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.
8 require Config; import Config;
9 # Don't bother if there are no quad offsets.
10 if ($Config{lseeksize} < 8) {
11 print "1..0 # Skip: no 64-bit file offsets\n";
14 require Fcntl; import Fcntl qw(/^O_/ /^SEEK_/);
37 unless ($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.
55 print "1..0 # Skip: @_\n" if @_;
58 print "# checking whether we have sparse files...\n";
61 if ($^O eq 'MSWin32' || $^O eq 'VMS') {
62 print "1..0 # Skip: no sparse files in $^O\n";
66 # Known haves that have problems running this test
67 # (for example because they do not support sparse files, like UNICOS)
68 if ($^O eq 'unicos') {
69 print "1..0 # Skip: no sparse files in $^0, unable to test large files\n";
73 # Then try heuristically to deduce whether we have sparse files.
75 # We'll start off by creating a one megabyte file which has
76 # only three "true" bytes. If we have sparseness, we should
77 # consume less blocks than one megabyte (assuming nobody has
78 # one megabyte blocks...)
80 sysopen(BIG, "big1", O_WRONLY|O_CREAT|O_TRUNC) or
81 do { warn "sysopen big1 failed: $!\n"; bye };
82 sysseek(BIG, 1_000_000, SEEK_SET) or
83 do { warn "sysseek big1 failed: $!\n"; bye };
84 syswrite(BIG, "big") or
85 do { warn "syswrite big1 failed; $!\n"; bye };
87 do { warn "close big1 failed: $!\n"; bye };
89 my @s1 = stat("big1");
93 sysopen(BIG, "big2", O_WRONLY|O_CREAT|O_TRUNC) or
94 do { warn "sysopen big2 failed: $!\n"; bye };
95 sysseek(BIG, 2_000_000, SEEK_SET) or
96 do { warn "sysseek big2 failed: $!\n"; bye };
97 syswrite(BIG, "big") or
98 do { warn "syswrite big2 failed; $!\n"; bye };
100 do { warn "close big2 failed: $!\n"; bye };
102 my @s2 = stat("big2");
104 print "# s2 = @s2\n";
108 unless ($s1[7] == 1_000_003 && $s2[7] == 2_000_003 &&
109 $s1[11] == $s2[11] && $s1[12] == $s2[12]) {
110 print "1..0 # Skip: no sparse files?\n";
114 print "# we seem to have sparse files...\n";
116 # By now we better be sure that we do have sparse files:
117 # if we are not, the following will hog 5 gigabytes of disk. Ooops.
118 # This may fail by producing some signal; run in a subprocess first for safety
122 my $r = system '../perl', '-I../lib', '-e', <<'EOF';
123 use Fcntl qw(/^O_/ /^SEEK_/);
124 sysopen(BIG, "big", O_WRONLY|O_CREAT|O_TRUNC) or die $!;
125 my $sysseek = sysseek(BIG, 5_000_000_000, SEEK_SET);
126 my $syswrite = syswrite(BIG, "big");
130 sysopen(BIG, "big", O_WRONLY|O_CREAT|O_TRUNC) or
131 do { warn "sysopen 'big' failed: $!\n"; bye };
132 my $sysseek = sysseek(BIG, 5_000_000_000, SEEK_SET);
133 unless (! $r && defined $sysseek && $sysseek == 5_000_000_000) {
134 $sysseek = 'undef' unless defined $sysseek;
135 explain("seeking past 2GB failed: ",
136 $r ? 'signal '.($r & 0x7f) : "$! (sysseek returned $sysseek)");
140 # The syswrite will fail if there are are filesize limitations (process or fs).
141 my $syswrite = syswrite(BIG, "big");
142 print "# syswrite failed: $! (syswrite returned ",
143 defined $syswrite ? $syswrite : 'undef', ")\n"
144 unless defined $syswrite && $syswrite == 3;
145 my $close = close BIG;
146 print "# close failed: $!\n" unless $close;
147 unless($syswrite && $close) {
148 if ($! =~/too large/i) {
149 explain("writing past 2GB failed: process limits?");
150 } elsif ($! =~ /quota/i) {
151 explain("filesystem quota limits?");
153 explain("error: $!");
162 unless ($s[7] == 5_000_000_003) {
163 explain("kernel/fs not configured to use large files?");
173 my ($offset_will_be, $offset_want) = @_;
174 my $offset_is = eval $offset_will_be;
175 unless ($offset_is == $offset_want) {
176 print "# bad offset $offset_is, want $offset_want\n";
177 my ($offset_func) = ($offset_will_be =~ /^(\w+)/);
178 if (unpack("L", pack("L", $offset_want)) == $offset_is) {
179 print "# 32-bit wraparound suspected in $offset_func() since\n";
180 print "# $offset_want cast into 32 bits equals $offset_is.\n";
181 } elsif ($offset_want - unpack("L", pack("L", $offset_want)) - 1
183 print "# 32-bit wraparound suspected in $offset_func() since\n";
184 printf "# %s - unpack('L', pack('L', %s)) - 1 equals %s.\n",
197 fail unless $s[7] == 5_000_000_003; # exercizes pp_stat
200 fail unless -s "big" == 5_000_000_003; # exercizes pp_ftsize
203 fail unless -e "big";
206 fail unless -f "big";
209 sysopen(BIG, "big", O_RDONLY) or do { warn "sysopen failed: $!\n"; bye };
211 offset('sysseek(BIG, 4_500_000_000, SEEK_SET)', 4_500_000_000);
214 offset('sysseek(BIG, 0, SEEK_CUR)', 4_500_000_000);
217 offset('sysseek(BIG, 1, SEEK_CUR)', 4_500_000_001);
220 offset('sysseek(BIG, 0, SEEK_CUR)', 4_500_000_001);
223 offset('sysseek(BIG, -1, SEEK_CUR)', 4_500_000_000);
226 offset('sysseek(BIG, 0, SEEK_CUR)', 4_500_000_000);
229 offset('sysseek(BIG, -3, SEEK_END)', 5_000_000_000);
232 offset('sysseek(BIG, 0, SEEK_CUR)', 5_000_000_000);
237 fail unless sysread(BIG, $big, 3) == 3;
240 fail unless $big eq "big";
243 # 705_032_704 = (I32)5_000_000_000
244 # See that we don't have "big" in the 705_... spot:
245 # that would mean that we have a wraparound.
246 fail unless sysseek(BIG, 705_032_704, SEEK_SET);
251 fail unless read(BIG, $zero, 3) == 3;
254 fail unless $zero eq "\0\0\0";
259 bye(); # does the necessary cleanup
262 unlink "big"; # be paranoid about leaving 5 gig files lying around