1.\" $NetBSD: tcgetpgrp.3,v 1.9 2002/04/29 01:41:46 simonb Exp $ 2.\" 3.\" Copyright (c) 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)tcgetpgrp.3 8.1 (Berkeley) 6/4/93 35.\" 36.Dd June 4, 1993 37.Dt TCGETPGRP 3 38.Os 39.Sh NAME 40.Nm tcgetpgrp 41.Nd get foreground process group ID 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.Fd #include \*[Lt]unistd.h\*[Gt] 46.Ft pid_t 47.Fn tcgetpgrp "int fd" 48.Sh DESCRIPTION 49The 50.Nm tcgetpgrp 51function returns the value of the process group ID of the foreground 52process group associated with the terminal device. 53If there is no foreground process group, 54.Nm tcgetpgrp 55returns an invalid process ID. 56.Sh ERRORS 57If an error occurs, 58.Nm tcgetpgrp 59returns -1 and the global variable 60.Va errno 61is set to indicate the error, as follows: 62.Bl -tag -width Er 63.It Bq Er EBADF 64The 65.Fa fd 66argument is not a valid file descriptor. 67.It Bq Er ENOTTY 68The calling process does not have a controlling terminal or the 69underlying terminal device represented by 70.Fa fd 71is not the controlling terminal. 72.El 73.Sh SEE ALSO 74.Xr setpgid 2 , 75.Xr setsid 2 , 76.Xr tcsetpgrp 3 77.Sh STANDARDS 78The 79.Nm tcgetpgrp 80function conforms to 81.St -p1003.1-90 . 82