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

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Revision 18 - (hide annotations)
Wed Dec 21 15:33:37 2005 UTC (16 years, 7 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 dpavlin 18 #!/usr/bin/perl -w
2 mszeredi 4
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 dpavlin 10 sub fixup { return "/tmp/fusetest-" . $ENV{LOGNAME} . shift }
11 mszeredi 4
12     sub x_getattr {
13     my ($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 || -$!) }
65    
66 dpavlin 18 sub x_readlink { return readlink(fixup(shift)); }
67     sub x_unlink { return unlink(fixup(shift)) ? 0 : -$!; }
68 mszeredi 4
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 dpavlin 18 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 mszeredi 4 );

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