109 lines
3.6 KiB
C
109 lines
3.6 KiB
C
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/****************************************************************
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* *
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* Copyright 2001 Sanchez Computer Associates, Inc. *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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/* --------------------------------------------
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* Async. events that can be deferred
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* --------------------------------------------
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*/
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enum deferred_event
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{
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no_event = 0,
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outofband_event,
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network_error_event,
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zstp_or_zbrk_event,
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tt_write_error_event,
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DEFERRED_EVENTS
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};
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/* =============================================================================
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* EXPORTED VARIABLES
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* =============================================================================
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*/
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/* -------------------------------------------------------
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* - Used by the substitute xfer_table functions.
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* - Keeping_count => should change name to num_logged.
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* - Should be made static and wrapped with a function for weaker
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* intermodule coupling; however, it's accessed from assembly
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* language => not worth the trouble to add a layer.
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* -------------------------------------------------------
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*/
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#if defined(UNIX)
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GBLREF volatile int4 num_deferred;
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#elif defined(VMS)
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GBLREF volatile short num_deferred;
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#else
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# error "Unsupported Platform"
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#endif
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/* ------------------------------------------------------------------
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* Sets up transfer table changes needed for:
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* - Synchronous handling of asynchronous events.
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* - Single-stepping and breakpoints
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* Return value indicates success (e.g. if first to attempt).
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*
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* Notes:
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* - mdb_condition_handler is different.
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* Should change it to use this function (CAREFULLY!).
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* - So are routines related to zbreak and zstep.
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* ==> Need to update them too (also carefully -- needs
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* a thorough redesign or rethinking).
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* ------------------------------------------------------------------
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*/
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boolean_t xfer_set_handlers(int4, void (*callback)(int4), int4 param);
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/* ------------------------------------------------------------------
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* Reset transfer table to normal settings.
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*
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* Puts back everything that could/would have been changed, assuming
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* that no xfer_table changes have been added since it was written.
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*
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* Return value indicates success/failure. Succeeds only if event
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* type of reset is the same as event type of set.
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* ------------------------------------------------------------------
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*/
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boolean_t xfer_reset_handlers(int4 event_type);
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/* ------------------------------------------------------------------
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* This version resets the handlers only if they were set by the
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* same event type.
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* ------------------------------------------------------------------
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*/
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boolean_t xfer_reset_if_setter(int4 event_type);
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/* -------------------------------------------------------
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* Prototypes for transfer table callback functions.
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* Only called by routine that manages xfer_table.
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*
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* Should use these (with enums?) to ensure type checking
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* is done.
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* -------------------------------------------------------
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*/
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void ctrap_set(int4);
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void ctrlc_set(int4);
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void ctrly_set(int4);
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void tp_timeout_defer(int4);
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void tt_write_error_set(int4);
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/* ------------------------------------------------------------------
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* Perform action corresponding to the first async event that
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* was logged.
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* ------------------------------------------------------------------
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*/
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void async_action(bool);
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boolean_t xfer_table_changed(void);
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