A user of one of my modules (File::Touch) sent me a bug report, complaining that his ActiveState Perl barfed on the following line:

sysopen my $fh,$file,O_WRONLY|O_CREAT|O_NONBLOCK|O_NOCTTY
  or croak("Can't create $file : $!");

[download]

The error message was "Your vendor has not defined Fcntl macro O_NONBLOCK, used at..."

So, I tweaked the code to check whether the Fcntl constant exists in the module's symbol table:

my $SYSOPEN_MODE = O_WRONLY|O_CREAT;
if(exists $Fcntl::{'O_NONBLOCK'}){
    $SYSOPEN_MODE |= &{ $Fcntl::{'O_NONBLOCK'} };
}
if(exists $Fcntl::{'O_NOCTTY'}){
    $SYSOPEN_MODE |= &{ $Fcntl::{'O_NOCTTY'} };
}

[download]

Strangely, the code causes an error at 'exists $Fcntl::{'O_NONBLOCK'}'. The error message is "Your vendor has not defined Fcntl macro O_NONBLOCK, used at File/Touch.pm line 16." The same error occurs with ActiveState 5.8 and 5.10.

Any ideas?

In reply to Fcntl constants missing by nwetters

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