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Odd memory leak #1104

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p5pRT opened this issue Jan 30, 2000 · 2 comments
Closed

Odd memory leak #1104

p5pRT opened this issue Jan 30, 2000 · 2 comments

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@p5pRT
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@p5pRT p5pRT commented Jan 30, 2000

Migrated from rt.perl.org#2058 (status was 'resolved')

Searchable as RT2058$

@p5pRT
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@p5pRT p5pRT commented Jan 30, 2000

From gerti@bitart.com

Created by gerti@bitart.com

The short program below leaks under various versions of perl and
on various OS. Am I missing something, or is this a bug in perl?

Thanks!

$x="TST00000";
while(1)
{
  my $handle=$x++;
  open($handle,'/etc/rc'); # or any other file
  close($handle);
}

Perl Info


Site configuration information for perl 5.00502:

Configured by gerti at Tue Mar 23 16:36:15 CST 1999.

Summary of my perl5 (5.0 patchlevel 5 subversion 2) configuration:
  Platform:
    osname=next, osvers=3_3, archname=i386-next
    uname='camelot '
    hint=recommended, useposix=true, d_sigaction=undef
    usethreads=undef useperlio=undef d_sfio=undef
  Compiler:
    cc='cc', optimize='-O', gccversion=NeXT DevKit-based CPP 3.1
    cppflags='-DUSE_NEXT_CTYPE -I/usr/local/include'
    ccflags ='-DUSE_NEXT_CTYPE -I/usr/local/include'
    stdchar='char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    alignbytes=4, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='cc', ldflags ='-u libsys_s -L/usr/local/lib'
    libpth=/usr/local/lib /usr/shlib /lib /usr/lib
    libs=-ldbm
    libc=/lib/libsys_s.a, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_next.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
    cccdlflags=' ', lddlflags='-nostdlib -r -L/usr/local/lib'

Locally applied patches:
    


@INC for perl 5.00502:
    /theUsers/gerti/Unix/lib/perl5
    /theUsers/gerti/Clients/Interfax/Distribution/INFax.3/lib
    /usr/local/lib/perl5/5.00502/i386-next
    /usr/local/lib/perl5/5.00502
    /usr/local/lib/perl5/site_perl/5.005/i386-next
    /usr/local/lib/perl5/site_perl/5.005
    .


Environment for perl 5.00502:
    HOME=/theUsers/gerti
    LANG (unset)
    LD_LIBRARY_PATH=/usr/lib:/usr/local/lib
    LOGDIR (unset)
    PATH=.:/etc:/usr/etc:/theUsers/gerti/Unix/bin:/usr/local/bin:/usr/local/netpbm/bin:/usr/ucb:/bin:/usr/bin:/usr/sybase/bin:/theUsers/gerti/Apps:/LocalApps:/NextApps:/NextAdmin:/NextDeveloper/Demos:/usr/local/bin/ezmlm
    PERL5LIB=/theUsers/gerti/Unix/lib/perl5:/theUsers/gerti/Clients/Interfax/Distribution/INFax.3/lib
    PERL_BADLANG (unset)
    SHELL=/usr/bin/zsh


@p5pRT
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@p5pRT p5pRT commented Jan 31, 2000

From @gsar

On 31 Jan 2000 07​:46​:24 GMT, gerti@​bitart.com wrote​:

The short program below leaks under various versions of perl and
on various OS. Am I missing something, or is this a bug in perl?

Thanks!

$x="TST00000";
while(1)
{
my $handle=$x++;
open($handle,'/etc/rc'); # or any other file
close($handle);
}

You're filling up the symbol table with empty symbols (closed
filehandles). Create anonymous symbols with Symbol instead.

  use Symbol;
  while (1) {
  open(my $handle = gensym, '/etc/rc') or die;
  close $handle;
  }

In 5.6, you'll be able to shorten that to​:

  while (1) {
  open my $handle, '/etc/rc' or die;
  close $handle;
  }

Sarathy
gsar@​ActiveState.com

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