XAddHost()

NAME

XAddHost(), XAddHosts(), XListHosts(), XRemoveHost(), XRemoveHosts(), XSetAccessControl(), XEnableAccessControl(), XDisableAccessControl(), XHostAddress() - control host access and host control structure

SYNOPSIS

XAddHost (Display *display, XHostAddress *host)
XAddHosts (Display *display, XHostAddress *hosts, int num_hosts)
XHostAddress *XListHosts (Display *display, int *nhosts_return,
						Bool *state_return)
XRemoveHost (Display *display, XHostAddress *host)
XRemoveHosts (Display *display, XHostAddress *hosts, int num_hosts)
XSetAccessControl (Display *display, int mode)
XEnableAccessControl (Display *display)
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 DisableAccess, defined in <X11/X.h>:

#define EnableAccess  1
#define DisableAccess 0

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(3) 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.

The XAddHosts(3) 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.

The XListHosts(3) function returns the current access control list as well as whether the use of the list at connection setup was enabled or disabled. XListHosts(3) allows a program to find out what computers 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 XFree(3).

The XRemoveHost(3) 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 computer from the access list, you can no longer connect to that server, and this operation cannot be reversed unless you reset the server.

The XRemoveHosts(3) 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 computer from the access list, you can no longer connect to that server, and this operation cannot be reversed unless you reset the server.

XRemoveHosts(3) can generate BadAccess and BadValue errors.

The XSetAccessControl(3) function either enables or disables the use of the access control list at each connection setup.

The XEnableAccessControl(3) function enables the use of the access control list at each connection setup.

XEnableAccessControl(3) can generate a BadAccess error.

The XDisableAccessControl(3) function disables the use of the access control list at each connection setup.

XDisableAccessControl(3) can generate a BadAccess error.

STRUCTURES

The XHostAddress structure contains:

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

XAddHost(3) can generate BadAccess and BadValue errors.

XAddHosts(3) can generate BadAccess and BadValue errors.

XRemoveHost(3) can generate BadAccess and BadValue errors.

XSetAccessControl(3) can generate BadAccess and BadValue errors.

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()

Xlib