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.ds xT X Toolkit Intrinsics \- C Language Interface

.ds xW Athena X Widgets \- C Language X Toolkit Interface

.ds xL Xlib \- C Language X Interface

.ds xC Inter-Client Communication Conventions Manual

.na

.de Ds

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.de hN

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..

.ny0

.TH XAddHost __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"

.SH NAME

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

.SH SYNTAX

.HP

int XAddHost\^(\^Display *\fIdisplay\fP, XHostAddress *\fIhost\fP\^); 

.HP

int XAddHosts\^(\^Display *\fIdisplay\fP, XHostAddress *\fIhosts\fP, 

int \fInum_hosts\fP\^);

.HP

XHostAddress *XListHosts\^(\^Display *\fIdisplay\fP, int *\fInhosts_return\fP,

Bool \fIstate_return\fP\^);

.HP

int XRemoveHost\^(\^Display *\fIdisplay\fP, XHostAddress *\fIhost\fP\^);

.HP

int XRemoveHosts\^(\^Display *\fIdisplay\fP, XHostAddress *\fIhosts\fP, int \fInum_hosts\fP\^);

.HP

int XSetAccessControl\^(\^Display *\fIdisplay\fP, int \fImode\fP\^);

.HP

int XEnableAccessControl\^(\^Display *\fIdisplay\fP\^);

.HP

int XDisableAccessControl\^(\^Display *\fIdisplay\fP\^);

.SH ARGUMENTS

.IP \fIdisplay\fP 1i

Specifies the connection to the X server.

.ds Ho added or removed

.IP \fIhost\fP 1i

Specifies the host that is to be \*(Ho.

.ds Ho added or removed

.IP \fIhosts\fP 1i

Specifies each host that is to be \*(Ho.

.IP \fImode\fP 1i

Specifies the mode.

You can pass

.ZN EnableAccess

or

.ZN DisableAccess .

.IP \fInhosts_return\fP 1i

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

.IP \fInum_hosts\fP 1i

Specifies the number of hosts.

.IP \fIstate_return\fP 1i

Returns the state of the access control.

.SH DESCRIPTION

The

.ZN 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

.ZN BadAccess

error results.

.LP

.ZN XAddHost

can generate

.ZN BadAccess

and

.ZN BadValue

errors.

.LP

The

.ZN 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

.ZN BadAccess

error results.

.LP

.ZN XAddHosts

can generate

.ZN BadAccess

and

.ZN BadValue

errors.

.LP

The

.ZN XListHosts

function returns the current access control list as well as whether the use 

of the list at connection setup was enabled or disabled.

.ZN 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 memory should be freed by calling

.ZN XFree .

.LP

The

.ZN 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

.ZN 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.

.LP

.ZN XRemoveHost

can generate

.ZN BadAccess

and

.ZN BadValue

errors.

.LP

The

.ZN 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

.ZN 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.

.LP

.ZN XRemoveHosts

can generate

.ZN BadAccess

and

.ZN BadValue

errors.

.LP

The

.ZN XSetAccessControl

function either enables or disables the use of the access control list 

at each connection setup.

.LP

.ZN XSetAccessControl

can generate

.ZN BadAccess

and

.ZN BadValue 

errors.

.LP

The

.ZN XEnableAccessControl

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

.LP

.ZN XEnableAccessControl

can generate a

.ZN BadAccess 

error.

.LP

The

.ZN XDisableAccessControl

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

.LP

.ZN XDisableAccessControl

can generate a

.ZN BadAccess 

error.

.SH STRUCTURES

The

.ZN XHostAddress

structure contains:

.LP

.Ds 0

typedef struct {

        int family;     /\&* for example FamilyInternet */

        int length;     /\&* length of address, in bytes */

        char *address;  /\&* pointer to where to find the address */

} XHostAddress;

.De

.LP

The family member specifies which protocol address family to use 

(for example, TCP/IP or DECnet) and can be

.ZN FamilyInternet ,

.ZN FamilyInternet6 ,

.ZN FamilyServerInterpreted ,

.ZN FamilyDECnet ,

or

.ZN FamilyChaos .

The length member specifies the length of the address in bytes.

The address member specifies a pointer to the address.

.LP

For the ServerInterpreted family, the length is ignored and the address 

member is a pointer to a 

.ZN XServerInterpretedAddress

structure which contains:

.LP

.Ds 0

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;

.De

.LP

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.

.SH DIAGNOSTICS

.TP 1i

.ZN BadAccess

A client attempted

to modify the access control list from other than the local

(or otherwise authorized) host.

.TP 1i

.ZN 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.

.SH "SEE ALSO"

XFree(__libmansuffix__)

.br

\fI\*(xL\fP