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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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dbmon.c
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1996-04-22
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166 lines
/*++
Copyright (c) 1990 Microsoft Corporation
Module Name:
dbmon.c
Abstract:
A simple program to print strings passed to OutputDebugString when
the app printing the strings is not being debugged.
Author:
Kent Forschmiedt (kentf) 30-Sep-1994
Revision History:
--*/
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
int _cdecl
main(
int argc,
char ** argv
)
/*++
Routine Description:
Arguments:
Return Value:
--*/
{
HANDLE AckEvent;
HANDLE ReadyEvent;
HANDLE SharedFile;
LPVOID SharedMem;
LPSTR String;
DWORD ret;
DWORD LastPid;
LPDWORD pThisPid;
BOOL DidCR;
SECURITY_ATTRIBUTES sa;
SECURITY_DESCRIPTOR sd;
sa.nLength = sizeof(SECURITY_ATTRIBUTES);
sa.bInheritHandle = TRUE;
sa.lpSecurityDescriptor = &sd;
if(!InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION)) {
fprintf(stderr,"unable to InitializeSecurityDescriptor, err == %d\n",
GetLastError());
exit(1);
}
if(!SetSecurityDescriptorDacl(&sd, TRUE, (PACL)NULL, FALSE)) {
fprintf(stderr,"unable to SetSecurityDescriptorDacl, err == %d\n",
GetLastError());
exit(1);
}
AckEvent = CreateEvent(&sa, FALSE, FALSE, "DBWIN_BUFFER_READY");
if (!AckEvent) {
fprintf(stderr,
"dbmon: Unable to create synchronization object, err == %d\n",
GetLastError());
exit(1);
}
if (GetLastError() == ERROR_ALREADY_EXISTS) {
fprintf(stderr, "dbmon: already running\n");
exit(1);
}
ReadyEvent = CreateEvent(&sa, FALSE, FALSE, "DBWIN_DATA_READY");
if (!ReadyEvent) {
fprintf(stderr,
"dbmon: Unable to create synchronization object, err == %d\n",
GetLastError());
exit(1);
}
SharedFile = CreateFileMapping(
(HANDLE)-1,
&sa,
PAGE_READWRITE,
0,
4096,
"DBWIN_BUFFER");
if (!SharedFile) {
fprintf(stderr,
"dbmon: Unable to create file mapping object, err == %d\n",
GetLastError());
exit(1);
}
SharedMem = MapViewOfFile(
SharedFile,
FILE_MAP_READ,
0,
0,
512);
if (!SharedMem) {
fprintf(stderr,
"dbmon: Unable to map shared memory, err == %d\n",
GetLastError());
exit(1);
}
String = (LPSTR)SharedMem + sizeof(DWORD);
pThisPid = SharedMem;
LastPid = 0xffffffff;
DidCR = TRUE;
SetEvent(AckEvent);
for (;;) {
ret = WaitForSingleObject(ReadyEvent, INFINITE);
if (ret != WAIT_OBJECT_0) {
fprintf(stderr, "dbmon: wait failed; err == %d\n", GetLastError());
exit(1);
} else {
if (LastPid != *pThisPid) {
LastPid = *pThisPid;
if (!DidCR) {
putchar('\n');
DidCR = TRUE;
}
}
if (DidCR) {
printf("%3u: ", LastPid);
}
printf("%s", String);
DidCR = (*String && (String[strlen(String) - 1] == '\n'));
SetEvent(AckEvent);
}
}
return 0;
}