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.\" 30.Dd November 28, 2022 31.Dt TCSETPGRP 3 32.Os 33.Sh NAME 34.Nm tcsetpgrp 35.Nd set foreground process group ID 36.Sh LIBRARY 37.Lb libc 38.Sh SYNOPSIS 39.In unistd.h 40.Ft int 41.Fn tcsetpgrp "int fd" "pid_t pgrp_id" 42.Sh DESCRIPTION 43If the process has a controlling terminal, the 44.Fn tcsetpgrp 45function sets the foreground process group ID associated with the 46terminal device to 47.Fa pgrp_id . 48The terminal device associated with 49.Fa fd 50must be the controlling terminal of the calling process and the 51controlling terminal must be currently associated with the session 52of the calling process. 53The value of 54.Fa pgrp_id 55must be the same as the process group ID of a process in the same 56session as the calling process. 57.Sh RETURN VALUES 58.Rv -std tcsetpgrp 59.Sh ERRORS 60The 61.Fn tcsetpgrp 62function will fail if: 63.Bl -tag -width Er 64.It Bq Er EBADF 65The 66.Fa fd 67argument is not a valid file descriptor. 68.It Bq Er EINVAL 69An invalid value of 70.Fa pgrp_id 71was specified. 72.It Bq Er ENOTTY 73The calling process does not have a controlling terminal, or the file 74represented by 75.Fa fd 76is not the controlling terminal, or the controlling terminal is no 77longer associated with the session of the calling process. 78.It Bq Er EPERM 79The 80.Fa pgrp_id 81argument does not match the process group ID of a process in the same 82session as the calling process. 83.El 84.Sh SEE ALSO 85.Xr setpgid 2 , 86.Xr setsid 2 , 87.Xr tcgetpgrp 3 88.Sh STANDARDS 89The 90.Fn tcsetpgrp 91function is expected to be compliant with the 92.St -p1003.1-88 93specification. 94