#!/usr/bin/env perl
+# fioc.pl: A Perl conversion of the fioc example IOCTL server program
+# from the FUSE distribution. I've endeavored to stay pretty close
+# structure-wise to the C version, while using Perl-specific features.
+# I wrote this to provide a way to verify my ioctl() wrapper
+# implementation would work properly. So far, it seems to, and it will
+# interoperate with the C client as well.
+
use strict;
no strict qw(refs);
use Carp;
local $SIG{'__WARN__'} = \&Carp::cluck;
-use Fuse;
+use Fuse qw(:all);
use Fcntl qw(:mode);
use POSIX;
require 'asm/ioctl.ph';
-our %sizeof = ('int' => 4);
-sub FIOC_GET_SIZE { _IOR(ord 'E', 0, 'int'); }
-sub FIOC_SET_SIZE { _IOW(ord 'E', 1, 'int'); }
+our %sizeof = ('size_t' => length(pack('L!')));
+sub FIOC_GET_SIZE { _IOR(ord 'E', 0, 'size_t'); }
+sub FIOC_SET_SIZE { _IOW(ord 'E', 1, 'size_t'); }
+sub TCGETS { 0x5401; }
sub fioc_resize {
my ($size) = @_;
my ($path, $flags, $info) = @_;
print 'called ', (caller(0))[3], "\n";
- if (fioc_file_type($path) != FIOC_NONE) {
- return 0;
- }
+ return 0 if fioc_file_type($path) != FIOC_NONE;
return -&ENOENT;
}
print 'called ', (caller(0))[3], "\n";
return -&EINVAL if fioc_file_type($path) != FIOC_FILE;
-
- if ($offset > $fioc_size) {
- return q{};
- }
+ return q{} if $offset > $fioc_size;
if ($size > $fioc_size - $offset) {
$size - $fioc_size - $offset;
lock($fioc_buf);
return -&EINVAL if fioc_file_type($path) != FIOC_FILE;
-
- if (fioc_expand($offset + length($data))) {
- return -&ENOMEM;
- }
+ return -&ENOMEM if fioc_expand($offset + length($data));
substr($fioc_buf, $offset, length($data), $data);
return length($data);
sub fioc_ioctl {
my ($path, $cmd, $flags, $data) = @_;
print 'called ', (caller(0))[3], "\n";
- $cmd = unpack('L', pack('l', $cmd));
return -&EINVAL if fioc_file_type($path) != FIOC_FILE;
-
- return -&ENOSYS if $flags & 0x1;
+ return -&ENOSYS if $flags & FUSE_IOCTL_COMPAT;
if ($cmd == FIOC_GET_SIZE) {
- return(0, pack('L', $fioc_size));
+ return(0, pack('L!', $fioc_size));
}
elsif ($cmd == FIOC_SET_SIZE) {
lock($fioc_buf);
- fioc_resize(unpack('L', $data));
+ fioc_resize(unpack('L!', $data));
return 0;
}
+ elsif ($cmd == TCGETS) {
+ # perl sends TCGETS as part of calling isatty() on opening a file;
+ # this appears to be a more canonical answer
+ return -&ENOTTY;
+ }
return -&EINVAL;
}