4.3BSD/usr/ingres/source/ctlmod/readmon.c

# include	"ctlmod.h"
# include	"pipes.h"
# include	<sccs.h>

SCCSID(@(#)readmon.c	8.1	12/31/84)

/*
**  READMON -- Read bytes from tty monitor
**
**	This routine is a cludge.  It will exist only in version
**	6.3 with split monitor/parser.  The purpose is to get
**	around the problem caused by the monitor not outputting
**	text in one of the basic internal data types.  What it
**	can do is to output no parameters & terminate with a
**	PV_EOF.  This doesn't flush the pipe, so it can continue
**	with plain text.  This routine retrieves that text.
**	The name "readmon" is somewhat of a misnomer -- it is
**	not restricted to the monitor, & does not necessarily
**	read from the monitor; but this routine should only
**	be called from the parser on the monitor pipe.
**
**	Parameters:
**		buf -- a buffer to read into.
**		nbytes -- the max number of bytes to read.
**
**	Returns:
**		The actual number of bytes read.
**		zero on eof.
**
**	Side Effects:
**		none.
**
**	NOTE:
**		When this routine is eliminated, so should the
**		'cm_monppb' field of the Cm struct and the code
**		in proc_err to flush the monitor input pipe.
**
**	Trace Flags:
**		none.
*/

pb_t	*MonPpb;	/* pointer to ppb for monitor */

readmon(buf, nbytes)
char	*buf;
int	nbytes;
{
	Cm.cm_input = Cm.cm_rinput;
	return (pb_get(MonPpb, buf, nbytes));
}