Stdout redirecting?

You can use a single call to the C89 setvbuf() to avoid cluttering your code with fflush() s. Or maybe the wrapper setlinebuf().

You can use a single call to the C89 setvbuf() to avoid cluttering your code with fflush()'s. Or maybe the wrapper setlinebuf(). But all of the above just flush the buffers.

You may need to use fsync().

Edit: see e.g. Stackoverflow. Com/q/7145134/318716 – Joseph Quinsey Oct 15 at 21:41 Another edit: see stackoverflow.Com/questions/2340610/… for fflush vs fsync. – Joseph Quinsey Oct 15 at 21:46 Using setvbuf() with _IOLBF is normally sufficient - unless you have very unusual requirements.

– Jonathan Leffler Oct 15 at 22:10.

This is normal behavior in buffered I/O. Nothing strange should happen with a flush. However, you shouldn't be messing with stdout in this case.

Open your file with fopen, you'll get a FILE pointer. Use this pointer in functions like fprintf to print directly in it, and flush it if you need immediate results. Don't forget to close the file with fclose when you're done.

He might not have the source code for the parts that call printf. – Jörgen Sigvardsson Oct 18 at 16:08.

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