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README.freebsd - Perl version 5 on FreeBSD systems


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 5.8.0 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 reading the symlink /proc/curproc/file. FreeBSD has a bug where reading this symlink 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.


Nicholas Clark <>, collating wisdom supplied by Slaven Rezic and Tim Bunce.

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