sleep invokes a wait like
and sets a signal handler for SIGALRM.
But.
is run in a separate child process. So, ctrl/c is sent to the child process not the parent.
It is analagous to running the
command on a huge directory. ctrl/c stops the child
executable image before it dumps 10 zillion files to the screen, not the the parent process.
Lose the sleep command. It looks to me like you are trying out bash coding. ctrl/c only "works" on the parent when the parent is running an actual bash command like some kind of loop. Otherwise repeated ctrl/c keystrokes are required, so that the signal get delivered during the execution of a susceptible piece of code.
Last edited by jim mcnamara; 08-14-2013 at 11:24 AM..
This User Gave Thanks to jim mcnamara For This Post:
hi!!,
i wanna trap all Signal 10, 11, 15 generated by any process running on my server irrespective of the user and wanna write to a log file. Any ideas? Do this script need to be a root process??
:cool: (1 Reply)
Hello all,
I'm hoping to get a little insight from some of the wily veterans amongst you.
I've written a script to check for new outgoing files to our vendors located on our ssl server. It seems to be working ok, but the final question here, will be one of logic, and/or a better way to... (4 Replies)
Hi folks,
I have tried to add some trap detection in the below script....this script is used to monitor database activities...in a rather awkward way :rolleyes:....
The idea behind adding trap is that....this script creates lots of temporary files in the running folder to store the count... (1 Reply)
(posted this in the scripting forum as well, but figured it should go here) So, what's going on is this:
For our program, we had to create our own shell, and if the user pressed ctrl-c just at the cmdline, then this signal would be ignored, but if there is a foreground process running, let's... (0 Replies)
How can use signals in a C program If i want a child program to signal it's parent program that it(child) program has completed the task that it was assigned.:confused: (2 Replies)
Hi all,
I have the c program that c program has to be in sleep mode.
I want write a script the it should trap the signal from the c program.
The signals are sighup,sigkill,sigterm,sigchld and then it has to go to sleep.
If signal is sigchld it has to do to some function.
My question is how to... (3 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
That is the last reply I received from my instructor, and I'm looking for some alternatives.
When using... (2 Replies)
Hi All,
The problem statement is as below:
Problem: A process (exe) is getting executed in background. The output of this process is getting logged in a file. After successfully running for some time the process gets terminated. In the log file following is present:
^M[7m Interrupt ^M[27m... (8 Replies)
let LIMIT=50
function check {
if ]; then
print LIMIT OK
else
print "LIMIT changed!"
fi
}
trap check DEBUG
print $LIMIT
LIMIT=$((LIMIT + 30))
trap - DEBUG
Can anyone tell me how debugging is accomplished?? (4 Replies)
Discussion started by: Karthick N
4 Replies
LEARN ABOUT DEBIAN
io::async::pid
IO::Async::PID(3pm) User Contributed Perl Documentation IO::Async::PID(3pm)NAME
"IO::Async::PID" - event callback on exit of a child process
SYNOPSIS
use IO::Async::PID;
use POSIX qw( WEXITSTATUS );
use IO::Async::Loop;
my $loop = IO::Async::Loop->new;
my $kid = $loop->fork(
code => sub {
print "Child sleeping..
";
sleep 10;
print "Child exiting
";
return 20;
},
);
print "Child process $kid started
";
my $pid = IO::Async::PID->new(
pid => $kid,
on_exit => sub {
my ( $self, $exitcode ) = @_;
printf "Child process %d exited with status %d
",
$self->pid, WEXITSTATUS($exitcode);
},
);
$loop->add( $pid );
$loop->run;
DESCRIPTION
This subclass of IO::Async::Notifier invokes its callback when a process exits.
For most use cases, a IO::Async::Process object provides more control of setting up the process, connecting filehandles to it, sending data
to and receiving data from it.
EVENTS
The following events are invoked, either using subclass methods or CODE references in parameters:
on_exit $exitcode
Invoked when the watched process exits.
PARAMETERS
The following named parameters may be passed to "new" or "configure":
pid => INT
The process ID to watch. Must be given before the object has been added to the containing "IO::Async::Loop" object.
on_exit => CODE
CODE reference for the "on_exit" event.
Once the "on_exit" continuation has been invoked, the "IO::Async::PID" object is removed from the containing "IO::Async::Loop" object.
METHODS
$process_id = $pid->pid
Returns the underlying process ID
$pid->kill( $signal )
Sends a signal to the process
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2012-10-24 IO::Async::PID(3pm)