Attempts to perform OPEN, SEEK, TELL or TIEHANDLE operations throws an exception

[catagits/fcgi2.git] / perl / FCGI.pm

package FCGI;
use strict;

BEGIN {
    our $VERSION = '0.74';

    require XSLoader;
    XSLoader::load(__PACKAGE__, $VERSION);
}

sub FAIL_ACCEPT_ON_INTR () { 1 };

sub Request(;***$*$) {
    my @defaults = (\*STDIN, \*STDOUT, \*STDERR, \%ENV, 0, FAIL_ACCEPT_ON_INTR);
    $_[4] = fileno($_[4]) if defined($_[4]) && defined(fileno($_[4]));
    splice @defaults,0,@_,@_;
    &RequestX(@defaults);
}

package FCGI::Stream;
use strict;

sub PRINTF {
  shift->PRINT(sprintf(shift, @_));
}

sub BINMODE {
}

sub READLINE {
    my $stream = shift;
    my ($s, $c);
    my $rs = $/ eq '' ? "\n\n" : $/;
    my $l = substr $rs, -1;
    my $len = length $rs;

    $c = $stream->GETC();
    if ($/ eq '') {
        while ($c eq "\n") {
            $c = $stream->GETC();
        }
    }
    while (defined $c) {
        $s .= $c;
        last if $c eq $l and substr($s, -$len) eq $rs;
        $c = $stream->GETC();
    }
    $s;
}

sub OPEN {
    require Carp;
    Carp::croak(q/Operation 'OPEN' not supported on FCGI::Stream handle/);
}

sub SEEK {
    require Carp;
    Carp::croak(q/Operation 'SEEK' not supported on FCGI::Stream handle/);
}

sub TELL {
    require Carp;
    Carp::croak(q/Operation 'TELL' not supported on FCGI::Stream handle/);
}

sub TIEHANDLE {
    require Carp;
    Carp::croak(q/Operation 'TIEHANDLE' not supported on FCGI::Stream handle/);
}

# Some things (e.g. IPC::Run) use fileno to determine if a filehandle is open,
# so we return a defined, but meaningless value. (-1 being the error return
# value from the syscall in c, meaning it can never be a valid fd no)
# Probably a better alternative would be to return the fcgi stream fd.
sub FILENO { -1 }

1;

=pod

=head1 NAME

FCGI - Fast CGI module

=head1 SYNOPSIS

    use FCGI;

    my $count = 0;
    my $request = FCGI::Request();

    while($request->Accept() >= 0) {
        print("Content-type: text/html\r\n\r\n", ++$count);
    }

=head1 DESCRIPTION

Functions:

=over 4

=item FCGI::Request

Creates a request handle. It has the following optional parameters:

=over 8

=item input perl file handle (default: \*STDIN)

=item output perl file handle (default: \*STDOUT)

=item error perl file handle (default: \*STDERR)

These filehandles will be setup to act as input/output/error
on successful Accept.

=item environment hash reference (default: \%ENV)

The hash will be populated with the environment.

=item socket (default: 0)

Socket to communicate with the server.
Can be the result of the OpenSocket function.
For the moment, it's the file descriptor of the socket
that should be passed. This may change in the future.

You should only use your own socket if your program
is not started by a process manager such as mod_fastcgi
(except for the FastCgiExternalServer case) or cgi-fcgi.
If you use the option, you have to let your FastCGI
server know which port (and possibly server) your program
is listening on.
See remote.pl for an example.

=item flags (default: 0)

Possible values:

=over 12

=item FCGI::FAIL_ACCEPT_ON_INTR

If set, Accept will fail if interrupted.
It not set, it will just keep on waiting.

=back

=back

Example usage:
    my $req = FCGI::Request;

or:
    my %env;
    my $in = new IO::Handle;
    my $out = new IO::Handle;
    my $err = new IO::Handle;
    my $req = FCGI::Request($in, $out, $err, \%env);

=item FCGI::OpenSocket(path, backlog)

Creates a socket suitable to use as an argument to Request.

=over 8

=item path

Pathname of socket or colon followed by local tcp port.
Note that some systems take file permissions into account
on Unix domain sockets, so you'll have to make sure that
the server can write to the created file, by changing
the umask before the call and/or changing permissions and/or
group of the file afterwards.

=item backlog

Maximum length of the queue of pending connections.
If a connection
request arrives with the queue full the client may receive
an  error  with  an  indication of ECONNREFUSED.

=back

=item FCGI::CloseSocket(socket)

Close a socket opened with OpenSocket.

=item $req->Accept()

Accepts a connection on $req, attaching the filehandles and
populating the environment hash.
Returns 0 on success.
If a connection has been accepted before, the old
one will be finished first.

Note that unlike with the old interface, no die and warn
handlers are installed by default. This means that if
you are not running an sfio enabled perl, any warn or
die message will not end up in the server's log by default.
It is advised you set up die and warn handlers yourself.
FCGI.pm contains an example of die and warn handlers.

=item $req->Finish()

Finishes accepted connection.
Also detaches filehandles.

=item $req->Flush()

Flushes accepted connection.

=item $req->Detach()

Temporarily detaches filehandles on an accepted connection.

=item $req->Attach()

Re-attaches filehandles on an accepted connection.

=item $req->LastCall()

Tells the library not to accept any more requests on this handle.
It should be safe to call this method from signal handlers.

Note that this method is still experimental and everything
about it, including its name, is subject to change.

=item $env = $req->GetEnvironment()

Returns the environment parameter passed to FCGI::Request.

=item ($in, $out, $err) = $req->GetHandles()

Returns the file handle parameters passed to FCGI::Request.

=item $isfcgi = $req->IsFastCGI()

Returns whether or not the program was run as a FastCGI.

=back

=head1 LIMITATIONS

FCGI.pm isn't Unicode aware, only characters within the range 0x00-0xFF are 
supported. Attempts to output strings containing characters above 0xFF results
in a exception: (F) C<Wide character in %s>.

Users who wants the previous (FCGI.pm <= 0.68) incorrect behavior can disable the
exception by using the C<bytes> pragma.

    {
        use bytes;
        print "\x{263A}";
    }


=head1 AUTHOR

Sven Verdoolaege <skimo@kotnet.org>

=cut

__END__