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Xau(3) manual page
Table of Contents
Xau library: XauFileName, XauReadAuth, XauLockAuth,
XauUnlockAuth, XauWriteAuth, XauDisposeAuth, XauGetAuthByAddr, XauGetBestAuthByAddr
- X authority database routines
#include <X11/Xauth.h>
typedef struct xauth {
unsigned short family;
unsigned short address_length;
char *address;
unsigned short number_length;
char *number;
unsigned short name_length;
char *name;
unsigned short data_length;
char *data;
} Xauth;
char *XauFileName ()
Xauth *XauReadAuth (auth_file)
FILE *auth_file;
int XauWriteAuth (auth_file, auth)
FILE *auth_file;
Xauth *auth;
Xauth *XauGetAuthByAddr (kAfamily,
address_length, address,
number_length, number)
unsigned short family;
unsigned short address_length;
char *address;
unsigned short number_length;
char *number;
Xauth *XauGetBestAuthByAddr (kAfamily,
address_length, address,
number_length, number,
types_length, types, type_lengths)
unsigned short family;
unsigned short address_length;
char *address;
unsigned short number_length;
char *number;
int types_length;
char **types;
int *type_lengths;
int XauLockAuth (file_name, retries, timeout, dead)
char *file_name;
int retries;
int timeout;
long dead;
int XauUnlockAuth (file_name)
char *file_name;
XauDisposeAuth (auth)
Xauth *auth;
DescriptionXauFileName generates the default authorization file name by
first checking the XAUTHORITY environment variable if set, else it returns
$HOME/.Xauthority. This name is statically allocated and should not be freed.
XauReadAuth reads the next entry from auth_file. The entry is not statically
allocated and should be freed by calling XauDisposeAuth.
XuWriteAuth writes
an authorization entry to auth_file. It returns 1 on success, 0 on failure.
XauGetAuthByAddr searches for an entry which matches the given network
address/display number pair. The entry is not statically allocated and
should be freed by calling XauDisposeAuth.
XauGetBestAuthByAddr is similar
to XauGetAuthByAddr, except that a list of acceptable authentication methods
is specified. Xau will choose the file entry which matches the earliest
entry in this list (e.g., the most secure authentication method). The types
argument is an array of strings, one string for each authentication method.
types_length specifies how many elements are in the types array. types_lengths
is an array of integers representing the length of each string.
XauLockAuth
does the work necessary to synchronously update an authorization file.
First it makes two file names, one with ``-c'' appended to file_name, the other
with ``-l'' appended. If the ``-c'' file already exists and is more than dead seconds
old, XauLockAuth removes it and the associated ``-l'' file. To prevent possible
synchronization troubles with NFS, a dead value of zero forces the files
to be removed. XauLockAuth makes retries attempts to create and link the
file names, pausing timeout seconds between each attempt. XauLockAuth returns
a collection of values depending on the results:
LOCK_ERROR A system error occurred, either a file_name
which is too long, or an unexpected failure from
a system call. errno may prove useful.
LOCK_TIMEOUT retries attempts failed
LOCK_SUCCESS The lock succeeded.
XauUnlockAuth undoes the work of XauLockAuth by unlinking both the ``-c'' and
``-l'' file names.
XauDisposeAuth frees storage allocated to hold an authorization
entry.
xauth(1)
, xdm(1)
Keith Packard, MIT X Consortium
Table of Contents
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