FreeBSD has added the pdopenpid() system call. It is the FreeBSD equivalent of pidfd_open() on Linux. kern: add pdopenpid(2) https://github.com/freebsd/freebsd-src/commit/5c32aa785184bb1e646b0b4c73d3c5fd9a6b8951 pdfork.2: document pdopenpid(2) https://github.com/freebsd/freebsd-src/commit/3e8b68c26e2b108dac96517ef8fd26fe7dce5bcd sys: add pdopenpid(2) https://reviews.freebsd.org/D57124