111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
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/**************************************************************************
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* SIGNAL.C
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*
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* Routines used to clean up on a forced KERNEL termination of a
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* TOOLHELP using app.
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*
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**************************************************************************/
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#include <string.h>
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#include "toolpriv.h"
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/* ----- Global variables ----- */
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WORD wSignalInstalled;
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SIGNAL NEAR *npSignalHead;
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/* SignalRegister
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* Registers a default signal proc to a task. This signal proc is
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* called when the task is about to be terminated and is called before
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* the USER signal proc is called. The registered callback is
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* called HelperSignalProc() [HELPER.ASM] and chains to the USER signal
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* proc (if any) instead of returning.
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*/
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BOOL PASCAL SignalRegister(
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HANDLE hTask)
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{
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SIGNAL *pSig;
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SIGNAL *pTemp;
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/* NULL hTask means current task */
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if (!hTask)
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hTask = GetCurrentTask();
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/* Check to see if this task is already registered */
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for (pSig = npSignalHead ; pSig ; pSig = pSig->pNext)
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if (pSig->hTask == hTask)
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return FALSE;
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/* Allocate a new SIGNAL structure */
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pSig = (SIGNAL *)LocalAlloc(LMEM_FIXED, sizeof (SIGNAL));
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if (!pSig)
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return FALSE;
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/* Fill in the useful fields */
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pSig->hTask = hTask;
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pSig->lpfn = (LPFNCALLBACK)HelperSignalProc;
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pSig->lpfnOld = (LPFNCALLBACK)
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HelperSetSignalProc(hTask, (DWORD)HelperSignalProc);
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/* If this is the only handler, just insert it */
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if (!npSignalHead)
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{
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pSig->pNext = npSignalHead;
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npSignalHead = pSig;
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}
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/* Otherwise, insert at the end of the list */
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else
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{
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for (pTemp = npSignalHead ; pTemp->pNext ; pTemp = pTemp->pNext)
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;
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pSig->pNext = pTemp->pNext;
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pTemp->pNext = pSig;
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}
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return TRUE;
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}
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/* SignalUnRegister
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* Called by an app whose callback is no longer to be used.
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* NULL hTask uses current task.
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*/
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BOOL PASCAL SignalUnRegister(
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HANDLE hTask)
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{
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SIGNAL *pSig;
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SIGNAL *pBefore;
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/* NULL hTask means current task */
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if (!hTask)
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hTask = GetCurrentTask();
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/* First try to find the task */
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pBefore = NULL;
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for (pSig = npSignalHead ; pSig ; pSig = pSig->pNext)
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if (pSig->hTask == hTask)
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break;
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else
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pBefore = pSig;
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if (!pSig)
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return FALSE;
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/* Remove it from the list */
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if (!pBefore)
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npSignalHead = pSig->pNext;
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else
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pBefore->pNext = pSig->pNext;
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/* Replace the old signal proc */
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HelperSetSignalProc(hTask, (DWORD)pSig->lpfnOld);
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/* Free the structure */
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LocalFree((HANDLE)pSig);
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return TRUE;
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}
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