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[perl #92728] pragma open handles STDERR improperly

Yunfeng Wang
June 13, 2011 17:13
[perl #92728] pragma open handles STDERR improperly
Message ID:
# New Ticket Created by  Yunfeng Wang 
# Please include the string:  [perl #92728]
# in the subject line of all future correspondence about this issue. 
# <URL: >

This is a bug report for perl from Yunfeng Wang <>,
generated with the help of perlbug 1.39 running under perl 5.12.3.


After the default PerlIO layer for STDIN/STDOUT/STDERR been set with
the :std subpragma, a second call to `use open ...' without :std will
undo the settings of STDIN and/or STDOUT, while leave STDERR untouched.
The expected behavior is to treat STDERR the same way as to STDOUT.

Example code:

1.  use open ':encoding(UTF-8)', ':std';
2.  # the I/O layer of STDIN/STDOUT/STDERR is set to :encoding(UTF-8)
3.  use open ':encoding(UTF-8)';
4.  # layer :encoding(UTF-8) is dropped for STDOUT, but not for STDERR

Here is a patch to fix this bug:

--- /usr/share/perl/5.12.3/      2011-05-20 03:02:33.000000000 +0800
+++     2011-06-13 19:03:59.000000000 +0800
@@ -100,11 +100,13 @@
        elsif ($type eq 'OUT') {
            _drop_oldenc(*STDOUT, @val);
+           _drop_oldenc(*STDERR, @val);
            $out = join(' ', @val);
        elsif ($type eq 'IO') {
            _drop_oldenc(*STDIN,  @val);
            _drop_oldenc(*STDOUT, @val);
+           _drop_oldenc(*STDERR, @val);
            $in = $out = join(' ', @val);
        else {

Site configuration information for perl 5.12.3:

Configured by Debian Project at Thu May 19 18:42:35 UTC 2011.

Summary of my perl5 (revision 5 version 12 subversion 3) configuration:
  Derived from:
    osname=linux, osvers=2.6.32-5-686,
    uname='linux callisto 2.6.32-5-686 #1 smp tue mar 8 21:36:00 utc
2011 i686 gnulinux '
    config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN
-Dcccdlflags=-fPIC -Darchname=i486-linux-gnu -Dprefix=/usr
-Dprivlib=/usr/share/perl/5.12 -Darchlib=/usr/lib/perl/5.12
-Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5
-Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local
-Dsitearch=/usr/local/lib/perl/5.12.3 -Dman1dir=/usr/share/man/man1
-Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1
-Dsiteman3dir=/usr/local/man/man3 -Duse64bitint -Dman1ext=1
-Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh
-Ud_ualarm -Uusesfio -Uusenm -Ui_libutil -DDEBUGGING=-g -Doptimize=-O2
-Dplibpth=/lib/i386-linux-gnu /usr/lib/i386-linux-gnu -Duseshrplib -des'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=define, usemultiplicity=define
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=define, use64bitall=undef, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
    cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN
-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include
    optimize='-O2 -g',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing
-pipe -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.6.1 20110507 (prerelease)', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=12345678
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long long', ivsize=8, nvtype='double', nvsize=8,
Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib /usr/lib64
    libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
    perllibs=-ldl -lm -lpthread -lc -lcrypt
    libc=/lib/, so=so, useshrplib=true,
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -O2 -g -L/usr/local/lib

Locally applied patches:
    DEBPKG:debian/arm_thread_stress_timeout - Raise the timeout of
ext/threads/shared/t/stress.t to accommodate slower build hosts
    DEBPKG:debian/cpan_config_path - Set location of CPAN::Config to
/etc/perl as /usr may not be writable.
    DEBPKG:debian/cpan_definstalldirs - Provide a sensible INSTALLDIRS
default for modules installed from CPAN.
    DEBPKG:debian/db_file_ver - Remove
overly restrictive DB_File version check.
    DEBPKG:debian/doc_info - Replace generic man(1) instructions with
Debian-specific information.
    DEBPKG:debian/enc2xs_inc - Tweak
enc2xs to follow symlinks and ignore missing @INC directories.
    DEBPKG:debian/errno_ver - Remove
Errno version check due to upgrade problems with long-running
    DEBPKG:debian/extutils_hacks - Various debian-specific ExtUtils changes
    DEBPKG:debian/fakeroot - Postpone LD_LIBRARY_PATH evaluation to
the binary targets.
    DEBPKG:debian/instmodsh_doc - Debian policy doesn't install
.packlist files for core or vendor.
    DEBPKG:debian/ld_run_path - Remove standard libs from LD_RUN_PATH
as per Debian policy.
    DEBPKG:debian/libnet_config_path - Set location of libnet.cfg to
/etc/perl/Net as /usr may not be writable.
    DEBPKG:debian/m68k_thread_stress -
Disable some threads tests on m68k for now due to missing TLS.
    DEBPKG:debian/mod_paths - Tweak @INC ordering for Debian
    DEBPKG:debian/module_build_man_extensions - Adjust Module::Build manual page
extensions for the Debian Perl policy
    DEBPKG:debian/prune_libs - Prune the
list of libraries wanted to what we actually need.
    DEBPKG:fixes/net_smtp_docs -
[ #36038] Document the Net::SMTP 'Port' option
    DEBPKG:fixes/processPL -
[ #17224] Always use PERLRUNINST when building perl
    DEBPKG:debian/perlivp - Make perlivp
skip include directories in /usr/local
    DEBPKG:debian/disable-zlib-bundling - Disable zlib bundling in
    DEBPKG:debian/cpanplus_definstalldirs - Configure CPANPLUS to use the site
directories by default.
    DEBPKG:debian/cpanplus_config_path - Save local versions of
CPANPLUS::Config::System into /etc/perl.
    DEBPKG:fixes/autodie-flock - Allow
for flock returning EAGAIN instead of EWOULDBLOCK on linux/parisc
    DEBPKG:debian/devel-ppport-ia64-optim - Work around an ICE on ia64
    DEBPKG:fixes/cpanplus-without-home -
[ #52988] Fix CPANPLUS test failures when HOME doesn't
    DEBPKG:debian/arm_optim - Downgrade
the optimization of sv.c on arm due to a gcc-4.4 bug
    DEBPKG:debian/deprecate-with-apt -
Point users to Debian packages of deprecated core modules
    DEBPKG:fixes/hurd-ccflags - Make
hints/ append to $ccflags rather than overriding them
    DEBPKG:debian/squelch-locale-warnings - Squelch locale warnings in Debian
package maintainer scripts
    DEBPKG:fixes/lc-numeric-docs - [perl
#78452] [903eb63] LC_NUMERIC documentation fixes
    DEBPKG:fixes/lc-numeric-sprintf -
[perl #78632] [b3fd614] Fix sprintf not to ignore LC_NUMERIC with
    DEBPKG:fixes/concat-stack-corruption - [perl #78674] [e3393f5] Fix stack
pointer corruption in pp_concat() with 'use encoding'
    DEBPKG:fixes/h2ph-gcc-4.5 -
[8d66b3f] h2ph fix for gcc 4.5
    DEBPKG:fixes/casing-taint-cve-2011-1487 - [perl #87336] fix unwanted taint
laundering in lc(), uc() et al.
    DEBPKG:fixes/correct-module-corelist-version - [a0a0e54] Correct
the version of Module::CoreList that was released with v5.12.3
    DEBPKG:fixes/module-build-home-directory - [ #67893] Fix failing tilde
test when run under a UID without a passwd entry
    DEBPKG:patchlevel - List packaged
patches for 5.12.3-7 in patchlevel.h

@INC for perl 5.12.3:

Environment for perl 5.12.3:
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PERL_BADLANG (unset)
    SHELL=/bin/bash Perl Programming lists via nntp and http.
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