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 ($Config{lseeksize} < 8) {
11 print "1..0 # Skip: no 64-bit file offsets\n";
36 unless ($explained++) {
39 # If the lfs (large file support: large meaning larger than two
40 # gigabytes) tests are skipped or fail, it may mean either that your
41 # process (or process group) is not allowed to write large files
42 # (resource limits) or that the file system (the network filesystem?)
43 # you are running the tests on doesn't let your user/group have large
44 # files (quota) or the filesystem simply doesn't support large files.
45 # You may even need to reconfigure your kernel. (This is all very
46 # operating system and site-dependent.)
48 # Perl may still be able to support large files, once you have
49 # such a process, enough quota, and such a (file) system.
50 # It is just that the test failed now.
54 print "1..0 # Skip: @_\n" if @_;
59 print "# checking whether we have sparse files...\n";
62 if ($^O eq 'MSWin32' || $^O eq 'NetWare' || $^O eq 'VMS') {
63 print "1..0 # Skip: no sparse files in $^O\n";
67 # Known haves that have problems running this test
68 # (for example because they do not support sparse files, like UNICOS)
69 if ($^O eq 'unicos') {
70 print "1..0 # Skip: no sparse files in $^O, unable to test large files\n";
74 # Then try to heuristically deduce whether we have sparse files.
76 # Let's not depend on Fcntl or any other extension.
78 my ($SEEK_SET, $SEEK_CUR, $SEEK_END) = (0, 1, 2);
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...)
86 do { warn "open big1 failed: $!\n"; bye };
88 do { warn "binmode big1 failed: $!\n"; bye };
89 seek(BIG, 1_000_000, $SEEK_SET) or
90 do { warn "seek big1 failed: $!\n"; bye };
92 do { warn "print big1 failed: $!\n"; bye };
94 do { warn "close big1 failed: $!\n"; bye };
96 my @s1 = stat("big1");
100 open(BIG, ">big2") or
101 do { warn "open big2 failed: $!\n"; bye };
103 do { warn "binmode big2 failed: $!\n"; bye };
104 seek(BIG, 2_000_000, $SEEK_SET) or
105 do { warn "seek big2 failed; $!\n"; bye };
107 do { warn "print big2 failed; $!\n"; bye };
109 do { warn "close big2 failed; $!\n"; bye };
111 my @s2 = stat("big2");
113 print "# s2 = @s2\n";
117 unless ($s1[7] == 1_000_003 && $s2[7] == 2_000_003 &&
118 $s1[11] == $s2[11] && $s1[12] == $s2[12]) {
119 print "1..0 # Skip: no sparse files?\n";
123 print "# we seem to have sparse files...\n";
125 # By now we better be sure that we do have sparse files:
126 # if we are not, the following will hog 5 gigabytes of disk. Ooops.
127 # This may fail by producing some signal; run in a subprocess first for safety
131 my $r = system '../perl', '-e', <<'EOF';
133 seek(BIG, 5_000_000_000, 0);
138 open(BIG, ">big") or do { warn "open failed: $!\n"; bye };
140 if ($r or not seek(BIG, 5_000_000_000, $SEEK_SET)) {
141 my $err = $r ? 'signal '.($r & 0x7f) : $!;
142 explain("seeking past 2GB failed: $err");
146 # Either the print or (more likely, thanks to buffering) the close will
147 # fail if there are are filesize limitations (process or fs).
148 my $print = print BIG "big";
149 print "# print failed: $!\n" unless $print;
150 my $close = close BIG;
151 print "# close failed: $!\n" unless $close;
152 unless ($print && $close) {
153 if ($! =~/too large/i) {
154 explain("writing past 2GB failed: process limits?");
155 } elsif ($! =~ /quota/i) {
156 explain("filesystem quota limits?");
158 explain("error: $!");
167 unless ($s[7] == 5_000_000_003) {
168 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 "big" == 5_000_000_003; # exercizes pp_ftsize
208 fail unless -e "big";
211 fail unless -f "big";
214 open(BIG, "big") 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, ">big"); # truncate
275 1 while unlink "big"; # standard portable idiom