Em ter., 15 de set. de 2020 às 14:54, Alvaro Herrera < alvhe...@2ndquadrant.com> escreveu:
> I think you meant _IONBF instead of _IOFBF -- otherwise it's at odds > with the comment you add. But what is the justification for that > addition? I don't see us doing that anywhere else. > No. _IOFBF *Full buffering:* On output, data is written once the buffer is full (or flushed <http://www.cplusplus.com/fflush>). On Input, the buffer is filled when an input operation is requested and the buffer is empty. * _IONBF No buffering:* No buffer is used. Each I/O operation is written as soon as possible. In this case, the *buffer* and *size* parameters are ignored. _IONBF ignores buffer and size. Without setvbuf, fread uses an internal buffer, default 4096 bytes (OS dependent). If fread uses an internal buffer, then it needs a copy to the buffer provided by the function. setvbuf, does the same as read function low level, copies directly to the final buffer. regards, Ranier Vilela
