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28 .\" @(#)getpgrp.2 8.1 (Berkeley) 6/4/93
44 .Fn getpgid "pid_t pid"
46 The process group of the current process is returned by
48 The process group of the process identified by
56 returns the process group of the current process.
58 Process groups are used for distribution of signals, and
59 by terminals to arbitrate requests for their input: processes
60 that have the same process group as the terminal are foreground
61 and may read, while others will block with a signal if they attempt
64 This system call is thus used by programs such as
68 in implementing job control.
74 are used to get/set the process group of the control terminal.
78 system call always succeeds.
79 Upon successful completion, the
81 system call returns the process group of the specified process;
82 otherwise, it returns a value of \-1 and sets
84 to indicate the error.
88 differs from past Berkeley versions by not taking a
91 This incompatibility is required by
101 system call that returns the process group ID for a specified process.
102 Although this function is used to support job control, all known
103 job-control shells always specify the calling process with this
108 suffices, and the added complexity of the
111 has been omitted from POSIX.1.
112 The old functionality is available from the
122 there is no process whose process ID equals
132 system call is expected to conform to
137 system call appeared in
141 system call is derived from its usage in