osf1 man page for getpgid

getpgid(2)							System Calls Manual							getpgid(2)

NAME
       getpgid - Gets process group ID

LIBRARY
       Standard C Library (libc.a)

SYNOPSIS
       #include <sys/types.h>
       #include <unistd.h>
       pid_t getpgid(	   pid_t pid);

PARAMETERS
       Specifies the process ID of the target process; zero implies the calling process.

DESCRIPTION
       The  getpgid()  function returns the process group ID of the process specified by the process ID pid.  Specifying a pid of 0 (zero) returns
       the process group ID of the calling process.

RETURN VALUES
       The getpgid() function returns the process group ID of the process specified.  If there was an error, a value of -1 is returned	and  errno
       is set to indicate the error.

ERRORS
       If  any	of  the following conditions occurs, the getpgid() function sets errno to the corresponding value: The specified process is not in
       the same session as the calling process, and the calling process lacks sufficient privilege to read the specified  process.   As  released,
       Tru64 UNIX does not check the privilege.  No process has been found that has a process ID identical to that specified by the pid parameter.

RELATED INFORMATION
       Functions: exec(2), fork(2), setpgid(2) delim off

																	getpgid(2)