/* Returns information about the group with specified String name, as found 
 * in /etc/group.
 *
 * The information is returned as a Struct::Group; see getgrent above for
 * details.
 *
 * e.g.  Etc.getgrnam('users') -> #<struct Struct::Group name="users",
 * passwd="x", gid=100, mem=["meta", "root"]>
 *
 */
static VALUE
etc_getgrnam(VALUE obj, VALUE nam)
{
#ifdef HAVE_GETGRENT
    struct group *grp;

    rb_secure(4);
    SafeStringValue(nam);
    grp = getgrnam(RSTRING_PTR(nam));
    if (grp == 0) rb_raise(rb_eArgError, "can't find group for %s", RSTRING_PTR(nam));
    return setup_group(grp);
#else
    return Qnil;
#endif
}