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Errno (3)
  • Errno (3) ( Solaris man: Библиотечные вызовы )
  • >> Errno (3) ( Разные man: Библиотечные вызовы )
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    NAME

    Errno - System errno constants
     
    

    SYNOPSIS

        use Errno qw(EINTR EIO :POSIX);
    
    
     

    DESCRIPTION

    "Errno" defines and conditionally exports all the error constants defined in your system "errno.h" include file. It has a single export tag, ":POSIX", which will export all POSIX defined error numbers.

    "Errno" also makes "%!" magic such that each element of "%!" has a non-zero value only if $! is set to that value. For example:

        use Errno;
    
    

        unless (open(FH, "/fangorn/spouse")) {
            if ($!{ENOENT}) {
                warn "Get a wife!\n";
            } else {
                warn "This path is barred: $!";
            } 
        }
    
    

    If a specified constant "EFOO" does not exist on the system, $!{EFOO} returns "". You may use "exists $!{EFOO}" to check whether the constant is available on the system.  

    CAVEATS

    Importing a particular constant may not be very portable, because the import will fail on platforms that do not have that constant. A more portable way to set $! to a valid value is to use:

        if (exists &Errno::EFOO) {
            $! = &Errno::EFOO;
        }
    
    
     

    AUTHOR

    Graham Barr <[email protected]>  

    COPYRIGHT

    Copyright (c) 1997-8 Graham Barr. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    CAVEATS
    AUTHOR
    COPYRIGHT


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