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FreeBSD 11.0 - man page for gss_delete_sec_context (freebsd section 3)

GSS_DELETE_SEC_CONTEXT(3)					Programmer's Manual					 GSS_DELETE_SEC_CONTEXT(3)

gss_delete_sec_context -- Discard a security context
#include <gssapi/gssapi.h> OM_uint32 gss_delete_sec_context(OM_uint32 *minor_status, gss_ctx_id_t *context_handle, gss_buffer_t output_token);
Delete a security context. 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 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 context_handle. In addition to deleting established security contexts, gss_delete_sec_context() must also be able to delete "half-built" security contexts resulting from an incomplete sequence of gss_init_sec_context() / gss_accept_sec_context() calls. The output_token parameter is retained for compatibility with version 1 of the GSS-API. It is recommended that both peer applications invoke gss_delete_sec_context() passing the value GSS_C_NO_BUFFER for the output_token parameter, indicating that no token is required, and that gss_delete_sec_context() should simply delete local context data structures. If the application does pass a valid buffer to 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.
minor_status Mechanism specific status code. context_handle Context handle identifying context to delete. After deleting the context, the GSS-API will set this context handle to GSS_C_NO_CONTEXT. output_token Token to be sent to remote application to instruct it to also delete the context. It is recommended that applications spec- ify GSS_C_NO_BUFFER for this parameter, requesting local deletion only. If a buffer parameter is provided by the applica- tion, 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.
GSS_S_COMPLETE Successful completion GSS_S_NO_CONTEXT No valid context was supplied
gss_accept_sec_context(3), gss_init_sec_context(3), gss_process_context_token(3)
RFC 2743 Generic Security Service Application Program Interface Version 2, Update 1 RFC 2744 Generic Security Service API Version 2 : C-bindings
The gss_delete_sec_context function first appeared in FreeBSD 7.0.
John Wray, Iris Associates
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January 26, 2010 BSD