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"in memory" files don't call STORE method when tied #8972

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p5pRT opened this issue Jul 11, 2007 · 4 comments

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@p5pRT
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commented Jul 11, 2007

Migrated from rt.perl.org#43789 (status was 'resolved')

Searchable as RT43789$

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commented Jul 11, 2007

From perlbug@daveola.com

Created by perlbug@daveola.com

If we open a file handle to an "in memory" file held in a perl scalar, and then tie that scalar, we don't see the STORE method called on writes to the filehandle, though they still work on normal STORE events.

Code​:

####################
{ package printHook;
  sub hook {
  my $myout;

  # Redirect EXAMPLE filehandle to the variable.
  open EXAMPLE,'>',\$myout or die "Can't open EXAMPLE​: $!\n";
  # And tie the variable to this package
  tie $myout, "printHook", "";

  # Store to the variable directly
  $myout = "direct store";
  print "\$myout is​: \"$myout\"\n";

  # Store to the variable through the filehandle
  print EXAMPLE "write to myout variable..";
  # We didn't see our STORE method called?
  print "\$myout is​: \"$myout\"\n";
  }
  sub TIESCALAR {
  my ($pkg) = @​_;
  my $obj = [];
  bless $obj, $pkg;
  return $obj;
  }
  sub STORE {
  my ($obj, $val) = @​_;
  print STDERR "Wrote var <- $val\n";
  $obj->[0] = $val;
  return $val;
  }
  sub FETCH { return $_[0][0]; }
}

printHook->hook();
####################

The output is​:

---
Wrote var <- direct store
$myout is​: "direct store"
$myout is​: "write to myout variable.."
---

Expected output​:

---
Wrote var <- direct store
$myout is​: "direct store"
Wrote var <- write to myout variable..
$myout is​: "write to myout variable.."
---

Perl Info

Flags:
    category=core
    severity=medium

Site configuration information for perl v5.8.8:

Configured by Debian Project at Wed Dec  6 23:17:41 UTC 2006.

Summary of my perl5 (revision 5 version 8 subversion 8) configuration:
  Platform:
    osname=linux, osvers=2.6.18.3, archname=i486-linux-gnu-thread-multi
    uname='linux saens 2.6.18.3 #1 smp sat nov 25 13:39:52 est 2006 i686 gnulinux '
    config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=i486-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.8 -Darchlib=/usr/lib/perl/5.8 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.8.8 -Dsitearch=/usr/local/lib/perl/5.8.8 -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 -Uusesfio -Uusenm -Duseshrplib -Dlibperl=libperl.so.5.8.8 -Dd_dosuid -des'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=define use5005threads=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='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include'
    ccversion='', gccversion='4.1.2 20061115 (prerelease) (Debian 4.1.1-20)', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
    perllibs=-ldl -lm -lpthread -lc -lcrypt
    libc=/lib/libc-2.3.6.so, so=so, useshrplib=true, libperl=libperl.so.5.8.8
    gnulibc_version='2.3.6'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    


@INC for perl v5.8.8:
    /etc/perl
    /usr/local/lib/perl/5.8.8
    /usr/local/share/perl/5.8.8
    /usr/lib/perl5
    /usr/share/perl5
    /usr/lib/perl/5.8
    /usr/share/perl/5.8
    /usr/local/lib/site_perl
    /usr/local/lib/perl/5.8.4
    /usr/local/share/perl/5.8.4
    .


Environment for perl v5.8.8:
    HOME=/home/dave
    LANG=C
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=.:/home/dave/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games:/usr/X11R6/bin:/sbin:/usr/sbin:/usr/local/sbin:/WWW/web/MarginalHacks.com/bin
    PERL_BADLANG (unset)
    SHELL=/usr/bin/tcsh

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commented May 5, 2010

From @iabyn

Now fixed in blead by commit
ffe0bb5

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commented May 5, 2010

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

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commented May 5, 2010

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

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