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

[Matt Helsley]

On Wed, Aug 12, 2009 at 02:28:57AM -0400, Oren Laadan wrote:
> 
> 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 ?

Yup.

Cheers,
	-Matt

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

Only if I can make the same excuse ;)


> 
> 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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> > Containers at lists.linux-foundation.org
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