hpux man page for getgroups

getgroups(2)							System Calls Manual						      getgroups(2)

NAME
       getgroups - get group access list

SYNOPSIS
DESCRIPTION
       gets  the  current  group access list of the user process and stores it in the array gidset.  The parameter ngroups indicates the number of
       entries which may be placed in gidset.

       As a special case, if the ngroups argument is zero, returns the number of group entries for the process.  In this case, the  array  pointed
       to by the gidset argument is not modified.

EXAMPLES
       The following call to (see getgroups(2)) retrieves the group access list of the calling process and stores the group ids in array mygidset:

RETURN VALUE
       If  successful,	returns  a  non-negative value indicating the number of elements returned in gidset.  If an error occurs, a value of -1 is
       returned and is set to indicate the type of error.

ERRORS
       fails if any of the following conditions are encountered:

       gidset	      specifies an invalid address.  The reliable detection of this error is implementation dependent.

       The argument   ngroups is not zero and is less than the number of groups in the current group access list of the process.

AUTHOR
       was developed by HP and the University of California, Berkeley.

SEE ALSO
       setgroups(2), sysconf(2), initgroups(3C).

STANDARDS CONFORMANCE
																      getgroups(2)