hush/libbb/mk_loop_h.sh

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#!/bin/sh
#
# Figure out (i) the type of dev_t (ii) the defines for loop stuff
#
rm -f loop.h
# Since 1.3.79 there is an include file <asm/posix_types.h>
# that defines __kernel_dev_t.
# (The file itself appeared in 1.3.78, but there it defined __dev_t.)
# If it exists, we use it, or, rather, <linux/posix_types.h> which
# avoids namespace pollution. Otherwise we guess that __kernel_dev_t
# is an unsigned short (which is true on i386, but false on alpha).
if [ -f /usr/include/linux/posix_types.h ]; then
echo '#include <linux/posix_types.h>' >> loop.h
echo '#undef dev_t' >> loop.h
echo '#define dev_t __kernel_dev_t' >> loop.h
else
echo '#undef dev_t' >> loop.h
echo '#define dev_t unsigned short' >> loop.h
fi
# Next we have to find the loop stuff itself.
# First try kernel source, then a private version.
if [ -f /usr/include/linux/loop.h ]; then
echo '#include <linux/loop.h>' >> loop.h
else
echo '#include "real_loop.h"' >> loop.h
fi
echo '#undef dev_t' >> loop.h