UnixFileSystemProvider.java 文件源码

@Override
public Path readSymbolicLink(Path obj1) throws IOException {
    UnixPath link = UnixPath.toUnixPath(obj1);
    // permission check
    SecurityManager sm = System.getSecurityManager();
    if (sm != null) {
        FilePermission perm = new FilePermission(link.getPathForPermissionCheck(),
            SecurityConstants.FILE_READLINK_ACTION);
        sm.checkPermission(perm);
    }
    try {
        byte[] target = readlink(link);
        return new UnixPath(link.getFileSystem(), target);
    } catch (UnixException x) {
       if (x.errno() == UnixConstants.EINVAL)
            throw new NotLinkException(link.getPathForExceptionMessage());
        x.rethrowAsIOException(link);
        return null;    // keep compiler happy
    }
}