Dart

Flush an SFTP File to Stable Storage (Fsync)

Demonstrates the Chilkat SFtp.Fsync method, which requests that the server flush pending data for an open file to stable storage. The only argument is the handle. It uses the OpenSSH fsync@openssh.com extension and succeeds only when the server supports it.

Background: A successful write does not guarantee the data has reached disk — it may still sit in the server's write cache, where a crash or power loss would lose it. Fsync forces it to durable storage, which matters for transactional or journal-style files where a committed record must survive a failure. Because it relies on a non-standard OpenSSH extension, expect it to fail against servers that do not implement it, and treat that as a capability check rather than a hard error where appropriate.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the SFtp.Fsync method, which requests that the server flush pending data for an
  // open file to stable storage.  The only argument is the handle.

  final sftp = CkSFtp();

  // Connect, authenticate, and initialize the SFTP subsystem.
  final port = 22;
  try {
    sftp.connect('sftp.example.com', port);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Normally you would not hard-code the password in source.  You should instead obtain it
  // from an interactive prompt, environment variable, or a secrets vault.
  final password = 'mySshPassword';

  try {
    sftp.authenticatePw('mySshLogin', password);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    sftp.initializeSftp();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final String handle;
  try {
    handle = sftp.openFile('subdir/journal.log', 'writeOnly', 'openOrCreate,appendData');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Write a critical record.
  try {
    sftp.writeFileText(handle, 'utf-8', '2026-07-23 transaction committed\n');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Ask the server to flush the data to durable storage before continuing.  Fsync uses the
  // OpenSSH fsync@openssh.com extension and succeeds only when the server supports it.
  try {
    sftp.fsync(handle);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    sftp.closeHandle(handle);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Data flushed to stable storage.');

  sftp.disconnect();
}