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

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Revision 19 - (show annotations)
Tue Dec 27 12:47:00 2005 UTC (16 years, 6 months ago) by dpavlin
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File size: 2501 byte(s)
Changes from Mark Glines in preparation for 0.07
- Remove the FUSE_DEBUG constant; we never actually implemented
  it to begin with.
- "make test" now uses the version of Fuse you've just built,
  not the one installed in /usr/lib/perl5.
- getattr test now allows blksize to vary between host and fuse
  fs, as this is not a bug.
- Add experimental support for threading.  The following minor
  API changes accommodate this:
- The nonexistent (yet documented) "unthreaded=>1" attribute
  has been replaced with the "threaded=>1" attribute, and this
  time it actually exists.
- Symbolic refs like "main::e_getattr" are now allowed for
  callbacks, because threaded mode needs to share() the
  callbacks, yet perl 5.8.7 does not allow share()ing code
  refs yet.  Direct code-refs are still supported as much
  as possible (currently, non-threaded mode).
- testsuite uses a multithreaded loopback.pl, when available.
- Update docs accordingly.  Update examples accordingly.

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

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