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 ($Config{lseeksize} < 8) {
11 print "1..0 # Skip: no 64-bit file offsets\n";
31 unless ($explained++) {
34 # If the lfs (large file support: large meaning larger than two
35 # gigabytes) tests are skipped or fail, it may mean either that your
36 # process (or process group) is not allowed to write large files
37 # (resource limits) or that the file system (the network filesystem?)
38 # you are running the tests on doesn't let your user/group have large
39 # files (quota) or the filesystem simply doesn't support large files.
40 # You may even need to reconfigure your kernel. (This is all very
41 # operating system and site-dependent.)
43 # Perl may still be able to support large files, once you have
44 # such a process, enough quota, and such a (file) system.
45 # It is just that the test failed now.
49 print "1..0 # Skip: @_\n" if @_;
52 print "# checking whether we have sparse files...\n";
55 if ($^O eq 'MSWin32' || $^O eq 'VMS') {
56 print "1..0 # Skip: no sparse files in $^O\n";
60 # Known haves that have problems running this test
61 # (for example because they do not support sparse files, like UNICOS)
62 if ($^O eq 'unicos') {
63 print "1..0 # Skip: no sparse files in $^0, unable to test large files\n";
67 # Then try to heuristically deduce whether we have sparse files.
69 # Let's not depend on Fcntl or any other extension.
71 my ($SEEK_SET, $SEEK_CUR, $SEEK_END) = (0, 1, 2);
73 # We'll start off by creating a one megabyte file which has
74 # only three "true" bytes. If we have sparseness, we should
75 # consume less blocks than one megabyte (assuming nobody has
76 # one megabyte blocks...)
79 do { warn "open big1 failed: $!\n"; bye };
81 do { warn "binmode big1 failed: $!\n"; bye };
82 seek(BIG, 1_000_000, $SEEK_SET) or
83 do { warn "seek big1 failed: $!\n"; bye };
85 do { warn "print big1 failed: $!\n"; bye };
87 do { warn "close big1 failed: $!\n"; bye };
89 my @s1 = stat("big1");
94 do { warn "open big2 failed: $!\n"; bye };
96 do { warn "binmode big2 failed: $!\n"; bye };
97 seek(BIG, 2_000_000, $SEEK_SET) or
98 do { warn "seek big2 failed; $!\n"; bye };
100 do { warn "print big2 failed; $!\n"; bye };
102 do { warn "close big2 failed; $!\n"; bye };
104 my @s2 = stat("big2");
106 print "# s2 = @s2\n";
110 unless ($s1[7] == 1_000_003 && $s2[7] == 2_000_003 &&
111 $s1[11] == $s2[11] && $s1[12] == $s2[12]) {
112 print "1..0 # Skip: no sparse files?\n";
116 print "# we seem to have sparse files...\n";
118 # By now we better be sure that we do have sparse files:
119 # if we are not, the following will hog 5 gigabytes of disk. Ooops.
120 # This may fail by producing some signal; run in a subprocess first for safety
124 my $r = system '../perl', '-e', <<'EOF';
126 seek(BIG, 5_000_000_000, 0);
131 open(BIG, ">big") or do { warn "open failed: $!\n"; bye };
133 if ($r or not seek(BIG, 5_000_000_000, $SEEK_SET)) {
134 my $err = $r ? 'signal '.($r & 0x7f) : $!;
135 explain("seeking past 2GB failed: $err");
139 # Either the print or (more likely, thanks to buffering) the close will
140 # fail if there are are filesize limitations (process or fs).
141 my $print = print BIG "big";
142 print "# print failed: $!\n" unless $print;
143 my $close = close BIG;
144 print "# close failed: $!\n" unless $close;
145 unless ($print && $close) {
146 if ($! =~/too large/i) {
147 explain("writing past 2GB failed: process limits?");
148 } elsif ($! =~ /quota/i) {
149 explain("filesystem quota limits?");
151 explain("error: $!");
160 unless ($s[7] == 5_000_000_003) {
161 explain("kernel/fs not configured to use large files?");
174 fail unless $s[7] == 5_000_000_003; # exercizes pp_stat
177 fail unless -s "big" == 5_000_000_003; # exercizes pp_ftsize
180 fail unless -e "big";
183 fail unless -f "big";
186 open(BIG, "big") or do { warn "open failed: $!\n"; bye };
189 fail unless seek(BIG, 4_500_000_000, $SEEK_SET);
192 fail unless tell(BIG) == 4_500_000_000;
195 fail unless seek(BIG, 1, $SEEK_CUR);
198 fail unless tell(BIG) == 4_500_000_001;
201 fail unless seek(BIG, -1, $SEEK_CUR);
204 fail unless tell(BIG) == 4_500_000_000;
207 fail unless seek(BIG, -3, $SEEK_END);
210 fail unless tell(BIG) == 5_000_000_000;
215 fail unless read(BIG, $big, 3) == 3;
218 fail unless $big eq "big";
221 # 705_032_704 = (I32)5_000_000_000
222 fail unless seek(BIG, 705_032_704, $SEEK_SET);
227 fail unless read(BIG, $zero, 3) == 3;
230 fail unless $zero eq "\0\0\0";
235 bye(); # does the necessary cleanup
238 unlink "big"; # be paranoid about leaving 5 gig files lying around