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 $q = pack "q", 0 };
9 print "1..0\n# no 64-bit types\n";
13 unshift @INC, '../lib';
23 if ($^O eq 'win32' || $^O eq 'vms') {
24 print "1..0\n# no sparse files\n";
28 # Then try to deduce whether we have sparse files.
30 my ($SEEK_SET, $SEEK_CUR, $SEEK_END) = (0, 1, 2);
32 # We'll start off by creating a one megabyte file which has
33 # only three "true" bytes. If we have sparseness, we should
34 # consume less blocks than one megabyte (assuming nobody has
35 # one megabyte blocks...)
37 open(BIG, ">big") or do { warn "open failed: $!\n"; bye };
39 seek(BIG, 1_000_000, $SEEK_SET);
53 $s[11] * $s[12] < 1000_003) {
54 print "1..0\n# no sparse files?\n";
58 # By now we better be sure that we do have sparse files:
59 # if we are not, the following will hog 5 gigabytes of disk. Ooops.
65 open(BIG, ">big") or do { warn "open failed: $!\n"; bye };
67 seek(BIG, 5_000_000_000, $SEEK_SET);
80 fail unless $s[7] == 5_000_000_003;
83 fail unless -s "big" == 5_000_000_003;
86 open(BIG, "big") or do { warn "open failed: $!\n"; bye };
89 seek(BIG, 4_500_000_000, $SEEK_SET);
91 fail unless tell(BIG) == 4_500_000_000;
94 seek(BIG, 1, $SEEK_CUR);
96 fail unless tell(BIG) == 4_500_000_001;
99 seek(BIG, -1, $SEEK_CUR);
101 fail unless tell(BIG) == 4_500_000_000;
104 seek(BIG, -3, $SEEK_END);
106 fail unless tell(BIG) == 5_000_000_000;
111 fail unless read(BIG, $big, 3) == 3;
114 fail unless $big eq "big";
122 # If the lfs (large file support) tests fail, it means that
123 # the *file system* you are running the tests on doesn't support
124 # large files (files larger than two gigabytes). Perl may still
125 # be able to support such files, once you have such a file system.