source: vendor/perl/5.8.8/t/io/read.t

#!./perl

# $RCSfile$

BEGIN {
    chdir 't' if -d 't';
    @INC = '../lib';
    require './test.pl';
}

use strict;
eval 'use Errno';
die $@ if $@ and !$ENV{PERL_CORE_MINITEST};

plan tests => 2;

open(A,"+>a");
print A "_";
seek(A,0,0);

my $b = "abcd"; 
$b = "";

read(A,$b,1,4);

close(A);

unlink("a");

is($b,"\000\000\000\000_"); # otherwise probably "\000bcd_"

unlink 'a';

SKIP: {
    skip "no EBADF", 1 if (!exists &Errno::EBADF);

    $! = 0;
    read(B,$b,1);
    ok($! == &Errno::EBADF);
}