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Diffstat (limited to 't/lib/syslfs.t')
| -rw-r--r-- | t/lib/syslfs.t | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/t/lib/syslfs.t b/t/lib/syslfs.t new file mode 100644 index 0000000000..4d38a8e779 --- /dev/null +++ b/t/lib/syslfs.t @@ -0,0 +1,171 @@ +# NOTE: this file tests how large files (>2GB) work with raw system IO. +# open(), tell(), seek(), print(), read() are tested in t/op/lfs.t. +# If you modify/add tests here, remember to update also t/op/lfs.t. + +BEGIN { + # Don't bother if there are no quads. + eval { my $q = pack "q", 0 }; + if ($@) { + print "1..0\n# no 64-bit types\n"; + exit(0); + } + chdir 't' if -d 't'; + unshift @INC, '../lib'; + require Config; import Config; + # Don't bother if there are no quad offsets. + if ($Config{lseeksize} < 8) { + print "1..0\n# no 64-bit file offsets\n"; + exit(0); + } + require Fcntl; import Fcntl; +} + +sub bye { + close(BIG); + unlink "big"; + exit(0); +} + +sub explain { + print <<EOM; +# +# If the lfs (large file support: large meaning larger than two gigabytes) +# tests are skipped or fail, it may mean either that your process is not +# allowed to write large files or that the file system you are running +# the tests on doesn't support large files, or both. You may also need +# to reconfigure your kernel. (This is all very system-dependent.) +# +# Perl may still be able to support large files, once you have +# such a process and such a (file) system. +# +EOM +} + +# Known have-nots. +if ($^O eq 'win32' || $^O eq 'vms') { + print "1..0\n# no sparse files\n"; + bye(); +} + +# Then try to deduce whether we have sparse files. + +# We'll start off by creating a one megabyte file which has +# only three "true" bytes. If we have sparseness, we should +# consume less blocks than one megabyte (assuming nobody has +# one megabyte blocks...) + +sysopen(BIG, "big", O_WRONLY|O_CREAT|O_TRUNC) or + do { warn "sysopen failed: $!\n"; bye }; +sysseek(BIG, 1_000_000, SEEK_SET); +syswrite(BIG, "big"); +close(BIG); + +my @s; + +@s = stat("big"); + +print "# @s\n"; + +my $BLOCKSIZE = 512; # is this really correct everywhere? + +unless (@s == 13 && + $s[7] == 1_000_003 && + defined $s[12] && + $BLOCKSIZE * $s[12] < 1_000_003) { + print "1..0\n# no sparse files?\n"; + bye(); +} + +# By now we better be sure that we do have sparse files: +# if we are not, the following will hog 5 gigabytes of disk. Ooops. + +sysopen(BIG, "big", O_WRONLY|O_CREAT|O_TRUNC) or + do { warn "sysopen failed: $!\n"; bye }; +sysseek(BIG, 5_000_000_000, SEEK_SET); +# The syswrite will fail if there are are filesize limitations (process or fs). +unless(syswrite(BIG, "big") == 3) { + $ENV{LC_ALL} = "C"; + if ($! =~/File too large/) { + print "1..0\n# writing past 2GB failed\n"; + explain(); + bye(); + } +} +close BIG; + +@s = stat("big"); + +print "# @s\n"; + +sub fail () { + print "not "; + $fail++; +} + +print "1..17\n"; + +my $fail = 0; + +fail unless $s[7] == 5_000_000_003; # exercizes pp_stat +print "ok 1\n"; + +fail unless -s "big" == 5_000_000_003; # exercizes pp_ftsize +print "ok 2\n"; + +fail unless -e "big"; +print "ok 3\n"; + +fail unless -f "big"; +print "ok 4\n"; + +sysopen(BIG, "big", O_RDONLY) or do { warn "sysopen failed: $!\n"; bye }; + +fail unless sysseek(BIG, 4_500_000_000, SEEK_SET) == 4_500_000_000; +print "ok 5\n"; + +fail unless sysseek(BIG, 0, SEEK_CUR) == 4_500_000_000; +print "ok 6\n"; + +fail unless sysseek(BIG, 1, SEEK_CUR) == 4_500_000_001; +print "ok 7\n"; + +fail unless sysseek(BIG, 0, SEEK_CUR) == 4_500_000_001; +print "ok 8\n"; + +fail unless sysseek(BIG, -1, SEEK_CUR) == 4_500_000_000; +print "ok 9\n"; + +fail unless sysseek(BIG, 0, SEEK_CUR) == 4_500_000_000; +print "ok 10\n"; + +fail unless sysseek(BIG, -3, SEEK_END) == 5_000_000_000; +print "ok 11\n"; + +fail unless sysseek(BIG, 0, SEEK_CUR) == 5_000_000_000; +print "ok 12\n"; + +my $big; + +fail unless sysread(BIG, $big, 3) == 3; +print "ok 13\n"; + +fail unless $big eq "big"; +print "ok 14\n"; + +# 705_032_704 = (I32)5_000_000_000 +fail unless seek(BIG, 705_032_704, $SEEK_SET); +print "ok 15\n"; + +my $zero; + +fail unless read(BIG, $zero, 3) == 3; +print "ok 16\n"; + +fail unless $zero eq "\0\0\0"; +print "ok 17\n"; + +explain if $fail; + +bye(); # does the necessary cleanup + +# eof |