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 t/lib/syslfs.t.
8 # Don't bother if there are no quad offsets.
9 require Config; import Config;
10 if ($Config{lseeksize} < 8) {
11 print "1..0 # Skip: no 64-bit file offsets\n";
35 unless ($explained++) {
38 # If the lfs (large file support: large meaning larger than two
39 # gigabytes) tests are skipped or fail, it may mean either that your
40 # process (or process group) is not allowed to write large files
41 # (resource limits) or that the file system (the network filesystem?)
42 # you are running the tests on doesn't let your user/group have large
43 # files (quota) or the filesystem simply doesn't support large files.
44 # You may even need to reconfigure your kernel. (This is all very
45 # operating system and site-dependent.)
47 # Perl may still be able to support large files, once you have
48 # such a process, enough quota, and such a (file) system.
49 # It is just that the test failed now.
53 print "1..0 # Skip: @_\n" if @_;
56 print "# checking whether we have sparse files...\n";
59 if ($^O eq 'MSWin32' || $^O eq 'VMS') {
60 print "1..0 # Skip: no sparse files in $^O\n";
64 # Known haves that have problems running this test
65 # (for example because they do not support sparse files, like UNICOS)
66 if ($^O eq 'unicos') {
67 print "1..0 # Skip: no sparse files in $^0, unable to test large files\n";
71 # Then try to heuristically deduce whether we have sparse files.
73 # Let's not depend on Fcntl or any other extension.
75 my ($SEEK_SET, $SEEK_CUR, $SEEK_END) = (0, 1, 2);
77 # We'll start off by creating a one megabyte file which has
78 # only three "true" bytes. If we have sparseness, we should
79 # consume less blocks than one megabyte (assuming nobody has
80 # one megabyte blocks...)
83 do { warn "open big1 failed: $!\n"; bye };
85 do { warn "binmode big1 failed: $!\n"; bye };
86 seek(BIG, 1_000_000, $SEEK_SET) or
87 do { warn "seek big1 failed: $!\n"; bye };
89 do { warn "print big1 failed: $!\n"; bye };
91 do { warn "close big1 failed: $!\n"; bye };
93 my @s1 = stat("big1");
98 do { warn "open big2 failed: $!\n"; bye };
100 do { warn "binmode big2 failed: $!\n"; bye };
101 seek(BIG, 2_000_000, $SEEK_SET) or
102 do { warn "seek big2 failed; $!\n"; bye };
104 do { warn "print big2 failed; $!\n"; bye };
106 do { warn "close big2 failed; $!\n"; bye };
108 my @s2 = stat("big2");
110 print "# s2 = @s2\n";
114 unless ($s1[7] == 1_000_003 && $s2[7] == 2_000_003 &&
115 $s1[11] == $s2[11] && $s1[12] == $s2[12]) {
116 print "1..0 # Skip: no sparse files?\n";
120 print "# we seem to have sparse files...\n";
122 # By now we better be sure that we do have sparse files:
123 # if we are not, the following will hog 5 gigabytes of disk. Ooops.
124 # This may fail by producing some signal; run in a subprocess first for safety
128 my $r = system '../perl', '-e', <<'EOF';
130 seek(BIG, 5_000_000_000, 0);
135 open(BIG, ">big") or do { warn "open failed: $!\n"; bye };
137 if ($r or not seek(BIG, 5_000_000_000, $SEEK_SET)) {
138 my $err = $r ? 'signal '.($r & 0x7f) : $!;
139 explain("seeking past 2GB failed: $err");
143 # Either the print or (more likely, thanks to buffering) the close will
144 # fail if there are are filesize limitations (process or fs).
145 my $print = print BIG "big";
146 print "# print failed: $!\n" unless $print;
147 my $close = close BIG;
148 print "# close failed: $!\n" unless $close;
149 unless ($print && $close) {
150 if ($! =~/too large/i) {
151 explain("writing past 2GB failed: process limits?");
152 } elsif ($! =~ /quota/i) {
153 explain("filesystem quota limits?");
155 explain("error: $!");
164 unless ($s[7] == 5_000_000_003) {
165 explain("kernel/fs not configured to use large files?");
175 my ($offset_will_be, $offset_want) = @_;
176 my $offset_is = eval $offset_will_be;
177 unless ($offset_is == $offset_want) {
178 print "# bad offset $offset_is, want $offset_want\n";
179 if (unpack("L", pack("L", $offset_want)) == $offset_is) {
180 my($offset_func) = ($offset_will_be =~ /^(\w+)/);
181 print "# 32-bit wraparound suspected in $offset_func() since\n";
182 print "# $offset_want cast into 32 bits is $offset_is.\n";
183 } elsif ($offset_want - unpack("L", pack("L", $offset_want)) - 1
185 my($offset_func) = ($offset_will_be =~ /^(\w+)/);
186 print "# 32-bit wraparound suspected in $offset_func() since\n";
187 printf "# %s - unpack('L', pack('L', %s)) - 1 equals %s.\n",
200 fail unless $s[7] == 5_000_000_003; # exercizes pp_stat
203 fail unless -s "big" == 5_000_000_003; # exercizes pp_ftsize
206 fail unless -e "big";
209 fail unless -f "big";
212 open(BIG, "big") or do { warn "open failed: $!\n"; bye };
215 fail unless seek(BIG, 4_500_000_000, $SEEK_SET);
218 offset('tell(BIG)', 4_500_000_000);
221 fail unless seek(BIG, 1, $SEEK_CUR);
224 # If you get 205_032_705 from here it means that
225 # your tell() is returning 32-bit values since (I32)4_500_000_001
226 # is exactly 205_032_705.
227 offset('tell(BIG)', 4_500_000_001);
230 fail unless seek(BIG, -1, $SEEK_CUR);
233 offset('tell(BIG)', 4_500_000_000);
236 fail unless seek(BIG, -3, $SEEK_END);
239 offset('tell(BIG)', 5_000_000_000);
244 fail unless read(BIG, $big, 3) == 3;
247 fail unless $big eq "big";
250 # 705_032_704 = (I32)5_000_000_000
251 # See that we don't have "big" in the 705_... spot:
252 # that would mean that we have a wraparound.
253 fail unless seek(BIG, 705_032_704, $SEEK_SET);
258 fail unless read(BIG, $zero, 3) == 3;
261 fail unless $zero eq "\0\0\0";
266 bye(); # does the necessary cleanup
269 unlink "big"; # be paranoid about leaving 5 gig files lying around