Merge bitcoin/bitcoin#22052: net: remove non-blocking bool from interface

c71117f net: remove non-blocking bool from interface (Bushstar)

Pull request description:

  SetSocketNonBlocking was added in 0.11 in the PR below with a second argument to toggle non-blocking mode for the socket. That argument has always been set to true in all subsequent releases and I'm not sure why it is present.

  bitcoin/bitcoin#4491

ACKs for top commit:
  promag:
    Code review ACK c71117f.
  lsilva01:
    Code review ACK bitcoin/bitcoin@c71117f
  vasild:
    ACK c71117f

Tree-SHA512: feebfcfa75d997460a0ba42ffe1e0c25a7e0bfcad12510ad73ea4942cc1c653f9ad429adbbb00b9288fe319009552906fcb635a14dfd7dcbde3853baab6be065

Author: laanwj

src/netbase.cpp

@@ -305,7 +305,7 @@ enum class IntrRecvError {
  *
  * @see This function can be interrupted by calling InterruptSocks5(bool).
  *      Sockets can be made non-blocking with SetSocketNonBlocking(const
- *      SOCKET&, bool).
+ *      SOCKET&).
  */
 static IntrRecvError InterruptibleRecv(uint8_t* data, size_t len, int timeout, const Sock& sock)
 {
@@ -518,7 +518,7 @@ std::unique_ptr<Sock> CreateSockTCP(const CService& address_family)
     SetSocketNoDelay(hSocket);
 
     // Set the non-blocking option on the socket.
-    if (!SetSocketNonBlocking(hSocket, true)) {
+    if (!SetSocketNonBlocking(hSocket)) {
         CloseSocket(hSocket);
         LogPrintf("Error setting socket to non-blocking: %s\n", NetworkErrorString(WSAGetLastError()));
         return nullptr;
@@ -711,28 +711,16 @@ bool LookupSubNet(const std::string& subnet_str, CSubNet& subnet_out)
     return false;
 }
 
-bool SetSocketNonBlocking(const SOCKET& hSocket, bool fNonBlocking)
+bool SetSocketNonBlocking(const SOCKET& hSocket)
 {
-    if (fNonBlocking) {
 #ifdef WIN32
-        u_long nOne = 1;
-        if (ioctlsocket(hSocket, FIONBIO, &nOne) == SOCKET_ERROR) {
+    u_long nOne = 1;
+    if (ioctlsocket(hSocket, FIONBIO, &nOne) == SOCKET_ERROR) {
 #else
-        int fFlags = fcntl(hSocket, F_GETFL, 0);
-        if (fcntl(hSocket, F_SETFL, fFlags | O_NONBLOCK) == SOCKET_ERROR) {
+    int fFlags = fcntl(hSocket, F_GETFL, 0);
+    if (fcntl(hSocket, F_SETFL, fFlags | O_NONBLOCK) == SOCKET_ERROR) {
 #endif
-            return false;
-        }
-    } else {
-#ifdef WIN32
-        u_long nZero = 0;
-        if (ioctlsocket(hSocket, FIONBIO, &nZero) == SOCKET_ERROR) {
-#else
-        int fFlags = fcntl(hSocket, F_GETFL, 0);
-        if (fcntl(hSocket, F_SETFL, fFlags & ~O_NONBLOCK) == SOCKET_ERROR) {
-#endif
-            return false;
-        }
+        return false;
     }
 
     return true;

src/netbase.h

@@ -221,8 +221,8 @@ bool ConnectSocketDirectly(const CService &addrConnect, const Sock& sock, int nT
  */
 bool ConnectThroughProxy(const Proxy& proxy, const std::string& strDest, uint16_t port, const Sock& sock, int nTimeout, bool& outProxyConnectionFailed);
 
-/** Disable or enable blocking-mode for a socket */
-bool SetSocketNonBlocking(const SOCKET& hSocket, bool fNonBlocking);
+/** Enable non-blocking mode for a socket */
+bool SetSocketNonBlocking(const SOCKET& hSocket);
 /** Set the TCP_NODELAY flag on a socket */
 bool SetSocketNoDelay(const SOCKET& hSocket);
 void InterruptSocks5(bool interrupt);