Listen to socket does not return when host is undefined or 0.0.0.0.

[p5pRT]

Migrated from rt.perl.org#88080 (status was 'resolved')

Searchable as RT88080$

[p5pRT]

From Bo.Johansson@lsn.se

Created by bo.johansson@lsn.se

The perl function listen does not return when host is undefined or 0.0.0.0.
Sometimes it also gets Windows 7 in unstable state and normal shut down is impossible.

Example​: This is setup_listener from HTTP-Server-Simple-0.44/lib/HTTP/Server/Simple.pm

sub setup_listener {
  my $self = shift;

  my $tcp = getprotobyname('tcp');
  socket( HTTPDaemon, PF_INET, SOCK_STREAM, $tcp ) or croak "socket​: $!";
  setsockopt( HTTPDaemon, SOL_SOCKET, SO_REUSEADDR, pack( "l", 1 ) )
  or warn "setsockopt​: $!";
  bind( HTTPDaemon,
  sockaddr_in(
  $self->port(),
  ( $self->host
  ? inet_aton( $self->host )
  : INADDR_ANY
  )
  )
  )
  or croak "bind to @​{[$self->host||'*']}​:@​{[$self->port]}​: $!";
  listen( HTTPDaemon, SOMAXCONN ) or croak "listen​: $!";
}

If $self->host is undefined or '0.0.0.0' the call to listen does not return.
Sometimes it gets Windows 7 in unstable state and

Perl Info

Flags:
    category=core
    severity=low

Site configuration information for perl 5.12.2:

Configured by 1 at Fri Nov  5 08:33:05 2010.

Summary of my perl5 (revision 5 version 12 subversion 2) configuration:
   
  Platform:
    osname=MSWin32, osvers=5.1, archname=MSWin32-x86-multi-thread
    uname='Win32 strawberryperl 5.12.2.0 #1 Fri Nov  5 05:17:27 2010 i386'
    config_args='undef'
    hint=recommended, useposix=true, d_sigaction=undef
    useithreads=define, usemultiplicity=define
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=undef, use64bitall=undef, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='gcc', ccflags =' -s -O2 -DWIN32 -DHAVE_DES_FCRYPT  -DUSE_SITECUSTOMIZE -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -fno-strict-aliasing -mms-bitfields -DPERL_MSVCRT_READFIX',
    optimize='-s -O2',
    cppflags='-DWIN32'
    ccversion='', gccversion='4.4.3', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=undef, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='long long', lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='g++', ldflags ='-s -L"C:\strawberry\perl\lib\CORE" -L"C:\strawberry\c\lib"'
    libpth=C:\strawberry\c\lib C:\strawberry\c\i686-w64-mingw32\lib
    libs=-lmoldname -lkernel32 -luser32 -lgdi32 -lwinspool -lcomdlg32 -ladvapi32 -lshell32 -lole32 -loleaut32 -lnetapi32 -luuid -lws2_32 -lmpr -lwinmm -lversion -lodbc32 -lodbccp32 -lcomctl32
    perllibs=-lmoldname -lkernel32 -luser32 -lgdi32 -lwinspool -lcomdlg32 -ladvapi32 -lshell32 -lole32 -loleaut32 -lnetapi32 -luuid -lws2_32 -lmpr -lwinmm -lversion -lodbc32 -lodbccp32 -lcomctl32
    libc=, so=dll, useshrplib=true, libperl=libperl512.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_win32.xs, dlext=dll, d_dlsymun=undef, ccdlflags=' '
    cccdlflags=' ', lddlflags='-mdll -s -L"C:\strawberry\perl\lib\CORE" -L"C:\strawberry\c\lib"'

Locally applied patches:
    


@INC for perl 5.12.2:
    C:/strawberry/perl/site/lib
    C:/strawberry/perl/vendor/lib
    C:/strawberry/perl/lib
    .


Environment for perl 5.12.2:
    HOME (unset)
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=C:\Program Files\NVIDIA Corporation\PhysX\Common;C:\Program Files\Common Files\ArcSoft\Bin;C:\Program Files\Common Files\Microsoft Shared\Windows Live;c:\Parrot-2.8.0\bin;S:\ins\ant\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;c:\Program Files\Emacs\EmacsW32\gnuwin32\bin\;c:\Program Files\Java\jdk1.6.0_16\bin;C:\hp\bin\Python;C:\Windows\System32\WindowsPowerShell\v1.0\;c:\Program Files\Microsoft SQL Server\100\Tools\Binn\;c:\Program Files\Microsoft SQL Server\100\DTS\Binn\;C:\Program Files\Graphviz2.26.3\bin;C:\strawberry\c\bin;C:\strawberry\perl\bin;C:\gnuwin32\bin;C:\Parrot-2.8.0\bin;C:\Parrot-2.8.0\bin;C:\Program Files\Windows Live\Shared;C:\Program Files\QuickTime\QTSystem\;C:\strawberry\perl\site\bin;C:\Program Files\Microsoft Windows Performance Toolkit\;C:\Program Files\Git\cmd
    PERL_BADLANG (unset)
    SHELL (unset)

[p5pRT]

From @jkeenan

On Fri, 08 Apr 2011 08​:47​:19 GMT, boilund wrote​:

This is a bug report for perl from bo.johansson@​lsn.se,
generated with the help of perlbug 1.39 running under perl 5.12.2.

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

The perl function listen does not return when host is undefined or
0.0.0.0.
Sometimes it also gets Windows 7 in unstable state and normal shut
down is impossible.

Example​: This is setup_listener from HTTP-Server-Simple-
0.44/lib/HTTP/Server/Simple.pm

sub setup_listener {
my $self = shift;

my $tcp = getprotobyname('tcp');
socket( HTTPDaemon, PF_INET, SOCK_STREAM, $tcp ) or croak "socket​:
$!";
setsockopt( HTTPDaemon, SOL_SOCKET, SO_REUSEADDR, pack( "l", 1 ) )
or warn "setsockopt​: $!";
bind( HTTPDaemon,
sockaddr_in(
$self->port(),
( $self->host
? inet_aton( $self->host )
: INADDR_ANY
)
)
)
or croak "bind to @​{[$self->host||'*']}​:@​{[$self->port]}​: $!";
listen( HTTPDaemon, SOMAXCONN ) or croak "listen​: $!";
}

If $self->host is undefined or '0.0.0.0' the call to listen does not
return.
Sometimes it gets Windows 7 in unstable state and

Can the problem with Perl function 'listen' (assuming there *is* a problem) be demonstrated apart from this use in HTTP​::Server​::Simple?

The code provided is not sufficient to reproduce the problem (at least by a person not already familiar with that module).

Thank you very much.

--
James E Keenan (jkeenan@​cpan.org)

[p5pRT]

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

[p5pRT]

From Bo.Johansson@lsn.se

Hej!

I have run​:

  use strict;
  use warnings;

  use HTTP​::Server​::Simple;

  my $server = HTTP​::Server​::Simple->new();
  $server->host( undef );
  #$server->host( '0.0.0.0' );
  $server->run();

Using "$server->host( undef );" or "$server->host( '0.0.0.0' );" works
with HTTP​::Server​::Simple version 0.51!

Best regards
Bo Johansson

Den 2016-12-31 kl. 16​:14, skrev James E Keenan via RT​:

On Fri, 08 Apr 2011 08​:47​:19 GMT, boilund wrote​:

This is a bug report for perl from bo.johansson@​lsn.se,
generated with the help of perlbug 1.39 running under perl 5.12.2.

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

The perl function listen does not return when host is undefined or
0.0.0.0.
Sometimes it also gets Windows 7 in unstable state and normal shut
down is impossible.

Example​: This is setup_listener from HTTP-Server-Simple-
0.44/lib/HTTP/Server/Simple.pm

sub setup_listener {
my $self = shift;

my $tcp = getprotobyname('tcp');
socket( HTTPDaemon, PF_INET, SOCK_STREAM, $tcp ) or croak "socket​:
$!";
setsockopt( HTTPDaemon, SOL_SOCKET, SO_REUSEADDR, pack( "l", 1 ) )
or warn "setsockopt​: $!";
bind( HTTPDaemon,
sockaddr_in(
$self->port(),
( $self->host
? inet_aton( $self->host )
: INADDR_ANY
)
)
)
or croak "bind to @​{[$self->host||'*']}​:@​{[$self->port]}​: $!";
listen( HTTPDaemon, SOMAXCONN ) or croak "listen​: $!";
}

If $self->host is undefined or '0.0.0.0' the call to listen does not
return.
Sometimes it gets Windows 7 in unstable state and

Can the problem with Perl function 'listen' (assuming there *is* a problem) be demonstrated apart from this use in HTTP​::Server​::Simple?

The code provided is not sufficient to reproduce the problem (at least by a person not already familiar with that module).

Thank you very much.

[p5pRT]

From @jkeenan

On Sun, 01 Jan 2017 10​:36​:01 GMT, boilund wrote​:

Hej!

I have run​:

use strict;
use warnings;

use HTTP​::Server​::Simple;

my $server = HTTP​::Server​::Simple->new();
$server->host( undef );
#$server->host( '0.0.0.0' );
$server->run();

Using "$server->host( undef );" or "$server->host( '0.0.0.0' );" works
with HTTP​::Server​::Simple version 0.51!

Best regards
Bo Johansson

Den 2016-12-31 kl. 16​:14, skrev James E Keenan via RT​:

On Fri, 08 Apr 2011 08​:47​:19 GMT, boilund wrote​:

This is a bug report for perl from bo.johansson@​lsn.se,
generated with the help of perlbug 1.39 running under perl 5.12.2.

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

The perl function listen does not return when host is undefined or
0.0.0.0.
Sometimes it also gets Windows 7 in unstable state and normal shut
down is impossible.

Example​: This is setup_listener from HTTP-Server-Simple-
0.44/lib/HTTP/Server/Simple.pm

sub setup_listener {
my $self = shift;

my $tcp = getprotobyname('tcp');
socket( HTTPDaemon, PF_INET, SOCK_STREAM, $tcp ) or croak "socket​:
$!";
setsockopt( HTTPDaemon, SOL_SOCKET, SO_REUSEADDR, pack( "l", 1 ) )
or warn "setsockopt​: $!";
bind( HTTPDaemon,
sockaddr_in(
$self->port(),
( $self->host
? inet_aton( $self->host )
: INADDR_ANY
)
)
)
or croak "bind to @​{[$self->host||'*']}​:@​{[$self->port]}​: $!";
listen( HTTPDaemon, SOMAXCONN ) or croak "listen​: $!";
}

If $self->host is undefined or '0.0.0.0' the call to listen does not
return.
Sometimes it gets Windows 7 in unstable state and

Can the problem with Perl function 'listen' (assuming there *is* a
problem) be demonstrated apart from this use in HTTP​::Server​::Simple?

The code provided is not sufficient to reproduce the problem (at
least by a person not already familiar with that module).

Thank you very much.

I modified HTTP​::Server​::Simple​::setup_listener() to capture the return value of 'listen()' before returning from the method.

#####
  my $rv = listen( HTTPDaemon, SOMAXCONN ) or croak "listen​: $!";
  return $rv;
#####

I then called your program -- with '$server->host(undef)' -- with the perl debugger and stepped through to the lines above. The value of '$rv' is '1', so listen() returned a true value.

Where the program *did* hang was in this part of subroutine '_default_run(()'​:

#####
  while ($SERVER_SHOULD_RUN) {
  local $SIG{PIPE} = 'IGNORE'; # If we don't ignore SIGPIPE, a
  # client closing the connection before we
  # finish sending will cause the server to exit
  while ( accept( my $remote = new FileHandle, HTTPDaemon ) ) {
#####

The program hung on the 2nd 'while' loop. When I hit Ctrl-C, the program resumed at the 'local $SIG{PIPE}...' line.

--
James E Keenan (jkeenan@​cpan.org)

[p5pRT]

From @Leont

On Sun, Jan 1, 2017 at 11​:34 AM, Bo Johansson <bo.johansson@​lsn.se> wrote​:

Hej!

I have run​:

use strict;
use warnings;

use HTTP​::Server​::Simple;

my $server = HTTP​::Server​::Simple->new();
$server->host( undef );
#$server->host( '0.0.0.0' );
$server->run();

Using "$server->host( undef );" or "$server->host( '0.0.0.0' );" works
with HTTP​::Server​::Simple version 0.51!
Best regards
Bo Johansson

Does that mean this ticket is closable?

Leon

[p5pRT]

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

[p5pRT]

From @iabyn

On Sun, Jan 01, 2017 at 07​:20​:48PM +0100, Leon Timmermans wrote​:

On Sun, Jan 1, 2017 at 11​:34 AM, Bo Johansson <bo.johansson@​lsn.se> wrote​:

Hej!

I have run​:

use strict;
use warnings;

use HTTP​::Server​::Simple;

my $server = HTTP​::Server​::Simple->new();
$server->host( undef );
#$server->host( '0.0.0.0' );
$server->run();

Using "$server->host( undef );" or "$server->host( '0.0.0.0' );" works
with HTTP​::Server​::Simple version 0.51!
Best regards
Bo Johansson

Does that mean this ticket is closable?

In the absence of any further feedback, I'm closing this ticket.

--
Overhead, without any fuss, the stars were going out.
  -- Arthur C Clarke