Fix poll() implementation of WaitLatchOrSocket to notice postmaster death.

When the remote end of the pipe is closed, select() reports the fd as
readable, but poll() has a separate POLLHUP return code for that.

Spotted by Peter Geoghegan.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/b2b4af535eb733ba0c2ea6eeb2b14cac7f1ca4be

Modified Files
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src/backend/port/unix_latch.c |    7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)

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