Move initialization of /dev/zero and /dev/null, meet POSIX standard

core/fileManager/fileManager.cpp

@@ -90,8 +90,6 @@ class FileManager: public IFileManager {
     assert(addFile(createType_in(), "/dev/stdin") == 0);
     assert(addFile(createType_out(SCE_TYPEOUT_ERROR), "/dev/stdout") == 1);
     assert(addFile(createType_out(SCE_TYPEOUT_DEBUG), "/dev/stderr") == 2);
-    addFile(createType_zero(), "/dev/zero");
-    addFile(createType_null(), "/dev/null");
   }
 
   void addMountPoint(std::string_view mountPoint, std::filesystem::path const& root, MountType type) final {

core/fileManager/types/type_null.cpp

@@ -24,7 +24,7 @@ std::unique_ptr<IFile> createType_null() {
 }
 
 size_t TypeNull::read(void* buf, size_t nbytes) {
-  return nbytes;
+  return -1;
 }
 
 size_t TypeNull::write(void* buf, size_t nbytes) {

core/fileManager/types/type_zero.cpp

@@ -30,7 +30,7 @@ size_t TypeZero::read(void* buf, size_t nbytes) {
 }
 
 size_t TypeZero::write(void* buf, size_t nbytes) {
-  return 0;
+  return nbytes;
 }
 
 void TypeZero::sync() {}

core/kernel/filesystem.cpp

@@ -5,6 +5,8 @@
 #include "core/fileManager/types/type_file.h"
 #include "core/fileManager/types/type_random.h"
 #include "core/fileManager/types/type_rng.h"
+#include "core/fileManager/types/type_null.h"
+#include "core/fileManager/types/type_zero.h"
 #include "core/memory/memory.h"
 #include "logging.h"
 
@@ -37,6 +39,10 @@ std::unique_ptr<IFile> createType_dev(std::filesystem::path path, std::ios_base:
     return createType_random();
   } else if (path == "/dev/rng") {
     return createType_rng();
+  } else if (path == "/dev/zero") {
+    return createType_zero();
+  } else if (path == "/dev/null") {
+    return createType_null();
   } else { // todo: other devices
     LOG_CRIT(L"%S: unknown device!", path.c_str());
   }