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[perl5.git] / ext / Fcntl / t / syslfs.t
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ea2b5ef6 1# NOTE: this file tests how large files (>2GB) work with raw system IO.
93c29725 2# stdio: open(), tell(), seek(), print(), read() is tested in t/op/lfs.t.
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3# If you modify/add tests here, remember to update also t/op/lfs.t.
4
5BEGIN {
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6 require Config; import Config;
7 # Don't bother if there are no quad offsets.
8 if ($Config{lseeksize} < 8) {
6afb513c 9 print "1..0 # Skip: no 64-bit file offsets\n";
48ea9154 10 exit(0);
9f8fdb7d 11 }
ca6e1c26 12 require Fcntl; import Fcntl qw(/^O_/ /^SEEK_/);
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13}
14
326fd4b6 15use strict;
52ece81a 16
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17$| = 1;
18
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19our @s;
20our $fail;
21
93c29725 22sub zap {
ea2b5ef6 23 close(BIG);
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24 unlink("big");
25 unlink("big1");
26 unlink("big2");
27}
28
29sub bye {
30 zap();
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31 exit(0);
32}
33
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34my $explained;
35
fcbfa962 36sub explain {
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37 unless ($explained++) {
38 print <<EOM;
fcbfa962 39#
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40# If the lfs (large file support: large meaning larger than two
41# gigabytes) tests are skipped or fail, it may mean either that your
42# process (or process group) is not allowed to write large files
43# (resource limits) or that the file system (the network filesystem?)
44# you are running the tests on doesn't let your user/group have large
45# files (quota) or the filesystem simply doesn't support large files.
46# You may even need to reconfigure your kernel. (This is all very
47# operating system and site-dependent.)
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48#
49# Perl may still be able to support large files, once you have
eed7fde4 50# such a process, enough quota, and such a (file) system.
d731b481 51# It is just that the test failed now.
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52#
53EOM
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54 }
55 print "1..0 # Skip: @_\n" if @_;
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56}
57
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58print "# checking whether we have sparse files...\n";
59
05f8a9f5 60# Known have-nots.
2986a63f 61if ($^O eq 'MSWin32' || $^O eq 'NetWare' || $^O eq 'VMS') {
86e48eb5 62 print "1..0 # Skip: no sparse files in $^O\n";
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63 bye();
64}
65
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66# Known haves that have problems running this test
67# (for example because they do not support sparse files, like UNICOS)
68if ($^O eq 'unicos') {
86e48eb5 69 print "1..0 # Skip: no sparse files in $^0, unable to test large files\n";
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70 bye();
71}
72
e0a10278 73# Then try heuristically to deduce whether we have sparse files.
05f8a9f5 74
ea2b5ef6 75# We'll start off by creating a one megabyte file which has
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76# only three "true" bytes. If we have sparseness, we should
77# consume less blocks than one megabyte (assuming nobody has
78# one megabyte blocks...)
ea2b5ef6 79
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80sysopen(BIG, "big1", O_WRONLY|O_CREAT|O_TRUNC) or
81 do { warn "sysopen big1 failed: $!\n"; bye };
82sysseek(BIG, 1_000_000, SEEK_SET) or
83 do { warn "sysseek big1 failed: $!\n"; bye };
84syswrite(BIG, "big") or
85 do { warn "syswrite big1 failed; $!\n"; bye };
86close(BIG) or
87 do { warn "close big1 failed: $!\n"; bye };
ea2b5ef6 88
93c29725 89my @s1 = stat("big1");
ea2b5ef6 90
93c29725 91print "# s1 = @s1\n";
ea2b5ef6 92
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93sysopen(BIG, "big2", O_WRONLY|O_CREAT|O_TRUNC) or
94 do { warn "sysopen big2 failed: $!\n"; bye };
95sysseek(BIG, 2_000_000, SEEK_SET) or
96 do { warn "sysseek big2 failed: $!\n"; bye };
97syswrite(BIG, "big") or
98 do { warn "syswrite big2 failed; $!\n"; bye };
99close(BIG) or
100 do { warn "close big2 failed: $!\n"; bye };
ea2b5ef6 101
93c29725 102my @s2 = stat("big2");
5cec1e3b 103
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104print "# s2 = @s2\n";
105
106zap();
107
108unless ($s1[7] == 1_000_003 && $s2[7] == 2_000_003 &&
109 $s1[11] == $s2[11] && $s1[12] == $s2[12]) {
6afb513c 110 print "1..0 # Skip: no sparse files?\n";
93c29725 111 bye;
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112}
113
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114print "# we seem to have sparse files...\n";
115
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116# By now we better be sure that we do have sparse files:
117# if we are not, the following will hog 5 gigabytes of disk. Ooops.
6afb513c 118# This may fail by producing some signal; run in a subprocess first for safety
ea2b5ef6 119
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120$ENV{LC_ALL} = "C";
121
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122my $r = system '../perl', '-I../lib', '-e', <<'EOF';
123use Fcntl qw(/^O_/ /^SEEK_/);
124sysopen(BIG, "big", O_WRONLY|O_CREAT|O_TRUNC) or die $!;
125my $sysseek = sysseek(BIG, 5_000_000_000, SEEK_SET);
126my $syswrite = syswrite(BIG, "big");
127exit 0;
128EOF
129
cc4466b7 130sysopen(BIG, "big", O_WRONLY|O_CREAT|O_TRUNC) or
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131 do { warn "sysopen 'big' failed: $!\n"; bye };
132my $sysseek = sysseek(BIG, 5_000_000_000, SEEK_SET);
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133unless (! $r && defined $sysseek && $sysseek == 5_000_000_000) {
134 $sysseek = 'undef' unless defined $sysseek;
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135 explain("seeking past 2GB failed: ",
136 $r ? 'signal '.($r & 0x7f) : "$! (sysseek returned $sysseek)");
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137 bye();
138}
eed7fde4 139
fcbfa962 140# The syswrite will fail if there are are filesize limitations (process or fs).
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141my $syswrite = syswrite(BIG, "big");
142print "# syswrite failed: $! (syswrite returned ",
143 defined $syswrite ? $syswrite : 'undef', ")\n"
144 unless defined $syswrite && $syswrite == 3;
145my $close = close BIG;
146print "# close failed: $!\n" unless $close;
eed7fde4 147unless($syswrite && $close) {
b948423f 148 if ($! =~/too large/i) {
d731b481 149 explain("writing past 2GB failed: process limits?");
b948423f 150 } elsif ($! =~ /quota/i) {
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151 explain("filesystem quota limits?");
152 } else {
153 explain("error: $!");
fcbfa962 154 }
eed7fde4 155 bye();
fcbfa962 156}
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157
158@s = stat("big");
159
160print "# @s\n";
161
ae178db1 162unless ($s[7] == 5_000_000_003) {
d731b481 163 explain("kernel/fs not configured to use large files?");
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164 bye();
165}
166
05f8a9f5 167sub fail () {
64215065 168 print "not ";
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169 $fail++;
170}
171
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172sub offset ($$) {
173 my ($offset_will_be, $offset_want) = @_;
174 my $offset_is = eval $offset_will_be;
175 unless ($offset_is == $offset_want) {
176 print "# bad offset $offset_is, want $offset_want\n";
52ece81a 177 my ($offset_func) = ($offset_will_be =~ /^(\w+)/);
326fd4b6 178 if (unpack("L", pack("L", $offset_want)) == $offset_is) {
326fd4b6 179 print "# 32-bit wraparound suspected in $offset_func() since\n";
52ece81a 180 print "# $offset_want cast into 32 bits equals $offset_is.\n";
f06a04a3 181 } elsif ($offset_want - unpack("L", pack("L", $offset_want)) - 1
52ece81a 182 == $offset_is) {
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183 print "# 32-bit wraparound suspected in $offset_func() since\n";
184 printf "# %s - unpack('L', pack('L', %s)) - 1 equals %s.\n",
185 $offset_want,
186 $offset_want,
187 $offset_is;
188 }
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189 fail;
190 }
191}
192
77166d51 193print "1..17\n";
fcbfa962 194
52ece81a 195$fail = 0;
fcbfa962 196
64215065 197fail unless $s[7] == 5_000_000_003; # exercizes pp_stat
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198print "ok 1\n";
199
64215065 200fail unless -s "big" == 5_000_000_003; # exercizes pp_ftsize
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201print "ok 2\n";
202
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203fail unless -e "big";
204print "ok 3\n";
205
206fail unless -f "big";
207print "ok 4\n";
208
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209sysopen(BIG, "big", O_RDONLY) or do { warn "sysopen failed: $!\n"; bye };
210
326fd4b6 211offset('sysseek(BIG, 4_500_000_000, SEEK_SET)', 4_500_000_000);
77166d51 212print "ok 5\n";
ea2b5ef6 213
326fd4b6 214offset('sysseek(BIG, 0, SEEK_CUR)', 4_500_000_000);
77166d51 215print "ok 6\n";
ea2b5ef6 216
326fd4b6 217offset('sysseek(BIG, 1, SEEK_CUR)', 4_500_000_001);
77166d51 218print "ok 7\n";
ea2b5ef6 219
326fd4b6 220offset('sysseek(BIG, 0, SEEK_CUR)', 4_500_000_001);
77166d51 221print "ok 8\n";
ea2b5ef6 222
326fd4b6 223offset('sysseek(BIG, -1, SEEK_CUR)', 4_500_000_000);
77166d51 224print "ok 9\n";
ea2b5ef6 225
326fd4b6 226offset('sysseek(BIG, 0, SEEK_CUR)', 4_500_000_000);
77166d51 227print "ok 10\n";
ea2b5ef6 228
326fd4b6 229offset('sysseek(BIG, -3, SEEK_END)', 5_000_000_000);
77166d51 230print "ok 11\n";
ea2b5ef6 231
326fd4b6 232offset('sysseek(BIG, 0, SEEK_CUR)', 5_000_000_000);
77166d51 233print "ok 12\n";
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234
235my $big;
236
05f8a9f5 237fail unless sysread(BIG, $big, 3) == 3;
77166d51 238print "ok 13\n";
ea2b5ef6 239
05f8a9f5 240fail unless $big eq "big";
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241print "ok 14\n";
242
243# 705_032_704 = (I32)5_000_000_000
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244# See that we don't have "big" in the 705_... spot:
245# that would mean that we have a wraparound.
a5853b9e 246fail unless sysseek(BIG, 705_032_704, SEEK_SET);
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247print "ok 15\n";
248
249my $zero;
250
251fail unless read(BIG, $zero, 3) == 3;
252print "ok 16\n";
253
254fail unless $zero eq "\0\0\0";
255print "ok 17\n";
ea2b5ef6 256
d731b481 257explain() if $fail;
05f8a9f5 258
77166d51 259bye(); # does the necessary cleanup
e9a694fc 260
290be4b1 261END {
b0d0c539 262 # unlink may fail if applied directly to a large file
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263 # be paranoid about leaving 5 gig files lying around
264 open(BIG, ">big"); # truncate
b0d0c539 265 close(BIG);
6c8d78fb 266 1 while unlink "big"; # standard portable idiom
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267}
268
ea2b5ef6 269# eof