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reopen of STDIN doesn't flush input buffer #7723

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p5pRT opened this issue Dec 25, 2004 · 6 comments
Open

reopen of STDIN doesn't flush input buffer #7723

p5pRT opened this issue Dec 25, 2004 · 6 comments
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distro-Linux type-core type-PerlIO

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@p5pRT
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p5pRT commented Dec 25, 2004

Migrated from rt.perl.org#33180 (status was 'open')

Searchable as RT33180$
@p5pRT
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p5pRT commented Dec 25, 2004

From perl-5.8.0@ton.iguana.be

Created by perl-5.8.0@ton.iguana.be

contents of file foo​:
----
abc
def
ghi
jkl
----

contents of file bar​:
----
123
456
789
----

program​:
----
#! /usr/bin/perl -w
use strict;
# local *STDIN;
sub stdin {
  my $name = shift;
  open(STDIN, "<", $name) || die "Could not open $name​: $!";
  my $foo = <STDIN>;
  print "Read $name=$foo";
}

stdin("foo");
stdin("bar");
----

outputs​:

Read foo=abc
Read bar=def

it works as expected for 1) other filehandles, 2) if you uncomment
the local *STDIN line or 3) if you close STDIN before doing the open​:

Read foo=abc
Read bar=123

Perl Info 

Flags:
    category=core
    severity=medium

This perlbug was built using Perl v5.8.6 - Fri Dec 24 19:25:13 CET 2004
It is being executed now by  Perl v5.8.4 - Thu Jun  3 13:28:19 CEST 2004.

Site configuration information for perl v5.8.4:

Configured by ton at Thu Jun  3 13:28:19 CEST 2004.

Summary of my perl5 (revision 5 version 8 subversion 4) configuration:
  Platform:
    osname=linux, osvers=2.6.5, archname=i686-linux-64int-ld
    uname='linux quasar 2.6.5 #8 mon apr 5 05:41:20 cest 2004 i686 gnulinux '
    config_args=''
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=define use64bitall=undef uselongdouble=define
    usemymalloc=y, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2 -fomit-frame-pointer',
    cppflags='-fno-strict-aliasing -I/usr/local/include'
    ccversion='', gccversion='3.4.0 20031231 (experimental)', 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='long double', nvsize=12, 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=-lnsl -ldb -ldl -lm -lcrypt -lutil -lc
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
    libc=/lib/libc-2.3.2.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.3.2'
  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 v5.8.4:
    /usr/lib/perl5/5.8.4/i686-linux-64int-ld
    /usr/lib/perl5/5.8.4
    /usr/lib/perl5/site_perl/5.8.4/i686-linux-64int-ld
    /usr/lib/perl5/site_perl/5.8.4
    /usr/lib/perl5/site_perl
    .


Environment for perl v5.8.4:
    HOME=/home/ton
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/ton/bin.Linux:/home/ton/bin:/home/ton/bin.SampleSetup:/opt/schily/bin:/usr/local/bin:/usr/local/sbin:/home/oracle/product/9.0.1/bin:/usr/local/ar/bin:/usr/games/bin:/usr/X11R6/bin:/usr/share/bin:/usr/bin:/usr/sbin:/bin:/sbin:.
    PERL_BADLANG (unset)
    SHELL=/bin/bash

@p5pRT
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p5pRT commented Oct 12, 2012

From @jkeenan

On Fri Dec 24 17​:19​:22 2004, perl-5.8.0@​ton.iguana.be wrote​:

This is a bug report for perl from perl-5.8.0@​ton.iguana.be,
generated with the help of perlbug 1.35 running under perl v5.8.4.

-----------------------------------------------------------------
[Please enter your report here]

contents of file foo​:
----
abc
def
ghi
jkl
----

contents of file bar​:
----
123
456
789
----

program​:
----
#! /usr/bin/perl -w
use strict;
# local *STDIN;
sub stdin {
my $name = shift;
open(STDIN, "<", $name) || die "Could not open $name​: $!";
my $foo = <STDIN>;
print "Read $name=$foo";
}

stdin("foo");
stdin("bar");
----

outputs​:

Read foo=abc
Read bar=def

it works as expected for 1) other filehandles, 2) if you uncomment
the local *STDIN line or 3) if you close STDIN before doing the open​:

Read foo=abc
Read bar=123

This RT has not attracted any comments since being filed nearly eight
years ago. I have confirmed the OP's claim. In the hope of getting
more eyeballs on the ticket, I am attaching three files which can be
used to verify the problem.

Thank you very much.
Jim Keenan

@p5pRT
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p5pRT commented Oct 12, 2012

From @jkeenan

bar_33180

@p5pRT
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p5pRT commented Oct 12, 2012

From @jkeenan

33180.pl

@p5pRT
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p5pRT commented Oct 12, 2012

From @jkeenan

foo_33180

@p5pRT
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p5pRT commented Oct 12, 2012

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

@xenu xenu removed the affects-5.8 label Nov 19, 2021
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