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Ken Brown 99be238347 Cygwin: set buffer size for pipes created by non-Cygwin processes
Rename fhandler_pipe_and_fifo::max_atomic_write to pipe_buf_size.
This reflect its actual meaning better.  The fhandler_pipe_and_fifo
constructor initializes it to DEFAULT_PIPEBUFSIZE (== 64K), which is
the buffer size for the windows pipes created by fhandler_pipe and
fhandler_fifo.  But if we inherit a stdio pipe handle from a
non-Cygwin process, the buffer size could be different.

To remedy this, add a method fhandler_pipe::set_pipe_buf_size that
queries the OS for the pipe buffer size, and use it in
dtable::init_std_file_from_handle.
2021-09-13 17:45:54 +02:00
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