view console stdout of a windows service

/*++
 
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;
}
                                              

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