Am 20.08.2013 17:16, schrieb Antoine Pelisse:
I was actually wondering when it's better to use xread() over read_in_full() ? Considering that we don't know if xread() will read the whole buffer or not, would it not be better to always use read_in_full() ?
Of course, you know whether the whole buffer was filled: xread() returns the number of bytes read. Same for xwrite().
I guess there is a drawback to this, but I'm not exactly sure what it is.
The disadvantage of read_in_full() is that it can happen that it reads data from the stream successfully, but then reports an error. In this case, the data read is lost.
Analogously, when write_in_full() writes (some) data successfully, but ultimately fails, you don't know how much was written successfully.
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