1XAddHost(3)                     XLIB FUNCTIONS                     XAddHost(3)
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NAME

6       XAddHost, XAddHosts, XListHosts, XRemoveHost, XRemoveHosts, XSetAccess‐
7       Control, XEnableAccessControl, XDisableAccessControl, XHostAddress,
8       XServerInterpretedAddress - control host access and host control struc‐
9       ture
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SYNTAX

12       int XAddHost(Display *display, XHostAddress *host);
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14       int XAddHosts(Display *display, XHostAddress *hosts, int num_hosts);
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16       XHostAddress *XListHosts(Display *display, int *nhosts_return, Bool
17              state_return);
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19       int XRemoveHost(Display *display, XHostAddress *host);
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21       int XRemoveHosts(Display *display, XHostAddress *hosts, int num_hosts);
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23       int XSetAccessControl(Display *display, int mode);
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25       int XEnableAccessControl(Display *display);
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27       int XDisableAccessControl(Display *display);
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ARGUMENTS

30       display   Specifies the connection to the X server.
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32       host      Specifies the host that is to be added or removed.
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34       hosts     Specifies each host that is to be added or removed.
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36       mode      Specifies the mode.  You can pass EnableAccess or DisableAc‐
37                 cess.
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39       nhosts_return
40                 Returns the number of hosts currently in the access control
41                 list.
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43       num_hosts Specifies the number of hosts.
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45       state_return
46                 Returns the state of the access control.
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DESCRIPTION

49       The XAddHost function adds the specified host to the access control
50       list for that display.  The server must be on the same host as the
51       client issuing the command, or a BadAccess error results.
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53       XAddHost can generate BadAccess and BadValue errors.
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55       The XAddHosts function adds each specified host to the access control
56       list for that display.  The server must be on the same host as the
57       client issuing the command, or a BadAccess error results.
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59       XAddHosts can generate BadAccess and BadValue errors.
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61       The XListHosts function returns the current access control list as well
62       as whether the use of the list at connection setup was enabled or dis‐
63       abled.  XListHosts allows a program to find out what machines can make
64       connections.  It also returns a pointer to a list of host structures
65       that were allocated by the function.  When no longer needed, this mem‐
66       ory should be freed by calling XFree.
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68       The XRemoveHost function removes the specified host from the access
69       control list for that display.  The server must be on the same host as
70       the client process, or a BadAccess error results.  If you remove your
71       machine from the access list, you can no longer connect to that server,
72       and this operation cannot be reversed unless you reset the server.
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74       XRemoveHost can generate BadAccess and BadValue errors.
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76       The XRemoveHosts function removes each specified host from the access
77       control list for that display.  The X server must be on the same host
78       as the client process, or a BadAccess error results.  If you remove
79       your machine from the access list, you can no longer connect to that
80       server, and this operation cannot be reversed unless you reset the
81       server.
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83       XRemoveHosts can generate BadAccess and BadValue errors.
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85       The XSetAccessControl function either enables or disables the use of
86       the access control list at each connection setup.
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88       XSetAccessControl can generate BadAccess and BadValue errors.
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90       The XEnableAccessControl function enables the use of the access control
91       list at each connection setup.
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93       XEnableAccessControl can generate a BadAccess error.
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95       The XDisableAccessControl function disables the use of the access con‐
96       trol list at each connection setup.
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98       XDisableAccessControl can generate a BadAccess error.
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STRUCTURES

101       The XHostAddress structure contains:
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103       typedef struct {
104               int family;     /* for example FamilyInternet */
105               int length;     /* length of address, in bytes */
106               char *address;  /* pointer to where to find the address */
107       } XHostAddress;
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109       The family member specifies which protocol address family to use (for
110       example, TCP/IP or DECnet) and can be FamilyInternet, FamilyInternet6,
111       FamilyServerInterpreted, FamilyDECnet, or FamilyChaos.  The length mem‐
112       ber specifies the length of the address in bytes.  The address member
113       specifies a pointer to the address.
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115       For the ServerInterpreted family, the length is ignored and the address
116       member is a pointer to a XServerInterpretedAddress structure which con‐
117       tains:
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119       typedef struct {
120               int typelength;         /* length of type string, in bytes */
121               int valuelength;        /* length of value string, in bytes */
122               char *type;             /* pointer to where to find the type string */
123               char *value;            /* pointer to where to find the address */
124       } XServerInterpretedAddress;
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126       The type and value members point to strings representing the type and
127       value of the server interpreted entry.  These strings may not be NULL-
128       terminated so care should be used when accessing them.  The typelength
129       and valuelength members specify the length in byte of the type and
130       value strings.
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DIAGNOSTICS

133       BadAccess A client attempted to modify the access control list from
134                 other than the local (or otherwise authorized) host.
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136       BadValue  Some numeric value falls outside the range of values accepted
137                 by the request.  Unless a specific range is specified for an
138                 argument, the full range defined by the argument's type is
139                 accepted.  Any argument defined as a set of alternatives can
140                 generate this error.
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SEE ALSO

143       XFree(3)
144       Xlib - C Language X Interface
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148X Version 11                     libX11 1.6.7                      XAddHost(3)
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