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7720ea9679
Add a data member _ndesc to the af_unix_shmem_t class, along with methods to increment and decrement it. Increment it during socket/fork/exec/dup, and decrement it during close. When the last descriptor is closed, call shutdown (SHUT_RDWR) and unlink the socket's message queue. The shutdown call will make the socket's peer see EPIPE if it tries to write.
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