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DKIOCCDREADTOC fails in debugger

I have run into an issue that has me stumped.  The following code runs fine when the standalone application is run from Xcode, but when I run it in the debugger the second ioctl() fails (the DKIOCCDREADTOC):

int fd = -1;


fd = opendev("disk1", O_RDONLY | O_NONBLOCK, 0, NULL);


if(-1 == fd) {
perror("unable to open the drive for reading");
}


dk_cd_read_toc_t cd_read_toc;
uint8_t buffer [2048];


bzero(&cd_read_toc, sizeof(cd_read_toc));
bzero(buffer, sizeof(buffer));


cd_read_toc.format = kCDTOCFormatTOC;
cd_read_toc.formatAsTime = 1;
cd_read_toc.address.track = 0;
cd_read_toc.buffer = buffer;
cd_read_toc.bufferLength = sizeof(buffer);


if(-1 == ioctl(fd, DKIOCCDREADTOC, &cd_read_toc)) {
perror("unable to read TOC");
}


close(fd);

Has anyone experienced issues like this before?

I'm running Xcode 2.3 on a 1.67 GHz PowerBook G4, 10.4.6

Thanks,
Stephen

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