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Re: Check for "No child processes" internationally

by davido (Cardinal)
on May 09, 2013 at 06:45 UTC ( [id://1032728]=note: print w/replies, xml ) Need Help??


in reply to Check for "No child processes" internationally

I don't think that "No child process" is locale sensitive, but on some platforms could produce "No children" instead (citation). However, you can ignore the error message's text by remembering that $! is a dual-valued variable; In string context it returns the error message. In numeric context, it returns the error number, which can be tested against the &Errno::ECHILD constant (Errno).

Or you can use %! in some variant on the example code shown in Errno's POD:

# A variation on Errno's POD example:
use Errno qw( ECHILD );

# ........

if ( not close $something ) {
  if( not $!{ECHILD} ) {
    die "Houston, we have a problem: $!";
  }
  else {
    # Silence is golden; ECHILD is silent.
  }
}

[download]

Dave

Replies are listed 'Best First'.
Re^2: Check for "No child processes" internationally
by Anonymous Monk on May 09, 2013 at 06:58 UTC

    # A variation on Errno's POD example: use Errno qw( ECHILD );

    :) Unless you need the number/constant, you don't need to import from Errno

    Also, you don't need to actually use Errno;, using %! in your code will load Errno for you

[reply]
[d/l]

      Thanks for the tips. :)

      The updated code (removed the 'use', and of course the import):

      # A variation on Errno's POD example:

# ........ Do your stuff ........

if ( not close $something ) {
  if( not $!{ECHILD} ) {
    die "Houston, we have a problem: $!";
  }
  else {
    # Silence is golden; ECHILD is silent.
  }
}

      [download]

      Dave

[reply]
[d/l]

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