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-'\" t
-.\" Copyright (C) 2002 Andries Brouwer <aeb@cwi.nl>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH tcgetpgrp 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-tcgetpgrp, tcsetpgrp \- get and set terminal foreground process group
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B "#include <unistd.h>"
-.P
-.BI "pid_t tcgetpgrp(int " fd );
-.BI "int tcsetpgrp(int " fd ", pid_t " pgrp );
-.fi
-.SH DESCRIPTION
-The function
-.BR tcgetpgrp ()
-returns the process group ID of the foreground process group on the
-terminal associated to
-.IR fd ,
-which must be the controlling terminal of the calling process.
-.\" The process itself may be a background process.
-.P
-The function
-.BR tcsetpgrp ()
-makes the process group with process group ID
-.I pgrp
-the foreground process group on the terminal associated to
-.IR fd ,
-which must be the controlling terminal of the calling process,
-and still be associated with its session.
-Moreover,
-.I pgrp
-must be a (nonempty) process group belonging to
-the same session as the calling process.
-.P
-If
-.BR tcsetpgrp ()
-is called by a member of a background process group in its session,
-and the calling process is not blocking or ignoring
-.BR SIGTTOU ,
-a
-.B SIGTTOU
-signal is sent to all members of this background process group.
-.SH RETURN VALUE
-When
-.I fd
-refers to the controlling terminal of the calling process,
-the function
-.BR tcgetpgrp ()
-will return the foreground process group ID of that terminal
-if there is one, and some value larger than 1 that is not
-presently a process group ID otherwise.
-When
-.I fd
-does not refer to the controlling terminal of the calling process,
-\-1 is returned, and
-.I errno
-is set to indicate the error.
-.P
-When successful,
-.BR tcsetpgrp ()
-returns 0.
-Otherwise, it returns \-1, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EBADF
-.I fd
-is not a valid file descriptor.
-.TP
-.B EINVAL
-.I pgrp
-has an unsupported value.
-.TP
-.B ENOTTY
-The calling process does not have a controlling terminal, or
-it has one but it is not described by
-.IR fd ,
-or, for
-.BR tcsetpgrp (),
-this controlling terminal is no longer associated with the session
-of the calling process.
-.TP
-.B EPERM
-.I pgrp
-has a supported value, but is not the process group ID of a
-process in the same session as the calling process.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR tcgetpgrp (),
-.BR tcsetpgrp ()
-T}	Thread safety	MT-Safe
-.TE
-.SH VERSIONS
-These functions are implemented via the
-.B TIOCGPGRP
-and
-.B TIOCSPGRP
-ioctls.
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.P
-The ioctls appeared in 4.2BSD.
-The functions are POSIX inventions.
-.SH SEE ALSO
-.BR setpgid (2),
-.BR setsid (2),
-.BR credentials (7)