[lldb][NFC] Move few static helpers to the class Socket (#106640)

Fixed a typo in Socket::SetOption().

lldb/include/lldb/Host/Socket.h

@@ -112,8 +112,17 @@ class Socket : public IOObject {
   static llvm::Expected<std::unique_ptr<UDPSocket>>
   UdpConnect(llvm::StringRef host_and_port, bool child_processes_inherit);
 
-  int GetOption(int level, int option_name, int &option_value);
-  int SetOption(int level, int option_name, int option_value);
+  static int GetOption(NativeSocket sockfd, int level, int option_name,
+                       int &option_value);
+  int GetOption(int level, int option_name, int &option_value) {
+    return GetOption(m_socket, level, option_name, option_value);
+  };
+
+  static int SetOption(NativeSocket sockfd, int level, int option_name,
+                       int option_value);
+  int SetOption(int level, int option_name, int option_value) {
+    return SetOption(m_socket, level, option_name, option_value);
+  };
 
   NativeSocket GetNativeSocket() const { return m_socket; }
   SocketProtocol GetSocketProtocol() const { return m_protocol; }
@@ -138,6 +147,8 @@ class Socket : public IOObject {
 
   virtual size_t Send(const void *buf, const size_t num_bytes);
 
+  static int CloseSocket(NativeSocket sockfd);
+  static Status GetLastError();
   static void SetLastError(Status &error);
   static NativeSocket CreateSocket(const int domain, const int type,
                                    const int protocol,

lldb/source/Host/common/Socket.cpp

@@ -386,11 +386,7 @@ Status Socket::Close() {
   LLDB_LOGF(log, "%p Socket::Close (fd = %" PRIu64 ")",
             static_cast<void *>(this), static_cast<uint64_t>(m_socket));
 
-#if defined(_WIN32)
-  bool success = closesocket(m_socket) == 0;
-#else
-  bool success = ::close(m_socket) == 0;
-#endif
+  bool success = CloseSocket(m_socket) == 0;
   // A reference to a FD was passed in, set it to an invalid value
   m_socket = kInvalidSocketValue;
   if (!success) {
@@ -400,18 +396,20 @@ Status Socket::Close() {
   return error;
 }
 
-int Socket::GetOption(int level, int option_name, int &option_value) {
+int Socket::GetOption(NativeSocket sockfd, int level, int option_name,
+                      int &option_value) {
   get_socket_option_arg_type option_value_p =
       reinterpret_cast<get_socket_option_arg_type>(&option_value);
   socklen_t option_value_size = sizeof(int);
-  return ::getsockopt(m_socket, level, option_name, option_value_p,
+  return ::getsockopt(sockfd, level, option_name, option_value_p,
                       &option_value_size);
 }
 
-int Socket::SetOption(int level, int option_name, int option_value) {
+int Socket::SetOption(NativeSocket sockfd, int level, int option_name,
+                      int option_value) {
   set_socket_option_arg_type option_value_p =
-      reinterpret_cast<get_socket_option_arg_type>(&option_value);
-  return ::setsockopt(m_socket, level, option_name, option_value_p,
+      reinterpret_cast<set_socket_option_arg_type>(&option_value);
+  return ::setsockopt(sockfd, level, option_name, option_value_p,
                       sizeof(option_value));
 }
 
@@ -427,6 +425,24 @@ void Socket::SetLastError(Status &error) {
 #endif
 }
 
+Status Socket::GetLastError() {
+  std::error_code EC;
+#ifdef _WIN32
+  EC = llvm::mapWindowsError(WSAGetLastError());
+#else
+  EC = std::error_code(errno, std::generic_category());
+#endif
+  return EC;
+}
+
+int Socket::CloseSocket(NativeSocket sockfd) {
+#ifdef _WIN32
+  return ::closesocket(sockfd);
+#else
+  return ::close(sockfd);
+#endif
+}
+
 NativeSocket Socket::CreateSocket(const int domain, const int type,
                                   const int protocol,
                                   bool child_processes_inherit, Status &error) {

lldb/source/Host/common/TCPSocket.cpp

@@ -33,28 +33,9 @@
 #include <winsock2.h>
 #endif
 
-#ifdef _WIN32
-#define CLOSE_SOCKET closesocket
-typedef const char *set_socket_option_arg_type;
-#else
-#include <unistd.h>
-#define CLOSE_SOCKET ::close
-typedef const void *set_socket_option_arg_type;
-#endif
-
 using namespace lldb;
 using namespace lldb_private;
 
-static Status GetLastSocketError() {
-  std::error_code EC;
-#ifdef _WIN32
-  EC = llvm::mapWindowsError(WSAGetLastError());
-#else
-  EC = std::error_code(errno, std::generic_category());
-#endif
-  return EC;
-}
-
 static const int kType = SOCK_STREAM;
 
 TCPSocket::TCPSocket(bool should_close, bool child_processes_inherit)
@@ -208,12 +189,8 @@ Status TCPSocket::Listen(llvm::StringRef name, int backlog) {
       continue;
 
     // enable local address reuse
-    int option_value = 1;
-    set_socket_option_arg_type option_value_p =
-        reinterpret_cast<set_socket_option_arg_type>(&option_value);
-    if (::setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, option_value_p,
-                     sizeof(option_value)) == -1) {
-      CLOSE_SOCKET(fd);
+    if (SetOption(fd, SOL_SOCKET, SO_REUSEADDR, 1) == -1) {
+      CloseSocket(fd);
       continue;
     }
 
@@ -229,8 +206,8 @@ Status TCPSocket::Listen(llvm::StringRef name, int backlog) {
       err = ::listen(fd, backlog);
 
     if (err == -1) {
-      error = GetLastSocketError();
-      CLOSE_SOCKET(fd);
+      error = GetLastError();
+      CloseSocket(fd);
       continue;
     }
 
@@ -251,7 +228,7 @@ Status TCPSocket::Listen(llvm::StringRef name, int backlog) {
 
 void TCPSocket::CloseListenSockets() {
   for (auto socket : m_listen_sockets)
-    CLOSE_SOCKET(socket.first);
+    CloseSocket(socket.first);
   m_listen_sockets.clear();
 }
 
@@ -280,7 +257,7 @@ llvm::Expected<std::vector<MainLoopBase::ReadHandleUP>> TCPSocket::Accept(
 
       const lldb_private::SocketAddress &AddrIn = m_listen_sockets[fd];
       if (!AddrIn.IsAnyAddr() && AcceptAddr != AddrIn) {
-        CLOSE_SOCKET(sock);
+        CloseSocket(sock);
         LLDB_LOG(log, "rejecting incoming connection from {0} (expecting {1})",
                  AcceptAddr.GetIPAddress(), AddrIn.GetIPAddress());
         return;