/[fuse.before_github]/perl-llin/examples/example.pl
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Contents of /perl-llin/examples/example.pl

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Revision 108 - (show annotations)
Sat Jan 20 12:21:12 2007 UTC (14 years, 9 months ago) by dpavlin
File MIME type: text/plain
File size: 2861 byte(s)
Changes from Marc to implement fuse_get_context(): 
* an XS function to get the data
* a mention of it in Fuse.pm so it can be exported properly
* a pretty ugly hack to example.pl, which is how I tested it.
1 #!/usr/bin/perl -w
2 use strict;
3
4 use blib;
5 use Fuse qw(fuse_get_context);
6 use POSIX qw(ENOENT EISDIR EINVAL);
7
8 my (%files) = (
9 '.' => {
10 type => 0040,
11 mode => 0755,
12 ctime => time()-1000
13 },
14 a => {
15 cont => "File 'a'.\n",
16 type => 0100,
17 mode => 0755,
18 ctime => time()-2000
19 },
20 b => {
21 cont => "This is file 'b'.\n",
22 type => 0100,
23 mode => 0644,
24 ctime => time()-1000
25 },
26 me => {
27 size => 45,
28 type => 0100,
29 mode => 0644,
30 ctime => time()-1000
31 },
32 );
33
34 sub filename_fixup {
35 my ($file) = shift;
36 $file =~ s,^/,,;
37 $file = '.' unless length($file);
38 return $file;
39 }
40
41 sub e_getattr {
42 my ($file) = filename_fixup(shift);
43 $file =~ s,^/,,;
44 $file = '.' unless length($file);
45 return -ENOENT() unless exists($files{$file});
46 my ($size) = exists($files{$file}{cont}) ? length($files{$file}{cont}) : 0;
47 $size = $files{$file}{size} if exists $files{$file}{size};
48 my ($modes) = ($files{$file}{type}<<9) + $files{$file}{mode};
49 my ($dev, $ino, $rdev, $blocks, $gid, $uid, $nlink, $blksize) = (0,0,0,1,0,0,1,1024);
50 my ($atime, $ctime, $mtime);
51 $atime = $ctime = $mtime = $files{$file}{ctime};
52 # 2 possible types of return values:
53 #return -ENOENT(); # or any other error you care to
54 #print(join(",",($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks)),"\n");
55 return ($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks);
56 }
57
58 sub e_getdir {
59 # return as many text filenames as you like, followed by the retval.
60 print((scalar keys %files)."\n");
61 return (keys %files),0;
62 }
63
64 sub e_open {
65 # VFS sanity check; it keeps all the necessary state, not much to do here.
66 my ($file) = filename_fixup(shift);
67 print("open called\n");
68 return -ENOENT() unless exists($files{$file});
69 return -EISDIR() if $files{$file}{type} & 0040;
70 print("open ok\n");
71 return 0;
72 }
73
74 sub e_read {
75 # return an error numeric, or binary/text string. (note: 0 means EOF, "0" will
76 # give a byte (ascii "0") to the reading program)
77 my ($file) = filename_fixup(shift);
78 my ($buf,$off) = @_;
79 return -ENOENT() unless exists($files{$file});
80 if(!exists($files{$file}{cont})) {
81 return -EINVAL() if $off > 0;
82 my $context = fuse_get_context();
83 return sprintf("pid=0x%08x uid=0x%08x gid=0x%08x\n",@$context{'pid','uid','gid'});
84 }
85 return -EINVAL() if $off > length($files{$file}{cont});
86 return 0 if $off == length($files{$file}{cont});
87 return substr($files{$file}{cont},$off,$buf);
88 }
89
90 sub e_statfs { return 255, 1, 1, 1, 1, 2 }
91
92 # If you run the script directly, it will run fusermount, which will in turn
93 # re-run this script. Hence the funky semantics.
94 my ($mountpoint) = "";
95 $mountpoint = shift(@ARGV) if @ARGV;
96 Fuse::main(
97 mountpoint=>$mountpoint,
98 getattr=>"main::e_getattr",
99 getdir =>"main::e_getdir",
100 open =>"main::e_open",
101 statfs =>"main::e_statfs",
102 read =>"main::e_read",
103 threaded=>0
104 );

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