Determine the size of a pipe without calling read()

Question

I need a function called SizeOfPipe() which should return the size of a pipe - I only want to know how much data is in the pipe and not actually read data off t

Answer 1

There is no generic, portable way to tell how much data is available in a pipe without reading it. At least not under POSIX specifications.

Pipes are not seekable, and neither is it possible to put the data back into the reading end of a pipe.

Platform-specific tricks might be possible, though. If your question is platform-specific, editing your question to say so might improve your chances to get a working answer.