?RCS: $Id: d_lockf.U 167 2013-05-08 17:58:00Z rmanfredi $
?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: Original Author: Andy Dougherty <doughera@lafcol.lafayette.edu>
?RCS:
?RCS: $Log: d_lockf.U,v $
?RCS: Revision 3.0.1.1  1994/08/29  16:09:36  ram
?RCS: patch32: created by ADO
?RCS:
?MAKE:d_lockf: Trylink cat i_unistd
?MAKE:	-pick add $@ %<
?S:d_lockf:
?S:	This variable conditionally defines HAS_LOCKF if lockf() is
?S:	available to do file locking.
?S:.
?C:HAS_LOCKF (LOCKF):
?C:	This symbol, if defined, indicates that the lockf routine is
?C:	available to do file locking.
?C:.
?H:#$d_lockf HAS_LOCKF		/**/
?H:.
?LINT:set d_lockf
: see if lockf exists
$cat >try.c <<EOC
#include <sys/types.h>
#$i_unistd I_UNISTD
#ifdef I_UNISTD
#include <unistd.h>
#endif
int main(void)
{
	static int fd, ret;
	static off_t size;
	ret |= lockf(fd, F_ULOCK, size);
	ret |= lockf(fd, F_LOCK, size);
	ret |= lockf(fd, F_TLOCK, size);
	ret |= lockf(fd, F_TEST, size);
	return ret ? 0 : 1;
}
EOC
cyn=lockf
set d_lockf
eval $trylink