rtos

https://github.com/RT-Thread/rt-thread/blob/master/include/rtservice.h

/**
 * rt_container_of - return the member address of ptr, if the type of ptr is the
 * struct type.
 */
#define rt_container_of(ptr, type, member) \
    ((type *)((char *)(ptr) - (unsigned long)(&((type *)0)->member)))

按照英文，应该是说如果 ptr 的类型是 struct 类型，返回ptr的成员（member）的地址

但实际上，ptr 应该是某个 struct （type）的一个

Is your enhancement proposal related to a problem? Please describe.
access_addr always seems to be of size 4; that should be #defined.
crc_init always seem to be of size 3; that should be #defined.

https://github.com/zephyrproject-rtos/zephyr/pull/31009/files#r736229677
https://github.com/zephyrproject-rtos/zephyr/pull/31009/files#r736229386

Describe the solution you'd like
A

Motivation

In #1459, we would like to have the socket handled by fd_write and fd_read. That's why we need to implement the WASI-IO proposal.

Details

The WASI-IO proposal is a phase 2 proposal, so the spec of this proposal may change. Please follow the latest master to finish the implementation.

Appendix

• WASI-IO: https://github.com/WebAssembly/wasi-io
• WASI-IO relate

In PROTECTED mode, the MPU is used to map regions of memory to supervisor- and/or user-accessible memory. Currently, that algorithm is very simple: The entire address range is made accessible in supervisor mode; a single MPU region is used to enable user-mode access in each user memory region.

Each MPU region must bit both of a power-of-two size and with an alignment in memory equal to the si

With aligned_alloc() in the C11 standard, free() is called to free memory, rather than an equivalent aligned_free().

We should update our library with some logic that can be used to correctly call aligned_free() if free() is used instead.