Re: [9fans] consterm

["Russ Cox" <rsc@swtch.com>]

On 11/6/07, Eric Van Hensbergen <ericvh@gmail.com> wrote:
> Has anyone done a term program to connect to Plan 9 or Inferno --
> kinda like drawterm, without the draw bits?  I guess I am thinking
> about something that exports /dev/cons, /mnt/term, /dev/audio, etc. --
> but then just runs an rc on the other end instead of rio so I can just
> run it within an xterm (or whatever).  Seems like it would be a useful
> thing to have.

It is trivial to rip the gui out of drawterm and make reads and
writes to /dev/cons redirect to reads and writes on /dev/tty
instead of the graphics console.  Patch below.

There is no p9p cpu, only the very very sketchy beginnings.
You're much better off starting with drawterm, especially if
you want things like /dev/audio.

Russ

diff -c drawterm/Makefile consterm/Makefile
drawterm/Makefile:18,27 - consterm/Makefile:18,23
  	libauthsrv/libauthsrv.a\
  	libsec/libsec.a\
  	libmp/libmp.a\
- 	libmemdraw/libmemdraw.a\
- 	libmemlayer/libmemlayer.a\
- 	libdraw/libdraw.a\
- 	gui-$(GUI)/libgui.a\
  	libc/libc.a\

  # stupid gcc
drawterm/Makefile:55,71 - consterm/Makefile:51,55
  libsec/libsec.a:
  	(cd libsec; $(MAKE))

- libmemdraw/libmemdraw.a:
- 	(cd libmemdraw; $(MAKE))
-
- libmemlayer/libmemlayer.a:
- 	(cd libmemlayer; $(MAKE))
-
- libdraw/libdraw.a:
- 	(cd libdraw; $(MAKE))
-
  libc/libc.a:
  	(cd libc; $(MAKE))
-
- gui-$(GUI)/libgui.a:
- 	(cd gui-$(GUI); $(MAKE))
diff -c drawterm/kern/Makefile consterm/kern/Makefile
drawterm/kern/Makefile:11,23 - consterm/kern/Makefile:11,21
  	devaudio.$O\
  	devaudio-$(AUDIO).$O\
  	devcons.$O\
- 	devdraw.$O\
  	devfs-$(OS).$O\
  	devip.$O\
  	devip-$(OS).$O\
  	devlfd.$O\
  	devmnt.$O\
- 	devmouse.$O\
  	devpipe.$O\
  	devroot.$O\
  	devssl.$O\
drawterm/kern/Makefile:35,41 - consterm/kern/Makefile:33,38
  	sysproc.$O\
  	qio.$O\
  	qlock.$O\
- 	term.$O\
  	uart.$O\
  	waserror.$O\
  	$(OS).$O
diff -c drawterm/kern/devcons.c consterm/kern/devcons.c
drawterm/kern/devcons.c:465,471 - consterm/kern/devcons.c:465,470
  	Qreboot,
  	Qsecstore,
  	Qshowfile,
- 	Qsnarf,
  	Qswap,
  	Qsysname,
  	Qsysstat,
drawterm/kern/devcons.c:499,505 - consterm/kern/devcons.c:498,503
  	"reboot",	{Qreboot},	0,		0664,
  	"secstore",	{Qsecstore},	0,		0666,
  	"showfile",	{Qshowfile},	0,	0220,
- 	"snarf",	{Qsnarf},		0,		0666,
  	"swap",		{Qswap},	0,		0664,
  	"sysname",	{Qsysname},	0,		0664,
  	"sysstat",	{Qsysstat},	0,		0666,
drawterm/kern/devcons.c:510,516 - consterm/kern/devcons.c:508,513

  char secstorebuf[65536];
  Dirtab *secstoretab = &consdir[Qsecstore];
- Dirtab *snarftab = &consdir[Qsnarf];

  int
  readnum(ulong off, char *buf, ulong n, ulong val, int size)
drawterm/kern/devcons.c:607,620 - consterm/kern/devcons.c:604,609
  			memset(secstorebuf, 0, sizeof secstorebuf);
  		break;

- 	case Qsnarf:
- 		if(omode == ORDWR)
- 			error(Eperm);
- 		if(omode == OREAD)
- 			c->aux = strdup("");
- 		else
- 			c->aux = mallocz(SnarfSize, 1);
- 		break;
  	}
  	return c;
  }
drawterm/kern/devcons.c:640,651 - consterm/kern/devcons.c:629,634
  			qhangup(kprintoq, nil);
  		}
  		break;
-
- 	case Qsnarf:
- 		if(c->mode == OWRITE)
- 			clipwrite(c->aux);
- 		free(c->aux);
- 		break;
  	}
  }

drawterm/kern/devcons.c:751,765 - consterm/kern/devcons.c:734,739
  	case Qnull:
  		return 0;

- 	case Qsnarf:
- 		if(offset == 0){
- 			free(c->aux);
- 			c->aux = clipread();
- 		}
- 		if(c->aux == nil)
- 			return 0;
- 		return readstr(offset, buf, n, c->aux);
-
  	case Qsecstore:
  		return readstr(offset, buf, n, secstorebuf);

drawterm/kern/devcons.c:919,931 - consterm/kern/devcons.c:893,898

  	case Qshowfile:
  		return showfilewrite(a, n);
-
- 	case Qsnarf:
- 		if(offset >= SnarfSize || offset+n >= SnarfSize)
- 			error(Etoobig);
- 		snarftab->qid.vers++;
- 		memmove((uchar*)c->aux+offset, va, n);
- 		return n;

  	case Qsysstat:
  		n = 0;
diff -c drawterm/kern/devtab.c consterm/kern/devtab.c
drawterm/kern/devtab.c:9,16 - consterm/kern/devtab.c:9,14
  extern Dev pipedevtab;
  extern Dev ssldevtab;
  extern Dev tlsdevtab;
- extern Dev mousedevtab;
- extern Dev drawdevtab;
  extern Dev ipdevtab;
  extern Dev fsdevtab;
  extern Dev mntdevtab;
drawterm/kern/devtab.c:23,30 - consterm/kern/devtab.c:21,26
  	&pipedevtab,
  	&ssldevtab,
  	&tlsdevtab,
- 	&mousedevtab,
- 	&drawdevtab,
  	&ipdevtab,
  	&fsdevtab,
  	&mntdevtab,
diff -c drawterm/main.c consterm/main.c
drawterm/main.c:9,14 - consterm/main.c:9,16
  char *argv0;
  char *user;

+ void ttyinit(void);
+
  extern int errfmt(Fmt*);
  void
  sizebug(void)
drawterm/main.c:40,57 - consterm/main.c:42,55
  	osinit();
  	procinit0();
  	printinit();
- 	screeninit();

  	chandevreset();
  	chandevinit();
  	quotefmtinstall();
+ 	ttyinit();

  	if(bind("#c", "/dev", MBEFORE) < 0)
  		panic("bind #c: %r");
- 	if(bind("#m", "/dev", MBEFORE) < 0)
- 		panic("bind #m: %r");
- 	if(bind("#i", "/dev", MBEFORE) < 0)
- 		panic("bind #i: %r");
  	if(bind("#I", "/net", MBEFORE) < 0)
  		panic("bind #I: %r");
  	if(bind("#U", "/", MAFTER) < 0)
drawterm/main.c:122,126 - consterm/main.c:120,151
  		return pass;
  	}
  	return nil;
+ }
+
+ #undef read
+ #undef write
+ #undef system
+
+ void
+ ttyputs(char *s, int n)
+ {
+ 	write(1, s, n);
+ }
+
+ void
+ ttyreader(void *arg)
+ {
+ 	char c;
+ 	
+ 	system("stty raw; stty -echo");
+ 	while(read(0, &c, 1) == 1)
+ 		kbdputc(kbdq, c&0xff);
+ }
+
+ void
+ ttyinit(void)
+ {
+ 	screenputs = ttyputs;
+ 	kproc("tty", ttyreader, 0);
  }