Disable stdout during vulkan operations

src/common/io.c

@@ -462,3 +462,34 @@ bool ffGetFileContent(const char* fileName, FFstrbuf* buffer)
     ffStrbufClear(buffer);
     return ffAppendFileContent(fileName, buffer);
 }
+
+static volatile bool originalPipesSet = false;
+static volatile int originalStdout = -1;
+static volatile int originalStderr = -1;
+
+void ffDisableOutput()
+{
+    fflush(stdout);
+    fflush(stderr);
+
+    if(!originalPipesSet)
+    {
+        originalStdout = dup(STDOUT_FILENO);
+        originalStderr = dup(STDERR_FILENO);
+        originalPipesSet = true;
+    }
+
+    int nullFile = open("/dev/null", O_WRONLY);
+    dup2(nullFile, STDOUT_FILENO);
+    dup2(nullFile, STDERR_FILENO);
+    close(nullFile);
+}
+
+void ffEnableOutput()
+{
+    fflush(stdout);
+    fflush(stderr);
+
+    dup2(originalStdout, STDOUT_FILENO);
+    dup2(originalStderr, STDERR_FILENO);
+}

src/fastfetch.h

@@ -328,6 +328,9 @@ bool ffGetFileContent(const char* fileName, FFstrbuf* buffer);
 bool ffWriteFDContent(int fd, const FFstrbuf* content);
 void ffWriteFileContent(const char* fileName, const FFstrbuf* buffer);
 
+void ffDisableOutput();
+void ffEnableOutput();
+
 // They return true if the file was found, independently if start was found
 // Buffers which already contain content are not overwritten
 // The last occurence of start in the first file will be the one used

src/modules/gpu.c

@@ -22,6 +22,10 @@ static void vulkanFillGPUs(FFinstance* instance, FFlist* results)
     FF_LIBRARY_LOAD_SYMBOL(vulkan, vkEnumeratePhysicalDevices,)
     FF_LIBRARY_LOAD_SYMBOL(vulkan, vkGetPhysicalDeviceProperties,)
 
+    //Some drivers (nvdc) print messages to stdout
+    //and thats the best way i found to disable that
+    ffDisableOutput();
+
     const VkApplicationInfo applicationInfo = {
         .sType = VK_STRUCTURE_TYPE_APPLICATION_INFO,
         .pNext = NULL,
@@ -47,6 +51,7 @@ static void vulkanFillGPUs(FFinstance* instance, FFlist* results)
     if(ffvkCreateInstance(&instanceCreateInfo, NULL, &vkInstance) != VK_SUCCESS)
     {
         dlclose(vulkan);
+        ffEnableOutput();
         return;
     }
 
@@ -55,6 +60,7 @@ static void vulkanFillGPUs(FFinstance* instance, FFlist* results)
     {
         ffvkDestroyInstance(vkInstance, NULL);
         dlclose(vulkan);
+        ffEnableOutput();
         return;
     }
 
@@ -64,6 +70,7 @@ static void vulkanFillGPUs(FFinstance* instance, FFlist* results)
         free(physicalDevices);
         ffvkDestroyInstance(vkInstance, NULL);
         dlclose(vulkan);
+        ffEnableOutput();
         return;
     }
 
@@ -86,6 +93,7 @@ static void vulkanFillGPUs(FFinstance* instance, FFlist* results)
     free(physicalDevices);
     ffvkDestroyInstance(vkInstance, NULL);
     dlclose(vulkan);
+    ffEnableOutput();
     return;
 }