* [timer] fix sys return value to avoid outdated errno
* [rtdef] add wrap to stringify
* [syscall] return value in rt errno should be recycle immediately after call to posix layer
* [syscall] return type of syscall should be long
errno should be recycle immediately after call to rt posix layer to avoid
outdated value
* [format] move prototype to header file
* [fix] futex definition conflict
* Synchronize the code of the rt mart branch to the master branch.
* TTY device
* Add lwP code from rt-smart
* Add vnode in DFS, but DFS will be re-write for rt-smart
* There are three libcpu for rt-smart:
* arm/cortex-a, arm/aarch64
* riscv64
Co-authored-by: Rbb666 <zhangbingru@rt-thread.com>
Co-authored-by: zhkag <zhkag@foxmail.com>
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Bernard Xiong
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