164 lines
3.4 KiB
C
164 lines
3.4 KiB
C
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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dbmon.c
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Abstract:
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A simple program to print strings passed to OutputDebugString when
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the app printing the strings is not being debugged.
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Author:
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Kent Forschmiedt (kentf) 30-Sep-1994
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Revision History:
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--*/
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#include <windows.h>
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#include <stdio.h>
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#include <stdlib.h>
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int _cdecl
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main(
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int,
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char **
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)
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/*++
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Routine Description:
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Arguments:
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Return Value:
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--*/
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{
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HANDLE AckEvent;
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HANDLE ReadyEvent;
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HANDLE SharedFile;
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LPVOID SharedMem;
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LPSTR String;
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DWORD ret;
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DWORD LastPid;
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LPDWORD pThisPid;
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BOOL DidCR;
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SECURITY_ATTRIBUTES sa;
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SECURITY_DESCRIPTOR sd;
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sa.nLength = sizeof(SECURITY_ATTRIBUTES);
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sa.bInheritHandle = TRUE;
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sa.lpSecurityDescriptor = &sd;
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if(!InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION)) {
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fprintf(stderr,"unable to InitializeSecurityDescriptor, err == %d\n",
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GetLastError());
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exit(1);
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}
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if(!SetSecurityDescriptorDacl(&sd, TRUE, (PACL)NULL, FALSE)) {
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fprintf(stderr,"unable to SetSecurityDescriptorDacl, err == %d\n",
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GetLastError());
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exit(1);
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}
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AckEvent = CreateEvent(&sa, FALSE, FALSE, "DBWIN_BUFFER_READY");
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if (!AckEvent) {
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fprintf(stderr,
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"dbmon: Unable to create synchronization object, err == %d\n",
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GetLastError());
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exit(1);
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}
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if (GetLastError() == ERROR_ALREADY_EXISTS) {
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fprintf(stderr, "dbmon: already running\n");
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exit(1);
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}
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ReadyEvent = CreateEvent(&sa, FALSE, FALSE, "DBWIN_DATA_READY");
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if (!ReadyEvent) {
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fprintf(stderr,
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"dbmon: Unable to create synchronization object, err == %d\n",
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GetLastError());
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exit(1);
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}
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SharedFile = CreateFileMapping(
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(HANDLE)-1,
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&sa,
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PAGE_READWRITE,
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0,
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4096,
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"DBWIN_BUFFER");
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if (!SharedFile) {
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fprintf(stderr,
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"dbmon: Unable to create file mapping object, err == %d\n",
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GetLastError());
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exit(1);
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}
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SharedMem = MapViewOfFile(
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SharedFile,
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FILE_MAP_READ,
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0,
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0,
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512);
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if (!SharedMem) {
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fprintf(stderr,
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"dbmon: Unable to map shared memory, err == %d\n",
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GetLastError());
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exit(1);
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}
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String = (LPSTR)SharedMem + sizeof(DWORD);
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pThisPid = (LPDWORD)SharedMem;
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LastPid = 0xffffffff;
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DidCR = TRUE;
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SetEvent(AckEvent);
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for (;;) {
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ret = WaitForSingleObject(ReadyEvent, INFINITE);
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if (ret != WAIT_OBJECT_0) {
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fprintf(stderr, "dbmon: wait failed; err == %d\n", GetLastError());
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exit(1);
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} else {
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if (LastPid != *pThisPid) {
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LastPid = *pThisPid;
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if (!DidCR) {
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putchar('\n');
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DidCR = TRUE;
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}
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}
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if (DidCR) {
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printf("%3u: ", LastPid);
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}
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printf("%s", String);
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DidCR = (*String && (String[strlen(String) - 1] == '\n'));
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SetEvent(AckEvent);
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}
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}
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}
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