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getpgrp.0
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GETPGRP(2) UNIX Programmer's Manual GETPGRP(2)
NNAAMMEE
ggeettppggrrpp - get process group
SSYYNNOOPPSSIISS
##iinncclluuddee <<uunniissttdd..hh>>
_p_i_d___t
ggeettppggrrpp(_v_o_i_d)
DDEESSCCRRIIPPTTIIOONN
The process group of the current process is returned by ggeettppggrrpp().
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 ttccggeettppggrrpp() and ttccsseettppggrrpp()
calls are used to get/set the process group of the control terminal.
SSEEEE AALLSSOO
setpgid(2), termios(4)
HHIISSTTOORRYY
The ggeettppggrrpp() function call appeared in 4.0BSD.
SSTTAANNDDAARRDDSS
The ggeettppggrrpp() function conforms to IEEE Std1003.1-1988 (``POSIX'').
CCOOMMPPAATTIIBBIILLIITTYY
This version of ggeettppggrrpp() differs from past Berkeley versions by not tak-
ing a _p_i_d___t _p_i_d argument. This incompatibility is required by IEEE
Std1003.1-1988 (``POSIX'').
From the IEEE Std1003.1-1988 (``POSIX'') Rationale:
4.3BSD provides a ggeettppggrrpp() function that returns the process group ID
for a specified process. Although this function is used to support job
control, all known job-control shells always specify the calling process
with this function. Thus, the simpler System V ggeettppggrrpp() suffices, and
the added complexity of the 4.3BSD ggeettppggrrpp() has been omitted from
POSIX.1.
4.2 Berkeley Distribution June 4, 1993 1