1.\" Copyright (c) 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)tcsetpgrp.3 8.1 (Berkeley) 6/4/93 29.\" $FreeBSD$ 30.\" 31.Dd November 28, 2022 32.Dt TCSETPGRP 3 33.Os 34.Sh NAME 35.Nm tcsetpgrp 36.Nd set foreground process group ID 37.Sh LIBRARY 38.Lb libc 39.Sh SYNOPSIS 40.In unistd.h 41.Ft int 42.Fn tcsetpgrp "int fd" "pid_t pgrp_id" 43.Sh DESCRIPTION 44If the process has a controlling terminal, the 45.Fn tcsetpgrp 46function sets the foreground process group ID associated with the 47terminal device to 48.Fa pgrp_id . 49The terminal device associated with 50.Fa fd 51must be the controlling terminal of the calling process and the 52controlling terminal must be currently associated with the session 53of the calling process. 54The value of 55.Fa pgrp_id 56must be the same as the process group ID of a process in the same 57session as the calling process. 58.Sh RETURN VALUES 59.Rv -std tcsetpgrp 60.Sh ERRORS 61The 62.Fn tcsetpgrp 63function will fail if: 64.Bl -tag -width Er 65.It Bq Er EBADF 66The 67.Fa fd 68argument is not a valid file descriptor. 69.It Bq Er EINVAL 70An invalid value of 71.Fa pgrp_id 72was specified. 73.It Bq Er ENOTTY 74The calling process does not have a controlling terminal, or the file 75represented by 76.Fa fd 77is not the controlling terminal, or the controlling terminal is no 78longer associated with the session of the calling process. 79.It Bq Er EPERM 80The 81.Fa pgrp_id 82argument does not match the process group ID of a process in the same 83session as the calling process. 84.El 85.Sh SEE ALSO 86.Xr setpgid 2 , 87.Xr setsid 2 , 88.Xr tcgetpgrp 3 89.Sh STANDARDS 90The 91.Fn tcsetpgrp 92function is expected to be compliant with the 93.St -p1003.1-88 94specification. 95