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.IX Title "PERLFREEBSD 1"
.TH PERLFREEBSD 1 2024-04-17 "perl v5.38.2" "Perl Programmers Reference Guide"
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.SH NAME
perlfreebsd \- Perl version 5 on FreeBSD systems
.SH DESCRIPTION
.IX Header "DESCRIPTION"
This document describes various features of FreeBSD that will affect how Perl
version 5 (hereafter just Perl) is compiled and/or runs.
.SS "FreeBSD core dumps from readdir_r with ithreads"
.IX Subsection "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
\&\f(CW\*(C`readdir_r\*(C'\fR function in versions 4.5 and earlier that can cause a SEGV when
reading large directories. A patch for FreeBSD libc is available
(see <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=30631>)
which has been integrated into FreeBSD 4.6.
.ie n .SS "$^X doesn't always contain a full path in FreeBSD"
.el .SS "\f(CW$^X\fP doesn't always contain a full path in FreeBSD"
.IX Subsection "$^X doesn't always contain a full path in FreeBSD"
perl sets \f(CW$^X\fR where possible to a full path by asking the operating
system. On FreeBSD the full path of the perl interpreter is found by using
\&\f(CW\*(C`sysctl\*(C'\fR with \f(CW\*(C`KERN_PROC_PATHNAME\*(C'\fR if that is supported, else by reading
the symlink \fI/proc/curproc/file\fR. FreeBSD 7 and earlier has a bug where
either approach sometimes returns an incorrect value
(see <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=35703>).
In these cases perl will fall back to the old behaviour of using C's
\&\f(CW\*(C`argv[0]\*(C'\fR value for \f(CW$^X\fR.
.SH AUTHOR
.IX Header "AUTHOR"
Nicholas Clark <nick@ccl4.org>, collating wisdom supplied by Slaven Rezic
and Tim Bunce.
.PP
Please report any errors, updates, or suggestions to
<https://github.com/Perl/perl5/issues>.