/[fuse.before_github]/perl/trunk/examples/loopback.pl
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Contents of /perl/trunk/examples/loopback.pl

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Revision 18 - (show annotations)
Wed Dec 21 15:33:37 2005 UTC (15 years, 11 months ago) by dpavlin
File MIME type: text/plain
File size: 3562 byte(s)
Mark Glines changes to add ithreads support:
* Support threading
* Fix the DEBUGf stuff, it seems to segfault these days
* Update the docs
* scrub off some bitrot

1 #!/usr/bin/perl -w
2
3 use strict;
4 use Fuse;
5 use IO::File;
6 use POSIX qw(ENOENT ENOSYS EEXIST EPERM O_RDONLY O_RDWR O_APPEND O_CREAT);
7 use Fcntl qw(S_ISBLK S_ISCHR S_ISFIFO SEEK_SET);
8 require 'syscall.ph'; # for SYS_mknod and SYS_lchown
9
10 sub fixup { return "/tmp/fusetest-" . $ENV{LOGNAME} . shift }
11
12 sub x_getattr {
13 my ($file) = fixup(shift);
14 my (@list) = lstat($file);
15 return -$! unless @list;
16 return @list;
17 }
18
19 sub x_getdir {
20 my ($dirname) = fixup(shift);
21 unless(opendir(DIRHANDLE,$dirname)) {
22 return -ENOENT();
23 }
24 my (@files) = readdir(DIRHANDLE);
25 closedir(DIRHANDLE);
26 return (@files, 0);
27 }
28
29 sub x_open {
30 my ($file) = fixup(shift);
31 my ($mode) = shift;
32 return -$! unless sysopen(FILE,$file,$mode);
33 close(FILE);
34 return 0;
35 }
36
37 sub x_read {
38 my ($file,$bufsize,$off) = @_;
39 my ($rv) = -ENOSYS();
40 my ($handle) = new IO::File;
41 return -ENOENT() unless -e ($file = fixup($file));
42 my ($fsize) = -s $file;
43 return -ENOSYS() unless open($handle,$file);
44 if(seek($handle,$off,SEEK_SET)) {
45 read($handle,$rv,$bufsize);
46 }
47 return $rv;
48 }
49
50 sub x_write {
51 my ($file,$buf,$off) = @_;
52 my ($rv);
53 return -ENOENT() unless -e ($file = fixup($file));
54 my ($fsize) = -s $file;
55 return -ENOSYS() unless open(FILE,'+<',$file);
56 if($rv = seek(FILE,$off,SEEK_SET)) {
57 $rv = print(FILE $buf);
58 }
59 $rv = -ENOSYS() unless $rv;
60 close(FILE);
61 return length($buf);
62 }
63
64 sub err { return (-shift || -$!) }
65
66 sub x_readlink { return readlink(fixup(shift)); }
67 sub x_unlink { return unlink(fixup(shift)) ? 0 : -$!; }
68
69 sub x_symlink { print "symlink\n"; return symlink(shift,fixup(shift)) ? 0 : -$!; }
70
71 sub x_rename {
72 my ($old) = fixup(shift);
73 my ($new) = fixup(shift);
74 my ($err) = rename($old,$new) ? 0 : -ENOENT();
75 return $err;
76 }
77 sub x_link { return link(fixup(shift),fixup(shift)) ? 0 : -$! }
78 sub x_chown {
79 my ($fn) = fixup(shift);
80 print "nonexistent $fn\n" unless -e $fn;
81 my ($uid,$gid) = @_;
82 # perl's chown() does not chown symlinks, it chowns the symlink's
83 # target. it fails when the link's target doesn't exist, because
84 # the stat64() syscall fails.
85 # this causes error messages when unpacking symlinks in tarballs.
86 my ($err) = syscall(&SYS_lchown,$fn,$uid,$gid,$fn) ? -$! : 0;
87 return $err;
88 }
89 sub x_chmod {
90 my ($fn) = fixup(shift);
91 my ($mode) = shift;
92 my ($err) = chmod($mode,$fn) ? 0 : -$!;
93 return $err;
94 }
95 sub x_truncate { return truncate(fixup(shift),shift) ? 0 : -$! ; }
96 sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
97
98 sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
99 sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
100
101 sub x_mknod {
102 # since this is called for ALL files, not just devices, I'll do some checks
103 # and possibly run the real mknod command.
104 my ($file, $modes, $dev) = @_;
105 $file = fixup($file);
106 $! = 0;
107 syscall(&SYS_mknod,$file,$modes,$dev);
108 return -$!;
109 }
110
111 # kludge
112 sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
113 my ($mountpoint) = "";
114 $mountpoint = shift(@ARGV) if @ARGV;
115 Fuse::main(
116 mountpoint=>$mountpoint,
117 getattr =>"main::x_getattr",
118 readlink=>"main::x_readlink",
119 getdir =>"main::x_getdir",
120 mknod =>"main::x_mknod",
121 mkdir =>"main::x_mkdir",
122 unlink =>"main::x_unlink",
123 rmdir =>"main::x_rmdir",
124 symlink =>"main::x_symlink",
125 rename =>"main::x_rename",
126 link =>"main::x_link",
127 chmod =>"main::x_chmod",
128 chown =>"main::x_chown",
129 truncate=>"main::x_truncate",
130 utime =>"main::x_utime",
131 open =>"main::x_open",
132 read =>"main::x_read",
133 write =>"main::x_write",
134 statfs =>"main::x_statfs",
135 threaded=>0,
136 );

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