patch from Chris Dolan via rt.cpan.org #30631

[perl-fuse.git] / examples / loopback_t.pl

diff --git a/examples/loopback_t.pl b/examples/loopback_t.pl
index a37daba..8302aa8 100644 (file)
--- a/examples/loopback_t.pl
+++ b/examples/loopback_t.pl
@@ -8,7 +8,20 @@ use Fuse;
 use IO::File;
 use POSIX qw(ENOENT ENOSYS EEXIST EPERM O_RDONLY O_RDWR O_APPEND O_CREAT);
 use Fcntl qw(S_ISBLK S_ISCHR S_ISFIFO SEEK_SET);
-require 'syscall.ph'; # for SYS_mknod and SYS_lchown
+my $can_syscall = eval {
+       require 'syscall.ph'; # for SYS_mknod and SYS_lchown
+};
+if (!$can_syscall && open my $fh, '<', '/usr/include/sys/syscall.h') {
+       my %sys = do { local $/ = undef;
+                       <$fh> =~ m/\#define \s+ (\w+) \s+ (\d+)/gxms;
+        };
+       close $fh;
+       if ($sys{SYS_mknod} && $sys{SYS_lchown}) {
+               *SYS_mknod  = sub { $sys{SYS_mknod}  };
+               *SYS_lchown = sub { $sys{SYS_lchown} };
+               $can_syscall = 1;
+       }
+}
 
 sub fixup { return "/tmp/fusetest-" . $ENV{LOGNAME} . shift }
 
@@ -79,6 +92,7 @@ sub x_rename {
 }
 sub x_link { return link(fixup(shift),fixup(shift)) ? 0 : -$! }
 sub x_chown {
+       return -ENOSYS() if ! $can_syscall;
        my ($fn) = fixup(shift);
        print "nonexistent $fn\n" unless -e $fn;
        my ($uid,$gid) = @_;
@@ -102,6 +116,7 @@ sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); ret
 sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
 
 sub x_mknod {
+       return -ENOSYS() if ! $can_syscall;
        # since this is called for ALL files, not just devices, I'll do some checks
        # and possibly run the real mknod command.
        my ($file, $modes, $dev) = @_;