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.Dd November 28, 2022 29.Dt TCSETPGRP 3 30.Os 31.Sh NAME 32.Nm tcsetpgrp 33.Nd set foreground process group ID 34.Sh LIBRARY 35.Lb libc 36.Sh SYNOPSIS 37.In unistd.h 38.Ft int 39.Fn tcsetpgrp "int fd" "pid_t pgrp_id" 40.Sh DESCRIPTION 41If the process has a controlling terminal, the 42.Fn tcsetpgrp 43function sets the foreground process group ID associated with the 44terminal device to 45.Fa pgrp_id . 46The terminal device associated with 47.Fa fd 48must be the controlling terminal of the calling process and the 49controlling terminal must be currently associated with the session 50of the calling process. 51The value of 52.Fa pgrp_id 53must be the same as the process group ID of a process in the same 54session as the calling process. 55.Sh RETURN VALUES 56.Rv -std tcsetpgrp 57.Sh ERRORS 58The 59.Fn tcsetpgrp 60function will fail if: 61.Bl -tag -width Er 62.It Bq Er EBADF 63The 64.Fa fd 65argument is not a valid file descriptor. 66.It Bq Er EINVAL 67An invalid value of 68.Fa pgrp_id 69was specified. 70.It Bq Er ENOTTY 71The calling process does not have a controlling terminal, or the file 72represented by 73.Fa fd 74is not the controlling terminal, or the controlling terminal is no 75longer associated with the session of the calling process. 76.It Bq Er EPERM 77The 78.Fa pgrp_id 79argument does not match the process group ID of a process in the same 80session as the calling process. 81.El 82.Sh SEE ALSO 83.Xr setpgid 2 , 84.Xr setsid 2 , 85.Xr tcgetpgrp 3 86.Sh STANDARDS 87The 88.Fn tcsetpgrp 89function is expected to be compliant with the 90.St -p1003.1-88 91specification. 92