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 ($Config{lseeksize} < 8) {
11 print "1..0 # Skip: no 64-bit file offsets\n";
14 require Fcntl; import Fcntl qw(/^O_/ /^SEEK_/);
36 unless ($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 @_;
57 print "# checking whether we have sparse files...\n";
60 if ($^O eq 'MSWin32' || $^O eq 'VMS') {
61 print "1..0 # Skip: no sparse files in $^O\n";
65 # Known haves that have problems running this test
66 # (for example because they do not support sparse files, like UNICOS)
67 if ($^O eq 'unicos') {
68 print "1..0 # Skip: no sparse files in $^0, unable to test large files\n";
72 # Then try heuristically to deduce whether we have sparse files.
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 sysopen(BIG, "big1", O_WRONLY|O_CREAT|O_TRUNC) or
80 do { warn "sysopen big1 failed: $!\n"; bye };
81 sysseek(BIG, 1_000_000, SEEK_SET) or
82 do { warn "sysseek big1 failed: $!\n"; bye };
83 syswrite(BIG, "big") or
84 do { warn "syswrite big1 failed; $!\n"; bye };
86 do { warn "close big1 failed: $!\n"; bye };
88 my @s1 = stat("big1");
92 sysopen(BIG, "big2", O_WRONLY|O_CREAT|O_TRUNC) or
93 do { warn "sysopen big2 failed: $!\n"; bye };
94 sysseek(BIG, 2_000_000, SEEK_SET) or
95 do { warn "sysseek big2 failed: $!\n"; bye };
96 syswrite(BIG, "big") or
97 do { warn "syswrite big2 failed; $!\n"; bye };
99 do { warn "close big2 failed: $!\n"; bye };
101 my @s2 = stat("big2");
103 print "# s2 = @s2\n";
107 unless ($s1[7] == 1_000_003 && $s2[7] == 2_000_003 &&
108 $s1[11] == $s2[11] && $s1[12] == $s2[12]) {
109 print "1..0 # Skip: no sparse files?\n";
113 print "# we seem to have sparse files...\n";
115 # By now we better be sure that we do have sparse files:
116 # if we are not, the following will hog 5 gigabytes of disk. Ooops.
117 # This may fail by producing some signal; run in a subprocess first for safety
121 my $r = system '../perl', '-I../lib', '-e', <<'EOF';
122 use Fcntl qw(/^O_/ /^SEEK_/);
123 sysopen(BIG, "big", O_WRONLY|O_CREAT|O_TRUNC) or die $!;
124 my $sysseek = sysseek(BIG, 5_000_000_000, SEEK_SET);
125 my $syswrite = syswrite(BIG, "big");
129 sysopen(BIG, "big", O_WRONLY|O_CREAT|O_TRUNC) or
130 do { warn "sysopen 'big' failed: $!\n"; bye };
131 my $sysseek = sysseek(BIG, 5_000_000_000, SEEK_SET);
132 unless (! $r && defined $sysseek && $sysseek == 5_000_000_000) {
133 $sysseek = 'undef' unless defined $sysseek;
134 explain("seeking past 2GB failed: ",
135 $r ? 'signal '.($r & 0x7f) : "$! (sysseek returned $sysseek)");
139 # The syswrite will fail if there are are filesize limitations (process or fs).
140 my $syswrite = syswrite(BIG, "big");
141 print "# syswrite failed: $! (syswrite returned ",
142 defined $syswrite ? $syswrite : 'undef', ")\n"
143 unless defined $syswrite && $syswrite == 3;
144 my $close = close BIG;
145 print "# close failed: $!\n" unless $close;
146 unless($syswrite && $close) {
147 if ($! =~/too large/i) {
148 explain("writing past 2GB failed: process limits?");
149 } elsif ($! =~ /quota/i) {
150 explain("filesystem quota limits?");
152 explain("error: $!");
161 unless ($s[7] == 5_000_000_003) {
162 explain("kernel/fs not configured to use large files?");
172 my ($offset_will_be, $offset_want) = @_;
173 my $offset_is = eval $offset_will_be;
174 unless ($offset_is == $offset_want) {
175 print "# bad offset $offset_is, want $offset_want\n";
176 if (unpack("L", pack("L", $offset_want)) == $offset_is) {
177 my($offset_func) = ($offset_will_be =~ /^(\w+)/);
178 print "# 32-bit wraparound suspected in $offset_func() since\n";
179 print "# $offset_want cast into 32 bits is $offset_is.\n";
180 } elsif ($offset_want - unpack("L", pack("L", $offset_want)) - 1
182 my($offset_func) = ($offset_will_be =~ /^(\w+)/);
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