getgroups man page on 4.4BSD

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GETGROUPS(2)		    BSD System Calls Manual		  GETGROUPS(2)

     getgroups — get group access list

     #include <sys/param.h>
     #include <unistd.h>

     getgroups(int gidsetlen, gid_t *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 getgroups() are:

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

     [EFAULT]		The argument gidset specifies an invalid address.

     setgroups(2), initgroups(3)

     The getgroups function call appeared in 4.2BSD.

4.2 Berkeley Distribution	April 16, 1994	     4.2 Berkeley Distribution

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