From uucp Wed Jan 17 01:38 EST 1990 >From ames!amix.commodore.com!ford Wed Jan 17 01:38:12 1990 remote from icus Received: by limbic.UUCP (smail2.5) id AA07620; 17 Jan 90 01:38:12 EST (Wed) Received: by icus.islp.ny.us (smail2.5 ) id AA10114; 17 Jan 90 00:42:04 EST (Wed) Received: by icus.islp.ny.us (smail2.5 ) id AA01433; 16 Jan 90 04:20:35 EST (Tue) Received: from RUTGERS.EDU by ames.arc.nasa.gov (5.61/1.2); Mon, 15 Jan 90 23:29:41 -0800 Received: from cbmvax.UUCP by rutgers.edu (5.59/SMI4.0/RU1.3/3.05) with UUCP id AA18895; Tue, 16 Jan 90 01:58:39 EST Received: by cbmvax.cbm.commodore.com (5.57/UUCP-Project/Commodore Jan 13 1990) id AA01492; Mon, 15 Jan 90 23:01:17 EST Received: by amix.commodore.com (/\=-/\ Smail3.1.17.5 #17.7) id ; Mon, 15 Jan 90 23:00 EST Message-Id: Date: Mon, 15 Jan 90 23:00 EST From: ford@amix.commodore.com (Mike "Ford" Ditto) To: lenny@icus.islp.ny.us Subject: pty driver (Re: Maximum allowed open windows on UNIXPC) Newsgroups: unix-pc.general In-Reply-To: <1067@icus.islp.ny.us> References: <31@suntau.UUCP> Organization: Commodore Amix Development Status: RO In article <1067@icus.islp.ny.us> you write: >In article <31@suntau.UUCP> forrie@suntau.UUCP (Forrie Aldrich) writes: >|>Also: has anyone seen some recent updated version(s) of the PTY package for >|>the 3b1... one that has all (or most) of the bugs weeded out? >|> > >It's available on the ICUS Archives (see previous postings regarding access >to that) in pty.shar.Z. There are no _know_ bugs, at least as far as I know. Although I sent this to Eric, I don't think it ever got posted. Perhaps it deserves a diff against the version you have. I fixed several bugs. -=] Ford [=- #! /bin/sh # This is a shell archive, meaning: # 1. Remove everything above the #! /bin/sh line. # 2. Save the resulting text in a file. # 3. Execute the file with /bin/sh (not csh) to create the files: # Files # INSTALL # Install # Makefile # Name # PTYCNT # README.3b1 # READ_ME # Remove # Size # pty.c # This archive created: Fri Mar 3 01:38:36 1989 export PATH; PATH=/bin:$PATH echo shar: extracting "'Files'" '(52 characters)' if test -f 'Files' then echo shar: will not over-write existing file "'Files'" else cat << \SHAR_EOF > 'Files' Size Install Name Remove Files INSTALL PTYCNT pty.o SHAR_EOF if test 52 -ne "`wc -c < 'Files'`" then echo shar: error transmitting "'Files'" '(should have been 52 characters)' fi fi # end of overwriting check echo shar: extracting "'INSTALL'" '(1582 characters)' if test -f 'INSTALL' then echo shar: will not over-write existing file "'INSTALL'" else cat << \SHAR_EOF > 'INSTALL' MODULE=${1:-pty} LETTER=${2:-p} case "$LETTER" in [a-zA-Z]) : ;; *) echo "second arg must be single letter." 1>&2 exit 1 ;; esac if [ ! -f pty.o ] then echo "you must make pty.o before running INSTALL" 1>&2 exit 1 fi # NOTE!!!!!!!!!!!!!! # To change the number of ptys, change the value in PTYCNT PTYCNT=`sed -n 's/.*PTYCNT//p' PTYCNT` MASTERMINOR=`sed -n 's/.*MASTERMINOR//p' PTYCNT` /etc/masterupd -a -p pty char open release close read write ioctl ${MODULE} # get the assigned device number PTYMAJOR=`/etc/masterupd -c ${MODULE}` if [ $? -ne 0 ] then echo "${MODULE} cannot be added to the /etc/master file" 1>&2 exit 1 fi cp pty.o /etc/lddrv/${MODULE}.o cd /etc/lddrv # allocate and load the module ./lddrv -q ${MODULE} && ./lddrv -d ${MODULE} ./lddrv -a ${MODULE} if [ $? -eq 0 ] then echo "Driver ${MODULE} successfully loaded" else echo "Error: Driver ${MODULE} failed loading stage" 1>&2 exit 1 fi # load the ${MODULE} at boot time echo ${MODULE} >> drivers # make the pty device files in /dev cnt=0 while [ $cnt -lt $PTYCNT ] do for y in 0 1 2 3 4 5 6 7 8 9 a b c d e f do i=$LETTER$y if [ $cnt -ge ${PTYCNT} ] then break fi [ -c /dev/pty$i ] && rm -f /dev/pty$i [ -c /dev/tty$i ] && rm -f /dev/tty$i /etc/mknod /dev/pty$i c ${PTYMAJOR} \ `expr $cnt + $MASTERMINOR` && /etc/mknod /dev/tty$i c ${PTYMAJOR} $cnt || exit 1 chmod 666 /dev/pty$i /dev/tty$i chown root /dev/pty$i /dev/tty$i chgrp root /dev/pty$i /dev/tty$i cnt=`expr $cnt + 1` done LETTER=`echo $LETTER | tr '[a-z][A-Y]' '[b-z][A-Z]'` done SHAR_EOF if test 1582 -ne "`wc -c < 'INSTALL'`" then echo shar: error transmitting "'INSTALL'" '(should have been 1582 characters)' fi chmod +x 'INSTALL' fi # end of overwriting check echo shar: extracting "'Install'" '(437 characters)' if test -f 'Install' then echo shar: will not over-write existing file "'Install'" else cat << \SHAR_EOF > 'Install' # Eric H. Herrin II # University of Kentucky Mathematical Sciences # eric@ms.uky.edu, eric@ms.uky.csnet, !cbosgd!ukma!eric # # Install script for System V Pty driver MODULE=pty ./INSTALL $MODULE || exit 1 cd /etc/lddrv # put an entry in InstDrv for ${MODULE} cat >> InstDrv << EOF Name=Pseudo tty driver File=${MODULE} Comment=Pseudo tty devices /dev/ttyp0 through /dev/ttyqf EOF echo "Pseudo tty drivers are now installed" exit 0 SHAR_EOF if test 437 -ne "`wc -c < 'Install'`" then echo shar: error transmitting "'Install'" '(should have been 437 characters)' fi chmod +x 'Install' fi # end of overwriting check echo shar: extracting "'Makefile'" '(362 characters)' if test -f 'Makefile' then echo shar: will not over-write existing file "'Makefile'" else cat << \SHAR_EOF > 'Makefile' CFLAGS= -O -DLOADABLE ${DEFS} .c.o: ${CC} ${CFLAGS} -c $< pty.o : pty.c PTYCNT all : PTYS+IN install : pty.o ./INSTALL installable : PTYS+IN PTYS+IN : pty.o cpio -oBc < Files > PTYS+IN floppy : PTYS+IN echo "Insert a formatted floppy disk and press return"; read foo dd if=PTYS+IN of=/dev/rfp021 bs=16384 clean : rm pty.o PTYS+IN clobber : clean SHAR_EOF if test 362 -ne "`wc -c < 'Makefile'`" then echo shar: error transmitting "'Makefile'" '(should have been 362 characters)' fi fi # end of overwriting check echo shar: extracting "'Name'" '(18 characters)' if test -f 'Name' then echo shar: will not over-write existing file "'Name'" else cat << \SHAR_EOF > 'Name' Pseudo tty driver SHAR_EOF if test 18 -ne "`wc -c < 'Name'`" then echo shar: error transmitting "'Name'" '(should have been 18 characters)' fi fi # end of overwriting check echo shar: extracting "'PTYCNT'" '(131 characters)' if test -f 'PTYCNT' then echo shar: will not over-write existing file "'PTYCNT'" else cat << \SHAR_EOF > 'PTYCNT' /* be careful; this file is read and used by the INSTALL script */ #define PTYCNT 32 #define MASTERMINOR 128 #define MASTERBIT 128 SHAR_EOF if test 131 -ne "`wc -c < 'PTYCNT'`" then echo shar: error transmitting "'PTYCNT'" '(should have been 131 characters)' fi fi # end of overwriting check echo shar: extracting "'README.3b1'" '(6448 characters)' if test -f 'README.3b1' then echo shar: will not over-write existing file "'README.3b1'" else cat << \SHAR_EOF > 'README.3b1' README: Eric H. Herrin II University of Kentucky Mathematical Sciences Laboratories 915 Patterson Office Tower University of Kentucky Lexington, KY 40506 eric@ms.uky.edu, eric@ms.uky.csnet, !cbosgd!ukma!eric Also modified by: Mike "Ford" Ditto Chief Executive Hacker, Omnicron Data Systems P.O. Box 1721 Bonita, CA 92002 (619) 421-1055 kenobi!ford@crash.CTS.COM, ...!crash!kenobi!ford This directory contains the PD pty driver for System V, modified for use with the AT&T UnixPC or Convergent Technologies Safari 4 computers, running Version 3.51 of the UNIX System V OS (it may also work on earlier versions, but I have no way of verifying this). Anyone using this driver should have no problems, but I will provide no support. Questions should be sent to the above address, either with ground mail or real (e-)mail. This README is intended to mark the changes made to the PD pty driver to satisfy the author's request. It was not easy or feasible to clearly mark every change in the code, thus it was decided that an explanation of the procedure would probably be enough. A brief introduction to UnixPC device drivers is followed by the list of changes made. A couple of hacks will also be explained. NOTE: The #ifdef DEBUG statements use eprintf() instead of printf(). This puts any messages into the queue of system errors of the error icon at the top of the console. UnixPC device drivers: The UnixPC has a different kind of device driver from other System V machines. They can be loaded while the machine is running or at boot time, but are always linked into the OS while the kernel is active. However nice this may be, there ARE some problems. 1. Loadable device drivers CANNOT communicate with one another. That is, one driver cannot use a data structure defined in another driver. 2. Conf.c doesn't exist, it is redone by the /etc/lddrv -av program and relinked into the kernel. Thus, one can't declare common structures this way. Changes to the PD pty driver: The following changes (hacks?) were made to the PD pty driver for the purpose of making it usable on the UnixPC. Problem 1 & 2 influenced me to try to make a single driver (there were two, ptm and pts). How could one do this? My solution (and I would be very interested if you can think of a better one) was to create the slave devices /dev/tty[p-z][0-f] with minor numbers 0-(PTSCNT/2-1) and master devices /dev/pty[p-z][0-f] with minor numbers (PTSCNT/2)-(PTSCNT-1). Major numbers of both types of devices are the same. I can then simply define a macro to determine whether the dev_t passed to the driver was a slave or master pty. Once determined, I can perform the appropriate duties. Also, it was more readable to merge the ptm and pts modules into a single set of pty[open, close, ioctl, read, write] routines. I added a release routine so that the kernel will think the device has properly released if one deallocates the driver. Ford's changes: Master devices now have minor numbers starting at MASTERMINOR regardless of how many pty's are configured. This allows PTYCNT to be changed without having to re-mknod the devices. Also, I renamed PTSCNT to PTYCNT, since it really means the number of pty device pairs rather than the number of slaves. If any ptys are in use, the release routine now returns an EBUSY error, rather than print "panic: page fault in kernel, press reset button to reboot" :-). Closes of master and slave devices are now synchronized properly so that the master doesn't lose data when the slave has closed down, and the slave side does not hang forever on a close when there is buffered data and the master has already closed. Making alterations to the number of ptys, etc. The number of ptys is defined in the file PTYCNT. This number should not exceed MASTERMINOR, which should be defined as the number of minor device numbers possible divided by two. I.e. the Unix PC can only have 256 minor devices for a major device, so this would allow a maximum of 64 ptys. It is currently defined at 32, but I believe this is quite liberal. It is possible to have more than one pty driver installed, so it is possible to have as many ptys as you would ever want. Pty driver generation and installation procedure. Put the number of ptys you want in the file PTYCNT. Run "make". When the make is successful, run "make install" as ROOT. If you would like to make an installable file, run "make installable". The file will be called PTYS+IN. If you would like to make an installable disk, Insert a FORMATTED floppy diskette and type "make floppy" If you would like to have more than PTYCNT ptys, the "INSTALL" (not "Install") script can be run giving it two arguments, a unique name that you would like the module to have instead of "pty", and a letter instead of "p" to start nameing the devices with. For example: ./INSTALL pty0 p ./INSTALL pty1 t ./INSTALL pty1 x This will install three new devices in the kernel, each with its own major number, and create appropriate devices in /dev. The "pty0" module will have devices named "/dev/ttyp0" though "/dev/ttysf", the "pty1" module will have devices named "/dev/ttyt0" through "/dev/ttywf", etc. If you use this multiple driver method, some kernel memory will be used up for each driver installed. Also, running the INSTALL script takes the place of running "make install" as directed above, so don't do both. Acknowledgement: I realize the usage of a single major device number is a severe hack, and I welcome any improvements/solutions. I do not assume any responsibility for the changes I have made, nor do I imply any liability on the part of the original author. I include a complete set of {Install, Remove, etc, etc} scripts so that binary floppies may be made to be installed by the UnixPC user agent. I do not assume any responsibility for these either. Eric H. Herrin II University of Kentucky Mathematical Sciences Laboratories Note -- I totally re-arranged the Install script and many other things, so if something doesn't work, yell at me before yelling at the above named person. -=] Ford [=- kenobi!ford@crash.CTS.COM SHAR_EOF if test 6448 -ne "`wc -c < 'README.3b1'`" then echo shar: error transmitting "'README.3b1'" '(should have been 6448 characters)' fi fi # end of overwriting check echo shar: extracting "'READ_ME'" '(1689 characters)' if test -f 'READ_ME' then echo shar: will not over-write existing file "'READ_ME'" else cat << \SHAR_EOF > 'READ_ME' For the Unix PC, ignore this file, and instead read README.3b1. This is a pseudo tty driver for system V machines. It works very similar to ptys on BSD, for instance emacs works fine. To install this driver you will need to modify your `master' and `dfile' file which contains your driver specifications. As these vary from machine to machine, you will have to look up in your manual how to do that. Here is an example for a sperry s5050 alias ncr tower 32 : Add the following two lines to the driver description section in master: pts 0 237 244 pts 0 0 28 32 0 tty ptm 0 37 344 ptm 0 0 29 0 0 This says there are max 32 pts devices at major number 28 having associated tty structures and 0 ptm devices having major number 29 with no associated data. The number of ptm devices is not configurable, as this depends on the number of pts's. The following two lines go in the dfile: pts 0 0 0 ptm 0 0 0 Probably you will also want to increase the NCLIST parameter. If your configuration procedure is different, you must change the shell script mkpty, which is used to create the device nodes in /dev. The ptm devices (/dev/pty[p-z][0-9a-f]) are the controlling ones, everything written there will show up at the associated pts device (/dev/tty[p-z][0-9a-f]), as well as erverything which is written on the pts device will show up on the ptm device. The pts side will accept the usual termio ioctl calls. The master side is a bit different, as ioctl calls which normally wait for output to drain flush output. The reason for this funny behaviour is that otherwise the master side will hang. Also the master side may be opened only once, further open calls will result in an EBUSY error. SHAR_EOF if test 1689 -ne "`wc -c < 'READ_ME'`" then echo shar: error transmitting "'READ_ME'" '(should have been 1689 characters)' fi fi # end of overwriting check echo shar: extracting "'Remove'" '(461 characters)' if test -f 'Remove' then echo shar: will not over-write existing file "'Remove'" else cat << \SHAR_EOF > 'Remove' # # Eric H. Herrin II # University of Kentucky Mathematical Sciences # eric@ms.uky.edu, eric@ms.uky.csnet, !cbosgd!ukma!eric # # Remove script for pty driver. # remove the pty device files /bin/rm -f /dev/[tp]ty[p-z][0-9a-f] MODULE=pty cd /etc/lddrv ./lddrv -d ${MODULE} /bin/rm -f ${MODULE}.o ${MODULE} ifile.${MODULE} /etc/masterupd -d ${MODULE} /bin/ed - drivers << EOF /^${MODULE}\$/d w EOF /bin/ed - InstDrv << EOF /File=${MODULE}\$/ -1,+1d w EOF SHAR_EOF if test 461 -ne "`wc -c < 'Remove'`" then echo shar: error transmitting "'Remove'" '(should have been 461 characters)' fi fi # end of overwriting check echo shar: extracting "'Size'" '(3 characters)' if test -f 'Size' then echo shar: will not over-write existing file "'Size'" else cat << \SHAR_EOF > 'Size' 16 SHAR_EOF if test 3 -ne "`wc -c < 'Size'`" then echo shar: error transmitting "'Size'" '(should have been 3 characters)' fi fi # end of overwriting check echo shar: extracting "'pty.c'" '(11335 characters)' if test -f 'pty.c' then echo shar: will not over-write existing file "'pty.c'" else cat << \SHAR_EOF > 'pty.c' /* * pty.c - Berkeley style pseudo tty driver for system V * * Copyright (c) 1987, Jens-Uwe Mager, FOCUS Computer GmbH * Not derived from licensed software. * * Permission is granted to freely use, copy, modify, and redistribute * this software, provided that no attempt is made to gain profit from it, * the author is not construed to be liable for any results of using the * software, alterations are clearly marked as such, and this notice is * not modified. */ /* * Modified for use on the UnixPC by: * Eric H. Herrin II * University of Kentucky Mathematical Sciences Laboratories * eric@ms.uky.edu, eric@ms.uky.csnet, !cbosgd!ukma!eric * * Further modified and improved by: * Mike "Ford" Ditto * Chief Executive Hacker, Omnicron Data Systems * ford@kenobi.commodore.com, ...!crash!kenobi!ford * * See README.3b1 for details of port and installation. * * Even further modified for SysVr3 by Ford. */ /* * Define "LOADABLE" if pty should be a Unix-PC-style loadable driver. * Define "SVR3" if on System V Release 3. */ /* The UnixPC does not have any extra bits in t_state, thus * we provide other means of storing the state. */ #define MRWAIT 0x01 /* master waiting in read */ #define t_rloc t_cc[0] /* wchannel for MRWAIT */ #define MWWAIT 0x02 /* master waiting in write */ #define t_wloc t_cc[1] /* wchannel for MWWAIT */ #define MOPEN 0x04 /* master is open */ #define SOPEN 0x08 /* slave is open */ #define KERNEL 1 #define defined_io 1 #include "sys/param.h" #include "sys/types.h" #include "sys/sysmacros.h" #include "sys/systm.h" #include "sys/file.h" #include "sys/conf.h" #ifdef SVR3 #include "sys/immu.h" #include "sys/region.h" #endif #include "sys/proc.h" #include "sys/tty.h" #include "sys/signal.h" #include "sys/dir.h" #include "sys/user.h" #include "sys/errno.h" #include "sys/termio.h" #include "sys/ttold.h" #ifndef L_BUF #define L_BUF 0 /* SVr3 needs this second arg to l_input, */ /* for other systems, 0 shouldn't hurt. */ #endif #include "PTYCNT" /* find out about PTYCNT and MASTERMINOR */ /* PTYCNT is the maximum number of master/slave pairs that will work */ #ifndef PTYCNT #define PTYCNT 32 #endif /* MASTERMINOR is the lowest minor device number for master devices */ #ifndef MASTERMINOR #define MASTERMINOR ((minor(0xFFFF)+1)/2) #endif /* This macro is true if the device number passed corresponds to */ /* the MASTER side of a pty */ #ifdef MASTERBIT #define Master(dev) ((dev)&MASTERBIT) #else #define Master(dev) (minor((dev)) >= MASTERMINOR) #endif /* MASTERBIT */ /* The tty structures must be local to this driver, since there * is no conf.c */ struct tty pts_tty[PTYCNT]; int ptystate[PTYCNT]; int ptsproc(); ptyopen(dev, flag) dev_t dev; int flag; { register struct tty *tp; dev = minor(dev); if (Master(dev)) { # ifdef DEBUG eprintf("open(master): \n"); # endif dev -= MASTERMINOR; tp = &pts_tty[dev]; if (dev >= PTYCNT) { u.u_error = ENXIO; return; } /* * allow only one controlling process */ if (ptystate[dev] & MOPEN) { u.u_error = EBUSY; return; } ptystate[dev] |= MOPEN; tp->t_state |= CARR_ON; if (tp->t_state & WOPEN) { tp->t_state &= ~WOPEN; wakeup((caddr_t)&tp->t_canq); } } else { # ifdef DEBUG eprintf("open(slave): \n"); # endif tp = &pts_tty[dev]; if (dev >= PTYCNT) { u.u_error = ENXIO; return; } if ((tp->t_state & (ISOPEN|WOPEN)) == 0) { ttinit(tp); tp->t_proc = ptsproc; } /* * if master is still open, don't wait for carrier */ if (!(flag & FNDELAY)) { while ((tp->t_state & CARR_ON) == 0) { /* eprintf("slave_open going to sleep!"); */ tp->t_state |= WOPEN; if (sleep((caddr_t)&tp->t_canq, TTIPRI|PCATCH)) { tp->t_state &= ~WOPEN; wakeup((caddr_t)&tp->t_canq); /* eprintf("slave open: interrupted"); */ u.u_error = EINTR; return; } /* eprintf("slave_open woke up! %x %x", tp->t_state, u.u_procp->p_sig); */ } } ptystate[dev] |= SOPEN; (*linesw[tp->t_line].l_open)(tp); } } ptyclose(dev, flag) dev_t dev; int flag; { register struct tty *tp; dev = minor(dev); if (Master(dev)) { # ifdef DEBUG eprintf("close(master): \n"); # endif dev -= MASTERMINOR; tp = &pts_tty[dev]; if (!(ptystate[dev] & SOPEN)) { tp->t_tbuf.c_size -= tp->t_tbuf.c_count; tp->t_tbuf.c_count = 0; tp->t_rbuf.c_size -= tp->t_rbuf.c_count; tp->t_rbuf.c_count = 0; (*linesw[tp->t_line].l_close)(tp); } else { signal(tp->t_pgrp, SIGHUP); ttyflush(tp, FREAD|FWRITE); } /* * virtual carrier gone */ tp->t_state &= ~(CARR_ON); ptystate[dev] &= ~MOPEN; } else { # ifdef DEBUG eprintf("close(slave): \n"); # endif tp = &pts_tty[dev]; if (!(ptystate[dev] & MOPEN)) { tp->t_tbuf.c_size -= tp->t_tbuf.c_count; tp->t_tbuf.c_count = 0; tp->t_rbuf.c_size -= tp->t_rbuf.c_count; tp->t_rbuf.c_count = 0; (*linesw[tp->t_line].l_close)(tp); } ptystate[dev] &= ~SOPEN; if (ptystate[dev] & MRWAIT) { ptystate[dev] &= ~MRWAIT; wakeup((caddr_t)&tp->t_rloc); } if (ptystate[dev] & MWWAIT) { ptystate[dev] &= ~MRWAIT; wakeup((caddr_t)&tp->t_wloc); } } } ptyread(dev) dev_t dev; { register struct tty *tp; register n; dev = minor(dev); if (Master(dev)) { int didsome=0; # ifdef DEBUG eprintf("read(master): \n"); # endif dev -= MASTERMINOR; tp = &pts_tty[dev]; while (u.u_count) { ptsproc(tp, T_OUTPUT); if ((tp->t_state & (TTSTOP|TIMEOUT)) || tp->t_tbuf.c_ptr == NULL || tp->t_tbuf.c_count == 0) { if (didsome) break; if ((ptystate[dev] & SOPEN) == 0) { u.u_error = EIO; return; } if (u.u_fmode & FNDELAY) break; # ifdef DEBUG eprintf("read(master): master going to sleep\n"); # endif ptystate[dev] |= MRWAIT; sleep((caddr_t)&tp->t_rloc, TTIPRI); # ifdef DEBUG eprintf("read(master): master woke up\n"); # endif continue; } n = min(u.u_count, tp->t_tbuf.c_count); if (n) { # ifdef DEBUG eprintf("read(master): got some stuff\n"); # endif ++didsome; if (copyout(tp->t_tbuf.c_ptr, u.u_base, n)) { u.u_error = EFAULT; break; } tp->t_tbuf.c_count -= n; tp->t_tbuf.c_ptr += n; u.u_base += n; u.u_count -= n; } } } else { # ifdef DEBUG eprintf("read(slave): \n"); # endif tp = &pts_tty[dev]; # ifdef DEBUG eprintf("read(slave): got some stuff\n"); # endif (*linesw[tp->t_line].l_read)(tp); } } ptywrite(dev) dev_t dev; { register struct tty *tp; register n; dev = minor(dev); if (Master(dev)) { # ifdef DEBUG eprintf("write(master): \n"); # endif dev -= MASTERMINOR; tp = &pts_tty[dev]; while (u.u_count) { if ((tp->t_state & TBLOCK) || tp->t_rbuf.c_ptr == NULL) { if ((ptystate[dev] & SOPEN) == 0) { u.u_error = EIO; return; } if (u.u_fmode & FNDELAY) break; ptystate[dev] |= MWWAIT; # ifdef DEBUG eprintf("write(master): going to sleep\n"); # endif sleep((caddr_t)&tp->t_wloc, TTOPRI); # ifdef DEBUG eprintf("write: waking up\n"); # endif continue; } n = min(u.u_count, tp->t_rbuf.c_count); if (n) { # ifdef DEBUG eprintf("write(master): sending some stuff\n"); # endif if (copyin(u.u_base,tp->t_rbuf.c_ptr, n)) { u.u_error = EFAULT; break; } tp->t_rbuf.c_count -= n; u.u_base += n; u.u_count -= n; } (*linesw[tp->t_line].l_input)(tp, L_BUF); } } else { # ifdef DEBUG eprintf("write(slave): \n"); # endif tp = &pts_tty[dev]; # ifdef DEBUG eprintf("write(slave): sending some stuff\n"); # endif (*linesw[tp->t_line].l_write)(tp); } } ptyioctl(dev, cmd, arg, mode) dev_t dev; int cmd, arg, mode; { register struct tty *tp; dev = minor(dev); if (Master(dev)) { # ifdef DEBUG eprintf("ioctl(master): \n"); # endif dev -= MASTERMINOR; tp = &pts_tty[dev]; /* * sorry, but we can't fiddle with the tty struct without * having done LDOPEN */ if (tp->t_state & ISOPEN) { if (cmd == TCSBRK && arg == NULL) { signal(tp->t_pgrp, SIGINT); if ((tp->t_iflag & NOFLSH) == 0) ttyflush(tp, FREAD|FWRITE); } else { /* * we must flush output to avoid hang in ttywait */ if (cmd == TCSETAW || cmd == TCSETAF || cmd == TCSBRK || cmd == TIOCSETP) ttyflush(tp, FWRITE); ttiocom(tp, cmd, arg, mode); } } else u.u_error = EINVAL; } else { # ifdef DEBUG eprintf("ioctl(slave): \n"); # endif tp = &pts_tty[dev]; ttiocom(tp, cmd, arg, mode); } } ptsproc(tp, cmd) register struct tty *tp; { register struct ccblock *tbuf; extern ttrstrt(); switch (cmd) { case T_TIME: # ifdef DEBUG eprintf("ptsproc: T_TIME:\n"); # endif tp->t_state &= ~TIMEOUT; goto start; case T_WFLUSH: # ifdef DEBUG eprintf("ptsproc: T_WFLUSH:\n"); # endif tp->t_tbuf.c_size -= tp->t_tbuf.c_count; tp->t_tbuf.c_count = 0; /* fall through */ case T_RESUME: # ifdef DEBUG eprintf("ptsproc: T_RESUME:\n"); # endif tp->t_state &= ~TTSTOP; /* fall through */ case T_OUTPUT: start: # ifdef DEBUG eprintf("ptsproc: T_OUTPUT:\n"); # endif if (tp->t_state & (TTSTOP|TIMEOUT)) break; # ifdef DEBUG eprintf("ptsproc: T_OUTPUT: past(TTSTOP|TIMEOUT)"); # endif tbuf = &tp->t_tbuf; if (tbuf->c_ptr == NULL || tbuf->c_count == 0) { # ifdef DEBUG eprintf("ptsproc: T_OUTPUT: tbuf empty, may break\n"); # endif if (tbuf->c_ptr) tbuf->c_ptr -= tbuf->c_size; if (!(CPRES & (*linesw[tp->t_line].l_output)(tp))) break; } if (tbuf->c_count && (ptystate[tp-pts_tty] & MRWAIT)) { # ifdef DEBUG eprintf("ptsproc: T_OUTPUT: waking up master\n"); # endif ptystate[tp-pts_tty] &= ~MRWAIT; wakeup((caddr_t)&tp->t_rloc); } # ifdef DEBUG eprintf("ptsproc: T_OUTPUT: leaving end\n"); # endif break; case T_SUSPEND: # ifdef DEBUG eprintf("ptsproc: T_SUSPEND:\n"); # endif tp->t_state |= TTSTOP; break; case T_BLOCK: # ifdef DEBUG eprintf("ptsproc: T_BLOCK:\n"); # endif /* * the check for ICANON appears to be neccessary * to avoid a hang when overflowing input */ if ((tp->t_iflag & ICANON) == 0) tp->t_state |= TBLOCK; break; case T_BREAK: # ifdef DEBUG eprintf("ptsproc: T_BREAK:\n"); # endif tp->t_state |= TIMEOUT; timeout(ttrstrt, tp, HZ/4); break; #ifdef T_LOG_FLUSH case T_LOG_FLUSH: #endif case T_RFLUSH: # ifdef DEBUG eprintf("ptsproc: T_RFLUSH:\n"); # endif if (!(tp->t_state & TBLOCK)) break; /* fall through */ case T_UNBLOCK: # ifdef DEBUG eprintf("ptsproc: T_UNBLOCK:\n"); # endif tp->t_state &= ~(TTXOFF|TBLOCK); /* fall through */ case T_INPUT: # ifdef DEBUG eprintf("ptsproc: T_INPUT:\n"); # endif if (ptystate[tp-pts_tty] & MWWAIT) { ptystate[tp-pts_tty] &= ~MWWAIT; # ifdef DEBUG eprintf("ptsproc: T_INPUT: waking up master\n"); # endif wakeup((caddr_t)&tp->t_wloc); } break; default: # ifdef DEBUG eprintf("ptsproc: default:\n"); # else ; # endif } } #ifdef LOADABLE ptyrelease() { register i; # ifdef DEBUG eprintf("ptyrelease:\n"); # endif for ( i=0 ; i