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28 .\" @(#)getpgrp.2 8.1 (Berkeley) 6/4/93
43 .Fn getpgid "pid_t pid"
45 The process group of the current process is returned by
47 The process group of the process identified by
55 returns the process group of the current process.
57 Process groups are used for distribution of signals, and
58 by terminals to arbitrate requests for their input: processes
59 that have the same process group as the terminal are foreground
60 and may read, while others will block with a signal if they attempt
63 This system call is thus used by programs such as
67 in implementing job control.
73 are used to get/set the process group of the control terminal.
77 system call always succeeds.
78 Upon successful completion, the
80 system call returns the process group of the specified process;
81 otherwise, it returns a value of \-1 and sets
83 to indicate the error.
87 differs from past Berkeley versions by not taking a
90 This incompatibility is required by
100 system call that returns the process group ID for a specified process.
101 Although this function is used to support job control, all known
102 job-control shells always specify the calling process with this
107 suffices, and the added complexity of the
110 has been omitted from POSIX.1.
111 The old functionality is available from the
121 there is no process whose process ID equals
131 system call is expected to conform to
136 system call appeared in
140 system call is derived from its usage in