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IO::Select->select() returns empty list even if there were no errors #13523

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p5pRT opened this issue Jan 13, 2014 · 11 comments
Closed

IO::Select->select() returns empty list even if there were no errors #13523

p5pRT opened this issue Jan 13, 2014 · 11 comments

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@p5pRT
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@p5pRT p5pRT commented Jan 13, 2014

Migrated from rt.perl.org#120982 (status was 'resolved')

Searchable as RT120982$

@p5pRT
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@p5pRT p5pRT commented Jan 13, 2014

From verdrehung@gmail.com

From IO​::Select->select documentation​: "Upon error an empty list is
returned."
But in fact it returns empty list if select() return value was <= 0. See
https://metacpan.org/source/GBARR/IO-1.25/lib/IO/Select.pm#L191
So if select() returns 0 (0 file handles ready) IO​::Select determines this
as error and returns empty list and IO​::Select user can't distinguish error
from the fact that there is no ready file handles yet.

Perl Info

Flags:
    category=library
    severity=high
    module=IO::Select

Site configuration information for perl 5.18.1:

Configured by Debian Project at Wed Sep 11 23:11:04 UTC 2013.

Summary of my perl5 (revision 5 version 18 subversion 1) configuration:

  Platform:
    osname=linux, osvers=3.2.0-4-686-pae,
archname=i486-linux-gnu-thread-multi-64int
    uname='linux callisto 3.2.0-4-686-pae #1 smp debian 3.2.46-1+deb7u1
i686 gnulinux '
    config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN
-D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector --param=ssp-buffer-size=4
-Wformat -Werror=format-security -Dldflags= -Wl,-z,relro
-Dlddlflags=-shared -Wl,-z,relro -Dcccdlflags=-fPIC
-Darchname=i486-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.18
-Darchlib=/usr/lib/perl/5.18 -Dvendorprefix=/usr
-Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5
-Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.18.1
-Dsitearch=/usr/local/lib/perl/5.18.1 -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 -Uversiononly -DDEBUGGING=-g -Doptimize=-O2 -Duseshrplib
-Dlibperl=libperl.so.5.18.1 -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
  Compiler:
    cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN
-fstack-protector -fno-strict-aliasing -pipe -I/usr/local/include
-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2 -g',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fstack-protector
-fno-strict-aliasing -pipe -I/usr/local/include'
    ccversion='', gccversion='4.8.1', 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/i386-linux-gnu /lib/../lib
/usr/lib/i386-linux-gnu /usr/lib/../lib /lib /usr/lib
    libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
    perllibs=-ldl -lm -lpthread -lc -lcrypt
    libc=, so=so, useshrplib=true, libperl=libperl.so.5.18.1
    gnulibc_version='2.17'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib
-fstack-protector'

Locally applied patches:
    DEBPKG:debian/cpan_definstalldirs - Provide a sensible INSTALLDIRS
default for modules installed from CPAN.
    DEBPKG:debian/db_file_ver - http://bugs.debian.org/340047 Remove overly
restrictive DB_File version check.
    DEBPKG:debian/doc_info - Replace generic man(1) instructions with
Debian-specific information.
    DEBPKG:debian/enc2xs_inc - http://bugs.debian.org/290336 Tweak enc2xs
to follow symlinks and ignore missing @INC directories.
    DEBPKG:debian/errno_ver - http://bugs.debian.org/343351 Remove Errno
version check due to upgrade problems with long-running processes.
    DEBPKG:debian/libperl_embed_doc - http://bugs.debian.org/186778 Note
that libperl-dev package is required for embedded linking
    DEBPKG:fixes/respect_umask - Respect umask during installation
    DEBPKG:debian/writable_site_dirs - Set umask approproately for site
install directories
    DEBPKG:debian/extutils_set_libperl_path - EU:MM: Set location of
libperl.a to /usr/lib
    DEBPKG:debian/no_packlist_perllocal - Don't install .packlist or
perllocal.pod for perl or vendor
    DEBPKG:debian/prefix_changes - Fiddle with *PREFIX and variables
written to the makefile
    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/mod_paths - Tweak @INC ordering for Debian
    DEBPKG:debian/module_build_man_extensions -
http://bugs.debian.org/479460 Adjust Module::Build manual page extensions
for the Debian Perl policy
    DEBPKG:debian/prune_libs - http://bugs.debian.org/128355 Prune the list
of libraries wanted to what we actually need.
    DEBPKG:fixes/net_smtp_docs - [rt.cpan.org #36038]
http://bugs.debian.org/100195 Document the Net::SMTP 'Port' option
    DEBPKG:debian/perlivp - http://bugs.debian.org/510895 Make perlivp skip
include directories in /usr/local
    DEBPKG:debian/cpanplus_definstalldirs -
http://bugs.debian.org/533707Configure CPANPLUS to use the site
directories by default.
    DEBPKG:debian/cpanplus_config_path - Save local versions of
CPANPLUS::Config::System into /etc/perl.
    DEBPKG:debian/deprecate-with-apt - http://bugs.debian.org/702096 Point
users to Debian packages of deprecated core modules
    DEBPKG:debian/squelch-locale-warnings -
http://bugs.debian.org/508764Squelch locale warnings in Debian package
maintainer scripts
    DEBPKG:debian/skip-upstream-git-tests - Skip tests specific to the
upstream Git repository
    DEBPKG:debian/patchlevel - http://bugs.debian.org/567489 List packaged
patches for 5.18.1-4 in patchlevel.h
    DEBPKG:debian/skip-kfreebsd-crash - http://bugs.debian.org/628493 [perl
#96272] Skip a crashing test case in t/op/threads.t on GNU/kFreeBSD
    DEBPKG:fixes/document_makemaker_ccflags - http://bugs.debian.org/628522[
rt.cpan.org #68613] Document that CCFLAGS should include $Config{ccflags}
    DEBPKG:debian/find_html2text - http://bugs.debian.org/640479 Configure
CPAN::Distribution with correct name of html2text
    DEBPKG:debian/hurd_test_todo_syslog -
http://bugs.debian.org/650093Disable failing GNU/Hurd tests in
cpan/Sys-Syslog/t/syslog.t
    DEBPKG:debian/hurd_test_skip_sigdispatch -
http://bugs.debian.org/650188Disable failing GNU/Hurd tests
op/sigdispatch.t
    DEBPKG:debian/hurd_test_skip_stack -
http://bugs.debian.org/650175Disable failing GNU/Hurd tests
dist/threads/t/stack.t
    DEBPKG:debian/hurd_test_skip_pipe -
http://bugs.debian.org/650187Disable failing GNU/Hurd tests io/pipe.t
    DEBPKG:debian/hurd_test_skip_io_pipe -
http://bugs.debian.org/650096Disable failing GNU/Hurd tests
dist/IO/t/io_pipe.t
    DEBPKG:fixes/manpage_name_Test-Harness - http://bugs.debian.org/650451 [
rt.cpan.org #73399] cpan/Test-Harness: add NAME headings in modules with POD
    DEBPKG:debian/makemaker-pasthru - http://bugs.debian.org/660195 [
rt.cpan.org #28632] Make EU::MM pass LD through to recursive Makefile.PL
invocations
    DEBPKG:debian/perl5db-x-terminal-emulator.patch -
http://bugs.debian.org/668490 Invoke x-terminal-emulator rather than xterm
in perl5db.pl
    DEBPKG:debian/cpan-missing-site-dirs -
http://bugs.debian.org/688842Fix CPAN::FirstTime defaults with
nonexisting site dirs if a parent is
writable
    DEBPKG:debian/hurd_net_ping_disable_test -
http://bugs.debian.org/709385Disable failing Net-Ping tests for
GNU/Hurd
    DEBPKG:fixes/memoize_storable_nstore - [rt.cpan.org #77790]
http://bugs.debian.org/587650 Memoize::Storable: respect 'nstore' option
not respected
    DEBPKG:fixes/net_ftp_failed_command - [rt.cpan.org #37700]
http://bugs.debian.org/491062 Net::FTP: cope gracefully with a failed
command
    DEBPKG:fixes/perlbug-patchlist - [3541c11]
http://bugs.debian.org/710842[perl #118433] Make perlbug look up the
list of local patches at run time
    DEBPKG:fixes/regexp-preserve - http://bugs.debian.org/718209 [perl
#118213] [f4194b2] RT #118213: handle $r=qr/.../; /$r/p properly
    DEBPKG:fixes/regexp-preserve-testcases -
http://bugs.debian.org/718209[perl #118213] [4d7b2f5] Disable new //p
tests
    DEBPKG:fixes/module_metadata_security_doc - [68cdd4b] CVE-2013-1437
documentation fix
    DEBPKG:fixes/module_metadata_taint_fix - [bff978f]
http://bugs.debian.org/722210 [rt.cpan.org #88576] untaint version, if
needed, in Module::Metadata


@INC for perl 5.18.1:
    /etc/perl
    /usr/local/lib/perl/5.18.1
    /usr/local/share/perl/5.18.1
    /usr/lib/perl5
    /usr/share/perl5
    /usr/lib/perl/5.18
    /usr/share/perl/5.18
    /usr/local/lib/site_perl
    .


Environment for perl 5.18.1:
    HOME=/home/oleg
    LANG=ru_RU.UTF-8
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
    PERL_BADLANG (unset)
    SHELL=/bin/bash

@p5pRT
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@p5pRT p5pRT commented Jan 14, 2014

From @jkeenan

Trimming this report so that it will show up in the rt.perl.org GUI.

On Mon Jan 13 04​:31​:58 2014, verdrehung@​gmail.com wrote​:

This is a bug report for perl from oleg<>cpan.org,
generated with the help of perlbug 1.39 running under perl 5.18.1.

-----------------------------------------------------------------
[Please describe your issue here]
From IO​::Select->select documentation​: "Upon error an empty list is
returned."
But in fact it returns empty list if select() return value was <= 0. See
https://metacpan.org/source/GBARR/IO-1.25/lib/IO/Select.pm#L191
So if select() returns 0 (0 file handles ready) IO​::Select determines this
as error and returns empty list and IO​::Select user can't distinguish error
from the fact that there is no ready file handles yet.

@p5pRT
Copy link
Author

@p5pRT p5pRT commented Jan 14, 2014

From [Unknown Contact. See original ticket]

Trimming this report so that it will show up in the rt.perl.org GUI.

On Mon Jan 13 04​:31​:58 2014, verdrehung@​gmail.com wrote​:

This is a bug report for perl from oleg<>cpan.org,
generated with the help of perlbug 1.39 running under perl 5.18.1.

-----------------------------------------------------------------
[Please describe your issue here]
From IO​::Select->select documentation​: "Upon error an empty list is
returned."
But in fact it returns empty list if select() return value was <= 0. See
https://metacpan.org/source/GBARR/IO-1.25/lib/IO/Select.pm#L191
So if select() returns 0 (0 file handles ready) IO​::Select determines this
as error and returns empty list and IO​::Select user can't distinguish error
from the fact that there is no ready file handles yet.

@p5pRT
Copy link
Author

@p5pRT p5pRT commented Jan 14, 2014

From victor@vsespb.ru

duplicate https://rt.cpan.org/Public/Bug/Display.html?id=90091

there are 35 open issues on CPAN RT btw.

2014/1/13 Ð�лег Ð� <perlbug-followup@​perl.org>​:

# New Ticket Created by �лег �
# Please include the string​: [perl #120982]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl5/Ticket/Display.html?id=120982 >

This is a bug report for perl from oleg<>cpan.org,
generated with the help of perlbug 1.39 running under perl 5.18.1.

-----------------------------------------------------------------
[Please describe your issue here]

From IO​::Select->select documentation​: "Upon error an empty list is
returned."
But in fact it returns empty list if select() return value was <= 0. See
https://metacpan.org/source/GBARR/IO-1.25/lib/IO/Select.pm#L191
So if select() returns 0 (0 file handles ready) IO​::Select determines this
as error and returns empty list and IO​::Select user can't distinguish error
from the fact that there is no ready file handles yet.

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags​:
category=library
severity=high
module=IO​::Select
---
Site configuration information for perl 5.18.1​:

Configured by Debian Project at Wed Sep 11 23​:11​:04 UTC 2013.

Summary of my perl5 (revision 5 version 18 subversion 1) configuration​:

Platform​:
osname=linux, osvers=3.2.0-4-686-pae,
archname=i486-linux-gnu-thread-multi-64int
uname='linux callisto 3.2.0-4-686-pae #1 smp debian 3.2.46-1+deb7u1
i686 gnulinux '
config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN
-D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector --param=ssp-buffer-size=4
-Wformat -Werror=format-security -Dldflags= -Wl,-z,relro
-Dlddlflags=-shared -Wl,-z,relro -Dcccdlflags=-fPIC
-Darchname=i486-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.18
-Darchlib=/usr/lib/perl/5.18 -Dvendorprefix=/usr
-Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5
-Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.18.1
-Dsitearch=/usr/local/lib/perl/5.18.1 -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 -Uversiononly -DDEBUGGING=-g -Doptimize=-O2 -Duseshrplib
-Dlibperl=libperl.so.5.18.1 -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
Compiler​:
cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN
-fstack-protector -fno-strict-aliasing -pipe -I/usr/local/include
-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
optimize='-O2 -g',
cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fstack-protector
-fno-strict-aliasing -pipe -I/usr/local/include'
ccversion='', gccversion='4.8.1', 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/i386-linux-gnu /lib/../lib
/usr/lib/i386-linux-gnu /usr/lib/../lib /lib /usr/lib
libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
perllibs=-ldl -lm -lpthread -lc -lcrypt
libc=, so=so, useshrplib=true, libperl=libperl.so.5.18.1
gnulibc_version='2.17'
Dynamic Linking​:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib
-fstack-protector'

Locally applied patches​:
DEBPKG​:debian/cpan_definstalldirs - Provide a sensible INSTALLDIRS
default for modules installed from CPAN.
DEBPKG​:debian/db_file_ver - http​://bugs.debian.org/340047 Remove overly
restrictive DB_File version check.
DEBPKG​:debian/doc_info - Replace generic man(1) instructions with
Debian-specific information.
DEBPKG​:debian/enc2xs_inc - http​://bugs.debian.org/290336 Tweak enc2xs
to follow symlinks and ignore missing @​INC directories.
DEBPKG​:debian/errno_ver - http​://bugs.debian.org/343351 Remove Errno
version check due to upgrade problems with long-running processes.
DEBPKG​:debian/libperl_embed_doc - http​://bugs.debian.org/186778 Note
that libperl-dev package is required for embedded linking
DEBPKG​:fixes/respect_umask - Respect umask during installation
DEBPKG​:debian/writable_site_dirs - Set umask approproately for site
install directories
DEBPKG​:debian/extutils_set_libperl_path - EU​:MM​: Set location of
libperl.a to /usr/lib
DEBPKG​:debian/no_packlist_perllocal - Don't install .packlist or
perllocal.pod for perl or vendor
DEBPKG​:debian/prefix_changes - Fiddle with *PREFIX and variables
written to the makefile
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/mod_paths - Tweak @​INC ordering for Debian
DEBPKG​:debian/module_build_man_extensions -
http​://bugs.debian.org/479460 Adjust Module​::Build manual page extensions
for the Debian Perl policy
DEBPKG​:debian/prune_libs - http​://bugs.debian.org/128355 Prune the list
of libraries wanted to what we actually need.
DEBPKG​:fixes/net_smtp_docs - [rt.cpan.org #36038]
http​://bugs.debian.org/100195 Document the Net​::SMTP 'Port' option
DEBPKG​:debian/perlivp - http​://bugs.debian.org/510895 Make perlivp skip
include directories in /usr/local
DEBPKG​:debian/cpanplus_definstalldirs -
http​://bugs.debian.org/533707Configure CPANPLUS to use the site
directories by default.
DEBPKG​:debian/cpanplus_config_path - Save local versions of
CPANPLUS​::Config​::System into /etc/perl.
DEBPKG​:debian/deprecate-with-apt - http​://bugs.debian.org/702096 Point
users to Debian packages of deprecated core modules
DEBPKG​:debian/squelch-locale-warnings -
http​://bugs.debian.org/508764Squelch locale warnings in Debian package
maintainer scripts
DEBPKG​:debian/skip-upstream-git-tests - Skip tests specific to the
upstream Git repository
DEBPKG​:debian/patchlevel - http​://bugs.debian.org/567489 List packaged
patches for 5.18.1-4 in patchlevel.h
DEBPKG​:debian/skip-kfreebsd-crash - http​://bugs.debian.org/628493 [perl
#96272] Skip a crashing test case in t/op/threads.t on GNU/kFreeBSD
DEBPKG​:fixes/document_makemaker_ccflags - http​://bugs.debian.org/628522[
rt.cpan.org #68613] Document that CCFLAGS should include $Config{ccflags}
DEBPKG​:debian/find_html2text - http​://bugs.debian.org/640479 Configure
CPAN​::Distribution with correct name of html2text
DEBPKG​:debian/hurd_test_todo_syslog -
http​://bugs.debian.org/650093Disable failing GNU/Hurd tests in
cpan/Sys-Syslog/t/syslog.t
DEBPKG​:debian/hurd_test_skip_sigdispatch -
http​://bugs.debian.org/650188Disable failing GNU/Hurd tests
op/sigdispatch.t
DEBPKG​:debian/hurd_test_skip_stack -
http​://bugs.debian.org/650175Disable failing GNU/Hurd tests
dist/threads/t/stack.t
DEBPKG​:debian/hurd_test_skip_pipe -
http​://bugs.debian.org/650187Disable failing GNU/Hurd tests io/pipe.t
DEBPKG​:debian/hurd_test_skip_io_pipe -
http​://bugs.debian.org/650096Disable failing GNU/Hurd tests
dist/IO/t/io_pipe.t
DEBPKG​:fixes/manpage_name_Test-Harness - http​://bugs.debian.org/650451 [
rt.cpan.org #73399] cpan/Test-Harness​: add NAME headings in modules with POD
DEBPKG​:debian/makemaker-pasthru - http​://bugs.debian.org/660195 [
rt.cpan.org #28632] Make EU​::MM pass LD through to recursive Makefile.PL
invocations
DEBPKG​:debian/perl5db-x-terminal-emulator.patch -
http​://bugs.debian.org/668490 Invoke x-terminal-emulator rather than xterm
in perl5db.pl
DEBPKG​:debian/cpan-missing-site-dirs -
http​://bugs.debian.org/688842Fix CPAN​::FirstTime defaults with
nonexisting site dirs if a parent is
writable
DEBPKG​:debian/hurd_net_ping_disable_test -
http​://bugs.debian.org/709385Disable failing Net-Ping tests for
GNU/Hurd
DEBPKG​:fixes/memoize_storable_nstore - [rt.cpan.org #77790]
http​://bugs.debian.org/587650 Memoize​::Storable​: respect 'nstore' option
not respected
DEBPKG​:fixes/net_ftp_failed_command - [rt.cpan.org #37700]
http​://bugs.debian.org/491062 Net​::FTP​: cope gracefully with a failed
command
DEBPKG​:fixes/perlbug-patchlist - [3541c11]
http​://bugs.debian.org/710842[perl #118433] Make perlbug look up the
list of local patches at run time
DEBPKG​:fixes/regexp-preserve - http​://bugs.debian.org/718209 [perl
#118213] [f4194b2] RT #118213​: handle $r=qr/.../; /$r/p properly
DEBPKG​:fixes/regexp-preserve-testcases -
http​://bugs.debian.org/718209[perl #118213] [4d7b2f5] Disable new //p
tests
DEBPKG​:fixes/module_metadata_security_doc - [68cdd4b] CVE-2013-1437
documentation fix
DEBPKG​:fixes/module_metadata_taint_fix - [bff978f]
http​://bugs.debian.org/722210 [rt.cpan.org #88576] untaint version, if
needed, in Module​::Metadata

---
@​INC for perl 5.18.1​:
/etc/perl
/usr/local/lib/perl/5.18.1
/usr/local/share/perl/5.18.1
/usr/lib/perl5
/usr/share/perl5
/usr/lib/perl/5.18
/usr/share/perl/5.18
/usr/local/lib/site_perl
.

---
Environment for perl 5.18.1​:
HOME=/home/oleg
LANG=ru_RU.UTF-8
LANGUAGE (unset)
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/usr/local/bin​:/usr/bin​:/bin​:/usr/local/games​:/usr/games
PERL_BADLANG (unset)
SHELL=/bin/bash

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@p5pRT p5pRT commented Jan 14, 2014

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

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@p5pRT p5pRT commented Jan 14, 2014

From verdrehung@gmail.com

Documentation says that it is currently maintained by the Perl Porters
and should be reported here.
So, maybe we'll get some response

2014/1/15 Victor Efimov via RT <perlbug-followup@​perl.org>​:

duplicate https://rt.cpan.org/Public/Bug/Display.html?id=90091

there are 35 open issues on CPAN RT btw.

2014/1/13 Ð�лег Ð� <perlbug-followup@​perl.org>​:

# New Ticket Created by �лег �
# Please include the string​: [perl #120982]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl5/Ticket/Display.html?id=120982 >

This is a bug report for perl from oleg<>cpan.org,
generated with the help of perlbug 1.39 running under perl 5.18.1.

-----------------------------------------------------------------
[Please describe your issue here]

From IO​::Select->select documentation​: "Upon error an empty list is
returned."
But in fact it returns empty list if select() return value was <= 0. See
https://metacpan.org/source/GBARR/IO-1.25/lib/IO/Select.pm#L191
So if select() returns 0 (0 file handles ready) IO​::Select determines this
as error and returns empty list and IO​::Select user can't distinguish error
from the fact that there is no ready file handles yet.

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags​:
category=library
severity=high
module=IO​::Select
---
Site configuration information for perl 5.18.1​:

Configured by Debian Project at Wed Sep 11 23​:11​:04 UTC 2013.

Summary of my perl5 (revision 5 version 18 subversion 1) configuration​:

Platform​:
osname=linux, osvers=3.2.0-4-686-pae,
archname=i486-linux-gnu-thread-multi-64int
uname='linux callisto 3.2.0-4-686-pae #1 smp debian 3.2.46-1+deb7u1
i686 gnulinux '
config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN
-D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector --param=ssp-buffer-size=4
-Wformat -Werror=format-security -Dldflags= -Wl,-z,relro
-Dlddlflags=-shared -Wl,-z,relro -Dcccdlflags=-fPIC
-Darchname=i486-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.18
-Darchlib=/usr/lib/perl/5.18 -Dvendorprefix=/usr
-Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5
-Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.18.1
-Dsitearch=/usr/local/lib/perl/5.18.1 -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 -Uversiononly -DDEBUGGING=-g -Doptimize=-O2 -Duseshrplib
-Dlibperl=libperl.so.5.18.1 -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
Compiler​:
cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN
-fstack-protector -fno-strict-aliasing -pipe -I/usr/local/include
-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
optimize='-O2 -g',
cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fstack-protector
-fno-strict-aliasing -pipe -I/usr/local/include'
ccversion='', gccversion='4.8.1', 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/i386-linux-gnu /lib/../lib
/usr/lib/i386-linux-gnu /usr/lib/../lib /lib /usr/lib
libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
perllibs=-ldl -lm -lpthread -lc -lcrypt
libc=, so=so, useshrplib=true, libperl=libperl.so.5.18.1
gnulibc_version='2.17'
Dynamic Linking​:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib
-fstack-protector'

Locally applied patches​:
DEBPKG​:debian/cpan_definstalldirs - Provide a sensible INSTALLDIRS
default for modules installed from CPAN.
DEBPKG​:debian/db_file_ver - http​://bugs.debian.org/340047 Remove overly
restrictive DB_File version check.
DEBPKG​:debian/doc_info - Replace generic man(1) instructions with
Debian-specific information.
DEBPKG​:debian/enc2xs_inc - http​://bugs.debian.org/290336 Tweak enc2xs
to follow symlinks and ignore missing @​INC directories.
DEBPKG​:debian/errno_ver - http​://bugs.debian.org/343351 Remove Errno
version check due to upgrade problems with long-running processes.
DEBPKG​:debian/libperl_embed_doc - http​://bugs.debian.org/186778 Note
that libperl-dev package is required for embedded linking
DEBPKG​:fixes/respect_umask - Respect umask during installation
DEBPKG​:debian/writable_site_dirs - Set umask approproately for site
install directories
DEBPKG​:debian/extutils_set_libperl_path - EU​:MM​: Set location of
libperl.a to /usr/lib
DEBPKG​:debian/no_packlist_perllocal - Don't install .packlist or
perllocal.pod for perl or vendor
DEBPKG​:debian/prefix_changes - Fiddle with *PREFIX and variables
written to the makefile
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/mod_paths - Tweak @​INC ordering for Debian
DEBPKG​:debian/module_build_man_extensions -
http​://bugs.debian.org/479460 Adjust Module​::Build manual page extensions
for the Debian Perl policy
DEBPKG​:debian/prune_libs - http​://bugs.debian.org/128355 Prune the list
of libraries wanted to what we actually need.
DEBPKG​:fixes/net_smtp_docs - [rt.cpan.org #36038]
http​://bugs.debian.org/100195 Document the Net​::SMTP 'Port' option
DEBPKG​:debian/perlivp - http​://bugs.debian.org/510895 Make perlivp skip
include directories in /usr/local
DEBPKG​:debian/cpanplus_definstalldirs -
http​://bugs.debian.org/533707Configure CPANPLUS to use the site
directories by default.
DEBPKG​:debian/cpanplus_config_path - Save local versions of
CPANPLUS​::Config​::System into /etc/perl.
DEBPKG​:debian/deprecate-with-apt - http​://bugs.debian.org/702096 Point
users to Debian packages of deprecated core modules
DEBPKG​:debian/squelch-locale-warnings -
http​://bugs.debian.org/508764Squelch locale warnings in Debian package
maintainer scripts
DEBPKG​:debian/skip-upstream-git-tests - Skip tests specific to the
upstream Git repository
DEBPKG​:debian/patchlevel - http​://bugs.debian.org/567489 List packaged
patches for 5.18.1-4 in patchlevel.h
DEBPKG​:debian/skip-kfreebsd-crash - http​://bugs.debian.org/628493 [perl
#96272] Skip a crashing test case in t/op/threads.t on GNU/kFreeBSD
DEBPKG​:fixes/document_makemaker_ccflags - http​://bugs.debian.org/628522[
rt.cpan.org #68613] Document that CCFLAGS should include $Config{ccflags}
DEBPKG​:debian/find_html2text - http​://bugs.debian.org/640479 Configure
CPAN​::Distribution with correct name of html2text
DEBPKG​:debian/hurd_test_todo_syslog -
http​://bugs.debian.org/650093Disable failing GNU/Hurd tests in
cpan/Sys-Syslog/t/syslog.t
DEBPKG​:debian/hurd_test_skip_sigdispatch -
http​://bugs.debian.org/650188Disable failing GNU/Hurd tests
op/sigdispatch.t
DEBPKG​:debian/hurd_test_skip_stack -
http​://bugs.debian.org/650175Disable failing GNU/Hurd tests
dist/threads/t/stack.t
DEBPKG​:debian/hurd_test_skip_pipe -
http​://bugs.debian.org/650187Disable failing GNU/Hurd tests io/pipe.t
DEBPKG​:debian/hurd_test_skip_io_pipe -
http​://bugs.debian.org/650096Disable failing GNU/Hurd tests
dist/IO/t/io_pipe.t
DEBPKG​:fixes/manpage_name_Test-Harness - http​://bugs.debian.org/650451 [
rt.cpan.org #73399] cpan/Test-Harness​: add NAME headings in modules with POD
DEBPKG​:debian/makemaker-pasthru - http​://bugs.debian.org/660195 [
rt.cpan.org #28632] Make EU​::MM pass LD through to recursive Makefile.PL
invocations
DEBPKG​:debian/perl5db-x-terminal-emulator.patch -
http​://bugs.debian.org/668490 Invoke x-terminal-emulator rather than xterm
in perl5db.pl
DEBPKG​:debian/cpan-missing-site-dirs -
http​://bugs.debian.org/688842Fix CPAN​::FirstTime defaults with
nonexisting site dirs if a parent is
writable
DEBPKG​:debian/hurd_net_ping_disable_test -
http​://bugs.debian.org/709385Disable failing Net-Ping tests for
GNU/Hurd
DEBPKG​:fixes/memoize_storable_nstore - [rt.cpan.org #77790]
http​://bugs.debian.org/587650 Memoize​::Storable​: respect 'nstore' option
not respected
DEBPKG​:fixes/net_ftp_failed_command - [rt.cpan.org #37700]
http​://bugs.debian.org/491062 Net​::FTP​: cope gracefully with a failed
command
DEBPKG​:fixes/perlbug-patchlist - [3541c11]
http​://bugs.debian.org/710842[perl #118433] Make perlbug look up the
list of local patches at run time
DEBPKG​:fixes/regexp-preserve - http​://bugs.debian.org/718209 [perl
#118213] [f4194b2] RT #118213​: handle $r=qr/.../; /$r/p properly
DEBPKG​:fixes/regexp-preserve-testcases -
http​://bugs.debian.org/718209[perl #118213] [4d7b2f5] Disable new //p
tests
DEBPKG​:fixes/module_metadata_security_doc - [68cdd4b] CVE-2013-1437
documentation fix
DEBPKG​:fixes/module_metadata_taint_fix - [bff978f]
http​://bugs.debian.org/722210 [rt.cpan.org #88576] untaint version, if
needed, in Module​::Metadata

---
@​INC for perl 5.18.1​:
/etc/perl
/usr/local/lib/perl/5.18.1
/usr/local/share/perl/5.18.1
/usr/lib/perl5
/usr/share/perl5
/usr/lib/perl/5.18
/usr/share/perl/5.18
/usr/local/lib/site_perl
.

---
Environment for perl 5.18.1​:
HOME=/home/oleg
LANG=ru_RU.UTF-8
LANGUAGE (unset)
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/usr/local/bin​:/usr/bin​:/bin​:/usr/local/games​:/usr/games
PERL_BADLANG (unset)
SHELL=/bin/bash

@p5pRT
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@p5pRT p5pRT commented Jan 14, 2014

From @Leont

On Mon Jan 13 04​:31​:58 2014, verdrehung@​gmail.com wrote​:

From IO​::Select->select documentation​: "Upon error an empty list is
returned."
But in fact it returns empty list if select() return value was <= 0. See
https://metacpan.org/source/GBARR/IO-1.25/lib/IO/Select.pm#L191
So if select() returns 0 (0 file handles ready) IO​::Select determines this
as error and returns empty list and IO​::Select user can't distinguish error
from the fact that there is no ready file handles yet.

This is an unfortunate interface, but I suspect given
backwards-compatibility we can't really change that anymore; though one
could argue it could return ([], [], []) if select(�) == 0. Depending on
your needs my advice may be to use something more sensible anyway.

Leon

@p5pRT
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@p5pRT p5pRT commented Jan 15, 2014

From victor@vsespb.ru

at least docs should be changed.

2014/1/15 Leon Timmermans <fawaka@​gmail.com>​:

On Mon Jan 13 04​:31​:58 2014, verdrehung@​gmail.com wrote​:

From IO​::Select->select documentation​: "Upon error an empty list is
returned."
But in fact it returns empty list if select() return value was <= 0. See
https://metacpan.org/source/GBARR/IO-1.25/lib/IO/Select.pm#L191
So if select() returns 0 (0 file handles ready) IO​::Select determines this
as error and returns empty list and IO​::Select user can't distinguish
error
from the fact that there is no ready file handles yet.

This is an unfortunate interface, but I suspect given
backwards-compatibility we can't really change that anymore; though one
could argue it could return ([], [], []) if select(�) == 0. Depending on
your needs my advice may be to use something more sensible anyway.

Leon

@p5pRT
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@p5pRT p5pRT commented Jan 17, 2014

From victor@vsespb.ru

or maybe introduce new global var in IO​::Select namespace which will
hold the real return value of select/can_XXX

2014/1/15 Victor Efimov <victor@​vsespb.ru>​:

at least docs should be changed.

2014/1/15 Leon Timmermans <fawaka@​gmail.com>​:

On Mon Jan 13 04​:31​:58 2014, verdrehung@​gmail.com wrote​:

From IO​::Select->select documentation​: "Upon error an empty list is
returned."
But in fact it returns empty list if select() return value was <= 0. See
https://metacpan.org/source/GBARR/IO-1.25/lib/IO/Select.pm#L191
So if select() returns 0 (0 file handles ready) IO​::Select determines this
as error and returns empty list and IO​::Select user can't distinguish
error
from the fact that there is no ready file handles yet.

This is an unfortunate interface, but I suspect given
backwards-compatibility we can't really change that anymore; though one
could argue it could return ([], [], []) if select(�) == 0. Depending on
your needs my advice may be to use something more sensible anyway.

Leon

@p5pRT
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@p5pRT p5pRT commented Dec 16, 2017

From zefram@fysh.org

Oleg G wrote​:

So if select() returns 0 (0 file handles ready) IO​::Select determines this
as error and returns empty list and IO​::Select user can't distinguish error
from the fact that there is no ready file handles yet.

Actually they can be distinguished by use of $!. The
documentation was recently extended to describe this in commit
bc33310. This ticket can be closed.

-zefram

@p5pRT
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@p5pRT p5pRT commented Dec 18, 2017

@iabyn - Status changed from 'open' to 'resolved'

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