?RCS: $Id: d_NOFILE.U 1 2006-08-24 12:32:52Z rmanfredi $
?RCS:
?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi
?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 4.0.
?RCS:
?RCS: $Log: d_NOFILE.U,v $
?RCS: Revision 3.0.1.1  1994/10/29  16:08:38  ram
?RCS: patch36: added ?F: line for metalint file checking
?RCS:
?RCS: Revision 3.0  1993/08/18  12:05:39  ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?MAKE:nofile d_gettblsz tablesize: Myread Guess cat +cc +ccflags +libs \
	test rm Csym
?MAKE:	-pick add $@ %<
?S:nofile:
?S:	This variable contains the number of file descriptors available to the
?S:	process.
?S:.
?S:d_gettblsz:
?S:	This variable conditionally handles remapping of the getdtablesize()
?S:	subroutine to ulimit(4,0), or the NOFILE manifest constant.
?S:.
?S:tablesize:
?S:	This variable contains either the 'NOFILE' constant or 'ulimit(4, 0L)'
?S:	and is used as the remapped value for the getdtablesize() macro.
?S:.
?C:getdtablesize:
?C:	This catches use of the getdtablesize() subroutine, and remaps it
?C:	to either ulimit(4,0) or NOFILE, if getdtablesize() isn't available.
?C:.
?C:VAL_NOFILE:
?C:	This symbol contains the number of file descriptors available to the
?C:	process, as determined at configuration time. Unless a static constant
?C:	is needed, you should rely on getdtablesize() to obtain that number.
?C:.
?H:#$d_gettblsz getdtablesize() $tablesize	/**/
?H:#define VAL_NOFILE $nofile	/* Number of file descriptors */
?H:.
?F:!nofile
?T:d_ulimit4 val
: see if getdtablesize exists
echo " "
?X: Revert logical value (d_gettblsz is undef iff getdtablesize is present)
case "$d_gettblsz" in
$define) d_gettblsz="$undef";;
$undef) d_gettblsz="$define";;
esac
if set getdtablesize val -f d_gettblsz; eval $csym; $val; then
	echo 'getdtablesize() found.' >&4
	d_gettblsz="$undef"
	tablesize=''
@if VAL_NOFILE || nofile
	$cat >nofile.c <<'EOCP'
#include <stdio.h>
int main()
{
	printf("%d\n", getdtablesize());
}
EOCP
	nofile=''
	if $cc $ccflags -o nofile nofile.c $libs >/dev/null 2>&1; then
		nofile=`./nofile 2>/dev/null`
	fi
	if $test "$nofile"; then
		echo "(You have $nofile file descriptors available per process.)"
	else
		nofile='20'
		if ./bsd; then
			nofile='64'
		fi
	echo "(Hmm... Let's say you have $nofile file descriptors available.)"
	fi
@end
else
	echo 'getdtablesize() NOT found...' >&4
	if set ulimit val -f; eval $csym; $val; then
		echo 'Maybe ulimit(4,0) will work...'
		$cat >nofile.c <<'EOCP'
#include <stdio.h>
#ifdef GETPARAM_H
#include <sys/param.h>
#endif
int main()
{
	printf("%d %d\n",
#ifdef NOFILE
		NOFILE,
#else
		0,
#endif
		ulimit(4,0));
		exit(0);
}
EOCP
		if $cc $ccflags -DGETPARAM_H -o nofile nofile.c $libs >/dev/null 2>&1 \
			|| $cc $ccflags -o nofile nofile.c $libs >/dev/null 2>&1 ; then
			set `./nofile`
			d_gettblsz=$1
			d_ulimit4=$2
			if $test "$d_ulimit4" -lt 0; then
				echo "Your ulimit() call doesn't tell me what I want to know."
				echo "We'll just use NOFILE in this case."
				nofile=$d_gettblsz
				d_gettblsz="$define"
				tablesize='NOFILE'
			else
				if $test "$d_gettblsz" -gt 0; then
				echo "Your system defines NOFILE to be $d_gettblsz, and" >&4
				else
				echo "I had trouble getting NOFILE from your system, but" >&4
				fi
echo "ulimit returns $d_ulimit4 as the number of available file descriptors." >&4
				dflt='y';
				echo " "
	rp='Should I use ulimit to get the number of available file descriptors?'
				. ./myread
				case "$ans" in
				y*)
					nofile=$d_ulimit4
					d_gettblsz="$define"
					tablesize='ulimit(4, 0L)'
					echo "Using ulimit(4,0)."
					;;
				*)
					nofile=$d_gettblsz
					d_gettblsz="$define"
					tablesize='NOFILE'
					echo "Using NOFILE."
					;;
				esac
			fi
		else
			echo "Strange, I couldn't get my test program to compile."
			echo "We'll just use NOFILE in this case."
			d_gettblsz="$define"
			tablesize='NOFILE'
			nofile=''
		fi
	else
		echo 'Using NOFILE instead.'
		d_gettblsz="$define"
		tablesize='NOFILE'
		nofile=''
	fi
fi
@if VAL_NOFILE || nofile
case "$nofile" in
'')
	$cat >nofile.c <<'EOCP'
#include <stdio.h>
#ifdef GETPARAM_H
#include <sys/param.h>
#endif
int main()
{
	printf("%d\n",
#ifdef NOFILE
		NOFILE,
#else
		0,
#endif
		);
		exit(0);
}
EOCP
	if $cc $ccflags -DGETPARAM_H -o nofile nofile.c $libs >/dev/null 2>&1 \
		|| $cc $ccflags -o nofile nofile.c $libs >/dev/null 2>&1 ; then
		nofile=`./nofile 2>/dev/null`
	fi
	if $test "$nofile"; then
		echo "(You have $nofile file descriptors available per process.)"
	else
		nofile='20'
		if ./bsd; then
			nofile='64'
		fi
	echo "(Hmm... Let's say you have $nofile file descriptors available.)"
	fi
	;;
esac
@end
$rm -f nofile*