Yukihiro "Matz" Matsumoto f267925d45 mruby-socket: translate Winsock errors to errno on Windows ...

Winsock APIs (socket, bind, connect, accept, recv, send, ...) report
errors via WSAGetLastError() and do not set errno, so mrb_sys_fail
on Windows was reading a stale or zero errno. Result: every socket
failure raised SystemCallError with errno 0 ("Success") instead of
the appropriate Errno::* class.

Add mrb_hal_socket_set_errno_from_last_error() to the HAL:
- POSIX: no-op (failed calls already set errno)
- Windows: maps WSAGetLastError() to a POSIX errno via wsa_to_errno()
  with 32 cases covering the common Winsock error codes; unmapped
  codes fall back to EIO. Each case is #ifdef-guarded against older
  MSVC CRTs that lack a particular Exxx.

In src/socket.c, route the 22 socket-API failure sites through a new
sock_sys_fail() helper that calls the HAL translator before
mrb_sys_fail. Also fix mrb_hal_socket_set_nonblock() on Windows,
which was returning -1 without setting errno after ioctlsocket
failure.

POSIX behavior unchanged (verified: TCPSocket connect refused ->
Errno::ECONNREFUSED, bind to privileged port -> Errno::EACCES, bad
sockopt -> Errno::EOPNOTSUPP).

Closes #6819, reported by Asmod4n.

Co-authored-by: Claude <noreply@anthropic.com>

2026-05-07 11:01:46 +09:00

..

socket_hal.h

mruby-socket: translate Winsock errors to errno on Windows

2026-05-07 11:01:46 +09:00