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

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Revision 20 - (show annotations)
Tue Dec 27 14:49:31 2005 UTC (16 years, 6 months ago) by dpavlin
File MIME type: text/plain
File size: 3596 byte(s)
added missing example, 0.07_1

1 #!/usr/bin/perl -w
2 use strict;
3 use threads;
4 use threads::shared;
5
6 use Fuse;
7 use IO::File;
8 use POSIX qw(ENOENT ENOSYS EEXIST EPERM O_RDONLY O_RDWR O_APPEND O_CREAT);
9 use Fcntl qw(S_ISBLK S_ISCHR S_ISFIFO SEEK_SET);
10 require 'syscall.ph'; # for SYS_mknod and SYS_lchown
11
12 sub fixup { return "/tmp/fusetest-" . $ENV{LOGNAME} . shift }
13
14 sub x_getattr {
15 my ($file) = fixup(shift);
16 my (@list) = lstat($file);
17 return -$! unless @list;
18 return @list;
19 }
20
21 sub x_getdir {
22 my ($dirname) = fixup(shift);
23 unless(opendir(DIRHANDLE,$dirname)) {
24 return -ENOENT();
25 }
26 my (@files) = readdir(DIRHANDLE);
27 closedir(DIRHANDLE);
28 return (@files, 0);
29 }
30
31 sub x_open {
32 my ($file) = fixup(shift);
33 my ($mode) = shift;
34 return -$! unless sysopen(FILE,$file,$mode);
35 close(FILE);
36 return 0;
37 }
38
39 sub x_read {
40 my ($file,$bufsize,$off) = @_;
41 my ($rv) = -ENOSYS();
42 my ($handle) = new IO::File;
43 return -ENOENT() unless -e ($file = fixup($file));
44 my ($fsize) = -s $file;
45 return -ENOSYS() unless open($handle,$file);
46 if(seek($handle,$off,SEEK_SET)) {
47 read($handle,$rv,$bufsize);
48 }
49 return $rv;
50 }
51
52 sub x_write {
53 my ($file,$buf,$off) = @_;
54 my ($rv);
55 return -ENOENT() unless -e ($file = fixup($file));
56 my ($fsize) = -s $file;
57 return -ENOSYS() unless open(FILE,'+<',$file);
58 if($rv = seek(FILE,$off,SEEK_SET)) {
59 $rv = print(FILE $buf);
60 }
61 $rv = -ENOSYS() unless $rv;
62 close(FILE);
63 return length($buf);
64 }
65
66 sub err { return (-shift || -$!) }
67
68 sub x_readlink { return readlink(fixup(shift)); }
69 sub x_unlink { return unlink(fixup(shift)) ? 0 : -$!; }
70
71 sub x_symlink { print "symlink\n"; return symlink(shift,fixup(shift)) ? 0 : -$!; }
72
73 sub x_rename {
74 my ($old) = fixup(shift);
75 my ($new) = fixup(shift);
76 my ($err) = rename($old,$new) ? 0 : -ENOENT();
77 return $err;
78 }
79 sub x_link { return link(fixup(shift),fixup(shift)) ? 0 : -$! }
80 sub x_chown {
81 my ($fn) = fixup(shift);
82 print "nonexistent $fn\n" unless -e $fn;
83 my ($uid,$gid) = @_;
84 # perl's chown() does not chown symlinks, it chowns the symlink's
85 # target. it fails when the link's target doesn't exist, because
86 # the stat64() syscall fails.
87 # this causes error messages when unpacking symlinks in tarballs.
88 my ($err) = syscall(&SYS_lchown,$fn,$uid,$gid,$fn) ? -$! : 0;
89 return $err;
90 }
91 sub x_chmod {
92 my ($fn) = fixup(shift);
93 my ($mode) = shift;
94 my ($err) = chmod($mode,$fn) ? 0 : -$!;
95 return $err;
96 }
97 sub x_truncate { return truncate(fixup(shift),shift) ? 0 : -$! ; }
98 sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
99
100 sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
101 sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
102
103 sub x_mknod {
104 # since this is called for ALL files, not just devices, I'll do some checks
105 # and possibly run the real mknod command.
106 my ($file, $modes, $dev) = @_;
107 $file = fixup($file);
108 $! = 0;
109 syscall(&SYS_mknod,$file,$modes,$dev);
110 return -$!;
111 }
112
113 # kludge
114 sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
115 my ($mountpoint) = "";
116 $mountpoint = shift(@ARGV) if @ARGV;
117 Fuse::main(
118 mountpoint=>$mountpoint,
119 getattr =>"main::x_getattr",
120 readlink=>"main::x_readlink",
121 getdir =>"main::x_getdir",
122 mknod =>"main::x_mknod",
123 mkdir =>"main::x_mkdir",
124 unlink =>"main::x_unlink",
125 rmdir =>"main::x_rmdir",
126 symlink =>"main::x_symlink",
127 rename =>"main::x_rename",
128 link =>"main::x_link",
129 chmod =>"main::x_chmod",
130 chown =>"main::x_chown",
131 truncate=>"main::x_truncate",
132 utime =>"main::x_utime",
133 open =>"main::x_open",
134 read =>"main::x_read",
135 write =>"main::x_write",
136 statfs =>"main::x_statfs",
137 threaded=>1,
138 );

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