Missing POSIX networking headers (sys/socket.h, netinet/in.h, netdb.h)

[rg-net]

Priority: HIGH

Missing Headers

• sys/socket.h - Socket creation, bind, listen, accept, connect, send, recv
• sys/select.h - select(), fd_set, FD_* macros
• netinet/in.h - sockaddr_in, INADDR_*, htons/ntohs
• arpa/inet.h - inet_pton, inet_ntop, inet_addr
• netdb.h - getaddrinfo, gethostbyname, getservbyname

Impact

Blocks any network programming - servers, clients, HTTP, DNS resolution. Critical gap for WASI compatibility since WASI has socket support.

Considerations

• WASM/browser won't have these but WASI needs them
• Windows requires different approach (Winsock2)
• Can provide compile-time fencing with JACL_HAS_SOCKETS
• Consider lightweight stubs for WASM that return ENOSYS

References

• POSIX.1-2017 Base Definitions
• WASI sockets proposal: https://github.com/WebAssembly/wasi-sockets