Function writeSync

lib/internal/fs/promises.js:945–974

(chunk)

      },

      writeSync(chunk) {
        if (error || closed || asyncPending) return false;
        chunk = newStreamsToUint8Array(chunk);
        const length = chunk.byteLength;
        if (length > syncWriteThreshold) return false;
        if (length === 0) return true;
        if (bytesRemaining >= 0 && length > bytesRemaining) return false;
        const position = pos;
        // First attempt - if this fails with zero bytes written,
        // return false so pipeTo can fall back to async write().
        const ctx = {};
        const bytesWritten = binding.writeBuffer(
          fd, chunk, 0, length, position, undefined, ctx) || 0;
        if (ctx.errno !== undefined) return false;
        totalBytesWritten += bytesWritten;
        if (position >= 0) {
          pos = position + bytesWritten;
        }
        if (bytesWritten === length) {
          if (bytesRemaining > 0) bytesRemaining -= length;
          return true;
        }
        // Partial write - bytes are on disk. Must complete or throw.
        // Cannot return false here because pipeTo would re-send the
        // full chunk, causing duplicate data on disk.
        writeSyncAll(chunk, bytesWritten, length - bytesWritten,
                     position >= 0 ? position + bytesWritten : -1);
        if (bytesRemaining > 0) bytesRemaining -= length;
        return true;
      },

      writevSync(chunks) {
        if (error || closed || asyncPending) return false;