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+.\" -*- nroff -*-
+.\"
+.\" Copyright (c) 2005 Doug Rabson
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	$FreeBSD$
+.\"
+.\" Copyright (C) The Internet Society (2000).  All Rights Reserved.
+.\"
+.\" This document and translations of it may be copied and furnished to
+.\" others, and derivative works that comment on or otherwise explain it
+.\" or assist in its implementation may be prepared, copied, published
+.\" and distributed, in whole or in part, without restriction of any
+.\" kind, provided that the above copyright notice and this paragraph are
+.\" included on all such copies and derivative works.  However, this
+.\" document itself may not be modified in any way, such as by removing
+.\" the copyright notice or references to the Internet Society or other
+.\" Internet organizations, except as needed for the purpose of
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+.\" copyrights defined in the Internet Standards process must be
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+.\"
+.\" The limited permissions granted above are perpetual and will not be
+.\" revoked by the Internet Society or its successors or assigns.
+.\"
+.\" This document and the information contained herein is provided on an
+.\" "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
+.\" TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
+.\" BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
+.\" HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+.\"
+.\" The following commands are required for all man pages.
+.Dd November 12, 2005
+.Os
+.Dt GSS_DELETE_SEC_CONTEXT 3 PRM
+.Sh NAME
+.Nm gss_delete_sec_context
+.Nd Discard a security context
+.\" This next command is for sections 2 and 3 only.
+.\" .Sh LIBRARY
+.Sh SYNOPSIS
+.In "gssapi/gssapi.h"
+.Ft OM_uint32
+.Fo gss_delete_sec_context
+.Fa "OM_uint32 *minor_status"
+.Fa "gss_ctx_id_t *context_handle"
+.Fa "gss_buffer_t output_token"
+.Fc
+.Sh DESCRIPTION
+Delete a security context.
+.Fn gss_delete_sec_context
+will delete the local data structures associated with the specified
+security context,
+and may generate an output_token,
+which when passed to the peer
+.Fn gss_process_context_token
+will instruct it to do likewise.
+If no token is required by the mechanism,
+the GSS-API should set the length field of the output_token (if
+provided) to zero.
+No further security services may be obtained using the context
+specified by
+.Fa context_handle .
+.Pp
+In addition to deleting established security contexts,
+.Fn gss_delete_sec_context
+must also be able to delete "half-built" security contexts resulting
+from an incomplete sequence of
+.Fn gss_init_sec_context
+/
+.Fn gss_accept_sec_context
+calls.
+.Pp
+The
+.Fa output_token
+parameter is retained for compatibility with version 1 of the GSS-API.
+It is recommended that both peer applications invoke
+.Fn gss_delete_sec_context
+passing the value
+.Dv GSS_C_NO_BUFFER
+for the
+.Fa output_token
+parameter,
+indicating that no token is required,
+and that
+.Fn gss_delete_sec_context
+should simply delete local context data structures.
+If the application does pass a valid buffer to
+.Fn gss_delete_sec_context ,
+mechanisms are encouraged to return a zero-length token,
+indicating that no peer action is necessary,
+and that no token should be transferred by the application.
+.Sh PARAMETERS
+.Bl -tag
+.It minor_status
+Mechanism specific status code.
+.It context_handle
+Context handle identifying context to delete.
+After deleting the context,
+the GSS-API will set this context handle to
+.Dv GSS_C_NO_CONTEXT .
+.It output_token
+Token to be sent to remote application to instruct it to also delete
+the context.
+It is recommended that applications specify
+.Dv GSS_C_NO_BUFFER
+for this parameter,
+requesting local deletion only.
+If a buffer parameter is provided by the application,
+the mechanism may return a token in it;
+mechanisms that implement only local deletion should set the length
+field of this token to zero to indicate to the application that no
+token is to be sent to the peer.
+.El
+.Sh RETURN VALUES
+.Bl -tag
+.It GSS_S_COMPLETE
+Successful completion
+.It GSS_S_NO_CONTEXT
+No valid context was supplied
+.El
+.Sh SEE ALSO
+.Xr gss_process_context_token 3 ,
+.Xr gss_init_sec_context 3 ,
+.Xr gss_accept_sec_context 3
+.Sh STANDARDS
+.Bl -tag
+.It RFC 2743
+Generic Security Service Application Program Interface Version 2, Update 1
+.It RFC 2744
+Generic Security Service API Version 2 : C-bindings
+.\" .Sh HISTORY
+.El
+.Sh HISTORY
+The
+.Nm
+manual page example first appeared in
+.Fx 7.0 .
+.Sh AUTHORS
+John Wray, Iris Associates