NAME

XauFileName, XauReadAuth, XauLockAuth, XauUnlockAuth, XauWriteAuth, XauGetAuthByAddr - 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 ()
Xauth *XauReadAuth (auth_file)
	FILE *auth_file;
int XauWriteAuth (auth_file, auth)
	FILE *auth_file;
	Xauth *auth;
Xauth *XauGetAuthByAddr (family,
address_length, address,
number_length, number)
	unsigned short family;
	unsigned short address_length;
	char *address;
	unsigned short number_length;
	char *number;
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;

DESCRIPTION

XauFileName generates the default authorization file name by first checking the XAUTHROTIY 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

XauLockAuth does the work necessary to synchronously update an authorization file. First it makes to 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.

SEE ALSO

xauth(1), xdm(1)

COPYRIGHT

Copyright 1988, Massachusetts Institute of Technology.
See X(1) for a full statement of rights and permissions.

AUTHOR

Keith Packard, MIT X Consortium