1 # NOTE: this file tests how large files (>2GB) work with raw system IO.
2 # stdio: open(), tell(), seek(), print(), read() is tested in t/op/lfs.t.
3 # If you modify/add tests here, remember to update also t/op/lfs.t.
6 require Config; import Config;
7 # Don't bother if there are no quad offsets.
8 if ($Config{lseeksize} < 8) {
9 print "1..0 # Skip: no 64-bit file offsets\n";
12 require Fcntl; import Fcntl qw(/^O_/ /^SEEK_/);
16 use File::Temp 'tempfile';
21 (undef, my $big0) = tempfile(UNLINK => 1);
22 (undef, my $big1) = tempfile(UNLINK => 1);
23 (undef, my $big2) = tempfile(UNLINK => 1);
37 unless ($explained++) {
40 # If the lfs (large file support: large meaning larger than two
41 # gigabytes) tests are skipped or fail, it may mean either that your
42 # process (or process group) is not allowed to write large files
43 # (resource limits) or that the file system (the network filesystem?)
44 # you are running the tests on doesn't let your user/group have large
45 # files (quota) or the filesystem simply doesn't support large files.
46 # You may even need to reconfigure your kernel. (This is all very
47 # operating system and site-dependent.)
49 # Perl may still be able to support large files, once you have
50 # such a process, enough quota, and such a (file) system.
51 # It is just that the test failed now.
56 print "1..0 # Skip: @_\n";
63 print "# checking whether we have sparse files...\n";
66 if ($^O eq 'MSWin32' || $^O eq 'NetWare' || $^O eq 'VMS') {
67 print "1..0 # Skip: no sparse files in $^O\n";
71 # Known haves that have problems running this test
72 # (for example because they do not support sparse files, like UNICOS)
73 if ($^O eq 'unicos') {
74 print "1..0 # Skip: no sparse files in $^O, unable to test large files\n";
78 # Then try heuristically to deduce whether we have sparse files.
80 # We'll start off by creating a one megabyte file which has
81 # only three "true" bytes. If we have sparseness, we should
82 # consume less blocks than one megabyte (assuming nobody has
83 # one megabyte blocks...)
85 sysopen(BIG, $big1, O_WRONLY|O_CREAT|O_TRUNC) or
86 do { warn "sysopen $big1 failed: $!\n"; bye };
87 sysseek(BIG, 1_000_000, SEEK_SET) or
88 do { warn "sysseek $big1 failed: $!\n"; bye };
89 syswrite(BIG, "big") or
90 do { warn "syswrite $big1 failed: $!\n"; bye };
92 do { warn "close $big1 failed: $!\n"; bye };
98 sysopen(BIG, $big2, O_WRONLY|O_CREAT|O_TRUNC) or
99 do { warn "sysopen $big2 failed: $!\n"; bye };
100 sysseek(BIG, 2_000_000, SEEK_SET) or
101 do { warn "sysseek $big2 failed: $!\n"; bye };
102 syswrite(BIG, "big") or
103 do { warn "syswrite $big2 failed: $!\n"; bye };
105 do { warn "close $big2 failed: $!\n"; bye };
107 my @s2 = stat($big2);
109 print "# s2 = @s2\n";
113 unless ($s1[7] == 1_000_003 && $s2[7] == 2_000_003 &&
114 $s1[11] == $s2[11] && $s1[12] == $s2[12] &&
116 print "1..0 # Skip: no sparse files?\n";
120 print "# we seem to have sparse files...\n";
122 # By now we better be sure that we do have sparse files:
123 # if we are not, the following will hog 5 gigabytes of disk. Ooops.
124 # This may fail by producing some signal; run in a subprocess first for safety
128 my $perl = '../../perl';
130 print "1..1\nnot ok 1 - can't find perl: expected $perl\n";
133 my $r = system $perl, '-I../lib', '-e', <<"EOF";
134 use Fcntl qw(/^O_/ /^SEEK_/);
135 sysopen \$big, q{$big0}, O_WRONLY|O_CREAT|O_TRUNC or die qq{sysopen $big0 $!};
136 sysseek \$big, 5_000_000_000, SEEK_SET or die qq{sysseek $big0 $!};
137 syswrite \$big, "big" or die qq{syswrite $big0 $!};
138 close \$big or die qq{close $big0: $!};
143 sysopen(BIG, $big0, O_WRONLY|O_CREAT|O_TRUNC) or
144 do { warn "sysopen $big0 failed: $!\n"; bye };
145 my $sysseek = sysseek(BIG, 5_000_000_000, SEEK_SET);
146 unless (! $r && defined $sysseek && $sysseek == 5_000_000_000) {
147 $sysseek = 'undef' unless defined $sysseek;
148 explain("seeking past 2GB failed: ",
149 $r ? 'signal '.($r & 0x7f) : "$! (sysseek returned $sysseek)");
152 # The syswrite will fail if there are are filesize limitations (process or fs).
153 my $syswrite = syswrite(BIG, "big");
154 print "# syswrite failed: $! (syswrite returned ",
155 defined $syswrite ? $syswrite : 'undef', ")\n"
156 unless defined $syswrite && $syswrite == 3;
157 my $close = close BIG;
158 print "# close failed: $!\n" unless $close;
159 unless($syswrite && $close) {
160 if ($! =~/too large/i) {
161 explain("writing past 2GB failed: process limits?");
162 } elsif ($! =~ /quota/i) {
163 explain("filesystem quota limits?");
165 explain("error: $!");
173 unless ($s[7] == 5_000_000_003) {
174 explain("kernel/fs not configured to use large files?");
183 my ($offset_will_be, $offset_want) = @_;
184 my $offset_is = eval $offset_will_be;
185 unless ($offset_is == $offset_want) {
186 print "# bad offset $offset_is, want $offset_want\n";
187 my ($offset_func) = ($offset_will_be =~ /^(\w+)/);
188 if (unpack("L", pack("L", $offset_want)) == $offset_is) {
189 print "# 32-bit wraparound suspected in $offset_func() since\n";
190 print "# $offset_want cast into 32 bits equals $offset_is.\n";
191 } elsif ($offset_want - unpack("L", pack("L", $offset_want)) - 1
193 print "# 32-bit wraparound suspected in $offset_func() since\n";
194 printf "# %s - unpack('L', pack('L', %s)) - 1 equals %s.\n",
207 fail unless $s[7] == 5_000_000_003; # exercizes pp_stat
210 fail unless -s $big0 == 5_000_000_003; # exercizes pp_ftsize
213 fail unless -e $big0;
216 fail unless -f $big0;
219 sysopen(BIG, $big0, O_RDONLY) or do { warn "sysopen failed: $!\n"; bye };
221 offset('sysseek(BIG, 4_500_000_000, SEEK_SET)', 4_500_000_000);
224 offset('sysseek(BIG, 0, SEEK_CUR)', 4_500_000_000);
227 # If you get 205_032_705 from here it means that
228 # your tell() is returning 32-bit values since (I32)4_500_000_001
229 # is exactly 205_032_705.
230 offset('sysseek(BIG, 1, SEEK_CUR)', 4_500_000_001);
233 offset('sysseek(BIG, 0, SEEK_CUR)', 4_500_000_001);
236 offset('sysseek(BIG, -1, SEEK_CUR)', 4_500_000_000);
239 offset('sysseek(BIG, 0, SEEK_CUR)', 4_500_000_000);
242 offset('sysseek(BIG, -3, SEEK_END)', 5_000_000_000);
245 offset('sysseek(BIG, 0, SEEK_CUR)', 5_000_000_000);
250 fail unless sysread(BIG, $big, 3) == 3;
253 fail unless $big eq "big";
256 # 705_032_704 = (I32)5_000_000_000
257 # See that we don't have "big" in the 705_... spot:
258 # that would mean that we have a wraparound.
259 fail unless sysseek(BIG, 705_032_704, SEEK_SET);
264 fail unless read(BIG, $zero, 3) == 3;
267 fail unless $zero eq "\0\0\0";
272 bye(); # does the necessary cleanup
275 # unlink may fail if applied directly to a large file
276 # be paranoid about leaving 5 gig files lying around
277 open(BIG, ">$big0"); # truncate