diff --git a/td/telegram/SecureStorage.cpp b/td/telegram/SecureStorage.cpp
index 04dca6103..34e13c600 100644
--- a/td/telegram/SecureStorage.cpp
+++ b/td/telegram/SecureStorage.cpp
@@ -352,7 +352,7 @@ Result<BufferSlice> decrypt_value(const Secret &secret, const ValueHash &hash, S
 Result<ValueHash> encrypt_file(const Secret &secret, std::string src, std::string dest) {
   TRY_RESULT(src_file, FileFd::open(src, FileFd::Flags::Read));
   TRY_RESULT(dest_file, FileFd::open(dest, FileFd::Flags::Truncate | FileFd::Flags::Write | FileFd::Create));
-  auto src_file_size = src_file.get_size();
+  TRY_RESULT(src_file_size, src_file.get_size());
 
   BufferSliceDataView random_prefix_view(gen_random_prefix(src_file_size));
   FileDataView data_view(src_file, src_file_size);
@@ -370,7 +370,7 @@ Result<ValueHash> encrypt_file(const Secret &secret, std::string src, std::strin
 Status decrypt_file(const Secret &secret, const ValueHash &hash, std::string src, std::string dest) {
   TRY_RESULT(src_file, FileFd::open(src, FileFd::Flags::Read));
   TRY_RESULT(dest_file, FileFd::open(dest, FileFd::Flags::Truncate | FileFd::Flags::Write | FileFd::Create));
-  auto src_file_size = src_file.get_size();
+  TRY_RESULT(src_file_size, src_file.get_size());
 
   FileDataView src_file_view(src_file, src_file_size);
 
diff --git a/td/telegram/cli.cpp b/td/telegram/cli.cpp
index 858e9bd0e..f7cf2aa31 100644
--- a/td/telegram/cli.cpp
+++ b/td/telegram/cli.cpp
@@ -3630,7 +3630,7 @@ class CliClient final : public Actor {
       }
 
       auto fd = r_fd.move_as_ok();
-      auto size = fd.get_size();
+      auto size = fd.get_size().move_as_ok();
       fd.seek(size).ignore();
       fd.write("a").ignore();
       fd.seek(size).ignore();
diff --git a/td/telegram/files/FileHashUploader.cpp b/td/telegram/files/FileHashUploader.cpp
index 1a24ad67a..7407fe054 100644
--- a/td/telegram/files/FileHashUploader.cpp
+++ b/td/telegram/files/FileHashUploader.cpp
@@ -37,7 +37,8 @@ void FileHashUploader::start_up() {
 
 Status FileHashUploader::init() {
   TRY_RESULT(fd, FileFd::open(local_.path_, FileFd::Read));
-  if (fd.get_size() != size_) {
+  TRY_RESULT(file_size, fd.get_size());
+  if (file_size != size_) {
     return Status::Error("size mismatch");
   }
   fd_ = BufferedFd<FileFd>(std::move(fd));
diff --git a/td/telegram/files/FileLoaderUtils.cpp b/td/telegram/files/FileLoaderUtils.cpp
index 8acb3444c..92a14d988 100644
--- a/td/telegram/files/FileLoaderUtils.cpp
+++ b/td/telegram/files/FileLoaderUtils.cpp
@@ -130,7 +130,8 @@ Result<string> search_file(CSlice dir, CSlice name, int64 expected_size) {
     FileFd fd;
     std::string path;
     std::tie(fd, path) = r_pair.move_as_ok();
-    if (fd.stat().size_ != expected_size) {
+    auto r_size = fd.get_size();
+    if (r_size.is_error() || r_size.ok() != expected_size) {
       return true;
     }
     fd.close();
diff --git a/td/telegram/files/FileUploader.cpp b/td/telegram/files/FileUploader.cpp
index 0bcc044bc..d46110197 100644
--- a/td/telegram/files/FileUploader.cpp
+++ b/td/telegram/files/FileUploader.cpp
@@ -164,13 +164,13 @@ Result<FileLoader::PrefixInfo> FileUploader::on_update_local_location(const Loca
 
   if (local_is_ready) {
     CHECK(!fd_.empty());
-    local_size = fd_.get_size();
+    TRY_RESULT(local_size, fd_.get_size());
     LOG(INFO) << "Set file local_size to " << local_size;
     if (local_size == 0) {
       return Status::Error("Can't upload empty file");
     }
   } else if (!fd_.empty()) {
-    auto real_local_size = fd_.get_size();
+    TRY_RESULT(real_local_size, fd_.get_size());
     if (real_local_size < local_size) {
       LOG(ERROR) << tag("real_local_size", real_local_size) << " < " << tag("local_size", local_size);
       PrefixInfo info;
diff --git a/tddb/td/db/binlog/Binlog.cpp b/tddb/td/db/binlog/Binlog.cpp
index f5361620b..29904acd6 100644
--- a/tddb/td/db/binlog/Binlog.cpp
+++ b/tddb/td/db/binlog/Binlog.cpp
@@ -445,7 +445,9 @@ void Binlog::update_read_encryption() {
   CHECK(binlog_reader_ptr_);
   switch (encryption_type_) {
     case EncryptionType::None: {
-      binlog_reader_ptr_->set_input(&buffer_reader_, false, fd_.get_size());
+      auto r_file_size = fd_.get_size();
+      r_file_size.ensure();
+      binlog_reader_ptr_->set_input(&buffer_reader_, false, r_file_size.ok());
       byte_flow_flag_ = false;
       break;
     }
@@ -456,7 +458,9 @@ void Binlog::update_read_encryption() {
       byte_flow_sink_ = ByteFlowSink();
       byte_flow_source_ >> aes_xcode_byte_flow_ >> byte_flow_sink_;
       byte_flow_flag_ = true;
-      binlog_reader_ptr_->set_input(byte_flow_sink_.get_output(), true, fd_.get_size());
+      auto r_file_size = fd_.get_size();
+      r_file_size.ensure();
+      binlog_reader_ptr_->set_input(byte_flow_sink_.get_output(), true, r_file_size.ok());
       break;
     }
   }
@@ -549,7 +553,7 @@ Status Binlog::load_binlog(const Callback &callback, const Callback &debug_callb
     }
   });
 
-  auto fd_size = fd_.get_size();
+  TRY_RESULT(fd_size, fd_.get_size());
   if (offset != fd_size) {
     LOG(ERROR) << "Truncate " << tag("path", path_) << tag("old_size", fd_size) << tag("new_size", offset);
     fd_.seek(offset).ensure();
diff --git a/tdutils/td/utils/FileLog.cpp b/tdutils/td/utils/FileLog.cpp
index 7c107a573..3e892d250 100644
--- a/tdutils/td/utils/FileLog.cpp
+++ b/tdutils/td/utils/FileLog.cpp
@@ -40,7 +40,8 @@ Status FileLog::init(string path, int64 rotate_threshold) {
   } else {
     path_ = r_path.move_as_ok();
   }
-  size_ = fd_.get_size();
+  TRY_RESULT(size, fd_.get_size());
+  size_ = size;
   rotate_threshold_ = rotate_threshold;
   return Status::OK();
 }
diff --git a/tdutils/td/utils/filesystem.cpp b/tdutils/td/utils/filesystem.cpp
index 57502ef98..e7f89a983 100644
--- a/tdutils/td/utils/filesystem.cpp
+++ b/tdutils/td/utils/filesystem.cpp
@@ -37,7 +37,8 @@ template <class T>
 Result<T> read_file_impl(CSlice path, int64 size, int64 offset) {
   TRY_RESULT(from_file, FileFd::open(path, FileFd::Read));
   if (size == -1) {
-    size = from_file.get_size();
+    TRY_RESULT(file_size, from_file.get_size());
+    size = file_size;
   }
   if (size < 0) {
     return Status::Error("Failed to read file: invalid size");
diff --git a/tdutils/td/utils/port/FileFd.cpp b/tdutils/td/utils/port/FileFd.cpp
index d504039a5..f978d111b 100644
--- a/tdutils/td/utils/port/FileFd.cpp
+++ b/tdutils/td/utils/port/FileFd.cpp
@@ -424,8 +424,9 @@ NativeFd FileFd::move_as_native_fd() {
   return res;
 }
 
-int64 FileFd::get_size() {
-  return stat().size_;
+Result<int64> FileFd::get_size() {
+  TRY_RESULT(s, stat());
+  return s.size_;
 }
 
 #if TD_PORT_WINDOWS
@@ -435,7 +436,7 @@ static uint64 filetime_to_unix_time_nsec(LONGLONG filetime) {
 }
 #endif
 
-Stat FileFd::stat() {
+Result<Stat> FileFd::stat() {
   CHECK(!empty());
 #if TD_PORT_POSIX
   return detail::fstat(get_native_fd().fd());
diff --git a/tdutils/td/utils/port/FileFd.h b/tdutils/td/utils/port/FileFd.h
index bd187fcac..8c6b1f635 100644
--- a/tdutils/td/utils/port/FileFd.h
+++ b/tdutils/td/utils/port/FileFd.h
@@ -49,9 +49,9 @@ class FileFd {
   void close();
   bool empty() const;
 
-  int64 get_size();
+  Result<int64> get_size();
 
-  Stat stat();
+  Result<Stat> stat();
 
   Status sync() TD_WARN_UNUSED_RESULT;
 
diff --git a/tdutils/td/utils/port/Stat.cpp b/tdutils/td/utils/port/Stat.cpp
index d22e07955..56d4228c4 100644
--- a/tdutils/td/utils/port/Stat.cpp
+++ b/tdutils/td/utils/port/Stat.cpp
@@ -111,11 +111,13 @@ Stat from_native_stat(const struct ::stat &buf) {
   return res;
 }
 
-Stat fstat(int native_fd) {
+Result<Stat> fstat(int native_fd) {
   struct ::stat buf;
   int err = detail::skip_eintr([&] { return ::fstat(native_fd, &buf); });
   auto fstat_errno = errno;
-  LOG_IF(FATAL, err < 0) << Status::PosixError(fstat_errno, PSLICE() << "Stat for fd " << native_fd << " failed");
+  if (err < 0) {
+    return Status::PosixError(fstat_errno, PSLICE() << "Stat for fd " << native_fd << " failed");
+  }
   return detail::from_native_stat(buf);
 }
 
@@ -135,7 +137,7 @@ Status update_atime(int native_fd) {
   }
   return Status::OK();
 #elif TD_DARWIN
-  auto info = fstat(native_fd);
+  TRY_RESULT(info, fstat(native_fd));
   timeval upd[2];
   auto now = Clocks::system();
   // access time
diff --git a/tdutils/td/utils/port/Stat.h b/tdutils/td/utils/port/Stat.h
index 0e01b0e81..01072715c 100644
--- a/tdutils/td/utils/port/Stat.h
+++ b/tdutils/td/utils/port/Stat.h
@@ -34,7 +34,7 @@ Result<CpuStat> cpu_stat() TD_WARN_UNUSED_RESULT;
 #if TD_PORT_POSIX
 
 namespace detail {
-Stat fstat(int native_fd);  // TODO return Result<Stat>
+Result<Stat> fstat(int native_fd);
 }  // namespace detail
 
 Status update_atime(CSlice path) TD_WARN_UNUSED_RESULT;
diff --git a/tdutils/td/utils/port/path.cpp b/tdutils/td/utils/port/path.cpp
index 6d9d9ee8f..8dcbc54f8 100644
--- a/tdutils/td/utils/port/path.cpp
+++ b/tdutils/td/utils/port/path.cpp
@@ -359,7 +359,8 @@ Result<bool> walk_path_file(string &path, const WalkFunction &func) {
 
 Result<bool> walk_path(string &path, const WalkFunction &func) {
   TRY_RESULT(fd, FileFd::open(path, FileFd::Read));
-  auto stat = fd.stat();
+  TRY_RESULT(stat, fd.stat());
+
   bool is_dir = stat.is_dir_;
   bool is_reg = stat.is_reg_;
   if (is_dir) {
diff --git a/tdutils/test/port.cpp b/tdutils/test/port.cpp
index 5c71914bd..57375d965 100644
--- a/tdutils/test/port.cpp
+++ b/tdutils/test/port.cpp
@@ -35,47 +35,41 @@ TEST(Port, files) {
   int cnt = 0;
   const int ITER_COUNT = 1000;
   for (int i = 0; i < ITER_COUNT; i++) {
-    walk_path(main_dir,
-              [&](CSlice name, WalkPath::Type type) {
-                if (type == WalkPath::Type::NotDir) {
-                  ASSERT_TRUE(name == fd_path || name == fd2_path);
-                }
-                cnt++;
-              })
-        .ensure();
+    walk_path(main_dir, [&](CSlice name, WalkPath::Type type) {
+      if (type == WalkPath::Type::NotDir) {
+        ASSERT_TRUE(name == fd_path || name == fd2_path);
+      }
+      cnt++;
+    }).ensure();
   }
   ASSERT_EQ((5 * 2 + 2) * ITER_COUNT, cnt);
   bool was_abort = false;
-  walk_path(main_dir,
-            [&](CSlice name, WalkPath::Type type) {
-              CHECK(!was_abort);
-              if (type == WalkPath::Type::EnterDir && ends_with(name, PSLICE() << TD_DIR_SLASH << "B")) {
-                was_abort = true;
-                return WalkPath::Action::Abort;
-              }
-              return WalkPath::Action::Continue;
-            })
-      .ensure();
+  walk_path(main_dir, [&](CSlice name, WalkPath::Type type) {
+    CHECK(!was_abort);
+    if (type == WalkPath::Type::EnterDir && ends_with(name, PSLICE() << TD_DIR_SLASH << "B")) {
+      was_abort = true;
+      return WalkPath::Action::Abort;
+    }
+    return WalkPath::Action::Continue;
+  }).ensure();
   CHECK(was_abort);
 
   cnt = 0;
   bool is_first_dir = true;
-  walk_path(main_dir,
-            [&](CSlice name, WalkPath::Type type) {
-              cnt++;
-              if (type == WalkPath::Type::EnterDir) {
-                if (is_first_dir) {
-                  is_first_dir = false;
-                } else {
-                  return WalkPath::Action::SkipDir;
-                }
-              }
-              return WalkPath::Action::Continue;
-            })
-      .ensure();
+  walk_path(main_dir, [&](CSlice name, WalkPath::Type type) {
+    cnt++;
+    if (type == WalkPath::Type::EnterDir) {
+      if (is_first_dir) {
+        is_first_dir = false;
+      } else {
+        return WalkPath::Action::SkipDir;
+      }
+    }
+    return WalkPath::Action::Continue;
+  }).ensure();
   ASSERT_EQ(6, cnt);
 
-  ASSERT_EQ(0u, fd.get_size());
+  ASSERT_EQ(0u, fd.get_size().move_as_ok());
   ASSERT_EQ(12u, fd.write("Hello world!").move_as_ok());
   ASSERT_EQ(4u, fd.pwrite("abcd", 1).move_as_ok());
   char buf[100];
@@ -86,7 +80,7 @@ TEST(Port, files) {
 
   ASSERT_TRUE(FileFd::open(main_dir, FileFd::Read | FileFd::CreateNew).is_error());
   fd = FileFd::open(fd_path, FileFd::Read | FileFd::Create).move_as_ok();
-  ASSERT_EQ(13u, fd.get_size());
+  ASSERT_EQ(13u, fd.get_size().move_as_ok());
   ASSERT_EQ(4u, fd.pread(buf_slice.substr(0, 4), 1).move_as_ok());
   ASSERT_STREQ("abcd", buf_slice.substr(0, 4));