DragonFly On-Line Manual Pages

GETGROUPS(2)             DragonFly 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
     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_MAX
     will ever be returned.  If gidsetlen is zero, getgroups() returns the
     number of supplementary group IDs associated 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() function call appeared in 4.2BSD.

DragonFly 3.5                    March 5, 1999                   DragonFly 3.5