From rd@thrush.com

  All tests pass except one subtest in "pragma/warnings". The
  problem appears to be related to detecting input from
  filehandle dup'd from STDOUT.

  Here's a snippet from the "make test" results​:

cd t && (rm -f perl; /bin/ln -s ../perl perl)
if (true </dev/tty) >/dev/null 2>&1; then cd t && LD_LIBRARY_PATH=/u2/u4/work/bsdi/perl5.005_63​: ./perl TEST </dev/tty; else cd t && PERL_SKIP_TTY_TEST=1 LD_LIBRARY_PATH=/u2/u4/work/bsdi/perl5.005_63​: ./perl TEST; fi
base/cond...........ok
  [...]
pragma/utf8.........ok
pragma/warnings.....PROG​:
# pp_hot.c [pp_print]
use warnings 'io' ;
print STDIN "anc";
print <STDOUT>;
print <STDERR>;
open(FOO, ">&STDOUT") and print <FOO>;
print getc(STDERR);
print getc(FOO);
####################################################################
# The next test is known to fail on some systems (Linux/BSD+glibc, #
# NeXT among others. glibc should be fixed in the next version, #
# but it appears other platforms have little hope. We skip it for #
# now (on the grounds that it is "just" a warning). #
####################################################################
#read(FOO,$_,1);
no warnings 'io' ;
print STDIN "anc";
EXPECTED​:
Filehandle main​::STDIN opened only for input at - line 3.
Filehandle main​::STDOUT opened only for output at - line 4.
Filehandle main​::STDERR opened only for output at - line 5.
Filehandle main​::FOO opened only for output at - line 6.
Filehandle main​::STDERR opened only for output at - line 7.
Filehandle main​::FOO opened only for output at - line 8.
GOT​:
Filehandle main​::STDIN opened only for input at - line 3.
Filehandle main​::STDOUT opened only for output at - line 4.
Filehandle main​::STDERR opened only for output at - line 5.
Filehandle main​::STDERR opened only for output at - line 7.
FAILED at test 215
lib/abbrev..........ok
  [...]
Failed 1 test script out of 226, 99.56% okay.
u=2.06667 s=1.58333 cu=111.033 cs=31.5833 scripts=226 tests=11094

  Since the problem appeared to be failure to detect reading from
  a dup'd output filehandle, I reduced the test to​:

use warnings 'io';
open(FOO, ">&STDOUT") and print <FOO>;

  Running the above snippet from the commandline, ie.​:

export LD_LIBRARY_PATH=/u2/u4/work/bsdi/perl5.005_63
./perl -I../lib /tmp/tmp0004

  works as expected and produces the result​:

Filehandle main​::FOO opened only for output at /tmp/tmp0004 line 2.

  However, running the same program sequence within the test harness
  results in no output.

  Investigating further, I noticed that the following program​:

use warnings 'io';
open(FOO, ">&STDERR") and print <FOO>;
open(BAR, ">&STDOUT") and print <BAR>;
open(FOO, ">xyzzy") or die "Can't create \"xyzzy\"​: $!";
open(BAR, ">&FOO") and print <BAR>;

  run from the commandline results in​:

Filehandle main​::FOO opened only for output at /tmp/tmp0004 line 2.
Filehandle main​::BAR opened only for output at /tmp/tmp0004 line 3.
Filehandle main​::BAR opened only for output at /tmp/tmp0004 line 5.

  which appears to be as expected. However, when run from this
  wrapper​:

use warnings 'io';
my $result=`./perl -I../lib /tmp/tmp0004`;
print $result, "\n";

  the results are​:

Filehandle main​::FOO opened only for output at /tmp/tmp0004 line 2.
Filehandle main​::BAR opened only for output at /tmp/tmp0004 line 5.

  Something unexpected happens when the STDOUT filehandle is
  dup'd in a child process...

Site configuration information for perl 5.00563:

Configured by root at Fri Dec 10 13:50:28 EST 1999.

Summary of my perl5 (revision 5.0 version 5 subversion 63) configuration:
  Platform:
    osname=bsdos, osvers=4.0, archname=i386-bsdos
    uname='bsdos tarpit.thrush.com 4.0 bsdi bsdos 4.0 kernel #2: sun mar 21 03:57:22 est 1999 rd@tarpit.thrush.com:usrsrcsyscompilelocal i386 '
    config_args='-des -Dprefix=/opt/perl'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef useperlio=undef d_sfio=undef
    use64bits=undef usemultiplicity=undef
  Compiler:
    cc='cc', optimize='-O2', gccversion=2.7.2.1
    cppflags='-I/usr/local/include'
    ccflags ='-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='ld', ldflags =' -L/usr/X11/lib -L/usr/local/lib'
    libpth=/usr/local/lib /usr/shlib /shlib /usr/lib /usr/X11/lib
    libs=-ldl -lm -lc
    libc=/shlib/libc.so, so=so, useshrplib=true, libperl=libperl.so
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
    cccdlflags='-fPIC', lddlflags='-shared -x  -L/usr/X11/lib -L/usr/local/lib'

Locally applied patches:
    


@INC for perl 5.00563:
    lib
    /opt/perl/lib/5.00563/i386-bsdos
    /opt/perl/lib/5.00563
    /opt/perl/lib/site_perl/5.00563/i386-bsdos
    /opt/perl/lib/site_perl
    .


Environment for perl 5.00563:
    HOME=/home/rd
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH=/u2/u4/work/bsdi/perl5.005_63:
    LOGDIR (unset)
    PATH=/home/rd/bin:/usr/local/bin:/usr/local/samba/bin:/sbin:/usr/sbin:/bin:/usr/bin:/usr/contrib/bin:/usr/X11/bin
    PERL_BADLANG (unset)
    SHELL=/bin/bash