tcgetpgrp, tcsetpgrp — get and set terminal foreground process group
#include <unistd.h>
pid_t
tcgetpgrp( |
int fd); |
int
tcsetpgrp( |
int fd, |
pid_t pgrp); |
The function tcgetpgrp()
returns the process group ID of the foreground process group
on the terminal associated to fd, which must be the
controlling terminal of the calling process.
The function tcsetpgrp()
makes the process group with process group ID pgrp the foreground process
group on the terminal associated to fd, which must be the
controlling terminal of the calling process, and still be
associated with its session. Moreover, pgrp must be a (nonempty)
process group belonging to the same session as the calling
process.
If tcsetpgrp() is called by
a member of a background process group in its session, and
the calling process is not blocking or ignoring SIGTTOU, a SIGTTOU signal is sent to all members of
this background process group.
When fd refers to
the controlling terminal of the calling process, the function
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 fd does not refer to the
controlling terminal of the calling process, −1 is
returned, and errno is set
appropriately.
When successful, tcsetpgrp()
returns 0. Otherwise, it returns −1, and errno is set appropriately.
fd is not a
valid file descriptor.
pgrp has an
unsupported value.
The calling process does not have a controlling
terminal, or it has one but it is not described by
fd, or, for
tcsetpgrp(), this
controlling terminal is no longer associated with the
session of the calling process.
pgrp has a
supported value, but is not the process group ID of a
process in the same session as the calling process.
This page is part of release 3.33 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at http://man7.org/linux/man-pages/.
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Copyright (C) 2002 Andries Brouwer <aebcwi.nl> Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. |