| CC: | jkeenan [...] cpan.org |
| Subject: | File::Temp, EXLOCK and nfs without lockd |
This issue was originally reported in the Perl 5 bug tracker as https://rt.perl.org/Ticket/Display.html?id=112520. Since File-Temp is "cpan upstream", I am moving the ticket here. -- jkeenan
##################################################
This is a bug report for perl from slaven@rezic.de,
generated with the help of perlbug 1.39 running under perl 5.14.2.
-----------------------------------------------------------------
File::Temp::tempfile sets EXLOCK => 1 by default if it is
supported, at least on all *BSD systems. Unfortunately the
existence of the O_EXLOCK flag does not mean that it is always
working. Especially it might not work if the directory
containing the temporary file is on an nfs mount, and there's
no lockd daemon running. The problem can be reproduced on a
FreeBSD system (/mnt/test is an nfs mount, perl either 5.8.9
or 5.14.2):
$ sudo /etc/rc.d/nfslocking stop
$ cd /mnt/test
$ env LC_ALL=C perl -MFile::Temp=tempfile -e 'my($tmpfh,$tmpfile) = tempfile("XXXXXXXX", EXLOCK=>1) or die $!'
Error in tempfile() using XXXXXXXX: Could not create temp file q_mcWOt9: Operation not supported at -e line 1
$ env LC_ALL=C perl -MFile::Temp=tempfile -e 'my($tmpfh,$tmpfile) = tempfile("XXXXXXXX", EXLOCK=>0) or die $!'
(no error)
As EXLOCK => 1 is not really mandatory (for example, it's
not available on Linux systems) I would suggest that in such
cases tempfile should not fail. Maybe the operation can be automatically
retried without using locking. Maybe the meaning of EXLOCK
could be changed like this:
1 means: use EXLOCK always,
0 means: use EXLOCK never,
undef or unspecified means: use EXLOCK if it exists and if it works.
See also https://rt.cpan.org/Ticket/Display.html?id=72291
where the current behavior is causing problems.
Regards,
Slaven
-----------------------------------------------------------------
---
Flags:
category=library
severity=low
module=File::Temp
---
Site configuration information for perl 5.14.2:
Configured by cpansand at Sun Apr 15 16:22:07 CEST 2012.
Summary of my perl5 (revision 5 version 14 subversion 2) configuration:
Commit id: dc281e6088d189558b79a5121119b7196c8b3db0
Platform:
osname=freebsd, osvers=8.0-release-p4, archname=i386-freebsd
uname='freebsd biokovo.herceg.de 8.0-release-p4 freebsd 8.0-release-p4 #0: mon jul 12 20:22:27 utc 2010 root@i386-builder.daemonology.net:usrobjusrsrcsysgeneric i386 '
config_args='-ds -e -Uversiononly -Dinstallusrbinperl=n -Dusedevel -Dprefix=/home/cpansand/var/ctps/5159_2/install/perl-v5.14.2'
hint=recommended, useposix=true, d_sigaction=define
useithreads=undef, usemultiplicity=undef
useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
use64bitint=undef, use64bitall=undef, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='cc', ccflags ='-DHAS_FPSETMASK -DHAS_FLOATINGPOINT_H -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include',
optimize='-O',
cppflags='-DHAS_FPSETMASK -DHAS_FLOATINGPOINT_H -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
ccversion='', gccversion='4.2.1 20070719 [FreeBSD]', gccosandvers=''
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
alignbytes=4, prototype=define
Linker and Libraries:
ld='cc', ldflags ='-Wl,-E -fstack-protector -L/usr/local/lib'
libpth=/usr/lib /usr/local/lib
libs=-lgdbm -lm -lcrypt -lutil -lc
perllibs=-lm -lcrypt -lutil -lc
libc=, so=so, useshrplib=false, libperl=libperl.a
gnulibc_version=''
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
cccdlflags='-DPIC -fPIC', lddlflags='-shared -L/usr/local/lib -fstack-protector'
Locally applied patches:
---
@INC for perl 5.14.2:
/home/cpansand/var/ctps/5159_2/install/perl-v5.14.2/lib/site_perl/5.14.2/i386-freebsd
/home/cpansand/var/ctps/5159_2/install/perl-v5.14.2/lib/site_perl/5.14.2
/home/cpansand/var/ctps/5159_2/install/perl-v5.14.2/lib/5.14.2/i386-freebsd
/home/cpansand/var/ctps/5159_2/install/perl-v5.14.2/lib/5.14.2
.
---
Environment for perl 5.14.2:
HOME=/home/e/eserte
LANG (unset)
LANGUAGE (unset)
LC_ALL=de_DE.ISO8859-1
LC_CTYPE=de_DE.ISO8859-1
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/usr/local/bin:/usr/X11R6/bin:/usr/X11/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/e/eserte/bin/freebsd8.0:/home/e/eserte/bin/sh:/home/e/eserte/bin:/usr/games:/home/e/eserte/devel
PERLDOC=-MPod::Perldoc::ToTextOverstrike
PERL_BADLANG (unset)
PERL_HTML_DISPLAY_CLASS=HTML::Display::Mozilla
SHELL=/bin/tcsh