--- name: "perlfreebsd" section: "1" platform: "linux" package: "perl-doc" version: "5.40.1-6+deb13u1" release: "Debian 13 (Trixie)" platforms: ["linux"] url: "https://new.carta.tech/perlfreebsd" --- # perlfreebsd(1) Perl version 5 on FreeBSD systems ## NAME perlfreebsd - Perl version 5 on FreeBSD systems ## DESCRIPTION This document describes various features of FreeBSD that will affect how Perl version 5 (hereafter just Perl) is compiled and/or runs. ### FreeBSD core dumps from readdir\_r with ithreads When perl is configured to use ithreads, it will use re-entrant library calls in preference to non-re-entrant versions. There is a bug in FreeBSD's `"readdir_r"` function in versions 4.5 and earlier that can cause a SEGV when reading large directories. A patch for FreeBSD libc is available (see \) which has been integrated into FreeBSD 4.6. ### $^X doesn't always contain a full path in FreeBSD perl sets `$^X` where possible to a full path by asking the operating system. On FreeBSD the full path of the perl interpreter is found by using `"sysctl"` with `"KERN_PROC_PATHNAME"` if that is supported, else by reading the symlink */proc/curproc/file*. FreeBSD 7 and earlier has a bug where either approach sometimes returns an incorrect value (see \). In these cases perl will fall back to the old behaviour of using C's `"argv[0]"` value for `$^X`. ## AUTHOR Nicholas Clark \, collating wisdom supplied by Slaven Rezic and Tim Bunce. Please report any errors, updates, or suggestions to \.