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.Dd January 26, 2010
.Dt GSS_DISPLAY_STATUS 3 PRM
.Os
.Sh NAME
.Nm gss_display_status
.Nd Convert a GSS-API status code to text
.\" This next command is for sections 2 and 3 only.
.\" .Sh LIBRARY
.Sh SYNOPSIS
.In "gssapi/gssapi.h"
.Ft OM_uint32
.Fo gss_display_status
.Fa "OM_uint32 *minor_status"
.Fa "OM_uint32 status_value"
.Fa "int status_type"
.Fa "const gss_OID mech_type"
.Fa "OM_uint32 *message_context"
.Fa "gss_buffer_t status_string"
.Fc
.Sh DESCRIPTION
Allows an application to obtain a textual representation of a GSS-API
status code,
for display to the user or for logging purposes.
Since some status values may indicate multiple conditions,
applications may need to call
.Fn gss_display_status
multiple times,
each call generating a single text string.
The
.Fa message_context
parameter is used by
.Fn gss_display_status
to store state information about which error messages have already
been extracted from a given
.Fa status_value ;
.Fa message_context
must be initialized to zero by the application prior to the first call,
and
.Fn gss_display_status
will return a non-zero value in this parameter if there are further
messages to extract.
.Pp
The
.Fa message_context
parameter contains all state information required by
.Fn gss_display_status
in order to extract further messages from the
.Fa status_value ;
even when a non-zero value is returned in this parameter,
the application is not required to call
.Fn gss_display_status
again unless subsequent messages are desired.
The following code extracts all messages from a given status code and prints them to stderr:
.Bd -literal
OM_uint32 message_context;
OM_uint32 status_code;
OM_uint32 maj_status;
OM_uint32 min_status;
gss_buffer_desc status_string;

       ...

message_context = 0;

do {

  maj_status = gss_display_status (
		  &min_status,
		  status_code,
		  GSS_C_GSS_CODE,
		  GSS_C_NO_OID,
		  &message_context,
		  &status_string)

  fprintf(stderr,
	  "%.*s\\n",
	 (int)status_string.length,
	 (char *)status_string.value);

  gss_release_buffer(&min_status, &status_string);

} while (message_context != 0);
.Ed
.Sh PARAMETERS
.Bl -tag
.It minor_status
Mechanism specific status code.
.It status_value
Status value to be converted
.It status_type
.Bl -tag                     
.It GSS_C_GSS_CODE
.Fa status_value
is a GSS status code
.It GSS_C_MECH_CODE
.Fa status_value
is a mechanism status code
.El
.It mech_type
Underlying mechanism (used to interpret a minor status value).
Supply
.Dv GSS_C_NO_OID
to obtain the system default.
.It message_context
Should be initialized to zero by the application prior to the first
call.
On return from
.Fn gss_display_status ,
a non-zero status_value parameter indicates that additional messages
may be extracted from the status code via subsequent calls to
.Fn gss_display_status ,
passing the same
.Fa status_value ,
.Fa status_type ,
.Fa mech_type ,
and
.Fa message_context
parameters.
.It status_string
Textual interpretation of the
.Fa status_value .
Storage associated with this parameter must be freed by the
application after use with a call to
.Fn gss_release_buffer .
.El
.Sh RETURN VALUES
.Bl -tag
.It GSS_S_COMPLETE
Successful completion
.It GSS_S_BAD_MECH
Indicates that translation in accordance with an unsupported mechanism
type was requested
.It GSS_S_BAD_STATUS
The status value was not recognized, or the status type was neither
.Dv GSS_C_GSS_CODE
nor
.Dv GSS_C_MECH_CODE .
.El
.Sh SEE ALSO
.Xr gss_release_buffer 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
.El
.Sh HISTORY
The
.Nm
function first appeared in
.Fx 7.0 .
.Sh AUTHORS
John Wray, Iris Associates
.Sh COPYRIGHT
Copyright (C) The Internet Society (2000).  All Rights Reserved.
.Pp
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
developing Internet standards in which case the procedures for
copyrights defined in the Internet Standards process must be
followed, or as required to translate it into languages other than
English.
.Pp
The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.
.Pp
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.