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and subroutines altered with C<autodie> will only change their behaviour
until the end of the enclosing block, file, or C<eval>.

If C<system> is specified as an argument to C<autodie>, then it
uses L<IPC::System::Simple> to do the heavy lifting.  See the
description of that module for more information.

=head1 EXCEPTIONS

Exceptions produced by the C<autodie> pragma are members of the
L<autodie::exception> class.  The preferred way to work with
these exceptions under Perl 5.10 is as follows:

    eval {
        use autodie;

        open(my $fh, '<', $some_file);

        my @records = <$fh>;

        # Do things with @records...

        close($fh);
    };

    if ($@ and $@->isa('autodie::exception')) {
        if ($@->matches('open')) { print "Error from open\n";   }
        if ($@->matches(':io' )) { print "Non-open, IO error."; }
    } elsif ($@) {
        # A non-autodie exception.
    }

See L<autodie::exception> for further information on interrogating
exceptions.

=head1 CATEGORIES

Autodie uses a simple set of categories to group together similar
built-ins.  Requesting a category type (starting with a colon) will
enable autodie for all built-ins beneath that category.  For example,
requesting C<:file> will enable autodie for C<close>, C<fcntl>,
C<open> and C<sysopen>.

The categories are currently:

    :all
        :default
            :io
                read
                seek
                sysread
                sysseek
                syswrite
                :dbm
                    dbmclose
                    dbmopen
                :file
                    binmode
                    close
                    chmod
                    chown
                    fcntl
                    flock
                    ioctl
                    open
                    sysopen
                    truncate
                :filesys
                    chdir
                    closedir
                    opendir
                    link
                    mkdir
                    readlink
                    rename
                    rmdir
                    symlink
                    unlink
                :ipc
                    kill
                    pipe
                    :msg
                        msgctl
                        msgget
                        msgrcv
                        msgsnd
                    :semaphore
                        semctl
                        semget
                        semop
                    :shm
                        shmctl
                        shmget
                        shmread
                :socket
                    accept
                    bind
                    connect
                    getsockopt
                    listen
                    recv
                    send
                    setsockopt
                    shutdown
                    socketpair
            :threads
                fork
        :system
            system
            exec


Note that while the above category system is presently a strict
hierarchy, this should not be assumed.

A plain C<use autodie> implies C<use autodie qw(:default)>.  Note that
C<system> and C<exec> are not enabled by default.  C<system> requires
the optional L<IPC::System::Simple> module to be installed, and enabling
C<system> or C<exec> will invalidate their exotic forms.  See L</BUGS>
below for more details.