?RCS: $Id: d_backtrace.U 65 2011-01-01 22:01:00Z rmanfredi $
?RCS:
?RCS: Copyright (c) 2011, Raphael Manfredi
?RCS: Copyright (c) 2011, Christian Biere
?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_semget.U,v $
?RCS:
?MAKE:d_ttyname: Trylink cat i_unistd
?MAKE:	-pick add $@ %<
?S:d_ttyname:
?S:	This variable conditionally defines the HAS_TTYNAME symbol, which
?S:	indicates to the C program that the ttyname() routine is available
?S:	to determine the pathname of the terminal associated with
?S:     a file descriptor.
?S:.
?C:HAS_TTYNAME:
?C:	This symbol, if defined, indicates that the ttyname() routine is
?C:	available to determine the pathname of the terminal associated with
?C:	a file descriptor.  The <unistd.h> header must be included to use
?C:	this routine.
?C:.
?H:#$d_ttyname HAS_TTYNAME	/**/
?H:.
?LINT:set d_ttyname
: see if ttyname exists
$cat >try.c <<EOC
#$i_unistd I_UNISTD
#ifdef I_UNISTD
#include <unistd.h>
#endif
int main(void)
{
	char *name = ttyname(1);
	char c = *ttyname(2);
	return name[0] == c ? 0 : 1;
}
EOC
cyn=ttyname
set d_ttyname
eval $trylink