Section (3) tcgetpgrp
tcgetpgrp, tcsetpgrp — get and set terminal foreground process group
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.
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
tcsetpgrp() is called by
a member of a background process group in its session, and
the calling process is not blocking or ignoring
SIGTTOU signal is sent to all members of
this background process group.
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
errno is set
returns 0. Otherwise, it returns −1, and
errno is set appropriately.
fdis not a valid file descriptor.
pgrphas 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.
pgrphas a supported value, but is not the process group ID of a process in the same session as the calling process.
For an explanation of the terms used in this section, see attributes(7).
These functions are implemented via the
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