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This is in a new shared memory section. We will use it for temporary storage of the owner's fc_handler list when we need to change owner. The new owner can then duplicate the pipe handles from that list before taking ownership. Add several shared data members and methods that are needed for the duplication process Add methods update_my_handlers and update_shared_handlers that carry out the duplication. Allow the shared list to grow dynamically, up to a point. Do this by initially reserving a block of memory (currently 100 pages) and only committing pages as needed. Add methods create_shared_fc_handler, reopen_shared_fc_handler, and remap_shared_fc_handler to create the new shared memory section, reopen it, and commit new pages. The first is called in open, the second is called in dup/fork/exec, and the third is called in update_shared_handlers if more shared memory is needed. Modify the fifo_reader_thread function to call update_my_handlers when it finds that there is no owner. Also make it call update_shared_handlers when the owner's thread terminates, so that the new owner will have an accurate shared fc_handler list from which to duplicate. For convenience, add new methods cleanup_handlers and close_all_handlers. And add an optional arg to add_client_handler that allows it to create a new fifo_client_handler without creating a new pipe instance.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cygwin documentation is available on the net at https://cygwin.com You might especially be interested in https://cygwin.com/faq/faq.html#faq.programming.building-cygwin