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This is modelled after the existing ERRNO_IS_RESOURCES() and in particular ERRNO_IS_DISCONNECT(). It returns true for all transient network errors that should be handled like EAGAIN whenever we call accept() or accept4(). This is per documentation in the accept(2) man page that explicitly says to do so in the its "RETURN VALUE" section. The error list we cover is a bit more comprehensive, and based on existing code of ours. For example EINTR is included too (since we need that to cover cases where we call accept()/accept4() on a blocking socket), and of course ERRNO_IS_DISCONNECT() is a bit more comprehensive than the list in the man page too.
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