/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1997 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
/*
* University Copyright- Copyright (c) 1982, 1986, 1988
* The Regents of the University of California
* All Rights Reserved
*
* University Acknowledgment- Portions of this document are derived from
* software developed by the University of California, Berkeley, and its
* contributors.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*LINTLIBRARY*/
#include <unistd.h>
#include "curses_inc.h"
/*
* Set the file descriptor for typeahead checks to fd. fd can be -1
* to disable the checking.
*/
int
{
#ifdef SYSV
/*
* Doing fcntls before and after each typeahead check
* read is a serious problem on the 3b2. Profiling
* results indicated that a simple program(edit.c from
* "The New Curses and Terminfo Package") was spending
* 9.2% of the time in fcntl().
*/
#include <fcntl.h>
/* Close the previous duped file descriptor. */
if (savefd >= 0)
/*
* Duplicate the file descriptor so we have one to play with.
* We cannot use dup(2), unfortunately, so we do typeahead checking
* on terminals only. Besides, if typeahead is done when input is
* coming from a file, nothing would EVER get drawn on the screen!
*/
/* MODIFIED: DRS 3/26/89 */
/*
* a couple of notes by DRS: first, a new file descriptor is
* required, since O_NDELAY must be set. calling fcntl() or dup()
* would provide a new file descriptor, but NOT a new file pointer
* for the open file (by file pointer, i mean a unix kernal file
* ptr). if a new underlying unix file ptr. is not allocated,
* setting O_NDELAY will cause all normal terminal i/o to return
* prematurely without blocking.
*
* used instead. calling ttyname is quite expensive -- especially
* for large /dev directories.
*
* note also that the code for the '#else' clause will not work
* since the new file descriptor MUST have O_NDELAY set for the
* rest of libcurses code to function properly.
*
* 4/24/89: modified to set the close on exec() flag of the newly
* opened file descriptor
*/
/*
* cur_term->_check_fd = (tty = ttyname(fd)) ?
* open(tty, O_RDONLY | O_NDELAY) : -1;
*/
O_NDELAY)) >= 0)
} else
#else /* SYSV */
/* Only do typeahead checking if the input is a tty. */
else
#endif /* SYSV */
return (savefd);
}