ctrl - c not working in pipe

[peter]

Dear All


ProcessBuilder pb = new ProcessBuilder(bochsPath, "-q", "-f",
"bochsrc.bxrc");
pb.directory(new File("test"));
pb.redirectErrorStream(true);

p = pb.start();
p.getOutputStream.write((byte)0x3); <---- I want to send a SININT,
ctrl -c signal, but not working

thanks
from Peter ([email protected])

 

[Lew]

Dear All


ProcessBuilder pb = new ProcessBuilder(bochsPath, "-q", "-f",
"bochsrc.bxrc");
pb.directory(new File("test"));
pb.redirectErrorStream(true);

p = pb.start();
p.getOutputStream.write((byte)0x3); <---- I want to send a SININT,
ctrl -c signal, but not working

0x3 is just a value - it doesn't trigger a signal unless the OS receives a
command to send a signal. The keyboard driver has a trap to convert "Ctrl-C"
into a signal, which the OS delivers instead of a byte with value 3. What you
did is bypass that mechanism and simply send the byte.

You can see this in Linux or Cygwin or any bash shell environment by entering
the command
$ echo $'\x3'this is a test

That merely sends the byte "0x03" to the output but does not raise the signal
that Ctrl-C would.

I'm sorry; I don't know how to send the signal.

 

[Lew]

0x3 is just a value - it doesn't trigger a signal unless the OS receives
a command to send a signal. The keyboard driver has a trap to convert
"Ctrl-C" into a signal, which the OS delivers instead of a byte with
value 3. What you did is bypass that mechanism and simply send the byte.

You can see this in Linux or Cygwin or any bash shell environment by
entering the command
$ echo $'\x3'this is a test

That merely sends the byte "0x03" to the output but does not raise the
signal that Ctrl-C would.

I'm sorry; I don't know how to send the signal.

Unless you figure out the process id (PID) of the started 'Process' and issue
a "kill -int <PID>" to it.

 

[John B. Matthews]

0x3 is just a value - it doesn't trigger a signal unless the OS
receives a command to send a signal. The keyboard driver has a
trap to convert "Ctrl-C" into a signal, which the OS delivers
instead of a byte with value 3. What you did is bypass that
mechanism and simply send the byte.

You can see this in Linux or Cygwin or any bash shell environment
by entering the command
$ echo $'\x3'this is a test

That merely sends the byte "0x03" to the output but does not raise
the signal that Ctrl-C would.

I'm sorry; I don't know how to send the signal.

Unless you figure out the process id (PID) of the started 'Process'
and issue a "kill -int <PID>" to it.[/QUOTE]

The kill command is a good, general-purpose way to send any signal:

<http://linux.die.net/man/2/kill>

Getting the PID can be cumbersome, and writing the PID to a file may be
convenient. Many system services store the value in /var/log/*.pid. In
this case, I wonder if the OP might simply use p.destroy() instead.

 

[Roedy Green]

p.getOutputStream.write((byte)0x3); <---- I want to send a SININT,
ctrl -c signal, but not working

Other than the problems others have mentioned, a byte can get stuck
because you did not flush, or because the input is blocking. You
really need multiple threads to control a child.

see http://mindprod.com/jgloss/exec.html

 

[peter]

Other than the problems others have mentioned, a byte can get stuck
because you did not flush, or because the input is blocking.  You
really need multiple threads to control a child.

seehttp://mindprod.com/jgloss/exec.html

searched around for several days. Java has no ability to send SIGINT
to other process. Even in visual c++, no way to do it too.
thanks
from Peter

 

[Lew]

searched around for several days. Java has no ability to send SIGINT
to other process. Even in visual c++, no way to do it too.

No direct ability. Java can do it indirectly as described upthread.

 

[Mike Schilling]

searched around for several days. Java has no ability to send SIGINT
to other process

Since SIGINT is OS-specific, that's what you'd expect.

 

[peter]

Since SIGINT is OS-specific, that's what you'd expect.

this is very trouble in windows. I can execute a "kill -2" command.
But in windows, cannot.
I need it to make my bochs gui debugger http://code.google.com/p/peter-bochs
to work in windows.
thanks
from Peter