diff --git a/resources/functionMap.php b/resources/functionMap.php
index ed1a7bb993..2029567c0a 100644
--- a/resources/functionMap.php
+++ b/resources/functionMap.php
@@ -2232,65 +2232,65 @@
 'each' => ['array', '&rw_arr'=>'array'],
 'easter_date' => ['int', 'year='=>'int'],
 'easter_days' => ['int', 'year='=>'int', 'method='=>'int'],
-'eio_busy' => ['resource', 'delay'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_busy' => ['resource|false', 'delay'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
 'eio_cancel' => ['void', 'req'=>'resource'],
-'eio_chmod' => ['resource', 'path'=>'string', 'mode'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_chown' => ['resource', 'path'=>'string', 'uid'=>'int', 'gid='=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_close' => ['resource', 'fd'=>'mixed', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_custom' => ['resource', 'execute'=>'callable', 'pri'=>'int', 'callback'=>'callable', 'data='=>'mixed'],
-'eio_dup2' => ['resource', 'fd'=>'mixed', 'fd2'=>'mixed', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_chmod' => ['resource|false', 'path'=>'string', 'mode'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_chown' => ['resource|false', 'path'=>'string', 'uid'=>'int', 'gid='=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_close' => ['resource|false', 'fd'=>'mixed', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_custom' => ['resource|false', 'execute'=>'callable', 'pri'=>'int', 'callback'=>'callable', 'data='=>'mixed'],
+'eio_dup2' => ['resource|false', 'fd'=>'mixed', 'fd2'=>'mixed', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
 'eio_event_loop' => ['bool'],
-'eio_fallocate' => ['resource', 'fd'=>'mixed', 'mode'=>'int', 'offset'=>'int', 'length'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_fchmod' => ['resource', 'fd'=>'mixed', 'mode'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_fchown' => ['resource', 'fd'=>'mixed', 'uid'=>'int', 'gid='=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_fdatasync' => ['resource', 'fd'=>'mixed', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_fstat' => ['resource', 'fd'=>'mixed', 'pri'=>'int', 'callback'=>'callable', 'data='=>'mixed'],
-'eio_fstatvfs' => ['resource', 'fd'=>'mixed', 'pri'=>'int', 'callback'=>'callable', 'data='=>'mixed'],
-'eio_fsync' => ['resource', 'fd'=>'mixed', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_ftruncate' => ['resource', 'fd'=>'mixed', 'offset='=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_futime' => ['resource', 'fd'=>'mixed', 'atime'=>'float', 'mtime'=>'float', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_fallocate' => ['resource|false', 'fd'=>'mixed', 'mode'=>'int', 'offset'=>'int', 'length'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_fchmod' => ['resource|false', 'fd'=>'mixed', 'mode'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_fchown' => ['resource|false', 'fd'=>'mixed', 'uid'=>'int', 'gid='=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_fdatasync' => ['resource|false', 'fd'=>'mixed', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_fstat' => ['resource|false', 'fd'=>'mixed', 'pri'=>'int', 'callback'=>'callable', 'data='=>'mixed'],
+'eio_fstatvfs' => ['resource|false', 'fd'=>'mixed', 'pri'=>'int', 'callback'=>'callable', 'data='=>'mixed'],
+'eio_fsync' => ['resource|false', 'fd'=>'mixed', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_ftruncate' => ['resource|false', 'fd'=>'mixed', 'offset='=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_futime' => ['resource|false', 'fd'=>'mixed', 'atime'=>'float', 'mtime'=>'float', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
 'eio_get_event_stream' => ['mixed'],
 'eio_get_last_error' => ['string', 'req'=>'resource'],
-'eio_grp' => ['resource', 'callback'=>'callable', 'data='=>'string'],
+'eio_grp' => ['resource|false', 'callback'=>'callable', 'data='=>'string'],
 'eio_grp_add' => ['void', 'grp'=>'resource', 'req'=>'resource'],
 'eio_grp_cancel' => ['void', 'grp'=>'resource'],
 'eio_grp_limit' => ['void', 'grp'=>'resource', 'limit'=>'int'],
 'eio_init' => ['void'],
-'eio_link' => ['resource', 'path'=>'string', 'new_path'=>'string', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_lstat' => ['resource', 'path'=>'string', 'pri'=>'int', 'callback'=>'callable', 'data='=>'mixed'],
-'eio_mkdir' => ['resource', 'path'=>'string', 'mode'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_mknod' => ['resource', 'path'=>'string', 'mode'=>'int', 'dev'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_nop' => ['resource', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_link' => ['resource|false', 'path'=>'string', 'new_path'=>'string', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_lstat' => ['resource|false', 'path'=>'string', 'pri'=>'int', 'callback'=>'callable', 'data='=>'mixed'],
+'eio_mkdir' => ['resource|false', 'path'=>'string', 'mode'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_mknod' => ['resource|false', 'path'=>'string', 'mode'=>'int', 'dev'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_nop' => ['resource|false', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
 'eio_npending' => ['int'],
 'eio_nready' => ['int'],
 'eio_nreqs' => ['int'],
 'eio_nthreads' => ['int'],
-'eio_open' => ['resource', 'path'=>'string', 'flags'=>'int', 'mode'=>'int', 'pri'=>'int', 'callback'=>'callable', 'data='=>'mixed'],
+'eio_open' => ['resource|false', 'path'=>'string', 'flags'=>'int', 'mode'=>'int', 'pri'=>'int', 'callback'=>'callable', 'data='=>'mixed'],
 'eio_poll' => ['int'],
-'eio_read' => ['resource', 'fd'=>'mixed', 'length'=>'int', 'offset'=>'int', 'pri'=>'int', 'callback'=>'callable', 'data='=>'mixed'],
-'eio_readahead' => ['resource', 'fd'=>'mixed', 'offset'=>'int', 'length'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_readdir' => ['resource', 'path'=>'string', 'flags'=>'int', 'pri'=>'int', 'callback'=>'callable', 'data='=>'string'],
-'eio_readlink' => ['resource', 'path'=>'string', 'pri'=>'int', 'callback'=>'callable', 'data='=>'string'],
-'eio_realpath' => ['resource', 'path'=>'string', 'pri'=>'int', 'callback'=>'callable', 'data='=>'string'],
-'eio_rename' => ['resource', 'path'=>'string', 'new_path'=>'string', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_rmdir' => ['resource', 'path'=>'string', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_seek' => ['resource', 'fd'=>'mixed', 'offset'=>'int', 'whence'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_sendfile' => ['resource', 'out_fd'=>'mixed', 'in_fd'=>'mixed', 'offset'=>'int', 'length'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'string'],
+'eio_read' => ['resource|false', 'fd'=>'mixed', 'length'=>'int', 'offset'=>'int', 'pri'=>'int', 'callback'=>'callable', 'data='=>'mixed'],
+'eio_readahead' => ['resource|false', 'fd'=>'mixed', 'offset'=>'int', 'length'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_readdir' => ['resource|false', 'path'=>'string', 'flags'=>'int', 'pri'=>'int', 'callback'=>'callable', 'data='=>'string'],
+'eio_readlink' => ['resource|false', 'path'=>'string', 'pri'=>'int', 'callback'=>'callable', 'data='=>'string'],
+'eio_realpath' => ['resource|false', 'path'=>'string', 'pri'=>'int', 'callback'=>'callable', 'data='=>'string'],
+'eio_rename' => ['resource|false', 'path'=>'string', 'new_path'=>'string', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_rmdir' => ['resource|false', 'path'=>'string', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_seek' => ['resource|false', 'fd'=>'mixed', 'offset'=>'int', 'whence'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_sendfile' => ['resource|false', 'out_fd'=>'mixed', 'in_fd'=>'mixed', 'offset'=>'int', 'length'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'string'],
 'eio_set_max_idle' => ['void', 'nthreads'=>'int'],
 'eio_set_max_parallel' => ['void', 'nthreads'=>'int'],
 'eio_set_max_poll_reqs' => ['void', 'nreqs'=>'int'],
 'eio_set_max_poll_time' => ['void', 'nseconds'=>'float'],
 'eio_set_min_parallel' => ['void', 'nthreads'=>'string'],
-'eio_stat' => ['resource', 'path'=>'string', 'pri'=>'int', 'callback'=>'callable', 'data='=>'mixed'],
-'eio_statvfs' => ['resource', 'path'=>'string', 'pri'=>'int', 'callback'=>'callable', 'data='=>'mixed'],
-'eio_symlink' => ['resource', 'path'=>'string', 'new_path'=>'string', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_sync' => ['resource', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_sync_file_range' => ['resource', 'fd'=>'mixed', 'offset'=>'int', 'nbytes'=>'int', 'flags'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_syncfs' => ['resource', 'fd'=>'mixed', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_truncate' => ['resource', 'path'=>'string', 'offset='=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_unlink' => ['resource', 'path'=>'string', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_utime' => ['resource', 'path'=>'string', 'atime'=>'float', 'mtime'=>'float', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
-'eio_write' => ['resource', 'fd'=>'mixed', 'str'=>'string', 'length='=>'int', 'offset='=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_stat' => ['resource|false', 'path'=>'string', 'pri'=>'int', 'callback'=>'callable', 'data='=>'mixed'],
+'eio_statvfs' => ['resource|false', 'path'=>'string', 'pri'=>'int', 'callback'=>'callable', 'data='=>'mixed'],
+'eio_symlink' => ['resource|false', 'path'=>'string', 'new_path'=>'string', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_sync' => ['resource|false', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_sync_file_range' => ['resource|false', 'fd'=>'mixed', 'offset'=>'int', 'nbytes'=>'int', 'flags'=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_syncfs' => ['resource|false', 'fd'=>'mixed', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_truncate' => ['resource|false', 'path'=>'string', 'offset='=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_unlink' => ['resource|false', 'path'=>'string', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_utime' => ['resource|false', 'path'=>'string', 'atime'=>'float', 'mtime'=>'float', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
+'eio_write' => ['resource|false', 'fd'=>'mixed', 'str'=>'string', 'length='=>'int', 'offset='=>'int', 'pri='=>'int', 'callback='=>'callable', 'data='=>'mixed'],
 'EmptyIterator::current' => ['mixed'],
 'EmptyIterator::key' => ['mixed'],
 'EmptyIterator::next' => ['void'],