On Sun, Sep 26, 2010 at 1:00 PM, Venkatram Tummala <[email protected]>wrote:
> > Try writing a user space file handling program in C. I repeat what other > have already said before. Before starting kernel development, you need to > know the user space basics. > I have done what you are saying in user space not once many times. Since you have been able to debug my code so I am mentioning I have made programs to insert ,delete a node in a link list ,reverse a link list,stack que implementations via link list,binary search trees, algorithms mentioned in the graphs chapter of Coreman book I have programmed, I have made socket programs which can read and write data to a socket stream (very basic network programming done) used seek,lseek methods in user space. > The first read comes in with a *f_pos of 0. If you dont update the file > pointer, the user space program will keep reading from f_pos 0 indefinitely. > As file pointer is at offset 0 always because you dont update *f_pos, every > read(..) called by user space will succeed. So, your command cat /dev/bond > will never return. user space programs generally look for a specific return > code to know that it is the end of the file. > Thanks a lot for this one I was not clear on this part.
