f

#### How to open a pty from Tcl (or "please translate C example to Tcl")

Hello out there,
still struggling with getting TCP/IP to work in my somewhat bizarre
setup (TCP/IP over 10.000 Volt power-line modems) I got a hint to try
to use a pseudo tty. I got the advice
---
What you would do is write a small C program (or perl, or any of a
number of other languages).  This program would call the "openpty"
function, which:
-  Locates the next available (unused) pseudo-TTY device in the
system,
-  Opens both ends of it, into two different descriptors,
-  Returns the file-descriptor numbers for the two ends (the "slave"
end which mimics a tty, and the master end that your program will
be using as the intercept point), and the filename of the slave
(e.g. "/dev/ptya0").
---
Q1: Any way I could accomplish this from Tcl?

Well, knowing nothing about openpty and pseude ttys I hunted around
and found the following code snippet:
---
/*
* Allocate pseudo tty, returns master side fd.
* Stores slave name in the first arg(must be large enough).
*/
int pty_open(char *sl_name)
{
int  mr_fd;

char ptyname[] = "/dev/ptyXY";
char ch[] = "pqrstuvwxyz";
char digit[] = "0123456789abcdefghijklmnopqrstuv";
int  l, m;

/* This algorithm should work for almost all standard Unices */
for(l=0; ch[l]; l++ ) {
for(m=0; digit[m]; m++ ) {
ptyname[8] = ch[l];
ptyname[9] = digit[m];
/* Open the master */
if( (mr_fd=open(ptyname, O_RDWR)) < 0 )
continue;
/* Check the slave */
ptyname[5] = 't';
if( (access(ptyname, R_OK | W_OK)) < 0 ){
close(mr_fd);
ptyname[5] = 'p';
continue;
}
strcpy(sl_name,ptyname);
return mr_fd;
}
}
return -1;
}
---
Now this looks like it could be easily mimicked in Tcl (where it not
for one small detail):
- The code tries out all pty's in ascending order of their names.
- If it can open one it "checks" (as per the comment above) the
corresponding 'tty' (by temporarily changing ptyXY to ttyXY) via a
call to 'access' on this tty - and here I'm lost. I don't know much
more about Linux than to boot it (needn't to - got Tcl).

Q2: What does 'access(<name of tty>, ...) do and how could I
accomplish the same from Tcl?

Q3: Any other way to get my hands on a pseudy tty from within Tcl?

Any links or hints most heartily welcomed - this project starts to
tear on my nerves a little bit. Best regards
Helmut Giese

 0
hgiese (1076)
3/5/2005 9:57:58 PM
comp.lang.tcl 23429 articles. 2 followers.

3 Replies
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On the off chance that another Tcl'er might one day feel the urge for
a pseudo tty, here's the solution. By chance I found out that 'access'
is not just a function in a run time library but also available as
stand-alone program (at least on my SUSE 9.1 Linux).
---
#
# Open a pseudo tty
#
# On success returns a list <file descriptor to master / name of
slave>, else
# returns empty list
#
# The algorithm is modelled after the one found in pty_dev.c from
#       VTun - Virtual Tunnel over TCP/IP network.
#       by Maxim Krasnyansky <max_mk@yahoo.com>
#
proc ptyOpen {} {
set ptyBase "/dev/pty"
set ttyBase "/dev/tty"
set chX     "abcdepqrstuvwxyz"  ;# check in /dev which letters
will fit
set digit   "0123456789abcdef"

# This algorithm should work for almost all standard Unices
foreach ch [split $chX ""] { foreach dig [split$digit ""] {
set ptyName ${ptyBase}${ch}${dig} # Open the master if { [catch {open$ptyName w+} masterFd] } {
continue
}
# open successful: check the slave using 'access'
set slvName ${ttyBase}${ch}${dig} if { [catch {exec access -rw$slvName}] } {
# no
close $masterFd continue; } # success return [list$masterFd $slvName] } } return [list] } --- Have fun - probably in a somewhat bizarre set of circumstances ... Helmut Giese   0 hgiese (1076) 3/6/2005 9:18:06 PM The phrase "almost all standard Unices" is misleading as there is no standard for pty access. If you look at the pty allocation code in Expect, you'll find that there are a LOT more cases to handle other systems and all sorts of special circumstances, for example, if the pty is uninitialized or wedged in to some odd state or ownership. Don hgiese@ratiosoft.com (Helmut Giese) writes: > On the off chance that another Tcl'er might one day feel the urge for > a pseudo tty, here's the solution. By chance I found out that 'access' > is not just a function in a run time library but also available as > stand-alone program (at least on my SUSE 9.1 Linux). > --- > # > # Open a pseudo tty > # > # On success returns a list <file descriptor to master / name of > slave>, else > # returns empty list > # > # The algorithm is modelled after the one found in pty_dev.c from > # VTun - Virtual Tunnel over TCP/IP network. > # by Maxim Krasnyansky <max_mk@yahoo.com> > # > proc ptyOpen {} { > set ptyBase "/dev/pty" > set ttyBase "/dev/tty" > set chX "abcdepqrstuvwxyz" ;# check in /dev which letters > will fit > set digit "0123456789abcdef" > > # This algorithm should work for almost all standard Unices > foreach ch [split$chX ""] {
>         foreach dig [split $digit ""] { > set ptyName${ptyBase}${ch}${dig}
>             # Open the master
>             if { [catch {open $ptyName w+} masterFd] } { > continue > } > # open successful: check the slave using 'access' > set slvName${ttyBase}${ch}${dig}
>             if { [catch {exec access -rw $slvName}] } { > # no > close$masterFd
>                 continue;
>             }
>             # success
>             return [list $masterFd$slvName]
>         }
>     }
>     return [list]
> }
> 	---
> Have fun - probably in a somewhat bizarre set of circumstances ...
> Helmut Giese

 0
libes (272)
3/9/2005 6:36:59 PM
On 09 Mar 2005 13:36:59 -0500, Don Libes <libes@nist.gov> wrote:

>The phrase "almost all standard Unices" is misleading as there is no
>standard for pty access.  If you look at the pty allocation code in
>Expect, you'll find that there are a LOT more cases to handle other
>systems and all sorts of special circumstances, for example, if the
>pty is uninitialized or wedged in to some odd state or ownership.
>
Hi Don,
thanks for the clarification - others may find it helpful. This
comment was not strictly mine, it came from the original C sources.
Me, I wouldn't have _any_ opinion on any Unix whatsoever - being a
Windows man who currently happens to have the tough luck to tackle
rather low-level Linux questions.
Best regards
Helmut Giese

 0
hgiese (1076)
3/9/2005 9:04:26 PM

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Tcl 8,5 tutorial errata on page "More Examples Of Regular Expressions"
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On Tuesday, 12 November 2013 08:43:08 UTC+11, dor...@gmail.com wrote: > Hi, >=20 >=20 >=20 > In the Tcl 8.5 tutorial, a page titled "More Examples Of Regular Expressi= ons" may contain errata in the following Tcl code: >=20 >=20 >=20 > " >=20 >=20 >=20 > set string "Again and again and again ..." >=20 > if { [regexp {(\y\w+\y).+\1}$string =3D> word] } { >=20 > puts "The word $word occurs at least twic... tcl 8.5.2 gives error on runtime arg "-c" Hi. I'm getting this error when launching a tcl script from a shell with "-c some_argument" with tcl 8.5.2 Application initialization failed: bad window path name "some_argument" I've searched the manpage and several documentation sources and have not found any restrictions over supplying runtime flag/arguments. Is this a bug or a hidden feature? dewuf wrote: > Hi. I'm getting this error when launching a tcl script from a shell > with "-c some_argument" with tcl 8.5.2 > > Application initialization failed: bad window path name > "some_argument" > > I've searched the manpage and several documentation sources and have > not found any restrictions over supplying runtime flag/arguments. Is > this a bug or a hidden feature? see http://www.tcl.tk/man/tcl8.5/UserCmd/wish.htm use a -- to prevent the interp from even looking at the options Bruce On Feb 9, 2:36=A0pm, Bruce Hartweg <Bruce-DoNot...@example.com> wrote: > dewuf wrote: > > Hi. =A0I'm getting this error when launching a tcl script from a shell > > with "-c some_argument" with tcl 8.5.2 > > > Application initialization failed: bad window path name > > "some_argument" > > > I've searched the manpage and several documentation sources and have > > not found any restrictions over supplying runtime flag/arguments. =A0Is > > this a bug or a hidden featu... Intriguing reference to "TclDOM example directory" at http://wiki.tcl.tk/3895 I'm looking for examples of code involving parsing XML and/or HTML documents. In the 4th from last entry, Mr. Ball makes reference to "the TclDOM example directory". Where might I find that directory? TIA On Feb 15, 11:59=A0am, Richard Owlett <rowl...@pcnetinc.com> wrote: > In the 4th from last entry (of < http://wiki.tcl.tk/3895 >), Mr. Ball mak= es reference to "the > TclDOM example directory". > > Where might I find that directory? On http://wiki.tcl.tk/1407 , the same writer says: Version 2.5 of TclDOM adds a couple of new example scripts that may be useful: domtext: displays a DOM document in a Tk Text widget domtree: displays a DOM document's tree structure in a BWidget Tree widget. Version 3.0 includes the source script for tkxmllint (http:// tclxml.sourceforge.net/tkxmllint.html) application. Larry W. Virden wrote: > On Feb 15, 11:59 am, Richard Owlett <rowl...@pcnetinc.com> wrote: >> In the 4th from last entry (of < http://wiki.tcl.tk/3895 >), Mr. Ball makes reference to "the >> TclDOM example directory". >> >> Where might I find that directory? > > On http://wiki.tcl.tk/1407 , the same writer says: > Version 2.5 of TclDOM adds a couple of new example scripts that may be > useful: > domtext: displays a DOM document in a Tk Text widget > domtree: displays a DOM document's tree structure in a > BWidget ... problem with "sorting" in tcl Hi, Not a master of tcl, I would like to find a solution to the following problem asap. I want to sort a list of numbers. Please see this code ################## set bw [list] set b 6 puts "length: [llength$bw]" for {set i 0} {$i <$b } {incr i} { lappend bw [expr $b-$i] } puts "length: [llength $bw]" lsort -real$bw puts "list is: $bw" ################### Problem: I expect (and I need) that it should give the list as 1 2 3 4 5 6 but the output produced is length: 0 length: 6 list is: 6 5 4 3 2 1 Can anyone advice on what do I need to do so that after sorting the output is "sorted" really..?? thank you. On 2006-03-13, Kamal <kamal.program@gmail.com> wrote: > lsort -real$bw Here's your problem. The lsort man page states: This command sorts the elements of list, returning a new list in sorted order. You're sorting the contents of variable "bw" as a list -- and throwing the sorted list (ie. the return value) away. The above should read: set bw [lsort -real \$bw] Also, you don't actually need the "-real" option here, unless you're expecting floating-point values. "-integer" works just fine for the example dataset you presented. - Adrian Kamal wrote: > Hi, > Not a master of tcl, I would like to find a solution to the following > problem asap. I want to sort a list of numbers. Please see this code > > ################## > set bw [list] > se...

Are Tcl and Tk "inseparable"?
Hi, I am a Ruby user and probably I will have to use Tk in order to get nice GUIs. Now, the problem is that: Learning a new language (Ruby) is already time consuming enough. Do I have to learn also Tcl in order to use Tk? Can't I use Tk alone? (Umm, well, not so alone, together with Ruby, I mean) Thanks in advance. Surgeon schrieb: > Hi, > > I am a Ruby user and probably I will have to use Tk in order to get > nice GUIs. Now, the problem is that: Learning a new language (Ruby) is > already time consuming enough. Do I have to learn also Tcl in order to > use Tk? Can't I use Tk alone? (Umm, well, not so alone, together with > Ruby, I mean) The Perl community ripped Tcl from their PerlTk package, but it was just slower, less up to date and more memory hungry. So in principle one could separate Tk from Tcl, but its not worth it. But your question goes in a different direction: The Ruby/Tk binding wraps Tk into a set of Ruby Objects, so you are using Ruby when you create Ruby/Tk programs. So you do not need to learn Tcl to be able to use RubyTk, but it could help in translating advanced Tk examples found on the Tcl'ers wiki (http://wiki.tcl.tk). But you have to learn the options and functions of your libraries, as you have to do for any other package. Michael Surgeon <biyokuantum@gmail.com> wrote: > Hi, > I am a Ruby user and probably I will have to use Tk in order > to get nice GUIs. Now, the problem is that: Learning a ...

"Sayonara Tcl/Tk"
It seems that someone is really upset about Tcl/Tk. http://forum.sqlitestudio.pl/viewtopic.php?f=16&t=333 Στις 29/4/2013 11:49, ο/η saxo3800@gmail.com έγραψε: > It seems that someone is really upset about Tcl/Tk. > > http://forum.sqlitestudio.pl/viewtopic.php?f=16&t=333 > I think that he has a point regarding threads. George On Apr 29, 11:02=C2=A0am, Georgios Petasis <peta...@iit.demokritos.gr> wrote: > =CE=A3=CF=84=CE=B9=CF=82 29/4/2013 11:49, =CE=BF/=CE=B7 saxo3...@gmail.co= m =CE=AD=CE=B3=CF=81=CE=B1=CF=88=CE=B5: > > > It seems that someone is really upset about Tcl/Tk. > > >http://forum.sqlitestudio.pl/viewtopic.php?f=3D16&t=3D333 > > I think that he has a point regarding threads. Sure. Though I'm curious to know what specific problem of his is so much better served by explicit locks and shared vars than by message passing, given the context. It's not as if he was worried by lost nanoseconds in mutex contention. -Alex Στις 29/4/2013 20:07, ο/η Alexandre Ferrieux έγραψε: > On Apr 29, 11:02 am, Georgios Petasis <peta...@iit.demokritos.gr> > wrote: >> Στις 29/4/2013 11:49, ο/η saxo3...@gmail.com έγραψε: >> >>> It seems that someone is really upset about Tcl/Tk. >> >>> http://forum.sqlitestudio.pl/viewtopic.php?f=16&t=333 >> >> I think that he has a point regarding threads. > > Sure. Though I'...

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