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tcgetpgrp, tcsetpgrp - get and set terminal foreground process group
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 (non-
empty) process group belonging to the same session as the calling
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
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.
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)
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