1.\" $OpenBSD: tcgetpgrp.3,v 1.11 2023/01/12 12:56:07 jsg Exp $ 2.\" 3.\" Copyright (c) 1991 The Regents of the University of California. 4.\" 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. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.Dd $Mdocdate: January 12 2023 $ 31.Dt TCGETPGRP 3 32.Os 33.Sh NAME 34.Nm tcgetpgrp 35.Nd get foreground process group ID 36.Sh SYNOPSIS 37.In unistd.h 38.Ft pid_t 39.Fn tcgetpgrp "int fd" 40.Sh DESCRIPTION 41The 42.Fn tcgetpgrp 43function returns the value of the process group ID of the foreground 44process group associated with the terminal device. 45If there is no foreground process group, 46.Fn tcgetpgrp 47returns an invalid process ID. 48.Sh ERRORS 49If an error occurs, 50.Fn tcgetpgrp 51returns \-1 and the global variable 52.Va errno 53is set to indicate the error, as follows: 54.Bl -tag -width Er 55.It Bq Er EBADF 56The 57.Fa fd 58argument is not a valid file descriptor. 59.It Bq Er ENOTTY 60The calling process does not have a controlling terminal or the 61underlying terminal device represented by 62.Fa fd 63is not the controlling terminal. 64.El 65.Sh SEE ALSO 66.Xr setpgid 2 , 67.Xr setsid 2 , 68.Xr tcsetpgrp 3 69.Sh STANDARDS 70The 71.Fn tcgetpgrp 72function is compliant with the 73.St -p1003.1-88 74specification. 75