f26d53e905
Since Linux 4.5, sendmsg(2) fails with ETOOMANYREFS if the number of "in-flight" IOs, which has been sent by sendmsg(2) but has not yet accepted by recvmsg(2), exceeds the RLIMIT_NOFILE resource limit. https://rubyci.s3.amazonaws.com/arm64-neoverse-n1/ruby-master/log/20231025T090004Z.fail.html.gz ``` 1) Error: TestSocket_UNIXSocket#test_fd_passing_race_condition: Errno::ETOOMANYREFS: Too many references: cannot splice - sendmsg(2) ``` This change reduces the number of times of IO passing under 1024, which is a default limit in many environments.