Dammit, derby, you found the escape clause :-)

In real life, foo calls a third party C library function that does use stdio for printing ... something like: 
use Inline C => <<'EOC';
#include <mpfr.h>

void foo(mpfr_t * x) {
  mpfr_out_str(*x, .......);
}

EOC

[download]
The Inline::C script that I presented was the closest thing I could think of that would actually depict the problem generically ... but, as I can now see, I stuffed up.

So ... although your response answers the question I asked, it doesn't really address the question I was hoping to be answered ... my fault, not yours.

I guess I'm really after a way of flushing the stdio printf buffer - sort of an stdio way of doing $| = 1; (if such exists).

Btw, I had long wondered about the advantages of using the PerlIO_* routines as recommended in perldoc perlclib (and other places). Your reply provides an excellent demonstration of those "advantages". Thank you.

Cheers,
Rob

In reply to Re^2: [OT]: Flushing XS buffers portably by syphilis
in thread [OT]: Flushing XS buffers portably by syphilis

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