wasip3: Get {g,s}etsockopt working (#725)

Move the implementation for WASIp2 to a shared location and then use
`#define`s/`typedef`s to get the shared structure compiling since the
functionality supported by WASIp2/WASIp3 is effectively the same.

Author: alexcrichton

expected/wasm32-wasip2/defined-symbols.txt

@@ -1,4 +1,3 @@
-NS_PER_S
 _CLOCK_MONOTONIC
 _CLOCK_REALTIME
 _Exit
@@ -343,6 +342,8 @@ __wasilibc_rmdirat
 __wasilibc_sockaddr_to_wasi
 __wasilibc_sockaddr_validate
 __wasilibc_stat
+__wasilibc_tcp_getsockopt
+__wasilibc_tcp_setsockopt
 __wasilibc_tell
 __wasilibc_unlinkat
 __wasilibc_unspecified_addr
@@ -1384,7 +1385,6 @@ tcp_result_u32_error_code_free
 tcp_result_u64_error_code_free
 tcp_result_u8_error_code_free
 tcp_result_void_error_code_free
-tcp_setsockopt
 tcp_tcp_socket_drop_own
 tdelete
 tdestroy

expected/wasm32-wasip3/defined-symbols.txt

@@ -339,6 +339,8 @@ __wasilibc_rmdirat
 __wasilibc_sockaddr_to_wasi
 __wasilibc_sockaddr_validate
 __wasilibc_stat
+__wasilibc_tcp_getsockopt
+__wasilibc_tcp_setsockopt
 __wasilibc_tell
 __wasilibc_unlinkat
 __wasilibc_unspecified_addr

libc-bottom-half/CMakeLists.txt

@@ -145,6 +145,7 @@ else()
     sources/socket.c
     sources/sockets_utils.c
     sources/sockopt.c
+    sources/tcp_sockopt.c
   )
 endif()
 

libc-bottom-half/headers/private/wasi/tcp.h

@@ -6,6 +6,86 @@
 #ifndef __wasip1__
 
 #include <wasi/sockets_utils.h>
+#include <sys/socket.h>
+
+// Normalize names on WASIp2 to the WASIp3-based names
+#ifdef __wasip2__
+typedef network_error_code_t sockets_error_code_t;
+typedef tcp_own_tcp_socket_t sockets_own_tcp_socket_t;
+typedef tcp_borrow_tcp_socket_t sockets_borrow_tcp_socket_t;
+typedef network_ip_address_family_t sockets_ip_address_family_t;
+#define sockets_borrow_tcp_socket tcp_borrow_tcp_socket
+#endif // __wasip2__
+
+typedef struct {
+  int dummy;
+} tcp_socket_state_unbound_t;
+typedef struct {
+  int dummy;
+} tcp_socket_state_bound_t;
+typedef struct {
+  int dummy;
+} tcp_socket_state_connecting_t;
+typedef struct {
+  int dummy;
+} tcp_socket_state_listening_t;
+
+// Pollables here are lazily initialized on-demand.
+typedef struct {
+#ifdef __wasip2__
+  streams_own_input_stream_t input;
+  poll_own_pollable_t input_pollable;
+  streams_own_output_stream_t output;
+  poll_own_pollable_t output_pollable;
+#else
+  int dummy; // TODO(wasip3)
+#endif
+} tcp_socket_state_connected_t;
+
+typedef struct {
+  sockets_error_code_t error_code;
+} tcp_socket_state_connect_failed_t;
+
+// This is a tagged union. When adding/removing/renaming cases, be sure to keep
+// the tag and union definitions in sync.
+typedef struct {
+  enum {
+    TCP_SOCKET_STATE_UNBOUND,
+    TCP_SOCKET_STATE_BOUND,
+    TCP_SOCKET_STATE_CONNECTING,
+    TCP_SOCKET_STATE_CONNECTED,
+    TCP_SOCKET_STATE_CONNECT_FAILED,
+    TCP_SOCKET_STATE_LISTENING,
+  } tag;
+  union {
+    tcp_socket_state_unbound_t unbound;
+    tcp_socket_state_bound_t bound;
+    tcp_socket_state_connecting_t connecting;
+    tcp_socket_state_connected_t connected;
+    tcp_socket_state_connect_failed_t connect_failed;
+    tcp_socket_state_listening_t listening;
+  };
+} tcp_socket_state_t;
+
+typedef struct {
+  sockets_own_tcp_socket_t socket;
+  tcp_socket_state_t state;
+#ifdef __wasip2__
+  // This pollable is lazily initialized on-demand.
+  poll_own_pollable_t socket_pollable;
+#endif
+  bool blocking;
+  bool fake_nodelay;
+  bool fake_reuseaddr;
+  sockets_ip_address_family_t family;
+  monotonic_clock_duration_t send_timeout;
+  monotonic_clock_duration_t recv_timeout;
+} tcp_socket_t;
+
+int __wasilibc_tcp_getsockopt(void *data, int level, int optname,
+                              void *restrict optval, socklen_t *restrict optlen);
+int __wasilibc_tcp_setsockopt(void *data, int level, int optname,
+                              const void *optval, socklen_t optlen);
 
 /// Adds the provided TCP socket to the descriptor table, returning the
 /// corresponding file descriptor.