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";
22 my $big0 = tempfile();
23 my $big1 = tempfile();
24 my $big2 = tempfile();
34 unless ($explained++) {
37 # If the lfs (large file support: large meaning larger than two
38 # gigabytes) tests are skipped or fail, it may mean either that your
39 # process (or process group) is not allowed to write large files
40 # (resource limits) or that the file system (the network filesystem?)
41 # you are running the tests on doesn't let your user/group have large
42 # files (quota) or the filesystem simply doesn't support large files.
43 # You may even need to reconfigure your kernel. (This is all very
44 # operating system and site-dependent.)
46 # Perl may still be able to support large files, once you have
47 # such a process, enough quota, and such a (file) system.
48 # It is just that the test failed now.
53 print "1..0 # Skip: @_\n";
60 print "# checking whether we have sparse files...\n";
63 if ($^O eq 'MSWin32' || $^O eq 'NetWare' || $^O eq 'VMS') {
64 print "1..0 # Skip: no sparse files in $^O\n";
68 # Known haves that have problems running this test
69 # (for example because they do not support sparse files, like UNICOS)
70 if ($^O eq 'unicos') {
71 print "1..0 # Skip: no sparse files in $^O, unable to test large files\n";
75 # Then try heuristically to deduce whether we have sparse files.
77 # Let's not depend on Fcntl or any other extension.
83 # We'll start off by creating a one megabyte file which has
84 # only three "true" bytes. If we have sparseness, we should
85 # consume less blocks than one megabyte (assuming nobody has
86 # one megabyte blocks...)
88 open(BIG, ">$big1") or
89 do { warn "open $big1 failed: $!\n"; bye };
91 do { warn "binmode $big1 failed: $!\n"; bye };
92 seek(BIG, 1_000_000, SEEK_SET) or
93 do { warn "seek $big1 failed: $!\n"; bye };
95 do { warn "print $big1 failed: $!\n"; bye };
97 do { warn "close $big1 failed: $!\n"; bye };
101 print "# s1 = @s1\n";
103 open(BIG, ">$big2") or
104 do { warn "open $big2 failed: $!\n"; bye };
106 do { warn "binmode $big2 failed: $!\n"; bye };
107 seek(BIG, 2_000_000, SEEK_SET) or
108 do { warn "seek $big2 failed: $!\n"; bye };
110 do { warn "print $big2 failed: $!\n"; bye };
112 do { warn "close $big2 failed: $!\n"; bye };
114 my @s2 = stat($big2);
116 print "# s2 = @s2\n";
118 unless ($s1[7] == 1_000_003 && $s2[7] == 2_000_003 &&
119 $s1[11] == $s2[11] && $s1[12] == $s2[12] &&
121 print "1..0 # Skip: no sparse files?\n";
125 print "# we seem to have sparse files...\n";
127 # By now we better be sure that we do have sparse files:
128 # if we are not, the following will hog 5 gigabytes of disk. Ooops.
129 # This may fail by producing some signal; run in a subprocess first for safety
133 my $r = system '../perl', '-e', <<"EOF";
134 open my \$big, '>', q{$big0} or die qq{open $big0: $!};
135 seek \$big, 5_000_000_000, 0 or die qq{seek $big0: $!};
136 print \$big "big" or die qq{print $big0: $!};
137 close \$big or die qq{close $big0: $!};
141 open(BIG, ">$big0") or do { warn "open failed: $!\n"; bye };
143 if ($r or not seek(BIG, 5_000_000_000, SEEK_SET)) {
144 my $err = $r ? 'signal '.($r & 0x7f) : $!;
145 explain("seeking past 2GB failed: $err");
148 # Either the print or (more likely, thanks to buffering) the close will
149 # fail if there are are filesize limitations (process or fs).
150 my $print = print BIG "big";
151 print "# print failed: $!\n" unless $print;
152 my $close = close BIG;
153 print "# close failed: $!\n" unless $close;
154 unless ($print && $close) {
155 if ($! =~/too large/i) {
156 explain("writing past 2GB failed: process limits?");
157 } elsif ($! =~ /quota/i) {
158 explain("filesystem quota limits?");
160 explain("error: $!");
168 unless ($s[7] == 5_000_000_003) {
169 explain("kernel/fs not configured to use large files?");
178 my ($offset_will_be, $offset_want) = @_;
179 my $offset_is = eval $offset_will_be;
180 unless ($offset_is == $offset_want) {
181 print "# bad offset $offset_is, want $offset_want\n";
182 my ($offset_func) = ($offset_will_be =~ /^(\w+)/);
183 if (unpack("L", pack("L", $offset_want)) == $offset_is) {
184 print "# 32-bit wraparound suspected in $offset_func() since\n";
185 print "# $offset_want cast into 32 bits equals $offset_is.\n";
186 } elsif ($offset_want - unpack("L", pack("L", $offset_want)) - 1
188 print "# 32-bit wraparound suspected in $offset_func() since\n";
189 printf "# %s - unpack('L', pack('L', %s)) - 1 equals %s.\n",
202 fail unless $s[7] == 5_000_000_003; # exercizes pp_stat
205 fail unless -s $big0 == 5_000_000_003; # exercizes pp_ftsize
208 fail unless -e $big0;
211 fail unless -f $big0;
214 open(BIG, $big0) or do { warn "open failed: $!\n"; bye };
217 fail unless seek(BIG, 4_500_000_000, SEEK_SET);
220 offset('tell(BIG)', 4_500_000_000);
223 fail unless seek(BIG, 1, SEEK_CUR);
226 # If you get 205_032_705 from here it means that
227 # your tell() is returning 32-bit values since (I32)4_500_000_001
228 # is exactly 205_032_705.
229 offset('tell(BIG)', 4_500_000_001);
232 fail unless seek(BIG, -1, SEEK_CUR);
235 offset('tell(BIG)', 4_500_000_000);
238 fail unless seek(BIG, -3, SEEK_END);
241 offset('tell(BIG)', 5_000_000_000);
246 fail unless read(BIG, $big, 3) == 3;
249 fail unless $big eq "big";
252 # 705_032_704 = (I32)5_000_000_000
253 # See that we don't have "big" in the 705_... spot:
254 # that would mean that we have a wraparound.
255 fail unless seek(BIG, 705_032_704, SEEK_SET);
260 fail unless read(BIG, $zero, 3) == 3;
263 fail unless $zero eq "\0\0\0";
268 bye(); # does the necessary cleanup
271 # unlink may fail if applied directly to a large file
272 # be paranoid about leaving 5 gig files lying around
273 open(BIG, ">$big0"); # truncate