/[fuse.before_github]/perl/trunk/examples/example.pl
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Annotation of /perl/trunk/examples/example.pl

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Revision 4 - (hide annotations)
Thu Nov 11 14:44:15 2004 UTC (18 years ago) by mszeredi
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File size: 2459 byte(s)
Initial revision

1 mszeredi 4 #!/usr/bin/perl
2    
3     use Fuse;
4     use POSIX qw(ENOENT EISDIR EINVAL);
5    
6     my (%files) = (
7     '.' => {
8     type => 0040,
9     mode => 0755,
10     ctime => time()-1000
11     },
12     a => {
13     cont => "File 'a'.\n",
14     type => 0100,
15     mode => 0755,
16     ctime => time()-2000
17     },
18     b => {
19     cont => "This is file 'b'.\n",
20     type => 0100,
21     mode => 0644,
22     ctime => time()-1000
23     },
24     );
25    
26     sub filename_fixup {
27     my ($file) = shift;
28     $file =~ s,^/,,;
29     $file = '.' unless length($file);
30     return $file;
31     }
32    
33     sub e_getattr {
34     my ($file) = filename_fixup(shift);
35     $file =~ s,^/,,;
36     $file = '.' unless length($file);
37     return -ENOENT() unless exists($files{$file});
38     my ($size) = exists($files{$file}{cont}) ? length($files{$file}{cont}) : 0;
39     my ($modes) = ($files{$file}{type}<<9) + $files{$file}{mode};
40     my ($dev, $ino, $rdev, $blocks, $gid, $uid, $nlink, $blksize) = (0,0,0,1,0,0,1,1024);
41     my ($atime, $ctime, $mtime);
42     $atime = $ctime = $mtime = $files{$file}{ctime};
43     # 2 possible types of return values:
44     #return -ENOENT(); # or any other error you care to
45     #print(join(",",($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks)),"\n");
46     return ($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks);
47     }
48    
49     sub e_getdir {
50     # return as many text filenames as you like, followed by the retval.
51     print((scalar keys %files)."\n");
52     return (keys %files),0;
53     }
54    
55     sub e_open {
56     # VFS sanity check; it keeps all the necessary state, not much to do here.
57     my ($file) = filename_fixup(shift);
58     print("open called\n");
59     return -ENOENT() unless exists($files{$file});
60     return -EISDIR() unless exists($files{$file}{cont});
61     print("open ok\n");
62     return 0;
63     }
64    
65     sub e_read {
66     # return an error numeric, or binary/text string. (note: 0 means EOF, "0" will
67     # give a byte (ascii "0") to the reading program)
68     my ($file) = filename_fixup(shift);
69     my ($buf,$off) = @_;
70     return -ENOENT() unless exists($files{$file});
71     return -EINVAL() if $off > length($files{$file}{cont});
72     return 0 if $off == length($files{$file}{cont});
73     return substr($files{$file}{cont},$off,$buf);
74     }
75    
76     sub e_statfs { return 255, 1, 1, 1, 1, 2 }
77    
78     # If you run the script directly, it will run fusermount, which will in turn
79     # re-run this script. Hence the funky semantics.
80     my ($mountpoint) = "";
81     $mountpoint = shift(@ARGV) if @ARGV;
82     Fuse::main(
83     mountpoint=>$mountpoint,
84     getattr=>\&e_getattr,
85     getdir=>\&e_getdir,
86     open=>\&e_open,
87     statfs=>\&e_statfs,
88     read=>\&e_read,
89     #debug=>1, threaded=>0
90     );

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