Function writevSync

lib/internal/fs/promises.js:976–1010

(chunks)

      },

      writevSync(chunks) {
        if (error || closed || asyncPending) return false;
        chunks = newStreamsConvertChunks(chunks);
        let totalSize = 0;
        for (let i = 0; i < chunks.length; i++) {
          totalSize += chunks[i].byteLength;
        }
        if (totalSize > syncWriteThreshold) return false;
        if (totalSize === 0) return true;
        if (bytesRemaining >= 0 && totalSize > bytesRemaining) return false;
        const position = pos;
        // writeBuffers throws on error (zero bytes written) - safe
        // to catch and return false for async fallback.
        let bytesWritten;
        try {
          bytesWritten = binding.writeBuffers(fd, chunks, position) || 0;
        } catch {
          return false;
        }
        totalBytesWritten += bytesWritten;
        if (position >= 0) {
          pos = position + bytesWritten;
        }
        if (bytesWritten === totalSize) {
          if (bytesRemaining > 0) bytesRemaining -= totalSize;
          return true;
        }
        // Partial writev - bytes are on disk. Must complete or throw.
        const rest = Buffer.concat(chunks);
        writeSyncAll(rest, bytesWritten,
                     rest.byteLength - bytesWritten,
                     position >= 0 ? position + bytesWritten : -1);
        if (bytesRemaining > 0) bytesRemaining -= totalSize;
        return true;
      },

      end(options = kNullPrototo) {
        if (error) {