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IPC::Open3 does not work as expected when fileno(STDERR) == 1 #10650

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p5pRT opened this issue Sep 21, 2010 · 3 comments
Open

IPC::Open3 does not work as expected when fileno(STDERR) == 1 #10650

p5pRT opened this issue Sep 21, 2010 · 3 comments
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distro-Linux type-library

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@p5pRT
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p5pRT commented Sep 21, 2010

Migrated from rt.perl.org#77966 (status was 'open')

Searchable as RT77966$
@p5pRT
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p5pRT commented Sep 21, 2010

From @salva

Created by @salva

When STDERR is attached to file descriptor 1, IPC​::Open3 fails to work as
expected.

The following command shows it​:

  perl -Ilib -MIPC​::Open2=open2 -E 'close STDERR; open STDERR, ">&=STDOUT" or
die; say fileno(STDERR); open2($in, $out, "echo hello")'

The output from the echo command should be send to the pipe created by open2 but
instead it goes to the screen.

Running it under strace shows that, in the child process, after the pipes have
been set up, the fh formerly attached to stderr (so formerly fd 1 that has been
already copied to another fd) is dupped over fd 1 instead of over fd 2

Cheers,

- Salva

Perl Info 

Flags:
    category=library
    severity=medium
    module=IPC::Open3

Site configuration information for perl 5.10.1:

Configured by Debian Project at Fri Apr 23 08:18:41 UTC 2010.

Summary of my perl5 (revision 5 version 10 subversion 1) configuration:
   
  Platform:
    osname=linux, osvers=2.6.24-27-server, 
archname=x86_64-linux-gnu-thread-multi
    uname='linux crested 2.6.24-27-server #1 smp fri mar 12 01:23:09 utc 2010 
x86_64 gnulinux '
    config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN 
-Dcccdlflags=-fPIC -Darchname=x86_64-linux-gnu -Dprefix=/usr 
-Dprivlib=/usr/share/perl/5.10 -Darchlib=/usr/lib/perl/5.10 -Dvendorprefix=/usr 
-Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local 
-Dsitelib=/usr/local/share/perl/5.10.1 -Dsitearch=/usr/local/lib/perl/5.10.1 
-Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 
-Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Dman1ext=1 
-Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Ud_ualarm 
-Uusesfio -Uusenm -DDEBUGGING=-g -Doptimize=-O2 -Duseshrplib 
-Dlibperl=libperl.so.5.10.1 -Dd_dosuid -des'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=define, usemultiplicity=define
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing 
-pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE 
-D_FILE_OFFSET_BITS=64',
    optimize='-O2 -g',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing -pipe 
-fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.4.3', gccosandvers=''
    intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', 
lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib /lib64 /usr/lib64
    libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
    perllibs=-ldl -lm -lpthread -lc -lcrypt
    libc=/lib/libc-2.11.1.so, so=so, useshrplib=true, libperl=libperl.so.5.10.1
    gnulibc_version='2.11.1'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -O2 -g -L/usr/local/lib 
-fstack-protector'

Locally applied patches:
    


@INC for perl 5.10.1:
    /etc/perl
    /usr/local/lib/perl/5.10.1
    /usr/local/share/perl/5.10.1
    /usr/lib/perl5
    /usr/share/perl5
    /usr/lib/perl/5.10
    /usr/share/perl/5.10
    /usr/local/lib/site_perl
    .


Environment for perl 5.10.1:
    HOME=/home/salva
    LANG=en_US.utf8
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
    PERL_BADLANG (unset)
    SHELL=/bin/bash

@p5pRT
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p5pRT commented Sep 22, 2010

From @ikegami

This is a specific case of RT#66224 or at least a related issue.

@p5pRT
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p5pRT commented Sep 22, 2010

The RT System itself - Status changed from 'new' to 'open'

@xenu xenu removed the affects-5.10 label Nov 19, 2021
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