# Labs of xv6-riscv-fall19

## Notes
### fork()
On duplicating the process, opened files are also duplicated.
### exec()
The system call exec replaces the calling process’s memory ==but preserves
its file table==.
### mknod()
Files created with this syscall has no contents. Furthermore, write() and read() are being diverted to the kernel device implementation instead of passing them to the file system.

## Reference
- [xv6-riscv-fall19](https://github.com/mit-pdos/xv6-riscv-fall19)

- [fork() - fd related](https://stackoverflow.com/questions/30226530/same-file-descriptor-after-fork)

- [The RISC-V Reader: An Open Architecture Atlas (chinese edition)] (http://riscvbook.com/chinese)