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+.\" $Xorg: Xau.man,v 1.3 2000/08/17 19:41:54 cpqbld Exp $
+.\" $XdotOrg$
+.\"
+.\" Copyright (c) 1994 X Consortium
+.\"
+.\" Permission is hereby granted, free of charge, to any person obtaining a
+.\" copy of this software and associated documentation files (the "Software"),
+.\" to deal in the Software without restriction, including without limitation
+.\" the rights to use, copy, modify, merge, publish, distribute, sublicense,
+.\" and/or sell copies of the Software, and to permit persons to whom the
+.\" Software furnished to do so, subject to the following conditions:
+.\"
+.\" The above copyright notice and this permission notice shall be included in
+.\" all copies or substantial portions of the Software.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+.\" THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+.\" WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+.\" OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+.\" SOFTWARE.
+.\"
+.\" Except as contained in this notice, the name of the X Consortium shall not
+.\" be used in advertising or otherwise to promote the sale, use or other
+.\" dealing in this Software without prior written authorization from the
+.\" X Consortium.
+.\"
+.\" $XFree86: xc/doc/man/Xau/Xau.man,v 1.2 2001/01/27 18:20:19 dawes Exp $
+.\"
+.TH Xau 3 __xorgversion__
+.SH NAME
+Xau library: XauFileName, XauReadAuth, XauLockAuth, XauUnlockAuth,
+XauWriteAuth, XauDisposeAuth,
+XauGetAuthByAddr, XauGetBestAuthByAddr \- X authority database routines
+.SH SYNOPSIS
+.B "#include <X11/Xauth.h>"
+.PP
+.nf
+.ta .5i 2i
+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;
+
+.HP
+char *XauFileName (void);
+.HP
+Xauth *XauReadAuth (FILE *\fIauth_file\fP\^);
+.HP
+int XauWriteAuth (FILE *\fIauth_file\fP, Xauth *\fIauth\fP\^);
+.HP
+Xauth *XauGetAuthByAddr (unsigned short \fIfamily\fP\^, unsigned short
+\fIaddress_length\fP\^, char *\fIaddress\fP\^, unsigned short
+\fInumber_length\fP\^, char *\fInumber\fP\^);
+.HP
+Xauth *XauGetBestAuthByAddr (unsigned short \fIfamily\fP\^, unsigned short
+\fIaddress_length\fP\^, char *\fIaddress\fP\^, unsigned short
+\fInumber_length\fP\^, char *\fInumber\fP\^, int \fItypes_length\fP\^, char
+**\fItypes\fR\^, int *\fItype_lengths\fR\^);
+.HP
+int XauLockAuth (char *\fIfile_name\fP\^, int \fIretries\fP\^, int
+\fItimeout\fP\^, long \fIdead\fP\^);
+.HP
+int XauUnlockAuth (char *\fIfile_name\fP\^);
+.HP
+int XauDisposeAuth (Xauth *\fIauth\fP\^);
+.ft R
+.SH DESCRIPTION
+.PP
+\fBXauFileName\fP 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.
+.PP
+\fBXauReadAuth\fP reads the next entry from \fIauth_file\fP. The entry is
+\fBnot\fP statically allocated and should be freed by calling
+\fIXauDisposeAuth\fP.
+.PP
+\fBXauWriteAuth\fP writes an authorization entry to \fIauth_file\fP. It
+returns 1 on success, 0 on failure.
+.PP
+\fBXauGetAuthByAddr\fP searches for an entry which matches the given network
+address/display number pair. The entry is \fBnot\fP statically allocated
+and should be freed by calling \fIXauDisposeAuth\fP.
+.PP
+\fBXauGetBestAuthByAddr\fP is similar to \fBXauGetAuthByAddr\fP, 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 \fItypes\fP argument is an array of
+strings, one string for each authentication method. \fItypes_length\fP
+specifies how many elements are in the \fItypes\fP array.
+\fItypes_lengths\fP is an array of integers representing the length
+of each string.
+.PP
+\fBXauLockAuth\fP does the work necessary to synchronously update an
+authorization file. First it makes two file names, one with ``-c'' appended
+to \fIfile_name\fP, the other with ``-l'' appended. If the ``-c'' file
+already exists and is more than \fIdead\fP seconds old, \fIXauLockAuth\fP
+removes it and the associated ``-l'' file. To prevent possible
+synchronization troubles with NFS, a \fIdead\fP value of zero forces the
+files to be removed. \fIXauLockAuth\fP makes \fIretries\fP attempts to
+create and link the file names, pausing \fItimeout\fP seconds between each
+attempt. \fIXauLockAuth\fP returns a collection of values depending on the
+results:
+.nf
+.ta .5i 2i
+
+ 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 \fIretries\fP attempts failed
+
+ LOCK_SUCCESS The lock succeeded.
+
+.fi
+.PP
+\fBXauUnlockAuth\fP undoes the work of \fIXauLockAuth\fP by unlinking both
+the ``-c'' and ``-l'' file names.
+.PP
+\fBXauDisposeAuth\fP frees storage allocated to hold an authorization entry.
+.SH "SEE ALSO"
+xauth(1), xdm(1)
+.SH AUTHOR
+Keith Packard, MIT X Consortium