1 # NOTE: this file tests how large files (>2GB) work with perlio (stdio/sfio).
2 # sysopen(), sysseek(), syswrite(), sysread() are tested in t/lib/syslfs.t.
3 # If you modify/add tests here, remember to update also ext/Fcntl/t/syslfs.t.
8 # Don't bother if there are no quad offsets.
9 require Config; import Config;
10 if ($Config{lseeksize} < 8) {
11 print "1..0 # Skip: no 64-bit file offsets\n";
21 my $big0 = tempfile();
22 my $big1 = tempfile();
23 my $big2 = tempfile();
28 unless ($explained++) {
31 # If the lfs (large file support: large meaning larger than two
32 # gigabytes) tests are skipped or fail, it may mean either that your
33 # process (or process group) is not allowed to write large files
34 # (resource limits) or that the file system (the network filesystem?)
35 # you are running the tests on doesn't let your user/group have large
36 # files (quota) or the filesystem simply doesn't support large files.
37 # You may even need to reconfigure your kernel. (This is all very
38 # operating system and site-dependent.)
40 # Perl may still be able to support large files, once you have
41 # such a process, enough quota, and such a (file) system.
42 # It is just that the test failed now.
53 print "# checking whether we have sparse files...\n";
56 if ($^O eq 'MSWin32' || $^O eq 'NetWare' || $^O eq 'VMS') {
57 skip_all("no sparse files in $^O");
60 # Known haves that have problems running this test
61 # (for example because they do not support sparse files, like UNICOS)
62 if ($^O eq 'unicos') {
63 skip_all("no sparse files in $^O, unable to test large files");
66 # Then try heuristically to deduce whether we have sparse files.
68 # Let's not depend on Fcntl or any other extension.
74 # We'll start off by creating a one megabyte file which has
75 # only three "true" bytes. If we have sparseness, we should
76 # consume less blocks than one megabyte (assuming nobody has
77 # one megabyte blocks...)
79 open(BIG, ">$big1") or
80 die "open $big1 failed: $!";
82 die "binmode $big1 failed: $!";
83 seek(BIG, 1_000_000, SEEK_SET) or
84 die "seek $big1 failed: $!";
86 die "print $big1 failed: $!";
88 die "close $big1 failed: $!";
94 open(BIG, ">$big2") or
95 die "open $big2 failed: $!";
97 die "binmode $big2 failed: $!";
98 seek(BIG, 2_000_000, SEEK_SET) or
99 die "seek $big2 failed: $!";
101 die "print $big2 failed: $!";
103 die "close $big2 failed: $!";
105 my @s2 = stat($big2);
107 print "# s2 = @s2\n";
109 unless ($s1[7] == 1_000_003 && $s2[7] == 2_000_003 &&
110 $s1[11] == $s2[11] && $s1[12] == $s2[12] &&
112 skip_all("no sparse files?");
115 print "# we seem to have sparse files...\n";
117 # By now we better be sure that we do have sparse files:
118 # if we are not, the following will hog 5 gigabytes of disk. Ooops.
119 # This may fail by producing some signal; run in a subprocess first for safety
123 my $r = system '../perl', '-e', <<"EOF";
124 open my \$big, '>', q{$big0} or die qq{open $big0: $!};
125 seek \$big, 5_000_000_000, 0 or die qq{seek $big0: $!};
126 print \$big "big" or die qq{print $big0: $!};
127 close \$big or die qq{close $big0: $!};
131 open(BIG, ">$big0") or die "open failed: $!";
133 if ($r or not seek(BIG, 5_000_000_000, SEEK_SET)) {
134 my $err = $r ? 'signal '.($r & 0x7f) : $!;
135 explain("seeking past 2GB failed: $err");
138 # Either the print or (more likely, thanks to buffering) the close will
139 # fail if there are are filesize limitations (process or fs).
140 my $print = print BIG "big";
141 print "# print failed: $!\n" unless $print;
142 my $close = close BIG;
143 print "# close failed: $!\n" unless $close;
144 unless ($print && $close) {
145 if ($! =~/too large/i) {
146 explain("writing past 2GB failed: process limits?");
147 } elsif ($! =~ /quota/i) {
148 explain("filesystem quota limits?");
150 explain("error: $!");
158 unless ($s[7] == 5_000_000_003) {
159 explain("kernel/fs not configured to use large files?");
163 local $::Level = $::Level + 1;
164 my ($offset_will_be, $offset_want) = @_;
165 my $offset_is = eval $offset_will_be;
166 unless ($offset_is == $offset_want) {
167 print "# bad offset $offset_is, want $offset_want\n";
168 my ($offset_func) = ($offset_will_be =~ /^(\w+)/);
169 if (unpack("L", pack("L", $offset_want)) == $offset_is) {
170 print "# 32-bit wraparound suspected in $offset_func() since\n";
171 print "# $offset_want cast into 32 bits equals $offset_is.\n";
172 } elsif ($offset_want - unpack("L", pack("L", $offset_want)) - 1
174 print "# 32-bit wraparound suspected in $offset_func() since\n";
175 printf "# %s - unpack('L', pack('L', %s)) - 1 equals %s.\n",
180 fail($offset_will_be);
182 pass($offset_will_be);
188 is($s[7], 5_000_000_003, 'exercises pp_stat');
189 is(-s $big0, 5_000_000_003, 'exercises pp_ftsize');
194 open(BIG, $big0) or die "open failed: $!";
197 isnt(seek(BIG, 4_500_000_000, SEEK_SET), undef);
199 offset('tell(BIG)', 4_500_000_000);
201 isnt(seek(BIG, 1, SEEK_CUR), undef);
203 # If you get 205_032_705 from here it means that
204 # your tell() is returning 32-bit values since (I32)4_500_000_001
205 # is exactly 205_032_705.
206 offset('tell(BIG)', 4_500_000_001);
208 isnt(seek(BIG, -1, SEEK_CUR), undef);
210 offset('tell(BIG)', 4_500_000_000);
212 isnt(seek(BIG, -3, SEEK_END), undef);
214 offset('tell(BIG)', 5_000_000_000);
218 is(read(BIG, $big, 3), 3);
222 # 705_032_704 = (I32)5_000_000_000
223 # See that we don't have "big" in the 705_... spot:
224 # that would mean that we have a wraparound.
225 isnt(seek(BIG, 705_032_704, SEEK_SET), undef);
229 is(read(BIG, $zero, 3), 3);
233 explain() unless $::Tests_Are_Passing;
236 # unlink may fail if applied directly to a large file
237 # be paranoid about leaving 5 gig files lying around
238 open(BIG, ">$big0"); # truncate