I'm implementing a simple device driver. The program that uses this driver takes in arguments from the user whether to use demand paging or prefetching(fetches next page only). But when the user requests for prefetching is should send this information to the driver. The problem is vm_fault has a standard structure as follows:
int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
So how to incorporate this additional information of prefetching into these, so that I can use it to write a different routine for prefetching?
Or is there any other way to achieve this?
[EDIT]
To give a clearer picture:
This how a program takes input.
./user_prog [filename] --prefetch
The user_prog sets some flags in it, now how to send these flags information to dev.c(the driver file), as all the arguments to functions are fixed like above fault(). I hope this gives more clarification.
You can use the flags in mmap() to pass your custom flags too.
void *mmap(void *addr, size_t length, int prot, int flags,
int fd, off_t offset);
Make sure your custom flag values uses bits different from the flag values used by mmap(). From the manpage, the macros are defined in sys/mman.h. Find the exact values(may vary across systems) with echo '#include <sys/mman.h>' | gcc -E - -dM | grep MAP_*. My system has this:
#define MAP_32BIT 0x40
#define MAP_TYPE 0x0f
#define MAP_EXECUTABLE 0x01000
#define MAP_FAILED ((void *) -1)
#define MAP_PRIVATE 0x02
#define MAP_ANON MAP_ANONYMOUS
#define MAP_LOCKED 0x02000
#define MAP_STACK 0x20000
#define MAP_NORESERVE 0x04000
#define MAP_HUGE_SHIFT 26
#define MAP_POPULATE 0x08000
#define MAP_DENYWRITE 0x00800
#define MAP_FILE 0
#define MAP_SHARED 0x01
#define MAP_GROWSDOWN 0x00100
#define MAP_HUGE_MASK 0x3f
#define MAP_HUGETLB 0x40000
#define MAP_FIXED 0x10
#define MAP_ANONYMOUS 0x20
#define MAP_NONBLOCK 0x10000
Some non-clashing flags would be 0x200 and 0x400.
Anyone got a clue how to make a vbscript popup-message/box "spawn" on top of everything and not in the background...?
This is my script: :)
Set objShell = WScript.CreateObject("WScript.Shell")
Const wshYes = 6
Const wshNo = 7
Const wshYesNoDialog = 4
Const wshQuestionMark = 32
intReturn = objShell.Popup("Vil du annulere shutdown?", _
20, "Shutdown om 5 minutter!", wshYesNoDialog + wshQuestionMark)
If intReturn = wshYes Then
Wscript.Echo "Shutdown annuleret."
objShell.Run "C:\ProgramData\AutoShutdown\Annuler.bat"
End If
I am very bad at vbscript, I am just using this little part for my Batch program. Any help appreciated!
It was simply by adding vbSystemModal
120, "Shutdown om 5 minutter!", wshYesNoDialog + vbSystemModal + wshQuestionMark)
The are wrappers around the API messagebox function. Just pass the numbers. Most msgbox functions just pass the numbers on so they don't need to understand them.
So use &h1000, &h2000, or &h40000
/*
* MessageBox() Flags
*/
#define MB_OK 0x00000000L
#define MB_OKCANCEL 0x00000001L
#define MB_ABORTRETRYIGNORE 0x00000002L
#define MB_YESNOCANCEL 0x00000003L
#define MB_YESNO 0x00000004L
#define MB_RETRYCANCEL 0x00000005L
#if(WINVER >= 0x0500)
#define MB_CANCELTRYCONTINUE 0x00000006L
#endif /* WINVER >= 0x0500 */
#define MB_ICONHAND 0x00000010L
#define MB_ICONQUESTION 0x00000020L
#define MB_ICONEXCLAMATION 0x00000030L
#define MB_ICONASTERISK 0x00000040L
#if(WINVER >= 0x0400)
#define MB_USERICON 0x00000080L
#define MB_ICONWARNING MB_ICONEXCLAMATION
#define MB_ICONERROR MB_ICONHAND
#endif /* WINVER >= 0x0400 */
#define MB_ICONINFORMATION MB_ICONASTERISK
#define MB_ICONSTOP MB_ICONHAND
#define MB_DEFBUTTON1 0x00000000L
#define MB_DEFBUTTON2 0x00000100L
#define MB_DEFBUTTON3 0x00000200L
#if(WINVER >= 0x0400)
#define MB_DEFBUTTON4 0x00000300L
#endif /* WINVER >= 0x0400 */
#define MB_APPLMODAL 0x00000000L
#define MB_SYSTEMMODAL 0x00001000L
#define MB_TASKMODAL 0x00002000L
#if(WINVER >= 0x0400)
#define MB_HELP 0x00004000L // Help Button
#endif /* WINVER >= 0x0400 */
#define MB_NOFOCUS 0x00008000L
#define MB_SETFOREGROUND 0x00010000L
#define MB_DEFAULT_DESKTOP_ONLY 0x00020000L
#if(WINVER >= 0x0400)
#define MB_TOPMOST 0x00040000L
#define MB_RIGHT 0x00080000L
#define MB_RTLREADING 0x00100000L
#endif /* WINVER >= 0x0400 */
#ifdef _WIN32_WINNT
#if (_WIN32_WINNT >= 0x0400)
#define MB_SERVICE_NOTIFICATION 0x00200000L
#else
#define MB_SERVICE_NOTIFICATION 0x00040000L
#endif
#define MB_SERVICE_NOTIFICATION_NT3X 0x00040000L
#endif
#define MB_TYPEMASK 0x0000000FL
#define MB_ICONMASK 0x000000F0L
#define MB_DEFMASK 0x00000F00L
#define MB_MODEMASK 0x00003000L
#define MB_MISCMASK 0x0000C000L
Adding + 4096 to your code will also work
20, "Shutdown om 5 minutter!", wshYesNoDialog + wshQuestionMark + 4096)
Here's google search link for objShell.Popup modal 4096
In my c++ class, I want use WIN API GetFileSizeEx() function. When I compile my code, the compilator said:
"error: 'GetFileSizeEx' was not declared in this scope".
However, others functions like CreateFile() or WriteFile() work perfectly.
In my class header, I declare this :
#if defined(WINVER) && WINVER==0x0602 /* windows 8 */
#define WINVER 0x0602
#define _WIN32_WINNT 0x0602
#elif defined(WINVER) && WINVER==0x0601 /* windows 7 */
#define WINVER 0x0601
#define _WIN32_WINNT 0x0601
#elif defined(WINVER) && WINVER==0x0600 /* windows vista and server 2008 */
#define WINVER 0x0600
#define _WIN32_WINNT 0x0600
#elif defined(WINVER) && WINVER==0x0502 /* server 2003 */
#define WINVER 0x0502
#define _WIN32_WINNT 0x0502
#elif defined(WINVER) && WINVER==0x0501 /* windows xp */
#define WINVER 0x0501
#define _WIN32_WINNT 0x0501
#endif
#include <windows.h>
#include <winbase.h>
#include <string>
In my .cpp class:
Test::Test()
{
hFile = CreateFile(TEXT("conf/configure_tool.txt"),
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL);
if (hFile == INVALID_HANDLE_VALUE)
{
canAcces = false;
}else
{
if(GetFileSizeEx(hFile,&sized) != 0)
{
canAcces = true;
}
}
}
Have you an idea to resolve my problem ?
From the documentation:
Minimum supported client Windows XP [desktop apps only]
So you need to ensure that you have defined WINVER to be 0x0501 or greater.
If that doesn't solve the problem then the likely cause is that you are using a deficient SDK. Perhaps from an old version of a non-MS compiler. Make sure that you have an up-to-date SDK.
It must be said that the conditional code in the question that attempts to define _WIN32_WINNT is a little odd. Why don't you define _WIN32_WINNT at the same time as you define WINVER?
I find the following post very useful to do a project of my own. Here's the newbie question then: what must I include for this to work?
Link:
How to accurately measure mouse movement in inches or centimetres for a mouse with a known DPI
Content:
The following code registers the RAWINPUTDEVICE so it can be used in WM_INPUT.
RAWINPUTDEVICE Rid[1];
Rid[0].usUsagePage = HID_USAGE_PAGE_GENERIC;
Rid[0].usUsage = HID_USAGE_GENERIC_MOUSE;
Rid[0].dwFlags = RIDEV_INPUTSINK;
Rid[0].hwndTarget = hWnd;
RegisterRawInputDevices(Rid, 1, sizeof(Rid[0]);
The following code acutally uses the Rid variable two determine how many pixels the mouse has moved since the last time WM_INPUT was initiated.
case WM_INPUT:
{
UINT dwSize = 40;
static BYTE lpb[40];
GetRawInputData((HRAWINPUT)lParam, RID_INPUT,
lpb, &dwSize, sizeof(RAWINPUTHEADER));
RAWINPUT* raw = (RAWINPUT*)lpb;
if (raw->header.dwType == RIM_TYPEMOUSE)
{
int xPosRelative = raw->data.mouse.lLastX; // Could be 1, or could be more than 1
int yPosRelative = raw->data.mouse.lLastY; // Could be 1, or could be more than 1!
}
break;
}
I just found it.
#include "hidusage.h"
here's some definitions it has
#define HID_USAGE_GENERIC_POINTER ((USAGE) 0x01)
#define HID_USAGE_GENERIC_MOUSE ((USAGE) 0x02)
#define HID_USAGE_GENERIC_JOYSTICK ((USAGE) 0x04)
#define HID_USAGE_GENERIC_GAMEPAD ((USAGE) 0x05)
#define HID_USAGE_GENERIC_KEYBOARD ((USAGE) 0x06)
#define HID_USAGE_GENERIC_KEYPAD ((USAGE) 0x07)
#define HID_USAGE_GENERIC_SYSTEM_CTL ((USAGE) 0x80)
typedef USHORT USAGE,*PUSAGE;
You need to include windows.h
...also the HID_USAGE_PAGE_GENERIC and HID_USAGE_GENERIC_MOUSE must be defined.
See MSDN..
#ifndef HID_USAGE_PAGE_GENERIC
#define HID_USAGE_PAGE_GENERIC ((USHORT) 0x01)
#endif
#ifndef HID_USAGE_GENERIC_MOUSE
#define HID_USAGE_GENERIC_MOUSE ((USHORT) 0x02)
#endif
http://msdn.microsoft.com/en-gb/library/windows/desktop/ee418864%28v=vs.85%29.aspx
I'm developing an application that makes calls to ffprobe that return the unorthodox exit status of -1094995529 for certain files when on Windows. This exit status is given consistently, and there is some minor discussion of this.
Why is this value given, and where is it documented? Can I expect this status to be different on a unix machine where the allowed exit statuses are more constrained?
Error codes from ffmpeg (error.h from avutil) :
http://ffmpeg.org/doxygen/trunk/error_8h_source.html
It turns out the value you specified is :
#define AVERROR_INVALIDDATA FFERRTAG( 'I','N','D','A')
The -1094995529 becomes -0x41444E49 and when you look at those letters, in ACSII, 0x41 = 'A', 0x44 = 'D', 0x4E = 'N, and 0x49 = 'I'. Due to the macro/etc things are reversed, so ADNI becomes INDA, which you can see from the #define snippet, is the AVERROR_INVALIDDATA defined FFERRTAG( 'I','N','D','A').
The rest of the error codes are in that file and I've pasted them below here :
#define AVERROR_BSF_NOT_FOUND FFERRTAG(0xF8,'B','S','F') ///< Bitstream filter not found
#define AVERROR_BUG FFERRTAG( 'B','U','G','!') ///< Internal bug, also see AVERROR_BUG2
#define AVERROR_BUFFER_TOO_SMALL FFERRTAG( 'B','U','F','S') ///< Buffer too small
#define AVERROR_DECODER_NOT_FOUND FFERRTAG(0xF8,'D','E','C') ///< Decoder not found
#define AVERROR_DEMUXER_NOT_FOUND FFERRTAG(0xF8,'D','E','M') ///< Demuxer not found
#define AVERROR_ENCODER_NOT_FOUND FFERRTAG(0xF8,'E','N','C') ///< Encoder not found
#define AVERROR_EOF FFERRTAG( 'E','O','F',' ') ///< End of file
#define AVERROR_EXIT FFERRTAG( 'E','X','I','T') ///< Immediate exit was requested; the called function should not be restarted
#define AVERROR_EXTERNAL FFERRTAG( 'E','X','T',' ') ///< Generic error in an external library
#define AVERROR_FILTER_NOT_FOUND FFERRTAG(0xF8,'F','I','L') ///< Filter not found
#define AVERROR_INVALIDDATA FFERRTAG( 'I','N','D','A') ///< Invalid data found when processing input
#define AVERROR_MUXER_NOT_FOUND FFERRTAG(0xF8,'M','U','X') ///< Muxer not found
#define AVERROR_OPTION_NOT_FOUND FFERRTAG(0xF8,'O','P','T') ///< Option not found
#define AVERROR_PATCHWELCOME FFERRTAG( 'P','A','W','E') ///< Not yet implemented in FFmpeg, patches welcome
#define AVERROR_PROTOCOL_NOT_FOUND FFERRTAG(0xF8,'P','R','O') ///< Protocol not found
#define AVERROR_STREAM_NOT_FOUND FFERRTAG(0xF8,'S','T','R') ///< Stream not found
#define AVERROR_BUG2 FFERRTAG( 'B','U','G',' ')
#define AVERROR_UNKNOWN FFERRTAG( 'U','N','K','N') ///< Unknown error, typically from an external library
#define AVERROR_EXPERIMENTAL (-0x2bb2afa8) ///< Requested feature is flagged experimental. Set strict_std_compliance if you really want to use it.
#define AVERROR_INPUT_CHANGED (-0x636e6701) ///< Input changed between calls. Reconfiguration is required. (can be OR-ed with AVERROR_OUTPUT_CHANGED)
#define AVERROR_OUTPUT_CHANGED (-0x636e6702) ///< Output changed between calls. Reconfiguration is required. (can be OR-ed with AVERROR_INPUT_CHANGED)
#define AVERROR_HTTP_BAD_REQUEST FFERRTAG(0xF8,'4','0','0')
#define AVERROR_HTTP_UNAUTHORIZED FFERRTAG(0xF8,'4','0','1')
#define AVERROR_HTTP_FORBIDDEN FFERRTAG(0xF8,'4','0','3')
#define AVERROR_HTTP_NOT_FOUND FFERRTAG(0xF8,'4','0','4')
#define AVERROR_HTTP_OTHER_4XX FFERRTAG(0xF8,'4','X','X')
#define AVERROR_HTTP_SERVER_ERROR FFERRTAG(0xF8,'5','X','X')