1.\" Copyright (c) 2009 Ed Schouten <ed@FreeBSD.org> 2.\" 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.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD: head/lib/libc/gen/tcsetsid.3 191882 2009-05-07 13:49:48Z ed $ 26.\" 27.Dd May 5, 2018 28.Dt TCSETSID 3 29.Os 30.Sh NAME 31.Nm tcsetsid 32.Nd set session ID associated with a controlling terminal 33.Sh LIBRARY 34.Lb libc 35.Sh SYNOPSIS 36.In sys/types.h 37.In termios.h 38.Ft int 39.Fn tcsetsid "int fd" "pid_t pid" 40.Sh DESCRIPTION 41The 42.Fn tcsetsid 43function sets associates a session identified by 44.Fa pid 45with a controlling terminal specified by 46.Fa fd . 47.Pp 48This implementation only allows the controlling terminal to be changed 49by the session leader itself. 50This implies that 51.Fa pid 52always has to be equal to the process ID. 53.Pp 54It is unsupported to associate with a terminal that already has an 55associated session. 56Conversely, it is also unsupported to associate to a terminal when 57the session is already associated with a different terminal. 58.Sh ERRORS 59If an error occurs, 60.Fn tcsetsid 61returns -1 and the global variable 62.Va errno 63is set to indicate the error, as follows: 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 ENOTTY 70The file descriptor represented by 71.Fa fd 72is not a terminal. 73.It Bq Er EINVAL 74The 75.Fa pid 76argument is not equal to the session ID of the calling process. 77.It Bq Er EPERM 78The calling process is not a session leader. 79.It Bq Er EPERM 80The session already has an associated terminal or the terminal already 81has an associated session. 82.El 83.Sh SEE ALSO 84.Xr getsid 2 , 85.Xr setsid 2 , 86.Xr tcgetpgrp 3 , 87.Xr tcgetsid 3 88.Sh HISTORY 89A 90.Fn tcsetsid 91function first appeared in QNX. 92It does not comply to any standard. 93