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.
6 # Don't bother if there are no quads.
7 eval { my $q = pack "q", 0 };
9 print "1..0\n# no 64-bit types\n";
13 unshift @INC, '../lib';
14 # Don't bother if there are no quad offsets.
15 require Config; import Config;
16 if ($Config{lseeksize} < 8) {
17 print "1..0\n# no 64-bit file offsets\n";
31 # If the lfs (large file support: large meaning larger than two gigabytes)
32 # tests are skipped or fail, it may mean either that your process is not
33 # allowed to write large files or that the file system you are running
34 # the tests on doesn't support large files, or both. You may also need
35 # to reconfigure your kernel. (This is all very system-dependent.)
37 # Perl may still be able to support large files, once you have
38 # such a process and such a (file) system.
44 if ($^O eq 'win32' || $^O eq 'vms') {
45 print "1..0\n# no sparse files\n";
49 # Then try to deduce whether we have sparse files.
51 # Let's not depend on Fcntl or any other extension.
53 my ($SEEK_SET, $SEEK_CUR, $SEEK_END) = (0, 1, 2);
55 # We'll start off by creating a one megabyte file which has
56 # only three "true" bytes. If we have sparseness, we should
57 # consume less blocks than one megabyte (assuming nobody has
58 # one megabyte blocks...)
60 open(BIG, ">big") or do { warn "open failed: $!\n"; bye };
62 seek(BIG, 1_000_000, $SEEK_SET);
72 my $BLOCKSIZE = 512; # is this really correct everywhere?
77 $BLOCKSIZE * $s[12] < 1_000_003) {
78 print "1..0\n# no sparse files?\n";
82 # By now we better be sure that we do have sparse files:
83 # if we are not, the following will hog 5 gigabytes of disk. Ooops.
85 open(BIG, ">big") or do { warn "open failed: $!\n"; bye };
87 seek(BIG, 5_000_000_000, $SEEK_SET);
88 # Either the print or (more likely, thanks to buffering) the close will
89 # fail if there are are filesize limitations (process or fs).
90 my $print = print BIG "big";
91 my $close = close BIG if $print;
92 unless ($print && $close) {
94 if ($! =~/File too large/) {
95 print "1..0\n# writing past 2GB failed\n";
114 fail unless $s[7] == 5_000_000_003; # exercizes pp_stat
117 fail unless -s "big" == 5_000_000_003; # exercizes pp_ftsize
120 open(BIG, "big") or do { warn "open failed: $!\n"; bye };
123 seek(BIG, 4_500_000_000, $SEEK_SET);
125 fail unless tell(BIG) == 4_500_000_000;
128 seek(BIG, 1, $SEEK_CUR);
130 fail unless tell(BIG) == 4_500_000_001;
133 seek(BIG, -1, $SEEK_CUR);
135 fail unless tell(BIG) == 4_500_000_000;
138 seek(BIG, -3, $SEEK_END);
140 fail unless tell(BIG) == 5_000_000_000;
145 fail unless read(BIG, $big, 3) == 3;
148 fail unless $big eq "big";