Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
A "signal" is a way for your program to process "asynchronous" events. Meaning that you register a subroutine to be called when that event occurs. When you do this, you don't have to explictly keep checking that a particular event occured, the OS will call the sub when that event occurs.

kill ALRM, $$ doesn't make sense to me!

The below code shows a simple example of a handler for SIGALRM.

#!/usr/bin/perl -w use strict; #$|=1; #see note below... $SIG{'ALRM'} = 'timeout'; alarm(1); while (1){sleep(1);} sub timeout { print "stdout: Alarming!\n"; print STDERR "stderr: Alarming!\n"; exit(0); }; __END__ prints: Note: stderr msg comes first because "autoflush" for stdout wasn't turned on (stdout normally doesn't get "flushed" until program end). $|=1; turns autoflush on. stderr: Alarming! stdout: Alarming!
Kill $some_number makes no sense if $some_number is not a PID. kill ALRM doesn't have a PID. ALRM on my system is "numeric 14", but that is just shorthand for what the string ALRM means.

In reply to Re: Signals in Strawberry Perl: Name or number? by Marshall
in thread Signals in Strawberry Perl: Name or number? by bv

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others examining the Monastery: (8)
As of 2022-05-24 10:04 GMT
Find Nodes?
    Voting Booth?
    Do you prefer to work remotely?

    Results (82 votes). Check out past polls.