Circumvent buggy negation of assigned $!.

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

diff --git a/examples/loopback_t.pl b/examples/loopback_t.pl
old mode 100644 (file)
new mode 100755 (executable)
index 9ae10fe..db03fb9
--- a/examples/loopback_t.pl
+++ b/examples/loopback_t.pl
@@ -3,11 +3,25 @@ use strict;
 use threads;
 use threads::shared;
 
+use blib;
 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
+use Fcntl qw(S_ISBLK S_ISCHR S_ISFIFO SEEK_SET S_ISREG S_ISFIFO S_IMODE);
+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 }
 
@@ -78,6 +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,$gid) = @_;
@@ -101,11 +116,23 @@ sub x_mkdir { my ($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) = @_;
        $file = fixup($file);
-       $! = 0;
+       undef $!;
+       if ($^O eq 'freebsd') {
+               if (S_ISREG($modes)) {
+                       open(FILE, '>', $file) || return -$!;
+                       print FILE "";
+                       close(FILE);
+                       return 0;
+               } elsif (S_ISFIFO($modes)) {
+                       my ($rv) = POSIX::mkfifo($file, S_IMODE($modes));
+                       return $rv ? 0 : -POSIX::errno();
+               }
+       }
        syscall(&SYS_mknod,$file,$modes,$dev);
        return -$!;
 }