?RCS: $Id$
?RCS:
?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi
?RCS:
?RCS: You may redistribute only under the terms of the Artistic License,
?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 License; a copy of which may be found at the root
?RCS: of the source tree for dist 4.0.
?RCS:
?RCS: $Log: d_access.U,v $
?RCS: Revision 3.0  1993/08/18  12:05:42  ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?MAKE:d_access: test +cc cat +cppflags h_fcntl h_sysfile rm Trylink Findhdr \
	i_unistd
?MAKE:	-pick add $@ %<
?S:d_access:
?S:	This variable conditionally defines HAS_ACCESS if the access() system
?S:	call is available to check for access permissions using real IDs.
?S:.
?C:HAS_ACCESS:
?C:	This manifest constant lets the C program know that the access()
?C:	system call is available to check for accessibility using real UID/GID.
?C:	(always present on UNIX.)
?C:.
?H:#$d_access HAS_ACCESS		/**/
?H:.
?W:%<:R_OK W_OK X_OK F_OK
?LINT:set d_access
?LINT:change h_fcntl h_sysfile
: access call always available on UNIX
$cat >try.c <<EOC
#$i_unistd I_UNISTD
#ifdef I_UNISTD
#include <unistd.h>
#endif
int main(void)
{
	static int ret;
	ret |= access("path", 1);
	return ret ? 0 : 1;
}
EOC
cyn=access
set d_access
eval $trylink

: locate the flags for 'access()'
case "$d_access" in
"$define")
	echo " "
	$cat >access.c <<'EOCP'
#include <sys/types.h>
#ifdef I_FCNTL
#include <fcntl.h>
#endif
#ifdef I_SYS_FILE
#include <sys/file.h>
#endif
#ifdef I_UNISTD
#include <unistd.h>
#endif
int main(void) {
	static int mode;
	mode |= R_OK;
	mode |= W_OK;
	mode |= X_OK;
	mode |= F_OK;
	return mode ? 0 : 1;
}
EOCP
	: check sys/file.h first, no particular reason here
	if $test `./findhdr sys/file.h` && \
		$cc -o access $cppflags -DI_SYS_FILE access.c >/dev/null 2>&1 ; then
		h_sysfile=true;
		echo "<sys/file.h> defines the *_OK access constants." >&4
	elif $test `./findhdr fcntl.h` && \
		$cc -o access $cppflags -DI_FCNTL access.c >/dev/null 2>&1 ; then
		h_fcntl=true;
		echo "<fcntl.h> defines the *_OK access constants." >&4
@if I_UNISTD
	elif $test `./findhdr unistd.h` && \
		$cc -o access $cppflags -DI_UNISTD access.c >/dev/null 2>&1 ; then
		echo "<unistd.h> defines the *_OK access constants." >&4
@end
	else
		echo "I can't find the four *_OK access constants--I'll use mine." >&4
	fi
	;;
esac
$rm -f access*