.\" Copyright (c) 2002 Apple Computer, Inc. All rights reserved. .\" .\" @APPLE_LICENSE_HEADER_START@ .\" .\" The contents of this file constitute Original Code as defined in and .\" are subject to the Apple Public Source License Version 1.1 (the .\" "License"). You may not use this file except in compliance with the .\" License. Please obtain a copy of the License at .\" http://www.apple.com/publicsource and read it before using this file. .\" .\" This Original Code and all software distributed under the License are .\" distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER .\" EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, .\" INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, .\" FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the .\" License for the specific language governing rights and limitations .\" under the License. .\" .\" @APPLE_LICENSE_HEADER_END@ .\" .Dd December 20, 2003 .Dt tcgetsid 3 .Os .Sh NAME .Nm tcgetsid .Nd get the process group ID for the session leader for the controlling terminal .Sh SYNOPSIS .In termios.h .Ft pid_t .Fo tcgetsid .Fa "int fildes" .Fc .Sh DESCRIPTION The .Fn tcgetsid function obtains the process group ID of the session for which the terminal specified by .Fa fildes is the controlling terminal. .Sh RETURN VALUES Upon successful completion, .Fn tcgetsid returns the process group ID associated with the terminal. Otherwise, a value of .Po Vt pid_t Pc Ns -1 is returned and .Va errno is set to indicate the error. .Sh ERRORS The .Fn tcgetsid function will fail if: .Bl -tag -width Er .It Bq Er EACCES The .Vt fildes argument is not associated with a controlling terminal. .It Bq Er EBADF The .Vt fildes argument is not a valid file descriptor. .It Bq Er ENOTTY The file associated with .Vt fildes is not a terminal. .El .Sh SEE ALSO .Xr getsid 2 , .Xr setpgid 2 , .Xr setsid 2 , .Xr tcgetpgrp 3 , .Xr termios 4 .Sh STANDARDS The .Fn tcgetsid function conforms to .St -p1003.1-2001 .