BSD 2.11 - man page for getpgrp (bsd section 2)
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getpgrp - get process group
pgrp = getpgrp(pid)
The process group of the specified process is returned by getpgrp. If pid is zero, then
the call applies to the current process.
Process groups are used for distribution of signals, and by terminals to arbitrate
requests for their input: processes that have the same process group as the terminal are
foreground and may read, while others will block with a signal if they attempt to read.
This call is thus used by programs such as csh(1) to create process groups in implementing
job control. The TIOCGPGRP and TIOCSPGRP calls described in tty(4) are used to get/set
the process group of the control terminal.
setpgrp(2), getuid(2), tty(4)
4.2 Berkeley Distribution August 26, 1985 GETPGRP(2)
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