pthread cancellation points missing for fdatasync and lockf in some cases

[Mike Frysinger]

On Saturday 05 May 2007, Mike Frysinger wrote:
> i wanted to make sure these things werent done on purpose first ... but
> i'll post a patch

patch attached ... ive updated tst-cancel4 for fdatasync, but i didnt update 
tst-cancel16 for lockf as that test relies on lockf blocking and none of the 
other options passed to lockf will block ...

i'll tag a bug report as well
-mike
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