* [timer] fix sys return value to avoid outdated errno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outdated value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
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