An application that opens many files and doesn't use `select`, should raise its own soft-limit to match the hard-limit (or a reasonable number below the hard li

An application that opens many files and doesn't use `select`, should raise its own soft-limit to match the hard-limit (or a reasonable number below the hard limit, if it wants to self-limit for some reason). The default soft-limit should match FD_SETSIZE and should not be raised globally by the user. I don't know why the default hard limit is 256 and not 1024. Perhaps FD_SETSIZE was lower than 1024 historically?