266 lines
6.8 KiB
Perl
Executable File
266 lines
6.8 KiB
Perl
Executable File
# NOTE: this file tests how large files (>2GB) work with raw system IO.
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# stdio: open(), tell(), seek(), print(), read() is tested in t/op/lfs.t.
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# If you modify/add tests here, remember to update also t/op/lfs.t.
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BEGIN {
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chdir 't' if -d 't';
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@INC = '../lib';
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require Config; import Config;
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# Don't bother if there are no quad offsets.
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if ($Config{lseeksize} < 8) {
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print "1..0 # Skip: no 64-bit file offsets\n";
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exit(0);
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}
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require Fcntl; import Fcntl qw(/^O_/ /^SEEK_/);
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}
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use strict;
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our @s;
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our $fail;
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sub zap {
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close(BIG);
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unlink("big");
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unlink("big1");
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unlink("big2");
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}
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sub bye {
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zap();
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exit(0);
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}
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my $explained;
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sub explain {
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unless ($explained++) {
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print <<EOM;
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#
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# If the lfs (large file support: large meaning larger than two
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# gigabytes) tests are skipped or fail, it may mean either that your
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# process (or process group) is not allowed to write large files
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# (resource limits) or that the file system (the network filesystem?)
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# you are running the tests on doesn't let your user/group have large
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# files (quota) or the filesystem simply doesn't support large files.
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# You may even need to reconfigure your kernel. (This is all very
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# operating system and site-dependent.)
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#
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# Perl may still be able to support large files, once you have
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# such a process, enough quota, and such a (file) system.
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# It is just that the test failed now.
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#
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EOM
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}
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print "1..0 # Skip: @_\n" if @_;
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}
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print "# checking whether we have sparse files...\n";
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# Known have-nots.
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if ($^O eq 'MSWin32' || $^O eq 'VMS') {
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print "1..0 # Skip: no sparse files in $^O\n";
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bye();
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}
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# Known haves that have problems running this test
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# (for example because they do not support sparse files, like UNICOS)
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if ($^O eq 'unicos') {
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print "1..0 # Skip: no sparse files in $^0, unable to test large files\n";
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bye();
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}
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# Then try heuristically to deduce whether we have sparse files.
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# We'll start off by creating a one megabyte file which has
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# only three "true" bytes. If we have sparseness, we should
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# consume less blocks than one megabyte (assuming nobody has
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# one megabyte blocks...)
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sysopen(BIG, "big1", O_WRONLY|O_CREAT|O_TRUNC) or
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do { warn "sysopen big1 failed: $!\n"; bye };
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sysseek(BIG, 1_000_000, SEEK_SET) or
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do { warn "sysseek big1 failed: $!\n"; bye };
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syswrite(BIG, "big") or
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do { warn "syswrite big1 failed; $!\n"; bye };
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close(BIG) or
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do { warn "close big1 failed: $!\n"; bye };
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my @s1 = stat("big1");
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print "# s1 = @s1\n";
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sysopen(BIG, "big2", O_WRONLY|O_CREAT|O_TRUNC) or
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do { warn "sysopen big2 failed: $!\n"; bye };
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sysseek(BIG, 2_000_000, SEEK_SET) or
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do { warn "sysseek big2 failed: $!\n"; bye };
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syswrite(BIG, "big") or
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do { warn "syswrite big2 failed; $!\n"; bye };
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close(BIG) or
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do { warn "close big2 failed: $!\n"; bye };
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my @s2 = stat("big2");
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print "# s2 = @s2\n";
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zap();
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unless ($s1[7] == 1_000_003 && $s2[7] == 2_000_003 &&
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$s1[11] == $s2[11] && $s1[12] == $s2[12]) {
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print "1..0 # Skip: no sparse files?\n";
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bye;
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}
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print "# we seem to have sparse files...\n";
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# By now we better be sure that we do have sparse files:
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# if we are not, the following will hog 5 gigabytes of disk. Ooops.
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# This may fail by producing some signal; run in a subprocess first for safety
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$ENV{LC_ALL} = "C";
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my $r = system '../perl', '-I../lib', '-e', <<'EOF';
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use Fcntl qw(/^O_/ /^SEEK_/);
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sysopen(BIG, "big", O_WRONLY|O_CREAT|O_TRUNC) or die $!;
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my $sysseek = sysseek(BIG, 5_000_000_000, SEEK_SET);
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my $syswrite = syswrite(BIG, "big");
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exit 0;
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EOF
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sysopen(BIG, "big", O_WRONLY|O_CREAT|O_TRUNC) or
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do { warn "sysopen 'big' failed: $!\n"; bye };
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my $sysseek = sysseek(BIG, 5_000_000_000, SEEK_SET);
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unless (! $r && defined $sysseek && $sysseek == 5_000_000_000) {
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$sysseek = 'undef' unless defined $sysseek;
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explain("seeking past 2GB failed: ",
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$r ? 'signal '.($r & 0x7f) : "$! (sysseek returned $sysseek)");
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bye();
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}
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# The syswrite will fail if there are are filesize limitations (process or fs).
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my $syswrite = syswrite(BIG, "big");
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print "# syswrite failed: $! (syswrite returned ",
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defined $syswrite ? $syswrite : 'undef', ")\n"
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unless defined $syswrite && $syswrite == 3;
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my $close = close BIG;
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print "# close failed: $!\n" unless $close;
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unless($syswrite && $close) {
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if ($! =~/too large/i) {
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explain("writing past 2GB failed: process limits?");
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} elsif ($! =~ /quota/i) {
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explain("filesystem quota limits?");
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} else {
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explain("error: $!");
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}
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bye();
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}
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@s = stat("big");
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print "# @s\n";
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unless ($s[7] == 5_000_000_003) {
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explain("kernel/fs not configured to use large files?");
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bye();
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}
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sub fail () {
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print "not ";
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$fail++;
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}
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sub offset ($$) {
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my ($offset_will_be, $offset_want) = @_;
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my $offset_is = eval $offset_will_be;
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unless ($offset_is == $offset_want) {
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print "# bad offset $offset_is, want $offset_want\n";
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my ($offset_func) = ($offset_will_be =~ /^(\w+)/);
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if (unpack("L", pack("L", $offset_want)) == $offset_is) {
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print "# 32-bit wraparound suspected in $offset_func() since\n";
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print "# $offset_want cast into 32 bits equals $offset_is.\n";
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} elsif ($offset_want - unpack("L", pack("L", $offset_want)) - 1
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== $offset_is) {
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print "# 32-bit wraparound suspected in $offset_func() since\n";
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printf "# %s - unpack('L', pack('L', %s)) - 1 equals %s.\n",
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$offset_want,
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$offset_want,
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$offset_is;
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}
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fail;
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}
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}
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print "1..17\n";
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$fail = 0;
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fail unless $s[7] == 5_000_000_003; # exercizes pp_stat
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print "ok 1\n";
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fail unless -s "big" == 5_000_000_003; # exercizes pp_ftsize
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print "ok 2\n";
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fail unless -e "big";
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print "ok 3\n";
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fail unless -f "big";
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print "ok 4\n";
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sysopen(BIG, "big", O_RDONLY) or do { warn "sysopen failed: $!\n"; bye };
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offset('sysseek(BIG, 4_500_000_000, SEEK_SET)', 4_500_000_000);
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print "ok 5\n";
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offset('sysseek(BIG, 0, SEEK_CUR)', 4_500_000_000);
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print "ok 6\n";
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offset('sysseek(BIG, 1, SEEK_CUR)', 4_500_000_001);
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print "ok 7\n";
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offset('sysseek(BIG, 0, SEEK_CUR)', 4_500_000_001);
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print "ok 8\n";
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offset('sysseek(BIG, -1, SEEK_CUR)', 4_500_000_000);
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print "ok 9\n";
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offset('sysseek(BIG, 0, SEEK_CUR)', 4_500_000_000);
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print "ok 10\n";
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offset('sysseek(BIG, -3, SEEK_END)', 5_000_000_000);
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print "ok 11\n";
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offset('sysseek(BIG, 0, SEEK_CUR)', 5_000_000_000);
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print "ok 12\n";
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my $big;
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fail unless sysread(BIG, $big, 3) == 3;
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print "ok 13\n";
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fail unless $big eq "big";
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print "ok 14\n";
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# 705_032_704 = (I32)5_000_000_000
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# See that we don't have "big" in the 705_... spot:
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# that would mean that we have a wraparound.
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fail unless sysseek(BIG, 705_032_704, SEEK_SET);
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print "ok 15\n";
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my $zero;
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fail unless read(BIG, $zero, 3) == 3;
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print "ok 16\n";
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fail unless $zero eq "\0\0\0";
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print "ok 17\n";
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explain() if $fail;
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bye(); # does the necessary cleanup
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END {
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unlink "big"; # be paranoid about leaving 5 gig files lying around
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}
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# eof
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