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32 .\" @(#)getpgrp.2 8.1 (Berkeley) 6/4/93
33 .\" $FreeBSD: src/lib/libc/sys/getpgrp.2,v 1.11.2.6 2001/12/14 18:34:00 ru Exp $
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50 .Fn getpgid "pid_t pid"
52 The process group of the current process is returned by
54 The process group of the process identified by
62 returns the process group of the current process.
64 Process groups are used for distribution of signals, and
65 by terminals to arbitrate requests for their input: processes
66 that have the same process group as the terminal are foreground
67 and may read, while others will block with a signal if they attempt
70 This call is thus used by programs such as
74 in implementing job control.
80 are used to get/set the process group of the control terminal.
85 Upon successful completion, the
87 call returns the process group of the specified process;
88 otherwise, it returns a value of \-1 and sets
90 to indicate the error.
94 differs from past Berkeley versions by not taking a
97 This incompatibility is required by
107 function that returns the process group ID for a specified process.
108 Although this function is used to support job control, all known
109 job-control shells always specify the calling process with this
114 suffices, and the added complexity of the
117 has been omitted from POSIX.1.
118 The old functionality is available from the
126 there is no process whose process ID equals
136 function call is expected to conform to
141 function call appeared in
145 function call is derived from its usage in System V Release 4.