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app/src/netutil.c

@@ -0,0 +1,30 @@
+#include "netutil.h"
+
+#include <SDL2/SDL_net.h>
+
+// contrary to SDLNet_TCP_Send and SDLNet_TCP_Recv, SDLNet_TCP_Accept is non-blocking
+// so we need to block before calling it
+TCPsocket blocking_accept(TCPsocket server_socket) {
+    SDLNet_SocketSet set = SDLNet_AllocSocketSet(1);
+    if (!set) {
+        SDL_LogCritical(SDL_LOG_CATEGORY_SYSTEM, "Could not allocate socket set");
+        return NULL;
+    }
+
+    if (SDLNet_TCP_AddSocket(set, server_socket) == -1) {
+        SDL_LogCritical(SDL_LOG_CATEGORY_SYSTEM, "Could not add socket to set");
+        SDLNet_FreeSocketSet(set);
+        return NULL;
+    }
+
+    // timeout is (2^32-1) milliseconds, this should be sufficient
+    if (SDLNet_CheckSockets(set, -1) != 1) {
+        SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Could not check socket: %s", SDL_GetError());
+        SDLNet_FreeSocketSet(set);
+        return NULL;
+    }
+
+    SDLNet_FreeSocketSet(set);
+
+    return SDLNet_TCP_Accept(server_socket);
+}