add 4 io

hc

2023-08-21 ef9e1ccebba20d2e3859126411166909a383f483

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# 
# Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
# Licensed under the GPL
#
 
# To get a definition of F_SETSIG
USER_CFLAGS += -D_GNU_SOURCE -D_LARGEFILE64_SOURCE
KBUILD_CFLAGS += -D_LARGEFILE64_SOURCE
DEV_NULL_PATH = \"/dev/null\"