BugIDVersionCreatedFixed In
  20010925.051 headers
  (0 msgs)   History
    2001-09-25 19:30:15    
Status:     Group:     Severity:     OS: linux  
Sourceaddr: Dave  
Subject: <> vs <STDIN> is OS specific  
This is a bug report for perl from xxxxxxx@daveola.com,
generated with the help of perlbug 1.26 running under perl 5.00503.

[Please enter your report here]

I wrote a simple STDIN inline filter that puts a command in
the path of STDIN.  It sends STDIN to open2, and then takes the
output of that and dups it back to STDIN.

When I then read from <> (as opposed to <STDIN>), I get nothing
on a linux box (tested with 5.005, 5.004, 5.6.0 and 5.6.1), but
it works fine on other OS (at least Solaris).

use IO::File;
use IPC::Open2;
sub stdin_filter {
  my ($cmd) = @_;
  die("Couldn't fork $!") if $pid == -1;
  open(STDIN,"<&TMPIN");        # Dup back to STDIN

#while(<STDIN>) { print "new $_"; }	# Works everywhere
while(<>) { print "new $_"; }		# Works if !linux

[Please do not change anything below this line]

Site configuration information for perl 5.00503:

Configured by root at Mon Aug 30 23:08:56 EDT 1999.

Summary of my perl5 (5.0 patchlevel 5 subversion 3) configuration:
    osname=linux, osvers=2.2.5-22smp, archname=i386-linux
    uname='linux porky.devel.redhat.com 2.2.5-22smp #1 smp wed jun 2 09:11:51 edt 1999 i686 unknown '
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef useperlio=undef d_sfio=undef
    cc='cc', optimize='-O2', gccversion=egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
    cppflags='-Dbool=char -DHAS_BOOL -I/usr/local/include'
    ccflags ='-Dbool=char -DHAS_BOOL -I/usr/local/include'
    stdchar='char', d_stdstdio=undef, 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 =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lnsl -ldl -lm -lc -lposix -lcrypt
    libc=, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:

@INC for perl 5.00503:

Environment for perl 5.00503:
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PERL_BADLANG (unset)