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Xau(3)											   Xau(3)

NAME
       Xau  library:  XauFileName, XauReadAuth, XauLockAuth, XauUnlockAuth, XauWriteAuth, XauDis-
       poseAuth, XauGetAuthByAddr, XauGetBestAuthByAddr - X authority database routines

SYNOPSIS
       #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 (void);

       Xauth *XauReadAuth (FILE *auth_file);

       int XauWriteAuth (FILE *auth_file, Xauth *auth);

       Xauth *XauGetAuthByAddr (unsigned short family, unsigned short
	      address_length, const char *address, unsigned short
	      number_length, const char *number, unsigned short
	      name_length, const char *name);

       Xauth *XauGetBestAuthByAddr (unsigned short family, unsigned short
	      address_length, const char *address, unsigned short
	      number_length, const char *number, int types_length,
	      char **types, const int *type_lengths);

       int XauLockAuth (const char *file_name, int retries, int
	      timeout, long dead);

       int XauUnlockAuth (const char *file_name);

       int XauDisposeAuth (Xauth *auth);

DESCRIPTION
       XauFileName 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.

       XauWriteAuth  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 XauDis-
       poseAuth.

       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, XauLock-
       Auth removes it and the associated ``-l'' file.	To prevent possible synchronization trou-
       bles  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.

SEE ALSO
       xauth(1), xdm(1)

AUTHOR
       Keith Packard, MIT X Consortium

X Version 11				   libXau 1.0.8 				   Xau(3)
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