Part 4 of a big cleanup action based on the upcoming dist-4.0

[metaconfig.git] / U / modified / d_mmap.U

?RCS: $Id$
?RCS:
?RCS: Copyright (c) 1999, Jarkko Hietaniemi
?RCS:
?RCS: You may redistribute only under the terms of the Artistic Licence,
?RCS: as specified in the README file that comes with the distribution.
?RCS: You may reuse parts of this distribution only within the terms of
?RCS: that same Artistic Licence; a copy of which may be found at the root
?RCS: of the source tree for dist 3.0.
?RCS:
?MAKE:d_mmap mmaptype: Inlibc i_sysmman cat cc ccflags
?MAKE:	-pick add $@ %<
?S:d_mmap:
?S:	This variable conditionally defines HAS_MMAP if mmap() is
?S:	available to map a file into memory.
?S:.
?S:mmaptype:
?S:	This symbol contains the type of pointer returned by mmap()
?S:	(and simultaneously the type of the first argument).
?S:	It can be 'void *' or 'caddr_t'.
?S:.
?C:HAS_MMAP:
?C:	This symbol, if defined, indicates that the mmap system call is
?C:	available to map a file into memory.
?C:.
?C:Mmap_t:
?C:	This symbol holds the return type of the mmap() system call
?C:	(and simultaneously the type of the first argument).
?C:	Usually set to 'void *' or 'caddr_t'.
?C:.
?H:#$d_mmap HAS_MMAP		/**/
?H:#define Mmap_t $mmaptype	/**/
?H:.
?LINT:set d_mmap
: see if mmap exists
set mmap d_mmap
eval $inlibc
: see what shmat returns
: default to something harmless
mmaptype='void *'
case "$i_sysmman$d_mmap" in
"$define$define")
	$cat >mmap.c <<'END'
#include <sys/mman.h>
void *mmap();
END
	if $cc $ccflags -c mmap.c >/dev/null 2>&1; then
		mmaptype='void *'
	else
		mmaptype='caddr_t'
	fi
	echo "and it returns ($mmaptype)." >&4
	;;
esac