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@(#)setpgid.2 4.1 (Berkeley) 05/09/85

C 4 setpgrp, getpgrp - set/get process group int getpgrp(pid)

setpgrp(pid, pgrp)

cc ... -ljobs

The process group of the specified process is returned by getpgrp. Setpgrp sets the process group of the specified process pid to the specified pgrp. If pid is zero, then the call applies to the current process.

If the invoker is not the super-user, then the affected process must have the same effective user-id as the invoker or be a descendant of the invoking process.

This call is used by csh (1) to create process groups in implementing job control. The TIOCGPGRP and TIOCSPGRP calls described in tty (4) are used to get/set the process group of the control terminal.

See jobs(3) for a general discussion of job control.

jobs(3), getuid(2), tty(4) The job control facilities are not available in standard version 7 UNIX. These facilities are still under development and may change in future releases of the system as better inter-process communication facilities and support for virtual terminals become available. The options and specifications of these system calls and even the calls themselves are thus subject to change.

A system call setpgrp has been implemented in other versions of UNIX which are not widely used outside of Bell Laboratories; these implementations have, in general, slightly different semantics.