Define my own signal.

[sanjeeb]

Hi,
We know that there are predefined signals that a process catches when
some interrupt occurs. Can we define our own signals.If i am not
descriptive , i am giving an example .
In SIG hash there is ctrl+C for INT . Suppose i want to define my own
signal which will trigerred when i pressed alt+s. And after that i will
do my desired task through a handler.

With regards
Sanjeeb

 

[Josef Moellers]

Hi,
We know that there are predefined signals that a process catches when
some interrupt occurs. Can we define our own signals.If i am not
descriptive , i am giving an example .
In SIG hash there is ctrl+C for INT . Suppose i want to define my own
signal which will trigerred when i pressed alt+s. And after that i will
do my desired task through a handler.

That's an OS issue.

Signals and the handling of certain key combinations is done by the OS
(at least on Linux it is): the keyboard driver detects that Ctrl and C
are pressed together and sends signal SIGINT to the process.

 

[Ilya Zakharevich]

[A complimentary Cc of this posting was sent to
sanjeeb

Hi,
We know that there are predefined signals that a process catches when
some interrupt occurs. Can we define our own signals.If i am not
descriptive , i am giving an example .
In SIG hash there is ctrl+C for INT . Suppose i want to define my own
signal which will trigerred when i pressed alt+s. And after that i will
do my desired task through a handler.

I think you want some kind of setup of termio/termios (which see). If
your OS and/or CRTL provides such control, you should be able to make
a control char to generate a signal.

Hope this helps,
Ilya

 

[sanjeeb]

[A complimentary Cc of this posting was sent to
sanjeeb

Hi,
We know that there are predefined signals that a process catches when
some interrupt occurs. Can we define our own signals.If i am not
descriptive , i am giving an example .
In SIG hash there is ctrl+C for INT . Suppose i want to define my own
signal which will trigerred when i pressed alt+s. And after that i will
do my desired task through a handler.

I think you want some kind of setup of termio/termios (which see). If
your OS and/or CRTL provides such control, you should be able to make
a control char to generate a signal.

Hope this helps,
Ilya

I am using WINxp. Is there any wayout in XP.
With regards
sanjeeb

 

[Dave]

[A complimentary Cc of this posting was sent to
sanjeeb

Hi,
We know that there are predefined signals that a process catches when
some interrupt occurs. Can we define our own signals.If i am not
descriptive , i am giving an example .
In SIG hash there is ctrl+C for INT . Suppose i want to define my own
signal which will trigerred when i pressed alt+s. And after that i will
do my desired task through a handler.

I think you want some kind of setup of termio/termios (which see). If
your OS and/or CRTL provides such control, you should be able to make
a control char to generate a signal.

Hope this helps,
Ilya

I am using WINxp. Is there any wayout in XP.
With regards
sanjeeb

You could probably do it using a global keyboard hook via the
SetWindowsHookEx function, but that would most likely need to be written in
C not Perl.

 

[xhoster]

Hi,
We know that there are predefined signals that a process catches when
some interrupt occurs. Can we define our own signals.If i am not
descriptive , i am giving an example .

You can't define your own signals, but there are existing signals you can
use for your own purposes.

$ perl -le '$SIG{USR1}=sub {die "USR1!"}; sleep ' &
[1] 25262

$ kill -USR1 25262
USR1! at -e line 1.

In SIG hash there is ctrl+C for INT .

In SIG hash there is INT for INT. That hitting your ctrl+C on your
keyboard causes the shell (or OS) to generate a INT signal is a completely
separate matter.

Suppose i want to define my own
signal which will trigerred when i pressed alt+s.

On linux, I can use Term::ReadKey to detect an alt+s (although it looks
no different than 'esc' followed by s). I could cause it to then
generate a signal for another process. I suppose you can do the same
thing on Windows.

Xho

 

[Charles DeRykus]

[A complimentary Cc of this posting was sent to
sanjeeb

Hi,
We know that there are predefined signals that a process catches when
some interrupt occurs. Can we define our own signals.If i am not
descriptive , i am giving an example .
In SIG hash there is ctrl+C for INT . Suppose i want to define my own
signal which will trigerred when i pressed alt+s. And after that i will
do my desired task through a handler.

I think you want some kind of setup of termio/termios (which see). If
your OS and/or CRTL provides such control, you should be able to make
a control char to generate a signal.

I am using WINxp. Is there any wayout in XP.

Ilya's suggestion may work but I know signal semantics are different...
in Win32 than Unix ... strangely different.

Unix: perl5.8.7 -le '$u1=0;$SIG{USR1} = sub {$u1=1}; kill USR1 => $$;
print $u1'
1

WinXP: 1st try:
perl5.8.8 -le "$u1=0;$SIG{USR1} = sub{$u1=1}; kill USR1 => $$;
print $u1"
Unrecognized signal name "USR1" ...

2nd try:
perl -le "$u1=0; $SIG{USR1} = sub{$u1=1}; kill '-USR1', $$
or die 'kill failed...'; print $u1"
0

Hm, the signal successfully fails...