# 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 ext/Fcntl/t/syslfs.t.

BEGIN {

chdir 't' if -d 't';

@INC = '../lib';

# Don't bother if there are no quad offsets.

require Config; import Config;

if ($Config{lseeksize} < 8) {

print "1..0 # Skip: no 64-bit file offsets\n";

exit(0);

}

}

use strict;

our @s;

our $fail;

sub zap {

close(BIG);

unlink("big");

unlink("big1");

unlink("big2");

}

sub bye {

zap();

exit(0);

}

my $explained;

sub explain {

unless ($explained++) {

print <<EOM;

#

# If the lfs (large file support: large meaning larger than two

# gigabytes) tests are skipped or fail, it may mean either that your

# process (or process group) is not allowed to write large files

# (resource limits) or that the file system (the network filesystem?)

# you are running the tests on doesn't let your user/group have large

# files (quota) or the filesystem simply doesn't support large files.

# You may even need to reconfigure your kernel. (This is all very

# operating system and site-dependent.)

#

# Perl may still be able to support large files, once you have

# such a process, enough quota, and such a (file) system.

# It is just that the test failed now.

#

EOM

}

print "1..0 # Skip: @_\n" if @_;

}

$| = 1;

print "# checking whether we have sparse files...\n";

# Known have-nots.

if ($^O eq 'MSWin32' || $^O eq 'NetWare' || $^O eq 'VMS') {

print "1..0 # Skip: no sparse files in $^O\n";

bye();

}

# Known haves that have problems running this test

# (for example because they do not support sparse files, like UNICOS)

if ($^O eq 'unicos') {

print "1..0 # Skip: no sparse files in $^0, unable to test large files\n";

bye();

}

# Then try to heuristically deduce whether we have sparse files.

# Let's not depend on Fcntl or any other extension.

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, ">big1") or

do { warn "open big1 failed: $!\n"; bye };

binmode(BIG) or

do { warn "binmode big1 failed: $!\n"; bye };

seek(BIG, 1_000_000, $SEEK_SET) or

do { warn "seek big1 failed: $!\n"; bye };

print BIG "big" or

do { warn "print big1 failed: $!\n"; bye };

close(BIG) or

do { warn "close big1 failed: $!\n"; bye };

my @s1 = stat("big1");

print "# s1 = @s1\n";

open(BIG, ">big2") or

do { warn "open big2 failed: $!\n"; bye };

binmode(BIG) or

do { warn "binmode big2 failed: $!\n"; bye };

seek(BIG, 2_000_000, $SEEK_SET) or

do { warn "seek big2 failed; $!\n"; bye };

print BIG "big" or

do { warn "print big2 failed; $!\n"; bye };

close(BIG) or

do { warn "close big2 failed; $!\n"; bye };

my @s2 = stat("big2");

print "# s2 = @s2\n";

zap();

unless ($s1[7] == 1_000_003 && $s2[7] == 2_000_003 &&

$s1[11] == $s2[11] && $s1[12] == $s2[12]) {

print "1..0 # Skip: no sparse files?\n";

bye;

}

print "# we seem to have sparse files...\n";

# 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.

# This may fail by producing some signal; run in a subprocess first for safety

$ENV{LC_ALL} = "C";

my $r = system '../perl', '-e', <<'EOF';

open(BIG, ">big");

seek(BIG, 5_000_000_000, 0);

print BIG "big";

exit 0;

EOF

open(BIG, ">big") or do { warn "open failed: $!\n"; bye };

binmode BIG;

if ($r or not seek(BIG, 5_000_000_000, $SEEK_SET)) {

my $err = $r ? 'signal '.($r & 0x7f) : $!;

explain("seeking past 2GB failed: $err");

bye();

}

# Either the print or (more likely, thanks to buffering) the close will

# fail if there are are filesize limitations (process or fs).

my $print = print BIG "big";

print "# print failed: $!\n" unless $print;

my $close = close BIG;

print "# close failed: $!\n" unless $close;

unless ($print && $close) {

if ($! =~/too large/i) {

explain("writing past 2GB failed: process limits?");

} elsif ($! =~ /quota/i) {

explain("filesystem quota limits?");

} else {

explain("error: $!");

}

bye();

}

@s = stat("big");

print "# @s\n";

unless ($s[7] == 5_000_000_003) {

explain("kernel/fs not configured to use large files?");

bye();

}

sub fail () {

print "not ";

$fail++;

}

sub offset ($$) {

my ($offset_will_be, $offset_want) = @_;

my $offset_is = eval $offset_will_be;

unless ($offset_is == $offset_want) {

print "# bad offset $offset_is, want $offset_want\n";

my ($offset_func) = ($offset_will_be =~ /^(\w+)/);

if (unpack("L", pack("L", $offset_want)) == $offset_is) {

print "# 32-bit wraparound suspected in $offset_func() since\n";

print "# $offset_want cast into 32 bits equals $offset_is.\n";

} elsif ($offset_want - unpack("L", pack("L", $offset_want)) - 1

== $offset_is) {

print "# 32-bit wraparound suspected in $offset_func() since\n";

printf "# %s - unpack('L', pack('L', %s)) - 1 equals %s.\n",

$offset_want,

$offset_want,

$offset_is;

}

fail;

}

}

print "1..17\n";

$fail = 0;

fail unless $s[7] == 5_000_000_003; # exercizes pp_stat

print "ok 1\n";

fail unless -s "big" == 5_000_000_003; # exercizes pp_ftsize

print "ok 2\n";

fail unless -e "big";

print "ok 3\n";

fail unless -f "big";

print "ok 4\n";

open(BIG, "big") or do { warn "open failed: $!\n"; bye };

binmode BIG;

fail unless seek(BIG, 4_500_000_000, $SEEK_SET);

print "ok 5\n";

offset('tell(BIG)', 4_500_000_000);

print "ok 6\n";

fail unless seek(BIG, 1, $SEEK_CUR);

print "ok 7\n";

# If you get 205_032_705 from here it means that

# your tell() is returning 32-bit values since (I32)4_500_000_001

# is exactly 205_032_705.

offset('tell(BIG)', 4_500_000_001);

print "ok 8\n";

fail unless seek(BIG, -1, $SEEK_CUR);

print "ok 9\n";

offset('tell(BIG)', 4_500_000_000);

print "ok 10\n";

fail unless seek(BIG, -3, $SEEK_END);

print "ok 11\n";

offset('tell(BIG)', 5_000_000_000);

print "ok 12\n";

my $big;

fail unless read(BIG, $big, 3) == 3;

print "ok 13\n";

fail unless $big eq "big";

print "ok 14\n";

# 705_032_704 = (I32)5_000_000_000

# See that we don't have "big" in the 705_... spot:

# that would mean that we have a wraparound.

fail unless seek(BIG, 705_032_704, $SEEK_SET);

print "ok 15\n";

my $zero;

fail unless read(BIG, $zero, 3) == 3;

print "ok 16\n";

fail unless $zero eq "\0\0\0";

print "ok 17\n";

explain() if $fail;

bye(); # does the necessary cleanup

END {

# unlink may fail if applied directly to a large file

# be paranoid about leaving 5 gig files lying around

open(BIG, ">big"); # truncate

close(BIG);

1 while unlink "big"; # standard portable idiom

}

# eof