Hello,
I am using the following like to open /dev/sda (I am
guessing this is called a raw device).
fd = open ("/dev/sda", O_RDWR | O_SYNC | O_DIRECT);
I have a few questions regarding the above:
1. Can I use O_DIRECT while opening the device? Will
it have any effect. Or do I need to go through a file
system (which has O_DIRECT implemented) for it work.
2. Which "open" is called. Can someone give me a
pointer to the source file where this is implemented.
I am guessing this "open" is like a generic one, as
opposed to the ones implemented in ext2, ext3,
jfs...etc directories.
3. I am getting an error when I try to issue a lseek
on the opened device:
lseek (fd, 200, SEEK_SET);
I am getting "Invalid Argument", am I not allowed to
use SEEK_SET, if so why?
4. Again, any pointer to the source file where this
"lseek" is implemented.
Thanks a lot,
Ahmed.
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