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.
56 print "1..0 # Skip: @_\n" if @_;
61 print "# checking whether we have sparse files...\n";
64 if ($^O eq 'MSWin32' || $^O eq 'NetWare' || $^O eq 'VMS') {
65 print "1..0 # Skip: no sparse files in $^O\n";
69 # Known haves that have problems running this test
70 # (for example because they do not support sparse files, like UNICOS)
71 if ($^O eq 'unicos') {
72 print "1..0 # Skip: no sparse files in $^O, unable to test large files\n";
76 # Then try to heuristically deduce whether we have sparse files.
78 # Let's not depend on Fcntl or any other extension.
80 my ($SEEK_SET, $SEEK_CUR, $SEEK_END) = (0, 1, 2);
82 # We'll start off by creating a one megabyte file which has
83 # only three "true" bytes. If we have sparseness, we should
84 # consume less blocks than one megabyte (assuming nobody has
85 # one megabyte blocks...)
87 open(BIG, ">$big1") or
88 do { warn "open $big1 failed: $!\n"; bye };
90 do { warn "binmode $big1 failed: $!\n"; bye };
91 seek(BIG, 1_000_000, $SEEK_SET) or
92 do { warn "seek $big1 failed: $!\n"; bye };
94 do { warn "print $big1 failed: $!\n"; bye };
96 do { warn "close $big1 failed: $!\n"; bye };
100 print "# s1 = @s1\n";
102 open(BIG, ">$big2") or
103 do { warn "open $big2 failed: $!\n"; bye };
105 do { warn "binmode $big2 failed: $!\n"; bye };
106 seek(BIG, 2_000_000, $SEEK_SET) or
107 do { warn "seek $big2 failed; $!\n"; bye };
109 do { warn "print $big2 failed; $!\n"; bye };
111 do { warn "close $big2 failed; $!\n"; bye };
113 my @s2 = stat($big2);
115 print "# s2 = @s2\n";
119 unless ($s1[7] == 1_000_003 && $s2[7] == 2_000_003 &&
120 $s1[11] == $s2[11] && $s1[12] == $s2[12] &&
122 print "1..0 # Skip: no sparse files?\n";
126 print "# we seem to have sparse files...\n";
128 # By now we better be sure that we do have sparse files:
129 # if we are not, the following will hog 5 gigabytes of disk. Ooops.
130 # This may fail by producing some signal; run in a subprocess first for safety
134 my $r = system '../perl', '-e', <<'EOF';
136 seek(BIG, 5_000_000_000, 0);
141 open(BIG, ">$big0") or do { warn "open failed: $!\n"; bye };
143 if ($r or not seek(BIG, 5_000_000_000, $SEEK_SET)) {
144 my $err = $r ? 'signal '.($r & 0x7f) : $!;
145 explain("seeking past 2GB failed: $err");
149 # Either the print or (more likely, thanks to buffering) the close will
150 # fail if there are are filesize limitations (process or fs).
151 my $print = print BIG "big";
152 print "# print failed: $!\n" unless $print;
153 my $close = close BIG;
154 print "# close failed: $!\n" unless $close;
155 unless ($print && $close) {
156 if ($! =~/too large/i) {
157 explain("writing past 2GB failed: process limits?");
158 } elsif ($! =~ /quota/i) {
159 explain("filesystem quota limits?");
161 explain("error: $!");
170 unless ($s[7] == 5_000_000_003) {
171 explain("kernel/fs not configured to use large files?");
181 my ($offset_will_be, $offset_want) = @_;
182 my $offset_is = eval $offset_will_be;
183 unless ($offset_is == $offset_want) {
184 print "# bad offset $offset_is, want $offset_want\n";
185 my ($offset_func) = ($offset_will_be =~ /^(\w+)/);
186 if (unpack("L", pack("L", $offset_want)) == $offset_is) {
187 print "# 32-bit wraparound suspected in $offset_func() since\n";
188 print "# $offset_want cast into 32 bits equals $offset_is.\n";
189 } elsif ($offset_want - unpack("L", pack("L", $offset_want)) - 1
191 print "# 32-bit wraparound suspected in $offset_func() since\n";
192 printf "# %s - unpack('L', pack('L', %s)) - 1 equals %s.\n",
205 fail unless $s[7] == 5_000_000_003; # exercizes pp_stat
208 fail unless -s $big0 == 5_000_000_003; # exercizes pp_ftsize
211 fail unless -e $big0;
214 fail unless -f $big0;
217 open(BIG, $big0) or do { warn "open failed: $!\n"; bye };
220 fail unless seek(BIG, 4_500_000_000, $SEEK_SET);
223 offset('tell(BIG)', 4_500_000_000);
226 fail unless seek(BIG, 1, $SEEK_CUR);
229 # If you get 205_032_705 from here it means that
230 # your tell() is returning 32-bit values since (I32)4_500_000_001
231 # is exactly 205_032_705.
232 offset('tell(BIG)', 4_500_000_001);
235 fail unless seek(BIG, -1, $SEEK_CUR);
238 offset('tell(BIG)', 4_500_000_000);
241 fail unless seek(BIG, -3, $SEEK_END);
244 offset('tell(BIG)', 5_000_000_000);
249 fail unless read(BIG, $big, 3) == 3;
252 fail unless $big eq "big";
255 # 705_032_704 = (I32)5_000_000_000
256 # See that we don't have "big" in the 705_... spot:
257 # that would mean that we have a wraparound.
258 fail unless seek(BIG, 705_032_704, $SEEK_SET);
263 fail unless read(BIG, $zero, 3) == 3;
266 fail unless $zero eq "\0\0\0";
271 bye(); # does the necessary cleanup
274 # unlink may fail if applied directly to a large file
275 # be paranoid about leaving 5 gig files lying around
276 open(BIG, ">$big0"); # truncate