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XAddHost(3)                     XLIB FUNCTIONS                     XAddHost(3)




NAME

       XAddHost, XAddHosts, XListHosts, XRemoveHost, XRemoveHosts, XSetAccess-
       Control,  XEnableAccessControl,  XDisableAccessControl,   XHostAddress,
       XServerInterpretedAddress - control host access and host control struc-
       ture


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 XListHosts function returns the current access control list as well
       as  whether the use of the list at connection setup was enabled or dis-
       abled.  XListHosts allows a program to find out what machines can  make
       connections.   It  also  returns a pointer to a list of host structures
       that were allocated by the function.  When no longer needed, this  mem-
       ory should be freed by calling XFree.

       The  XRemoveHost  function  removes  the specified host from the access
       control list for that display.  The 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.

       XRemoveHost 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, FamilyInternet6,
       FamilyServerInterpreted, FamilyDECnet, or FamilyChaos.  The length mem-
       ber  specifies  the length of the address in bytes.  The address member
       specifies a pointer to the address.

       For the ServerInterpreted family, the length is ignored and the address
       member is a pointer to a XServerInterpretedAddress structure which con-
       tains:

       typedef struct {
               int typelength;         /* length of type string, in bytes */
               int valuelength;        /* length of value string, in bytes */
               char *type;             /* pointer to where to  find  the  type
       string */
               char *value;            /* pointer to where to find the address
       */ } XServerInterpretedAddress;

       The type and value members point to strings representing the  type  and
       value  of the server interpreted entry.  These strings may not be NULL-
       terminated so care should be used when accessing them.  The  typelength
       and  valuelength  members  specify  the  length in byte of the type and
       value strings.


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(3)
       Xlib - C Language X Interface



X Version 11                     libX11 1.6.9                      XAddHost(3)

xorg-libX11 1.6.9 - Generated Wed Oct 23 18:34:29 CDT 2019
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