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|
# NOTE: this file tests how large files (>2GB) work with perlio (stdio/sfio).
# sysopen(), sysseek(), syswrite(), sysread() are tested in t/lib/syslfs.t.
# If you modify/add tests here, remember to update also t/lib/syslfs.t.
BEGIN {
# Don't bother if there are no quads.
eval { my $q = pack "q", 0 };
if ($@) {
print "1..0\n# no 64-bit types\n";
bye();
}
chdir 't' if -d 't';
unshift @INC, '../lib';
}
sub bye {
close(BIG);
unlink "big";
exit(0);
}
# Known have-nots.
if ($^O eq 'win32' || $^O eq 'vms') {
print "1..0\n# no sparse files\n";
bye();
}
# Then try to deduce whether we have sparse files.
my ($SEEK_SET, $SEEK_CUR, $SEEK_END) = (0, 1, 2);
# We'll start off by creating a one megabyte file which has
# only three "true" bytes. If we have sparseness, we should
# consume less blocks than one megabyte (assuming nobody has
# one megabyte blocks...)
open(BIG, ">big") or do { warn "open failed: $!\n"; bye };
binmode BIG;
seek(BIG, 1_000_000, $SEEK_SET);
print BIG "big";
close(BIG);
my @s;
@s = stat("big");
print "# @s\n";
unless (@s == 13 &&
$s[7] == 1_000_003 &&
defined $s[11] &&
defined $s[12] &&
$s[11] * $s[12] < 1000_003) {
print "1..0\n# no sparse files?\n";
bye();
}
# By now we better be sure that we do have sparse files:
# if we are not, the following will hog 5 gigabytes of disk. Ooops.
print "1..8\n";
my $fail = 0;
open(BIG, ">big") or do { warn "open failed: $!\n"; bye };
binmode BIG;
seek(BIG, 5_000_000_000, $SEEK_SET);
print BIG "big";
close BIG;
@s = stat("big");
print "# @s\n";
sub fail () {
print " not ";
$fail++;
}
fail unless $s[7] == 5_000_000_003;
print "ok 1\n";
fail unless -s "big" == 5_000_000_003;
print "ok 2\n";
open(BIG, "big") or do { warn "open failed: $!\n"; bye };
binmode BIG;
seek(BIG, 4_500_000_000, $SEEK_SET);
fail unless tell(BIG) == 4_500_000_000;
print "ok 3\n";
seek(BIG, 1, $SEEK_CUR);
fail unless tell(BIG) == 4_500_000_001;
print "ok 4\n";
seek(BIG, -1, $SEEK_CUR);
fail unless tell(BIG) == 4_500_000_000;
print "ok 5\n";
seek(BIG, -3, $SEEK_END);
fail unless tell(BIG) == 5_000_000_000;
print "ok 6\n";
my $big;
fail unless read(BIG, $big, 3) == 3;
print "ok 7\n";
fail unless $big eq "big";
print "ok 8\n";
bye();
if ($fail) {
print STDERR <<EOM;
#
# If the lfs (large file support) tests fail, it means that
# the *file system* you are running the tests on doesn't support
# large files (files larger than two gigabytes). Perl may still
# be able to support such files, once you have such a file system.
#
EOM
}
# eof
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