getpgrp man page on 4.4BSD

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GETPGRP(2)		    BSD System Calls Manual		    GETPGRP(2)

     getpgrp — get process group

     #include <unistd.h>


     The process group of the current process is returned by getpgrp().

     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 foreground 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 tcgetpgrp() and tcsetpgrp()
     calls are used to get/set the process group of the control terminal.

     setpgid(2), termios(4)

     The getpgrp function call appeared in 4.0BSD.

     The getpgrp() function conforms to IEEE Std 1003.1-1988 (“POSIX”).

     This version of getpgrp() differs from past Berkeley versions by not tak‐
     ing a pid_t pid argument.	This incompatibility is required by IEEE Std
     1003.1-1988 (“POSIX.1”).

     From the IEEE Std 1003.1-1988 (“POSIX.1”) Rationale:

     4.3BSD provides a getpgrp() function that returns the process group ID
     for a specified process.  Although this function is used to support job
     control, all known job-control shells always specify the calling process
     with this function.  Thus, the simpler System V getpgrp() suffices, and
     the added complexity of the 4.3BSD getpgrp() has been omitted from

4.2 Berkeley Distribution	 June 4, 1993	     4.2 Berkeley Distribution

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