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950c81858c
Summary:
The loop took care to advance `b` to match the amount
of data that it had processed, but was still passing `buf`
(the unadjusted start of the buffer) to the syscalls.
This meant that in situations where a `readFull` might
encounter a partial read, it would scribble over the start
of the buffer and leave junk at the end.
For example:
write("hell");
write("o");
could produce "oell?" in the buffer when `readFull` consumes
the other end of the pipe.
Reviewed By: xavierd
Differential Revision: D23486270
fbshipit-source-id: 0848f6789b44421b609b91fe08890768ff59f7f5
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