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doc/socket_api.md: some historical notes (#4494)

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@ -87,3 +87,38 @@ $ iwasm --addr-pool=1.2.3.4/15,2.3.4.6/16 socket_example.wasm
``` ```
Refer to [socket api sample](../samples/socket-api) for the compilation of the Wasm applications and [_iwasm_ for Intel SGX](../product-mini/platforms/linux-sgx) for the Wasm runtime. Refer to [socket api sample](../samples/socket-api) for the compilation of the Wasm applications and [_iwasm_ for Intel SGX](../product-mini/platforms/linux-sgx) for the Wasm runtime.
## The background and compatibility notes
### WASIp1
The WASIp1 provides a subset of the socket API.
Namely,
* send()
* recv()
* shutdown()
* accept()
Functionalities like connect() and listen() are intentionally omitted
there to maintain the capability-based security model, inherited from
cloudabi. The common practice for applications is to make the host code
pass already connected/listening sockets to wasm module.
### WAMR extensions
WAMR extends the WASIp1 with the rest of socket API functionalities
for convenience.
* socket()
* connect()
* bind()
* listen()
* some of getsockopt/setsockopt options
* name resolution (a subset of getaddrinfo)
### Compatibilities
Many of runtimes (eg. Wasmer and WasmEdge) provide similar extensions.
Unfortunately, they are all incompatible. Thus, portable applications
should not rely on these extensions.