1.\" $NetBSD: tcgetsid.3,v 1.3 2002/10/01 18:11:45 wiz Exp $ 2.\" 3.\" Copyright (c) 1991, 1993 4.\" The Regents of the University of California. 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. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)tcgetpgrp.3 8.1 (Berkeley) 6/4/93 35.\" 36.Dd February 13, 1998 37.Dt TCGETSID 3 38.Os 39.Sh NAME 40.Nm tcgetsid 41.Nd get session ID associated with a controlling terminal 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.Fd #include \*[Lt]sys/types.h\*[Gt] 46.Fd #include \*[Lt]unistd.h\*[Gt] 47.Ft pid_t 48.Fn tcgetsid "int fd" 49.Sh DESCRIPTION 50The 51.Nm tcgetsid 52function returns the value of the session ID associated with the specified 53controlling terminal device. 54The session ID is defined as the process group ID of the session leader. 55.Sh ERRORS 56If an error occurs, 57.Nm tcgetsid 58returns -1 and the global variable 59.Va errno 60is set to indicate the error, as follows: 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 ENOTTY 67The calling process does not have a controlling terminal or the 68underlying terminal device represented by 69.Fa fd 70is not the controlling terminal. 71.El 72.Sh SEE ALSO 73.Xr getsid 2 , 74.Xr setsid 2 , 75.Xr tcgetpgrp 3 76.Sh STANDARDS 77The 78.Nm tcgetsid 79function conforms to 80.St -xpg4.2 . 81