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if (ret == ENOSYS || err == EPERM) {

/*

* Containerized environment might not have this freshy syscall.

* Container users shouldn't run any userland requires the newer kernel than its host,

* but it's sometime impossible, so rescuing here.

* We may see EPERM when a process lacks some capabilities in Linux...

* https://bugs.ruby-lang.org/issues/14207 [ruby-dev:50376]

*/

}

else if (ret != 0) {

goto finish; /* error or success */

}