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

NAME
     getgroups -- get group access list

LIBRARY
     Standard C	Library	(libc, -lc)

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

     int
     getgroups(int gidsetlen, gid_t *gidset);

DESCRIPTION
     The getgroups() system call gets the current group	access list of the
     user process and stores it	in the array gidset.  The gidsetlen argument
     indicates the number of entries that may be placed	in gidset.  The
     getgroups() system	call returns the actual	number of groups returned in
     gidset.  No more than NGROUPS_MAX will ever be returned.  If gidsetlen is
     zero, getgroups() returns the number of supplementary group IDs associ-
     ated with the calling process without modifying the array pointed to by
     gidset.

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() system call appeared in 4.2BSD.

BSD				 March 5, 1999				   BSD
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY

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