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Annotation of 43BSDReno/lib/libc/sys/getpgrp.2, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1983 Regents of the University of California.
                      2: .\" All rights reserved.  The Berkeley software License Agreement
                      3: .\" specifies the terms and conditions for redistribution.
                      4: .\"
                      5: .\"    @(#)getpgrp.2   6.3 (Berkeley) 8/26/85
                      6: .\"
                      7: .TH GETPGRP 2 "August 26, 1985"
                      8: .UC 5
                      9: .SH NAME
                     10: getpgrp \- get process group
                     11: .SH SYNOPSIS
                     12: .ft B
                     13: .nf
                     14: pgrp = getpgrp(pid)
                     15: int pgrp;
                     16: int pid;
                     17: .fi
                     18: .ft R
                     19: .SH DESCRIPTION
                     20: The process group of the specified process is returned by
                     21: .I getpgrp.
                     22: If
                     23: .I pid
                     24: is zero, then the call applies to the current process.
                     25: .PP
                     26: Process groups are used for distribution of signals, and
                     27: by terminals to arbitrate requests for their input: processes
                     28: that have the same process group as the terminal are foreground
                     29: and may read, while others will block with a signal if they attempt
                     30: to read.
                     31: .PP
                     32: This call is thus used by programs such as
                     33: .IR csh (1)
                     34: to create
                     35: process groups
                     36: in implementing job control.
                     37: The TIOCGPGRP and TIOCSPGRP calls
                     38: described in
                     39: .IR tty (4)
                     40: are used to get/set the process group of the control terminal.
                     41: .SH "SEE ALSO"
                     42: setpgrp(2), getuid(2), tty(4)

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