| NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON | The Linux Programming Interface |
TCGETPGRP(3) Linux Programmer's Manual TCGETPGRP(3)
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.
EBADF fd is not a valid file descriptor.
EINVAL pgrp has an unsupported value.
ENOTTY 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.
EPERM pgrp has a supported value, but is not the process group ID of a
process in the same session as the calling process.
POSIX.1-2001.
These functions are implemented via the TIOCGPGRP and TIOCSPGRP ioctls.
The ioctls appeared in 4.2BSD. The functions are POSIX inventions.
setpgid(2), setsid(2), credentials(7)
This page is part of release 3.32 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
GNU 2003-01-28 TCGETPGRP(3)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface