76 lines
1.3 KiB
C
76 lines
1.3 KiB
C
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/*++
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Copyright (c) 1996 Microsoft Corporation
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Module Name:
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poll.c
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Abstract:
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This module contains code to poll for debugger breakin.
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Author:
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David N. Cutler (davec) 27-Nov-96
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Revision History:
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--*/
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#include "bd.h"
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LOGICAL
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BdPollBreakIn(
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VOID
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)
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/*++
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Routine Description:
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This function checks to determine if a breakin packet is pending.
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If a packet is present.
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A packet is present if:
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There is a valid character which matches BREAK_CHAR.
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Return Value:
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A function value of TRUE is returned if a breakin packet is present.
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Otherwise, a value of FALSE is returned.
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--*/
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{
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LOGICAL BreakIn;
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UCHAR Input;
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ULONG Status;
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//
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// If the debugger is enabled, check if a breakin by the kernel
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// debugger is pending.
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//
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BreakIn = FALSE;
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if (BdDebuggerEnabled != FALSE) {
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if (BdControlCPending != FALSE) {
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BdControlCPressed = TRUE;
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BreakIn = TRUE;
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BdControlCPending = FALSE;
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} else {
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Status = BlPortPollByte(BdFileId, &Input);
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if ((Status == CP_GET_SUCCESS) &&
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(Input == BREAKIN_PACKET_BYTE)) {
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BreakIn = TRUE;
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BdControlCPressed = TRUE;
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}
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}
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}
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return BreakIn;
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}
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