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|
package Fuse;
use 5.006;
use strict;
use warnings;
use Errno;
use Carp;
require Exporter;
require DynaLoader;
use AutoLoader;
use Data::Dumper;
our @ISA = qw(Exporter DynaLoader);
# Items to export into callers namespace by default. Note: do not export
# names by default without a very good reason. Use EXPORT_OK instead.
# Do not simply export all your public functions/methods/constants.
# This allows declaration use Fuse ':all';
# If you do not need this, moving things directly into @EXPORT or @EXPORT_OK
# will save memory.
our %EXPORT_TAGS = ( 'all' => [ qw(
FUSE_DEBUG
) ] );
our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );
our @EXPORT = qw(
FUSE_DEBUG
);
our $VERSION = '0.01';
sub AUTOLOAD {
# This AUTOLOAD is used to 'autoload' constants from the constant()
# XS function. If a constant is not found then control is passed
# to the AUTOLOAD in AutoLoader.
my $constname;
our $AUTOLOAD;
($constname = $AUTOLOAD) =~ s/.*:://;
croak "& not defined" if $constname eq 'constant';
my $val = constant($constname, @_ ? $_[0] : 0);
if ($! != 0) {
if ($!{EINVAL}) {
$AutoLoader::AUTOLOAD = $AUTOLOAD;
goto &AutoLoader::AUTOLOAD;
}
else {
croak "Your vendor has not defined Fuse macro $constname";
}
}
{
no strict 'refs';
# Fixed between 5.005_53 and 5.005_61
if ($] >= 5.00561) {
*$AUTOLOAD = sub () { $val };
}
else {
*$AUTOLOAD = sub { $val };
}
}
goto &$AUTOLOAD;
}
bootstrap Fuse $VERSION;
sub main {
my (@subs) = (0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0);
my (@names) = qw(getattr readlink getdir mknod mkdir unlink rmdir symlink rename link chmod chown truncate utime open read write);
my ($tmp) = 0;
my (%mapping) = map { $_ => $tmp++ } (@names);
my (%otherargs) = (debug=>0, threaded=>1, mountpoint=>"");
while(my $name = shift) {
my ($subref) = shift;
if(exists($otherargs{$name})) {
$otherargs{$name} = $subref;
} else {
croak "There is no function $name" unless exists($mapping{$name});
croak "Usage: Fuse::main(getattr => &my_getattr, ...)" unless $subref;
croak "Usage: Fuse::main(getattr => &my_getattr, ...)" unless ref($subref);
croak "Usage: Fuse::main(getattr => &my_getattr, ...)" unless ref($subref) eq "CODE";
$subs[$mapping{$name}] = $subref;
}
}
perl_fuse_main($0,$otherargs{threaded},$otherargs{debug},$otherargs{mountpoint},@subs);
}
# Autoload methods go after =cut, and are processed by the autosplit program.
1;
__END__
=head1 NAME
Fuse - write filesystems in Perl using FUSE
=head1 SYNOPSIS
use Fuse;
my ($mountpoint) = "";
$mountpoint = shift(@ARGV) if @ARGV;
Fuse::main(mountpoint=>$mountpoint,getattr=>\&my_getattr,getdir=>\&my_getdir, ...);
=head1 DESCRIPTION
This lets you implement filesystems in perl, through the FUSE (Filesystem in USErspace) kernel/lib interface.
FUSE expects you to implement callbacks for the various functions.
NOTE: I have only tested the things implemented in example.pl! It should work, but some things may not.
In the following definitions, "errno" can be 0 (for a success), -EINVAL, -ENOENT, -EONFIRE, any integer less than 1 really.
You can import standard error constants by saying something like "use POSIX qw(EDOTDOT ENOANO);".
=head2 FUNCTIONS
=head3 getattr
Arguments: filename.
Returns a list, one of the following 4 possibilities:
$errno or
($blocks,$size,$gid,$uid,$nlink,$modes,$time) or
($errno,$blocks,$size,$gid,$uid,$nlink,$modes,$time) or
($errno,$blksize,$blocks,$size,$gid,$uid,$nlink,$modes,$time)
B<FIXME>: device numeric, for filesystems that implement mknod?
=head3 readlink
Arguments: link pathname.
Returns a scalar: either a numeric constant, or a text string.
=head3 getdir
Arguments: Containing directory name.
Returns a list: 0 or more text strings (the filenames), followed by errno (usually 0).
=head3 mknod
Arguments: Filename, numeric modes, numeric device
Returns an errno (0 upon success, as usual).
=head3 mkdir
Arguments: New directory pathname, numeric modes.
Returns an errno.
=head3 unlink
Arguments: Filename.
Returns an errno.
=head3 rmdir
Arguments: Pathname.
Returns an errno.
=head3 symlink
Arguments: Existing filename, symlink name.
Returns an errno.
=head3 rename
Arguments: old filename, new filename.
Returns an errno.
=head3 link
Arguments: Existing filename, hardlink name.
Returns an errno.
=head3 chmod
Arguments: Pathname, numeric modes.
Returns an errno.
=head3 chown
Arguments: Pathname, numeric uid, numeric gid.
Returns an errno.
=head3 truncate
Arguments: Pathname, numeric offset.
Returns an errno.
=head3 utime
Arguments: Pathname, numeric actime, numeric modtime.
Returns an errno.
=head3 open
Arguments: Pathname, numeric flags (which is an OR-ing of stuff like O_RDONLY and O_SYNC, constants you can import from POSIX).
Returns an errno.
=head3 read
Arguments: Pathname, numeric requestedsize, numeric offset.
Returns a numeric errno, or a string scalar with up to $requestedsize bytes of data.
=head3 write
Arguments: Pathname, scalar buffer, numeric offset. You can use length($buffer) to find the buffersize.
Returns an errno.
=head2 EXPORT
None by default.
=head2 Exportable constants
None.
=head1 AUTHOR
Mark Glines, E<lt>mark@glines.orgE<gt>
=head1 SEE ALSO
L<perl>, the FUSE documentation.
=cut
|
