XAddHost(3)

NAME
XAddHost, XAddHosts, XListHosts, XRemoveHost, XRemoveHosts, XSetAccessControl, XEnableAccessControl, XDisableAccessControl, XHostAddress, XServerInterpretedAddress - 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 or

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 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 error results.

can generate and errors.

The 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 error results.

can generate and errors.

The function returns the current access control list as well as whether the use of the list at connection setup was enabled or disabled. 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 memory should be freed by calling

The 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 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.

can generate and errors.

The 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 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.

can generate and errors.

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

can generate and errors.

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

can generate a error.

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

can generate a error.

STRUCTURES
The 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 or The length member 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 structure which contains:

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

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

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