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 $big2 = tempfile();
38 unless ($explained++) {
41 # If the lfs (large file support: large meaning larger than two
42 # gigabytes) tests are skipped or fail, it may mean either that your
43 # process (or process group) is not allowed to write large files
44 # (resource limits) or that the file system (the network filesystem?)
45 # you are running the tests on doesn't let your user/group have large
46 # files (quota) or the filesystem simply doesn't support large files.
47 # You may even need to reconfigure your kernel. (This is all very
48 # operating system and site-dependent.)
50 # Perl may still be able to support large files, once you have
51 # such a process, enough quota, and such a (file) system.
52 # It is just that the test failed now.
57 print "1..0 # Skip: @_\n";
64 print "# checking whether we have sparse files...\n";
67 if ($^O eq 'MSWin32' || $^O eq 'NetWare' || $^O eq 'VMS') {
68 print "1..0 # Skip: no sparse files in $^O\n";
72 # Known haves that have problems running this test
73 # (for example because they do not support sparse files, like UNICOS)
74 if ($^O eq 'unicos') {
75 print "1..0 # Skip: no sparse files in $^O, unable to test large files\n";
79 # Then try heuristically to deduce whether we have sparse files.
81 # Let's not depend on Fcntl or any other extension.
87 # We'll start off by creating a one megabyte file which has
88 # only three "true" bytes. If we have sparseness, we should
89 # consume less blocks than one megabyte (assuming nobody has
90 # one megabyte blocks...)
92 open(BIG, ">$big1") or
93 do { warn "open $big1 failed: $!\n"; bye };
95 do { warn "binmode $big1 failed: $!\n"; bye };
96 seek(BIG, 1_000_000, SEEK_SET) or
97 do { warn "seek $big1 failed: $!\n"; bye };
99 do { warn "print $big1 failed: $!\n"; bye };
101 do { warn "close $big1 failed: $!\n"; bye };
103 my @s1 = stat($big1);
105 print "# s1 = @s1\n";
107 open(BIG, ">$big2") or
108 do { warn "open $big2 failed: $!\n"; bye };
110 do { warn "binmode $big2 failed: $!\n"; bye };
111 seek(BIG, 2_000_000, SEEK_SET) or
112 do { warn "seek $big2 failed: $!\n"; bye };
114 do { warn "print $big2 failed: $!\n"; bye };
116 do { warn "close $big2 failed: $!\n"; bye };
118 my @s2 = stat($big2);
120 print "# s2 = @s2\n";
124 unless ($s1[7] == 1_000_003 && $s2[7] == 2_000_003 &&
125 $s1[11] == $s2[11] && $s1[12] == $s2[12] &&
127 print "1..0 # Skip: no sparse files?\n";
131 print "# we seem to have sparse files...\n";
133 # By now we better be sure that we do have sparse files:
134 # if we are not, the following will hog 5 gigabytes of disk. Ooops.
135 # This may fail by producing some signal; run in a subprocess first for safety
139 my $r = system '../perl', '-e', <<"EOF";
140 open my \$big, '>', q{$big0} or die qq{open $big0: $!};
141 seek \$big, 5_000_000_000, 0 or die qq{seek $big0: $!};
142 print \$big "big" or die qq{print $big0: $!};
143 close \$big or die qq{close $big0: $!};
147 open(BIG, ">$big0") or do { warn "open failed: $!\n"; bye };
149 if ($r or not seek(BIG, 5_000_000_000, SEEK_SET)) {
150 my $err = $r ? 'signal '.($r & 0x7f) : $!;
151 explain("seeking past 2GB failed: $err");
154 # Either the print or (more likely, thanks to buffering) the close will
155 # fail if there are are filesize limitations (process or fs).
156 my $print = print BIG "big";
157 print "# print failed: $!\n" unless $print;
158 my $close = close BIG;
159 print "# close failed: $!\n" unless $close;
160 unless ($print && $close) {
161 if ($! =~/too large/i) {
162 explain("writing past 2GB failed: process limits?");
163 } elsif ($! =~ /quota/i) {
164 explain("filesystem quota limits?");
166 explain("error: $!");
174 unless ($s[7] == 5_000_000_003) {
175 explain("kernel/fs not configured to use large files?");
184 my ($offset_will_be, $offset_want) = @_;
185 my $offset_is = eval $offset_will_be;
186 unless ($offset_is == $offset_want) {
187 print "# bad offset $offset_is, want $offset_want\n";
188 my ($offset_func) = ($offset_will_be =~ /^(\w+)/);
189 if (unpack("L", pack("L", $offset_want)) == $offset_is) {
190 print "# 32-bit wraparound suspected in $offset_func() since\n";
191 print "# $offset_want cast into 32 bits equals $offset_is.\n";
192 } elsif ($offset_want - unpack("L", pack("L", $offset_want)) - 1
194 print "# 32-bit wraparound suspected in $offset_func() since\n";
195 printf "# %s - unpack('L', pack('L', %s)) - 1 equals %s.\n",
208 fail unless $s[7] == 5_000_000_003; # exercizes pp_stat
211 fail unless -s $big0 == 5_000_000_003; # exercizes pp_ftsize
214 fail unless -e $big0;
217 fail unless -f $big0;
220 open(BIG, $big0) or do { warn "open failed: $!\n"; bye };
223 fail unless seek(BIG, 4_500_000_000, SEEK_SET);
226 offset('tell(BIG)', 4_500_000_000);
229 fail unless seek(BIG, 1, SEEK_CUR);
232 # If you get 205_032_705 from here it means that
233 # your tell() is returning 32-bit values since (I32)4_500_000_001
234 # is exactly 205_032_705.
235 offset('tell(BIG)', 4_500_000_001);
238 fail unless seek(BIG, -1, SEEK_CUR);
241 offset('tell(BIG)', 4_500_000_000);
244 fail unless seek(BIG, -3, SEEK_END);
247 offset('tell(BIG)', 5_000_000_000);
252 fail unless read(BIG, $big, 3) == 3;
255 fail unless $big eq "big";
258 # 705_032_704 = (I32)5_000_000_000
259 # See that we don't have "big" in the 705_... spot:
260 # that would mean that we have a wraparound.
261 fail unless seek(BIG, 705_032_704, SEEK_SET);
266 fail unless read(BIG, $zero, 3) == 3;
269 fail unless $zero eq "\0\0\0";
274 bye(); # does the necessary cleanup
277 # unlink may fail if applied directly to a large file
278 # be paranoid about leaving 5 gig files lying around
279 open(BIG, ">$big0"); # truncate