{

EM_ASM(

var stream = FS.open('testfile', 'w+');

var data = new Uint8Array(128);

var str = "Hello! ";

stringToUTF8Array(str, data, 0, lengthBytesUTF8(str)+1);

data = data.subarray(0, lengthBytesUTF8(str));

FS.write(stream, data, 0, lengthBytesUTF8(str), 0, /*canOwn=*/true);

var pos = lengthBytesUTF8(str);

str = '1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890';

data = new Uint8Array(100);

stringToUTF8Array(str, data, 0, lengthBytesUTF8(str)+1);

FS.write(stream, data, 0, lengthBytesUTF8(str)+1, pos, /*canOwn=*/false);

FS.close(stream);

var ex;

try {

FS.write(stream, data, 0, lengthBytesUTF8(str)+1, pos, /*canOwn=*/false);

} catch (err) {

ex = err;

}

assert(ex.name === 'ErrnoError' && ex.errno === 8 /* EBADF */)

);

std::ifstream file("testfile");

std::string line;

getline(file, line);

std::cout << "read " << line << std::endl;

return 0;