view docs/spec/fv0.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.

\foreach \y/\col in {0/53,0.2/32,0.4/37,0.6/4,0.8/63} {
  \fill[black!\col!white] ($(-0.1,0)+(0,\y)$) rectangle ($(0.1,0.2)+(0,\y)$);
}