GETPGRP(2)	    UNIX Programmer's Manual	       GETPGRP(2)

     getpgrp - get process group

     pgrp = getpgrp(pid)
     int pgrp;
     int pid;

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

     Process groups are used for distribution of signals, and by
     terminals to arbitrate requests for their input: processes
     that have the same process group as the terminal are fore-
     ground and may read, while others will block with a signal
     if they attempt to read.

     This call is thus used by programs such as 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.

     setpgrp(2), getuid(2), tty(4)

Printed 11/26/99	 August 26, 1985			1

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