getpgrp man page on FreeBSD

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

     getpgrp — get process group

     Standard C Library (libc, -lc)

     #include <unistd.h>


     getpgid(pid_t pid);

     The process group of the current process is returned by getpgrp().	 The
     process group of the process identified by pid is returned by getpgid().
     If pid is zero, getpgid() returns the process group of the current

     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 system 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

     The getpgrp() system call always succeeds.	 Upon successful completion,
     the getpgid() system call returns the process group of the specified
     process; otherwise, it returns a value of -1 and sets errno to indicate
     the error.

     This version of getpgrp() differs from past Berkeley versions by not tak‐
     ing a pid_t pid argument.	This incompatibility is required by ISO/IEC
     9945-1:1990 (“POSIX.1”).

     From the ISO/IEC 9945-1:1990 (“POSIX.1”) Rationale:

     4.3BSD provides a getpgrp() system call 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 AT&T System V UNIX getpgrp() suf‐
     fices, and the added complexity of the 4.3BSD getpgrp() has been omitted
     from POSIX.1.  The old functionality is available from the getpgid() sys‐
     tem call.

     The getpgid() system call will succeed unless:

     [ESRCH]		there is no process whose process ID equals pid

     getsid(2), setpgid(2), termios(4)

     The getpgrp() system call is expected to conform to ISO/IEC 9945-1:1990

     The getpgrp() system call appeared in 4.0BSD.  The getpgid() system call
     is derived from its usage in AT&T System V Release 4 UNIX.

BSD				 June 4, 1993				   BSD

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