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DKIOCCDREADTOC ioctl() fails during debugging

Subject: DKIOCCDREADTOC ioctl() fails during debugging
From: "Stephen F. Booth" <email@hidden>
Date: Wed, 31 May 2006 07:48:07 -0700
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Delivered-to: email@hidden

I have run into a rather strange problem I can't get my head around.

I have a program that works correctly when run from Xcode or Finder, but if I try to debug it a certain section of code fails every time. I am simply opening a CD using opendev() than calling ioctl() to read the disc's TOC:

_fd = opendev((char *)[[self deviceName] fileSystemRepresentation], O_RDONLY | O_NONBLOCK, 0, NULL);

if(-1 == ioctl([self fileDescriptor], DKIOCCDREADTOC, &cd_read_toc)) {

I've omitted the error handling code, but I do checking. opendev() works every time, but as I mentioned, ioctl() fails from the debugger. Any ideas why?

Stephen

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