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Xau(3X) Xau(3X) NAME Xau, XauFileName, XauReadAuth, XauLockAuth, XauUnlockAuth, XauWriteAuth, 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() Xauth *XauReadAuth (auth_file) FILE *auth_file; int XauWriteAuth (auth_file, auth) FILE *auth_file; Xauth *auth; Xauth *XauGetAuthByAddr (family, address_length, address, num- ber_length, number) unsigned short family; unsigned short address_length; char *address; unsigned short number_length; char *number; Xauth *XauGetBestAuthByAddr (family, address_length, address, num- ber_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; 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 sta- tically 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 (for example, 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 autho- rization 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 asso- ciated -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 val- ues depending on the results: A system error occurred, either a file_name which is too long, or an unexpected failure from a system call. errno may prove useful. gretries attempts failed. 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(1X), xdm(1X) AUTHOR Keith Packard, MIT X Consortium Xau(3X)