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[perl5.git] / t / lib / syslfs.t
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1# NOTE: this file tests how large files (>2GB) work with raw system IO.
2# open(), tell(), seek(), print(), read() are tested in t/op/lfs.t.
3# If you modify/add tests here, remember to update also t/op/lfs.t.
4
5BEGIN {
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6 chdir 't' if -d 't';
7 unshift @INC, '../lib';
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8 require Config; import Config;
9 # Don't bother if there are no quad offsets.
10 if ($Config{lseeksize} < 8) {
64215065 11 print "1..0\n# no 64-bit file offsets\n";
48ea9154 12 exit(0);
9f8fdb7d 13 }
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14 require Fcntl; import Fcntl;
15}
16
17sub bye {
18 close(BIG);
19 unlink "big";
20 exit(0);
21}
22
fcbfa962 23sub explain {
2d4389e4 24 print <<EOM;
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25#
26# If the lfs (large file support: large meaning larger than two gigabytes)
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27# tests are skipped or fail, it may mean either that your process
28# (or process group) is not allowed to write large files (resource
29# limits) or that the file system you are running the tests on doesn't
30# let your user/group have large files (quota) or the filesystem simply
31# doesn't support large files. You may even need to reconfigure your kernel.
32# (This is all very operating system and site-dependent.)
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33#
34# Perl may still be able to support large files, once you have
eed7fde4 35# such a process, enough quota, and such a (file) system.
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36#
37EOM
38}
39
05f8a9f5 40# Known have-nots.
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41if ($^O eq 'win32' || $^O eq 'vms') {
42 print "1..0\n# no sparse files\n";
43 bye();
44}
45
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46# Known haves that have problems running this test
47# (for example because they do not support sparse files, like UNICOS)
48if ($^O eq 'unicos') {
49 print "1..0\n# large files known to work but unable to test them here\n";
50 bye();
51}
52
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53# Then try to deduce whether we have sparse files.
54
ea2b5ef6 55# We'll start off by creating a one megabyte file which has
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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...)
ea2b5ef6 59
cc4466b7 60sysopen(BIG, "big", O_WRONLY|O_CREAT|O_TRUNC) or
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61 do { warn "sysopen failed: $!\n"; bye };
62sysseek(BIG, 1_000_000, SEEK_SET);
63syswrite(BIG, "big");
64close(BIG);
65
66my @s;
67
68@s = stat("big");
69
70print "# @s\n";
71
2ef4205b 72my $BLOCKSIZE = $s[11] || 512;
5cec1e3b 73
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74unless (@s == 13 &&
75 $s[7] == 1_000_003 &&
ea2b5ef6 76 defined $s[12] &&
5cec1e3b 77 $BLOCKSIZE * $s[12] < 1_000_003) {
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78 print "1..0\n# no sparse files?\n";
79 bye();
80}
81
82# By now we better be sure that we do have sparse files:
83# if we are not, the following will hog 5 gigabytes of disk. Ooops.
84
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85$ENV{LC_ALL} = "C";
86
cc4466b7 87sysopen(BIG, "big", O_WRONLY|O_CREAT|O_TRUNC) or
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88 do { warn "sysopen failed: $!\n"; bye };
89sysseek(BIG, 5_000_000_000, SEEK_SET);
eed7fde4 90
fcbfa962 91# The syswrite will fail if there are are filesize limitations (process or fs).
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92my $syswrite = syswrite(BIG, "big") == 3;
93my $close = close BIG if $syswrite;
94unless($syswrite && $close) {
95 unless ($syswrite) {
96 print "# syswrite failed: $!\n"
97 } else {
98 print "# close failed: $!\n"
99 }
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100 if ($! =~/too large/i) {
101 print "1..0\n# writing past 2GB failed: process limits?\n";
102 } elsif ($! =~ /quota/i) {
103 print "1..0\n# filesystem quota limits?\n";
fcbfa962 104 }
56d29690 105 explain();
eed7fde4 106 bye();
fcbfa962 107}
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108
109@s = stat("big");
110
111print "# @s\n";
112
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113unless ($s[7] == 5_000_000_003) {
114 print "1..0\n# not configured to use large files?\n";
115 explain();
116 bye();
117}
118
05f8a9f5 119sub fail () {
64215065 120 print "not ";
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121 $fail++;
122}
123
77166d51 124print "1..17\n";
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125
126my $fail = 0;
127
64215065 128fail unless $s[7] == 5_000_000_003; # exercizes pp_stat
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129print "ok 1\n";
130
64215065 131fail unless -s "big" == 5_000_000_003; # exercizes pp_ftsize
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132print "ok 2\n";
133
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134fail unless -e "big";
135print "ok 3\n";
136
137fail unless -f "big";
138print "ok 4\n";
139
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140sysopen(BIG, "big", O_RDONLY) or do { warn "sysopen failed: $!\n"; bye };
141
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142fail unless sysseek(BIG, 4_500_000_000, SEEK_SET) == 4_500_000_000;
143print "ok 5\n";
ea2b5ef6 144
05f8a9f5 145fail unless sysseek(BIG, 0, SEEK_CUR) == 4_500_000_000;
77166d51 146print "ok 6\n";
ea2b5ef6 147
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148fail unless sysseek(BIG, 1, SEEK_CUR) == 4_500_000_001;
149print "ok 7\n";
ea2b5ef6 150
05f8a9f5 151fail unless sysseek(BIG, 0, SEEK_CUR) == 4_500_000_001;
77166d51 152print "ok 8\n";
ea2b5ef6 153
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154fail unless sysseek(BIG, -1, SEEK_CUR) == 4_500_000_000;
155print "ok 9\n";
ea2b5ef6 156
05f8a9f5 157fail unless sysseek(BIG, 0, SEEK_CUR) == 4_500_000_000;
77166d51 158print "ok 10\n";
ea2b5ef6 159
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160fail unless sysseek(BIG, -3, SEEK_END) == 5_000_000_000;
161print "ok 11\n";
ea2b5ef6 162
05f8a9f5 163fail unless sysseek(BIG, 0, SEEK_CUR) == 5_000_000_000;
77166d51 164print "ok 12\n";
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165
166my $big;
167
05f8a9f5 168fail unless sysread(BIG, $big, 3) == 3;
77166d51 169print "ok 13\n";
ea2b5ef6 170
05f8a9f5 171fail unless $big eq "big";
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172print "ok 14\n";
173
174# 705_032_704 = (I32)5_000_000_000
175fail unless seek(BIG, 705_032_704, $SEEK_SET);
176print "ok 15\n";
177
178my $zero;
179
180fail unless read(BIG, $zero, 3) == 3;
181print "ok 16\n";
182
183fail unless $zero eq "\0\0\0";
184print "ok 17\n";
ea2b5ef6 185
fcbfa962 186explain if $fail;
05f8a9f5 187
77166d51 188bye(); # does the necessary cleanup
e9a694fc 189
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190END {
191 unlink "big"; # be paranoid about leaving 5 gig files lying around
192}
193
ea2b5ef6 194# eof