This routine is provided to support the sharing of work between
multiple processes. It will typically be used by the context acceptor,
in an application where a single process receives incoming connection
requests and accepts security contexts over them, then passes the
established context to one or more other processes for message exchange.
The gss_export_sec_context routine deactivates
the security context for the calling process and creates an interprocess
token which, when passed to gss_import_sec_context in
another process, will re-activate the context in the second process.
Only a single instantiation of a given context may be active at
any one time; a subsequent attempt by a context exporter to access
the exported security context will fail.
The implementation may constrain the set of processes by which
the interprocess token may be imported, either as a function of
local security policy, or as a result of implementation decisions.
For example, some implementations may constrain contexts to be
passed only between processes that run under the same account, or
which are part of the same process group.
The interprocess token may contain security-sensitive information
(for example, cryptographic keys).
If the creation of the interprocess token is successful, all
process-wide resources associated with the security context will
be deallocated, and the context_handle will
be set to GSS_C_NO_CONTEXT.