How to create pipe without buffer in C?

Question

I want to create pipe without buffer, but I've found only setbuf() function that works only for file descriptors. Can you suggest something similar to it for pipes?

Answer 1

If you created the pipe with pipe, then you have already unbuffered file descriptors, besides the system buffers of course.

setbuf is for stdio files only and doesn't interfere, if you use plain system file descriptors.