[Devel] Re: [PATCH] Add script to, given a kernel source tree, automatically write the cr.h

[Oren Laadan]

If I understand correctly you want to avoid needing the kernel
sources (or headers) in order to compile user-cr - so you would
suggest to auto-generate the a header file and add it as a source
file to user-cr ?

(If this doesn't make any sense -- I'll blame the hour ...)

Oren.


Matt Helsley wrote:
> Oren,
> 
> 	Could this script or something like it be useful for user-cr
> rather than always using KERNELSRC and KERNELBUILD?
> 
> Cheers,
> 	-Matt Helsley
> On Tue, Aug 04, 2009 at 04:43:08PM -0700, Matt Helsley wrote:
>> Signed-off-by: Matt Helsley <matthltc at us.ibm.com>
>> ---
> 
> <snip>
> 
>> diff --git a/rewrite-cr-header.sh b/rewrite-cr-header.sh
>> new file mode 100755
>> index 0000000..22f92c7
>> --- /dev/null
>> +++ b/rewrite-cr-header.sh
>> @@ -0,0 +1,64 @@
>> +#!/bin/bash
>> +#
>> +# Rewrite the contents of cr.h
>> +#
>> +
>> +KERNELSRC=../oren
>> +
>> +################################################################################
>> +
>> +[ -z "${KERNELSRC}" ] && exit -1
>> +mv cr.h cr.h.bak || exit -1
>> +
>> +(
>> +COND='#if'
>> +set -e
>> +echo '/* AUTOMATICALLY GENERATED by rewrite-cr-header.sh */'
>> +
>> +#
>> +# Include non-__KERNEL__ sections of include/linux/checkpoint.h using
>> +# cpp to expand only the directives of the kernel header.
>> +#
>> +# The first 6 lines of cpp output write some trashy #define/#undef lines
>> +# we don't want. Would it be better to throw everything away until we see
>> +# "#define _LINUX_CHECKPOINT_H_" ??
>> +#
>> +cpp -CC -P -U__KERNEL__ -undef -nostdinc -fdirectives-only ${KERNELSRC}/include/linux/checkpoint.h | tail -n '+6'
>> +
>> +find ${KERNELSRC}/arch -name 'unistd*.h' -print | sort | \
>> +while read UNISTDH ; do
>> +	REGEX='[[:space:]]*#[[:space:]]*define[[:space:]]+__NR_(checkpoint|restart)[[:space:]]+[[:digit:]]+'
>> +
>> +	[ -z "${UNISTDH}" ] && continue
>> +	KARCH=$(echo "${UNISTDH}" | sed -e 's|.*/arch/\([^/]\+\)/.*|\1|')
>> +	BITNESS=$(basename "${UNISTDH}" | sed -e 's/unistd_*\([12346]\+\)\.h/\1/')
>> +
>> +	# Map KARCH to something suitable for CPP e.g. __i386__
>> +	case "${KARCH}" in
>> +	x86)	if [ "${BITNESS}" == "32" ]; then
>> +			CPPARCH=i386
>> +		else
>> +			CPPARCH=x86_64
>> +		fi
>> +		;;
>> +	s390*)	CPPARCH=s390x ;;
>> +	*)	CPPARCH="${KARCH}" ;;
>> +	esac
>> +
>> +	grep -q -E "${REGEX}" ${UNISTDH} || {
>> +		echo '/* '"${CPPARCH}"' unsupported. */'
>> +		continue
>> +	}
>> +
>> +	echo -e "${COND} __${CPPARCH}__\\n"
>> +	grep -E "${REGEX}" ${UNISTDH} | \
>> +	sed -e 's/^[[:space:]]*#define[[:space:]]\+__NR_\([^[:space:]]\+\)[[:space:]]\+\([^[:space:]]\+\).*$/#ifndef __NR_\1\n#define __NR_\1 \2\n#endif\n/'
>> +	COND='#elif'
>> +done
>> +echo -e '#else\n#error "Architecture does not have definitons for __NR_(checkpoint|restart)"\n#endif'
>> +) > cr.h || {
>> +	mv -f cr.h.bak cr.h
>> +	exit -1
>> +}
>> +
>> +rm -f cr.h.bak
>> -- 
>> 1.5.6.3
>>
>>
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