#40 sendfile, what is the 3rd argument

[Nigel Horne]

According to utd.h it's a reference to a 64-bit number:

UDT_API int64_t sendfile(UDTSOCKET u, std::fstream& ifs, int64_t& offset, int64_t size, int block = 364000);

According to the documentation, it's a 64-bit number (no reference):

int64_t sendfile(
UDTSOCKET u,
fstream& ifs,
const int64_t offset,
const int64_t size,
const int block = 7320000
);

Which is it?

[Mikhail T.]

The offset argument specifies where to begin in the file -- in case, you don't want to send all of it...