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.\" 4. 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.\" @(#)tcgetpgrp.3 8.1 (Berkeley) 6/4/93 29.\" $FreeBSD$ 30.\" 31.Dd June 4, 1993 32.Dt TCGETPGRP 3 33.Os 34.Sh NAME 35.Nm tcgetpgrp 36.Nd get foreground process group ID 37.Sh LIBRARY 38.Lb libc 39.Sh SYNOPSIS 40.In sys/types.h 41.In unistd.h 42.Ft pid_t 43.Fn tcgetpgrp "int fd" 44.Sh DESCRIPTION 45The 46.Fn tcgetpgrp 47function returns the value of the process group ID of the foreground 48process group associated with the terminal device. 49If there is no foreground process group, 50.Fn tcgetpgrp 51returns an invalid process ID. 52.Sh ERRORS 53If an error occurs, 54.Fn tcgetpgrp 55returns -1 and the global variable 56.Va errno 57is set to indicate the error, as follows: 58.Bl -tag -width Er 59.It Bq Er EBADF 60The 61.Fa fd 62argument is not a valid file descriptor. 63.It Bq Er ENOTTY 64The calling process does not have a controlling terminal or the 65underlying terminal device represented by 66.Fa fd 67is not the controlling terminal. 68.El 69.Sh SEE ALSO 70.Xr setpgid 2 , 71.Xr setsid 2 , 72.Xr tcsetpgrp 3 73.Sh STANDARDS 74The 75.Fn tcgetpgrp 76function is expected to be compliant with the 77.St -p1003.1-88 78specification. 79