control host access and host control structure

SYNTAX

       int XAddHost(Display *display, XHostAddress *host);

       int XAddHosts(Display *display, XHostAddress *hosts, int num_hosts);

       XHostAddress *XListHosts(Display *display, int *nhosts_return, Bool
              state_return);

       int XRemoveHost(Display *display, XHostAddress *host);

       int XRemoveHosts(Display *display, XHostAddress *hosts, int num_hosts);

       int XSetAccessControl(Display *display, int mode);

       int XEnableAccessControl(Display *display);

       int XDisableAccessControl(Display *display);

ARGUMENTS

       display   Specifies the connection to the X server.

       host      Specifies the host that is to be added or removed.

       hosts     Specifies each host that is to be added or removed.

       mode      Specifies the mode.  You can pass EnableAccess or DisableAc-
                 cess.

       nhosts_return
                 Returns the number of hosts currently in the access control
                 list.

       num_hosts Specifies the number of hosts.

       state_return
                 Returns the state of the access control.

DESCRIPTION

       The XAddHost function adds the specified host to the access control
       list for that display.  The server must be on the same host as the
       client issuing the command, or a BadAccess error results.

       XAddHost can generate BadAccess and BadValue errors.

       The XAddHosts function adds each specified host to the access control
       list for that display.  The server must be on the same host as the
       client issuing the command, or a BadAccess error results.

       XAddHosts can generate BadAccess and BadValue errors.


       The XRemoveHosts function removes each specified host from the access
       control list for that display.  The X server must be on the same host
       as the client process, or a BadAccess error results.  If you remove
       your machine from the access list, you can no longer connect to that
       server, and this operation cannot be reversed unless you reset the
       server.

       XRemoveHosts can generate BadAccess and BadValue errors.

       The XSetAccessControl function either enables or disables the use of
       the access control list at each connection setup.

       XSetAccessControl can generate BadAccess and BadValue errors.

       The XEnableAccessControl function enables the use of the access control
       list at each connection setup.

       XEnableAccessControl can generate a BadAccess error.

       The XDisableAccessControl function disables the use of the access con-
       trol list at each connection setup.

       XDisableAccessControl can generate a BadAccess error.

STRUCTURES

       The XHostAddress structure contains:

       typedef struct {
            int family;              /* for example FamilyInternet */
            int length;              /* length of address, in bytes */
            char *address;           /* pointer to where to find the address */
       } XHostAddress;

       The family member specifies which protocol address family to use (for
       example, TCP/IP or DECnet) and can be FamilyInternet, FamilyDECnet, or
       FamilyChaos.  The length member specifies the length of the address in
       bytes.  The address member specifies a pointer to the address.

DIAGNOSTICS

       BadAccess A client attempted to modify the access control list from
                 other than the local (or otherwise authorized) host.

       BadValue  Some numeric value falls outside the range of values accepted
                 by the request.  Unless a specific range is specified for an
                 argument, the full range defined by the argument's type is
                 accepted.  Any argument defined as a set of alternatives can
                 generate this error.

SEE ALSO

       XFree(3X11)
       Xlib - C Language X Interface