Re: [OSX] ReadPipe error UserSpace

• Subject: Re: [OSX] ReadPipe error UserSpace
• From: Manu <email@hidden>
• Date: Sun, 24 Mar 2002 09:51:28 +0100

I try read a pipe with the ReadPipeTO function but i've an error
e0004051. I don't understand where is the problem.

I'm pretty sure this is a time out error, its the sort of thing you'd
expect to happen using ReadPipeTO, as the TO bit means use a timeout.
What timeout values are you using?

To decode error messages, have a look in error.h, or
<http://developer.apple.com/techpubs/macosx/Darwin/IOKit/DeviceInterfaces/AccessingHardware/AH_Overview/Error_Return_Values.html>.

It turns out 0xe0004xxx is a USB error code. In USB.h you'll find a
USB error 0x51 is a time out.

#define kIOUSBTransactionTimeout iokit_usb_err(81) // 0x51  time out

With the ReadPipe function if i delete the
"numBytesread=sizeof(gBuffer);" line i've an e00002c8 return error.

That looks like a general IOKit error.

#define kIOReturnVMError iokit_common_err(0x2c8) // misc. VM failure

I don't know what your code change is doing, but maybe you're
poassing  uninitialised data as the size to read, this would
generally cause all sorts of memory errors.

Thanks ben

You'll find below the part of the source code concerned by the errors.
In fact, i serves me as this model to set up a driver for a USB modem.

Thank for your help

Manu

unsigned char		gBuffer[64];
UInt32			numBytesRead;
.
.
.

err = (*intf)->WritePipeTO(intf,1,kTestMessage,strlen(kTestMessage),1000,1000);

if(kIOReturnNoDevice == err)
{
	printf("erreur IOService :%08x\n",err);
	closeInterfaceInterface (intf);
	return 1;
}

if(kIOReturnNotOpen == err)
{
	printf("Interface Non Ouverte :%08x\n",err);
	closeInterfaceInterface (intf);
	return 1;
}

if(kIOReturnSuccess != err)
{
	printf("Echec par IOReturnSuccess :%08x\n",err);
	closeInterfaceInterface (intf);
	return 1;
}

printf("Ecriture de %s (%ld Bytes) \n",kTestMessage,strlen(kTestMessage));

numBytesRead = sizeof(gBuffer);

err = (*intf)->ReadPipeTO(intf,2,gBuffer, &numBytesRead,1000,1000);

if(kIOReturnNoDevice == err)
{
	printf("erreur IOService :%08x",err);
	closeInterfaceInterface (intf);
	return 1;
}

if(kIOReturnNotOpen == err)
{
	printf("Interface Non Ouverte :%08x",err);
	closeInterfaceInterface (intf);
	return 1;
}

if(kIOReturnSuccess != err)
{
	printf("Echec par IOReturnSuccess :%08x",err);
	closeInterfaceInterface (intf);
	return 1;
}

printf("Lu %ld bytes", numBytesRead);
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