view docs/spec/track.tikz @ 563:c6036e0a511a

Work around the non-universality of fdatasync()

POSIX, which specifies fdatasync(), also apparently specifies that
POSIX_SYNCHRONIZED_IO is defined to a non-zero value if fdatasync() is
available -- or at least that's what the man page suggests on Linux.
This is probably good enough for us, anyway.

\draw[thick] (-2.5,-0.2) rectangle (2.5,0.2);
\draw plot[domain=-2.4:2.4,samples=250] (\x, {0.15*sin(9.2*\x r)});