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BSD 2.11 - man page for getgroups (bsd section 2)

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GETGROUPS(2)									     GETGROUPS(2)

       getgroups - get group access list

       #include <sys/param.h>

       ngroups = getgroups(gidsetlen, gidset)
       int ngroups, gidsetlen, *gidset;

       Getgroups  gets	the  current  group  access list of the user process and stores it in the
       array gidset.  The parameter gidsetlen indicates the number of entries that may be  placed
       in  gidset.   Getgroups	returns  the actual number of groups returned in gidset.  No more
       than NGROUPS, as defined in <sys/param.h>, will ever be returned.

       A successful call returns the number of groups in the group set.  A value of -1	indicates
       that an error occurred, and the error code is stored in the global variable errno.

       The possible errors for getgroup are:

       [EINVAL]       The  argument  gidsetlen	is smaller than the number of groups in the group

       [EFAULT]       The argument gidset specifies an invalid address.

       setgroups(2), initgroups(3X)

       The gidset array should be of type gid_t, but remains integer for compatibility with  ear-
       lier systems.

4.2 Berkeley Distribution		   May 13, 1986 			     GETGROUPS(2)
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