linux man page for getpgrp

GETPGRP(P)						     POSIX Programmer's Manual							GETPGRP(P)

NAME
       getpgrp - get the process group ID of the calling process

SYNOPSIS
       #include <unistd.h>

       pid_t getpgrp(void);

DESCRIPTION
       The getpgrp() function shall return the process group ID of the calling process.

RETURN VALUE
       The getpgrp() function shall always be successful and no return value is reserved to indicate an error.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       4.3  BSD  provides a getpgrp() function that returns the process group ID for a specified process. Although this function supports job con-
       trol, 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 4.3 BSD getpgrp() is provided by the XSI extension getpgid().

FUTURE DIRECTIONS
       None.

SEE ALSO
       exec()  ,  fork() , getpgid() , getpid() , getppid() , kill() , setpgid() , setsid() , the Base Definitions volume of IEEE Std 1003.1-2001,
       <sys/types.h>, <unistd.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and  the  original  IEEE
       and  The  Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003								GETPGRP(P)