1 files changed, 61 insertions, 0 deletions
diff --git a/shared/net_compat.h b/shared/net_compat.h
new file mode 100644
index 0000000..5e63e04
--- /dev/null
+++ b/shared/net_compat.h
@@ -0,0 +1,61 @@
+// net_compat.h
+#pragma once
+
+#ifdef _WIN32
+  #include <winsock2.h>
+  #include <ws2tcpip.h>
+  #pragma comment(lib, "ws2_32.lib")
+
+  // Map POSIX names to Winsock equivalents
+  #define close(s)        closesocket(s)
+  #define MSG_DONTWAIT 0 // no direct equivalent, use non-blocking mode instead
+
+  static inline int net_errno(void) { return WSAGetLastError(); }
+  #define NET_EAGAIN  WSAEWOULDBLOCK
+  #define NET_EINTR   WSAEINTR
+
+  typedef int socklen_t;
+
+  // err.h doesn't exist on Windows — provide a minimal shim
+  #include <stdio.h>
+  #include <stdlib.h>
+  static inline void err(int code, const char *msg) {
+    fprintf(stderr, "%s: WSA error %d\n", msg, WSAGetLastError());
+    exit(code);
+  }
+
+  // Winsock requires explicit init/cleanup
+  static inline void net_init(void) {
+    WSADATA wsa;
+    if (WSAStartup(MAKEWORD(2,2), &wsa) != 0) {
+      fprintf(stderr, "WSAStartup failed\n");
+      exit(EXIT_FAILURE);
+    }
+  }
+  static inline void net_cleanup(void) { WSACleanup(); }
+
+  // Non-blocking: Winsock uses ioctlsocket instead of MSG_DONTWAIT
+  #include <winsock2.h>
+  static inline void set_nonblocking(SOCKET s) {
+    u_long mode = 1;
+    ioctlsocket(s, FIONBIO, &mode);
+  }
+
+#else
+  #include <sys/socket.h>
+  #include <netinet/in.h>
+  #include <unistd.h>
+  #include <err.h>
+  #include <errno.h>
+  #include <fcntl.h>
+
+  static inline void net_init(void) {}    // no-op on POSIX
+  static inline void net_cleanup(void) {} // no-op on POSIX
+  static inline void set_nonblocking(int s) {
+    fcntl(s, F_SETFL, fcntl(s, F_GETFL) | O_NONBLOCK);
+  }
+
+  static inline int net_errno(void) { return errno; }
+  #define NET_EAGAIN  EAGAIN
+  #define NET_EINTR   EINTR
+#endif