1/* $NetBSD: tcgetpgrp.c,v 1.8 2003/08/07 16:44:13 agc Exp $ */ 2 3/*- 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32#include <sys/cdefs.h> 33#if defined(LIBC_SCCS) && !defined(lint) 34#if 0 35static char sccsid[] = "@(#)termios.c 8.2 (Berkeley) 2/21/94"; 36#else 37__RCSID("$NetBSD: tcgetpgrp.c,v 1.8 2003/08/07 16:44:13 agc Exp $"); 38#endif 39#endif /* LIBC_SCCS and not lint */ 40 41#include "namespace.h" 42#include <sys/types.h> 43#include <sys/ioctl.h> 44 45#include <assert.h> 46#include <errno.h> 47#include <termios.h> 48#include <unistd.h> 49 50#ifdef __weak_alias 51__weak_alias(tcgetpgrp,_tcgetpgrp) 52#endif 53 54pid_t 55tcgetpgrp(fd) 56 int fd; 57{ 58 int s; 59 60 _DIAGASSERT(fd != -1); 61 62 if (ioctl(fd, TIOCGPGRP, &s) < 0) 63 return ((pid_t)-1); 64 65 if (s == (pid_t)-1) 66 /* SVID requires a number > 1 that isn't a valid PGID... */ 67 s = (uint)(pid_t)~0u >> 1; 68 return ((pid_t)s); 69} 70