?RCS: $Id: d_msem_lck.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: $Log: d_msem_lck.U,v $
?MAKE:d_msem_lck: Trylink cat i_sysmman
?MAKE:	-pick add $@ %<
?S:d_msem_lck:
?S:	This variable conditionally defines HAS_MSEM_LOCK if msem_lock() is
?S:	available, thereby indicating kernel support for memory semaphores.
?S:.
?C:HAS_MSEM_LOCK:
?C:	This symbol, if defined, indicates that memory semaphores are
?C:	available to protect mmap()'ed regions.
?C:.
?H:#$d_msem_lck HAS_MSEM_LOCK		/**/
?H:.
?LINT:set d_msem_lck
: see if msem_lock exists
$cat >try.c <<EOC
#$i_sysmman I_SYS_MMAN
#ifdef I_SYS_MMAN
#include <sys/mman.h>
#endif
int main(void)
{
	static int ret;
	static msemaphore *sem;
	ret |= msem_lock(sem, MSEM_IF_NOWAIT);
	return ret ? 0 : 1;
}
EOC
cyn=msem_lock
set d_msem_lck
eval $trylink