KernelLibIoControl函数学习

在微软自带的16650驱动中出现了如下函数。

if (!KernelLibIoControl(m_hIsrHandler, IOCTL_ISR16550_INFO, pIsrAddress, dwBlockSize, NULL, 0, NULL)) {
                DEBUGMSG(ZONE_ERROR,(TEXT("SL_InstallSoftwareISR: KernelLibIoControl call failed./r/n")));
                KernelLibIoControl(m_hIsrHandler, IOCTL_ISR16550_UNLOAD, (LPVOID)&m_pIsrInfoVirt, sizeof(ISR16550_INFO), NULL, 0, NULL);
                return FALSE;
            }

现在来看看PB帮助吧。

This function is called from a driver to communicate with an interrupt handler.

BOOL KernelLibIoControl(
HANDLE hModule,
DWORD dwIoControlCode,
LPVOID lpInBuf,
DWORD nInBufSize,
LPVOID lpOutBuf,
DWORD nOutBufSize,
LPDWORD lpBytesReturned
);

Parameters

hModule

[in] Handle returned from the LoadIntChainHandler function.

dwIoControlCode

[in] OEM or ISV specified IOCTL.

lpInBuf

[in] Long pointer to a buffer that contains the data required to perform the operation. This parameter can be NULL if the dwIoControlCode parameter specifies an operation that does not require input data.

nInBufSize

[in] Size, in bytes, of the buffer pointed to by lpInBuffer.

lpOutBuf

[out] Long pointer to a buffer that receives the operation&＃39;s output data. This parameter can be NULL if the dwIoControlCode parameter specifies an operation that does not produce output data.

nOutBufSize

[in] Size, in bytes, of the buffer pointed to by lpOutBuffer.

lpBytesReturned

[out] Long pointer to a variable that receives the size, in bytes, of the data stored in the buffer pointed to by lpOutBuffer. The lpBytesReturned parameter cannot be NULL.

Return Values

If the function succeeds, then TRUE is returned; otherwise, FALSE is returned.

To get extended error information, call the GetLastError function.

Remarks

KernelLibIoControl calls the IOControl function that is implemented in the ISR handler.