Beefy Boxes and Bandwidth Generously Provided by pair Networks
Syntactic Confectionery Delight
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
i'm having some issues with subroutines being ran on a forked process. the subroutines have print statements which i would like to have printed to stdout in a format similar to:
"\nthis is my message\n\n"
however, the print format is not as controlled as it is when i do not fork. sometimes my command line is returned before the final print statement in the loop. i'll see my first three prints, and then my command line prompt, with the fourth print statement appearing after the prompt.

do i need a wait() statement? and if so, where? i'm not too familiar with the function. thanks -c

my code:

#!/usr/bin/perl -w use strict; ## declare a pid for forking my $pid; ## loop through devices for my $node(@devices) { ## if child process exists, move to next device if ($pid = fork) { next; ## begin actions within the child process } elsif(defined($pid)) { ## print a message &log_action($node); ## explicit exit for child process exit; } else { die "Cant fork for some reason! : $!\n"; ## endif } ## end of for loop } sub log_action { my $i = shift; print "\nThis message if for node $i.\n\n"; }

Edit by tye to remove tons of trailing spaces from lines


In reply to Understanding how to fork properly. by c

Title:
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 How to display code and escape characters are good places to start.
Log In?
Username:
Password:

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

How do I use this?Last hourOther CB clients
Other Users?
Others musing on the Monastery: (8)
As of 2024-03-28 09:21 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found