbp.de (Reiner Mellin) (07/17/89)
Hello,
The following shar-archive contains a beta-version of my pty-filemanager.
If you find any undocumented differences to the SCF+driver Version of the
ptys or bugs please drop me a message.
Highlights:
- unlimited number of ptys (memory dependant)
- any legal os9-filename for a pty: e.g: '/[pt]ty/any$name_u$like'
- faster than the SCF+driver version (faktor 2 and I expect to
get a factor of at least 4 soon).
To install it , just uudecode all *.uu files and load these via 'load'.
I have heard that microware has a PTTY-Filemanger too, how do mine and their
version differ ?
Have Fun ....
Reimer
PS: i use ptys mostly for 'screen' and 'mgr'.
PPS: all written in C, is there some interest in the sources ?
#! /bin/sh
# This is a shell archive. Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file". To overwrite existing
# files, type "sh file -c". You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g.. If this archive is complete, you
# will see the following message at the end:
# "End of shell archive."
# Contents: MANIFEST COPYRIGHT ptyman.doc pty.uu ptydrv.uu ptyman.uu
# tty.uu
# Wrapped by ram@ramsys on Mon Jul 17 00:00:38 1989
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f 'MANIFEST' -a "${1}" != "-c" ; then
echo shar: Will not clobber existing file \"'MANIFEST'\"
else
echo shar: Extracting \"'MANIFEST'\" \(288 characters\)
sed "s/^X//" >'MANIFEST' <<'END_OF_FILE'
X COPYRIGHT -- a copyright notice
X pty.uu -- descriptor for pty-devices
X ptydrv.uu -- dummy driver
X ptyman.doc -- some documentation
X ptyman.uu -- the pty Filemanager
X tty.uu -- descriptor for tty-devices
X
END_OF_FILE
if test 288 -ne `wc -c <'MANIFEST'`; then
echo shar: \"'MANIFEST'\" unpacked with wrong size!
fi
# end of 'MANIFEST'
fi
if test -f 'COPYRIGHT' -a "${1}" != "-c" ; then
echo shar: Will not clobber existing file \"'COPYRIGHT'\"
else
echo shar: Extracting \"'COPYRIGHT'\" \(1562 characters\)
sed "s/^X//" >'COPYRIGHT' <<'END_OF_FILE'
X* This software is copyright (C) 1989 by Reimer Mellin *
X* *
X* Permission is granted to reproduce and distribute *
X* this package by any means so long as no fee is charged *
X* above a nominal handling fee and so long as this *
X* notice is always included in the copies. *
X* Commerical use or incorporation into commercial software *
X* is prohibited without the written permission of the *
X* author. *
X* *
X* Other rights are reserved except as explicitly granted *
X* by written permission of the author. *
X* Reimer Mellin *
X* *
X* Sulenstr.8 *
X* D-8000 Muenchen 71 (Federal Republic of Germany) *
X* *
X* EMAIL: *
X* mellin@lan.informatik.tu-muenchen.dbp.de *
X* ram@altger.UUCP *
X* ....!pyramid!tmpmbx!doitcr!ramsys!ram (home) *
X* *
END_OF_FILE
if test 1562 -ne `wc -c <'COPYRIGHT'`; then
echo shar: \"'COPYRIGHT'\" unpacked with wrong size!
fi
# end of 'COPYRIGHT'
fi
if test -f 'ptyman.doc' -a "${1}" != "-c" ; then
echo shar: Will not clobber existing file \"'ptyman.doc'\"
else
echo shar: Extracting \"'ptyman.doc'\" \(9111 characters\)
sed "s/^X//" >'ptyman.doc' <<'END_OF_FILE'
X Pseudo-Terminal (PTY) File-Manager
X ==================================
XOverview:
X
X Pseudo-Terminals (PTY's) are a kind of Interprocess
XCommunication (IPC), which are known on a wide variety of UN*X
Xcomputers, mostly BSD-like systems. They behave like any other SCF
Xdevices like terminals and printer but are in fact pseudo-devices i.e.
Xexists only in the memory the system.
X
X PTY's have two distinct end-points, namely server-pty and
Xclient-pty, which behaves by default differently. A server-pty
Xsymbolizes the terminal and a client-pty forms the connection to the
Xapplication programs. This implies, that the server-pty provides RAW
Xinput and output whereas the client-pty can handle line-editing, echoing
Xand so on.
X
X With this mechanism many programms can share one real device,
Xlike a real terminal, via one server which multiplexes all connected
Xserver-pty's. Something similar can be reached with the usage of pipes,
Xbut pipes have the disadvantage of being not a tty-device with echo,
Xline-editing, interrupt-chars etc.
X
XExamples:
X - virtual Terminals: one program multiplexes ptys and displays the
X outputs on a real Terminal (there exist a programm called 'screen'
X which does exactly this).
X - In a TCP/IP environment, the program 'rlogin' starts a
X login-process on a pty on the remote machine.
X
X___________________________________________________________________________
X
X /***********\ /**************\
X * * * *
X * Server- * ----------> * real Device *
X * Prg. * * *
X \***********/ \**************/
X ___+ + + +_______
X ___/ \ \ \_______
X ___/ \ \________ \________
X / \ \_______ \__________
X | | | |
X /***********\ /***********\ /***********\ /***********\
X * * * * * * * *
X * 1st Prg. * * 2nd Prg. * * 3rd Prg. * * 4th Prg. *
X * * * * * * * *
X \***********/ \***********/ \***********/ \***********/
X
X'|' meaning client-pty
X'+' meaning server-pty
X
XFig. 1: Typical Server-Client Application
X
X
XImplementation:
X
X With OS9-68000 (OSK) a own File-Manager was written, which
Xhandles both types of PTY's : the client-ptys, and the server-ptys while
Xusing only *one* descriptor (device) for each. Server-ptys must be
Xopened as "/pty/any_valid_name" , client-ttys must be opened (i.e.
Xconnected) with "/tty/any_valid_name". The Open-Call for the client-pty
Xwill block until a server-pty with the same name is opened. PTY's can
Xbe also implemented with the usage of a special device-driver for the
XSCF, but this has serveral draw-backs :
X
X - A System-Global Variable has to be introduced for the rendezvous
X of the PTY-pairs (not implementation independent).
X
X - For each pair of PTY's there must exist two Device-Descriptors
X (waste of memory and Device-Table-entries).
X
X - The number of PTY's pairs are limited !!
X
X - Block-writes in RAW modus has still to be done on a char-by-char
X basis with single calls to the driver, as required by the SCF
X
X When creating a server-PTY the Filemanager searches a list of
Xalready openend server-ptys for the same name. The name can be any
Xlegal OS-9/68000 Filename (no distinction between upper- and
Xlower-case). When a identical name is found, the Filemanager return a
XE_CEF-error (File already exists), otherwise the Pathdescriptor (PD) is
Xinserted into this list and some initialisation is done (allocating
XData-Buffers etc.).
X
X When opening a client-PTY the Filemanager looks thru the above
Xmentioned list for a already openend server-pty. If found, it sets a
Xspecial pointer pointing to the PD of the server-pty. (the Filemanager
Xbasicly distincts server-pty's and client-pty's by the value of this
Xpointer).
X
XRemark:
X There exist only *one* named server-pty but there can be many
X client-ptys listening (although its possibly to I$DUP a
X server-pty-fd).
X
X When closing a Server-Pty, the Filemanager searches for all
Xclient-pty's and sets the special pointer to NULL indicating a
XHANGUP-condition. He also tries to send a SIGHUP-Signal (value is
Xchangeable via the _ss_dcoff()-Call) to the last/current user of a
Xclient-pty. Any further I/O calls to a disconnected client-pty will
Xissue a E_HANGUP-Error.
X
X Closing a client-pty requires no special tasks but clearing all
Xpending Signals (e.g. pending _ss_signl() ), which is done automaticly.
X
X Although total compatibility to a SCF-Device was intended, the
XPTY-Filemanager does differ in some small aspects from the SCF. The
Xreason for that were some features of the SCF, which I do consider
Xfaulty e.g. with a ReadLn-count of one the only character you can read
Xis CR and nothing else (:-( ).
X
XDifferences:
X - a Readln-Call with a character count of 1 will return the next
X character available.
X
X - The Read-Call may behave differently: kbich and kbach will
X abort with the appropriate Error-codes. No Echo, but raw-byte-transfer.
X
X - The Pause-char, Xon-char and Xoff-char are not supported !
X
X - Any signal < 32 and > 1 (SIGWAKE) will abort a pending I/O with an
X error-code of the signal.
X
X - A close of a server-pty will only generate a SIGHUP (see SS_DCOff)
X and will *not* abort the reading processes (the program 'com'
X seems to have problems with that !).
X
X
XDescriptions of operation:
X
X- Read-calls:
X absolute raw-read, ignores echo-parameter, but unterstands kbich and
X kbach.
X
X- Write-calls:
X absolute raw-write ....
X
X- Writeln-calls:
X recognizes upc, tabch, tabs, alf, pause and returns on recognizing
X the eor-char (normaly CR).
X
X- Readln-calls:
X recognition of echo, upc, bso, bse, bspchar, eorchar, alf (when
X echoing), kbich, kbach, eof, delchar, rprchar, dupchar and pause.
XCAVEAT:
X - A final EOR in the input-stream is not necessary and this was
X deliberatly avoided !!!
X - The maximum readln-count is 256 Bytes (like in the SCF). You can
X specify more but the Filemanger will cut it to 256...
X
X- GetStat-calls:
X supported codes are: SS_Opt, SS_Ready, SS_EOF, SS_DevNm (returns the
X name of the pty), SS_BlkRd.
X
X- SetStat-calls:
X supported codes are: SS_Opt, SS_SSig, SS_Relea, SS_EnRTS, SS_DsRTS,
X SS_DCOn, SS_DCOff, SS_BlkWr.
XCAVEAT:
X - SS_DCOn, SS_EnRTS and SS_DsRTS are no-ops.
X
XNot supported are null (for padding), pausechar, xon and xoff.
X
X
XDescription of GetStat-Codes:
X
X - SS_Opt:
X copy the first 28 Bytes of the option part to the users
X (a0)-register.
X
X - SS_Ready:
X return number of chars available for reading in users d1
X register, or return E_NOTRDY if no input is available.
X
X - SS_EOF:
X always returns 0 in callers d1 register (like SCF).
X
X - SS_DevNm:
X return the null-terminated name of the pty into the callers
X (a0)-register.
X
X - SS_BlkRd:
X Read x (in users d2-register) Bytes into buffer, users
X (a0)-register is pointing to.
X
X
XDescription of SetStat-Codes:
X
X - SS_Opt:
X copy the first 28 Byte from users (a0)-register into the option
X part of the pathdescriptor.
X
X - SS_SSig:
X Send signal in users d2-register on receiving the next
X available character. If another Process is waiting for input,
X return an E_NOTRDY error.
X
X - SS_Relea:
X Clear a SS_SSig action...
X
X - SS_EnRTS:
X no-op
X
X - SS_DsRTS:
X no-op
X
X - SS_DCOn:
X no-op
X
X - SS_DCOff:
X Send Signal in users d2-register on closing the server-pty
X (Carrier-lost condition). The Default signal is SIGHUP (Value: 4).
X
X - SS_BlkWr:
X Write x ( in users d2-register ) Bytes from buffer users
X (a0)-register is pointing to.
X
X
XFinal Thoughts:
X
X Some tests have shown, that this Filemanager is about 100%
Xfaster than an orthodox implementation with a special device Driver for
Xthe SCF when doing readln/writeln calls. By using only read/write calls
Xsome can expect even much more throughput (no line-editing stuff etc..).
X
XThings to do:
X - more speed (a factor of 2 seems easily reachable) !
X - shrinking the code
X - treatment of dir-bit as in PipeMan, to see what ptys are open ?
X - more lineediting (emacs-style, history ?)
X - implementing the pausechar and maybe xon/xoff ?
X
XPlease send any suggestions/Bug-reports to:
X Reimer Mellin
X Sulenstr. 8
X D-8000 Muenchen 71
X
X UUCP: mellin@lan.informatik.tu-muenchen.dbp.de (preferred)
X mellin@altger.UUCP
X ....!pyramid!tmpmbx!doitcr!ramsys!ram (home)
END_OF_FILE
if test 9111 -ne `wc -c <'ptyman.doc'`; then
echo shar: \"'ptyman.doc'\" unpacked with wrong size!
fi
# end of 'ptyman.doc'
fi
if test -f 'pty.uu' -a "${1}" != "-c" ; then
echo shar: Will not clobber existing file \"'pty.uu'\"
else
echo shar: Extracting \"'pty.uu'\" \(208 characters\)
sed "s/^X//" >'pty.uu' <<'END_OF_FILE'
X
Xbegin 644 pty
XM2OP``0```'X````!````=@55#P"`````````````````````````````````E
XM`#]>`````````!L`9`!K```````````````<````````````````````````C
XD``````!R`````%!T>4UA;@!0='E$<G8`<'1Y`'!T>0``VA'+D
X``
Xend
Xsize 126
END_OF_FILE
if test 208 -ne `wc -c <'pty.uu'`; then
echo shar: \"'pty.uu'\" unpacked with wrong size!
fi
# end of 'pty.uu'
fi
if test -f 'ptydrv.uu' -a "${1}" != "-c" ; then
echo shar: Will not clobber existing file \"'ptydrv.uu'\"
else
echo shar: Extracting \"'ptydrv.uu'\" \(187 characters\)
sed "s/^X//" >'ptydrv.uu' <<'END_OF_FILE'
X
Xbegin 644 ptydrv
XM2OP``0```&P````!````8`55#@&@````````````````````````````````=
XM`!Y;````/``````````N`%``4`!0`%8`5@!0```````````P/```3G4R/`#0\
X2`#P``4YU4'1Y1')V````&/)TG
X``
Xend
Xsize 108
END_OF_FILE
if test 187 -ne `wc -c <'ptydrv.uu'`; then
echo shar: \"'ptydrv.uu'\" unpacked with wrong size!
fi
# end of 'ptydrv.uu'
fi
if test -f 'ptyman.uu' -a "${1}" != "-c" ; then
echo shar: Will not clobber existing file \"'ptyman.uu'\"
else
echo shar: Extracting \"'ptyman.uu'\" \(8083 characters\)
sed "s/^X//" >'ptyman.uu' <<'END_OF_FILE'
X
Xbegin 644 ptyman
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END_OF_FILE
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# end of 'ptyman.uu'
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echo shar: Extracting \"'tty.uu'\" \(208 characters\)
sed "s/^X//" >'tty.uu' <<'END_OF_FILE'
X
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END_OF_FILE
if test 208 -ne `wc -c <'tty.uu'`; then
echo shar: \"'tty.uu'\" unpacked with wrong size!
fi
# end of 'tty.uu'
fi
echo shar: End of shell archive.
exit 0
---
--
| Reimer Mellin | mellin@lan.informatik.tu-muenchen.dbp.de |
| Sulenstr. 8 | pyramid!tmpmbx!ramsys!ram (home) |
| D-8000 Muenchen 71 | Technische Universitaet Muenchen |