[K42-discussion] Another problem with asynchrony

[Bryan S Rosenburg]

Okay.  I've changed my mind.  (Thanks for the input from Paul and Chris.)

I've decided to put a check for EPIPE in FileLinuxStream, which is the 
client-side object used for sockets and pipes.  The check won't affect 
writes to regular files.  Furthermore, FileLinuxStream already checks for 
failure, so the additional check for EPIPE won't affect successful writes.

I discovered that the Posix spec for write() says that writes to sockets 
as well as to pipes may return EPIPE and generate SIGPIPE, so 
FileLinuxStream is even starting to look like the right place for the 
signal generation.

At first cut, SIGPIPE generation seems to work as expected in 
FileLinuxStream.  I'll commit it after a bit more testing.

- Bryan
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