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ef844ce433
So far fhandler_pipe_fifo::raw_write always returns -1/EINTR if a signal arrived. Linux does not do that if there's still space left in the pipe buffer. The Linux buffer handling can't be emulated by Cygwin, but we can do something similar which makes it much more likely to still write successfully even if the buffer is almost full. Utilize pipe_data_available to return valid pipe buffer usage to raw_write, allowing a more sophisticated way to fill the buffer while maintaining comaptibility with non-Cygwin pipes. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>