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OpenDarwin 7.2.1 - man page for getgroups (opendarwin section 2)

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

NAME
     getgroups -- get group access list

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

     int
     getgroups(int gidsetlen, gid_t *gidset);

DESCRIPTION
     Getgroups() gets the current group access list of the current 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_MAX} will ever be returned.  If gidsetlen is 0, getgroups() returns the
     number of groups without modifying the gidset array.

RETURN VALUES
     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.

ERRORS
     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.

SEE ALSO
     setgroups(2), initgroups(3)

HISTORY
     The getgroups() function call appeared in 4.2BSD.

4.2 Berkeley Distribution		  April 16, 1994		4.2 Berkeley Distribution
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