mailing-list for TeXmacs Users

[Nicola Mingotti <address@hidden>]

Hello Max,

I have had finally time to do further experiments.

I tried your test plugin, in my system (FreeBSD 11.2, Texmacs v. 1.99.4 
from ports) it works
with and without your patch. Quite misteriously i must say.

My plugin instead keeps on not working and not receiving SIGINT.

I start to doubt i have a bug in my code somewhere, but it is wired,
if I run my plugin on the console it behaves well on Ctrl-C !

I have discovered something that is interesting.

If I run:
$> truss ./texmacs -x '(make-session "ruby" "default")' 2>&1 | grep '^kill'

I get this stuff :
kill(-59846,SIGINT)   # ERR3, no such process

... i have never seen a negative pid in life.

I tried to change TeXmacs code you modified many times, but it seems the 
damn negative
pid not going to change, whatever i do, eg :
---
  Q_PID pid = PipeLink.pid ();
  int ret =  ::kill(-pid, SIGINT);
---

A different but still negative pid appears to be sent to your plugin,
but, for some reason, your plugin gets the SIGINT.

I am extremely puzzled,
do you have any idea ?

bye
n.


On 12/12/18 8:56 AM, Massimiliano Gubinelli wrote:
> Hi again,
>    
>
> > On 11. Dec 2018, at 20:11, Nicola Mingotti <address@hidden> wrote:
> >
> > Hi again,
> >
> > I am puzzled, I am trying to get the SIGINT from my plugin
> > but it seems to me TeXmacs is not sending that signal.
>
> Seems there is a bug with the signals. I attach a patch and a test program 
> (which has to be installed as a plugin).
>
> I will commit a patch in svn.
>
> Best
> Max
>
>
> -----------------------------------------------------------------------
> The patch
> -8<---------------------------------------------------------------------
> Index: src/Plugins/Qt/qt_pipe_link.cpp
> ===================================================================
> --- src/Plugins/Qt/qt_pipe_link.cpp     (revision 11316)
> +++ src/Plugins/Qt/qt_pipe_link.cpp     (working copy)
> @@ -148,7 +148,11 @@
>     qt_error << "SIGINT not implemented on Windows\n";
>   #else
>     Q_PID pid = PipeLink.pid ();
> -  int ret =  ::killpg (pid, SIGINT);
> +
> +  // REMARK: previously there were here below a call to ::killpg which does 
> not seems to work on MacOS
> +  // I (mgubi) replaced it with ::kill which does the job. But I do not 
> undestand the difference.
> +
> +  int ret =  ::kill (pid, SIGINT);
>     if (ret == -1) {
>       qt_error << "Interrupt not successful, pid: " << pid << " return code: " << errno 
> << "\n";
>     }
> -8<--------------------------------------------------------------------
> The test program
> -8<--------------------------------------------------------------------
> #include <iostream>
> #include <unistd.h>
> #include <csignal>
>
> using namespace std;
>
> #define DATA_BEGIN   ((char) 2)
> #define DATA_END     ((char) 5)
> #define DATA_ESCAPE  ((char) 27)
>
> bool trig = true;
> int cc = 0;
>
> void signalHandler( int signum ) {
>      trig = false;
> }
>
> int
> main () {
>    cout << DATA_BEGIN << "verbatim:";
>    cout << "STARTING\n";
>    cout << DATA_END;
>    cout.flush ();
>
>    // register signal SIGINT and signal handler
>    signal(SIGINT, signalHandler);
>
>      while (1) {
>          char buffer[100];
>          cin.getline (buffer, 100, '\n');
>          cout << DATA_BEGIN << "verbatim:";
>          cout << "Input: " << buffer << "\n";
>          cout.flush ();
>
>          while (trig) {
>              cout << "Going to sleep.... (" << cc ++ << ")\n";
>              cout.flush ();
>              sleep (1);
>          }
>          cout << DATA_END;
>          cout.flush ();
>          trig = true; cc = 0;
>      }
>    return 0;
> }
> -8<--------------------------------------------------------------------
>
>
> > I am using TeXmacs version 1.99.4 in FreeBSD.
> >
> > Do you know of any plugin who is actually managing SIGINT correctly ?
> > I tried Python (not working, not implemented IFACSay), Scheme (no button), 
> > Maxima (not working).
> >
> > I test the SIGINT is not working in this way, for Python i can actually
> > check there is not signal receiver in the code, so, not a TeXmacs problem, 
> > but the method I use in general is:
> >
> > 1] Run a sleep command, 10 seconds
> > 2] Press the STOP button in TeXmacs
> > 3] Run a simple arithmentic command e.g. 1+1
> >
> > === Pyjhon ===
> > > import time
> > > timp.sleep(10)
> > PRESS QUIT
> > > 1+1
> > HANGS till end of sleep
> > =============
> >
> > ==== Maxima ====
> > > :lisp (sleep 10)
> > PRESS QUIT
> > > 1
> > HANGS till end of sleep
> > ================
> >
> > Maybe also Maxima plugin is not catching the SIGINT...
> > In my plugin managed to receive the signal but I don't see it coming when i 
> > press the STOP button.
> >
> > Do you know something about it ?
> >
> > bye
> > Nicola