X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=t%2Fop%2Flfs.t;h=feee8cc9b3fb133849233e6f96bee7a9655d067b;hb=20822f61cc01ab34be1e17db483aceb9d5ec8fb7;hp=127c1a9d5a05c43fe36c79852e5116c36d965ab8;hpb=817e2dcb7794edb3b03b8670a24a536211b28b53;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/t/op/lfs.t b/t/op/lfs.t
index 127c1a9..feee8cc 100644
--- a/t/op/lfs.t
+++ b/t/op/lfs.t
@@ -1,84 +1,235 @@
+# NOTE: this file tests how large files (>2GB) work with perlio (stdio/sfio).
+# sysopen(), sysseek(), syswrite(), sysread() are tested in t/lib/syslfs.t.
+# If you modify/add tests here, remember to update also t/lib/syslfs.t.
+
 BEGIN {
-	eval { pack "q", 0 };
-	if ($@) {
-		print "1..0\n# no 64-bit types\n";
+	chdir 't' if -d 't';
+	@INC = '../lib';
+	# Don't bother if there are no quad offsets.
+	require Config; import Config;
+	if ($Config{lseeksize} < 8) {
+		print "1..0 # Skip: no 64-bit file offsets\n";
 		exit(0);
 	}
 }
 
-# First try to figure out whether we have sparse files.
+sub zap {
+    close(BIG);
+    unlink("big");
+    unlink("big1");
+    unlink("big2");
+}
 
-if ($^O eq 'win32' || $^O eq 'vms') {
-    print "1..0\n# no sparse files\n";
+sub bye {
+    zap();	
     exit(0);
 }
 
-open(BIG, ">big");
-close(BIG);
+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
+# (or process group) is not allowed to write large files (resource
+# limits) or that the file system you are running the tests on doesn't
+# let your user/group have large files (quota) or the filesystem simply
+# doesn't support large files.  You may even need to reconfigure your kernel.
+# (This is all very operating system and site-dependent.)
+#
+# Perl may still be able to support large files, once you have
+# such a process, enough quota, and such a (file) system.
+#
+EOM
+}
 
-my @s;
+print "# checking whether we have sparse files...\n";
 
-@s = stat("big");
+# Known have-nots.
+if ($^O eq 'win32' || $^O eq 'vms') {
+    print "1..0 # Skip: no sparse files (because this is $^O) \n";
+    bye();
+}
 
-unless (@s == 13 && defined $s[11] && defined $s[12]) {
-    print "1..0\n# no sparse files\n";
-    exit(0);
+# Known haves that have problems running this test
+# (for example because they do not support sparse files, like UNICOS)
+if ($^O eq 'unicos') {
+    print "1..0 # Skip: large files known to work but unable to test them here ($^O)\n";
+    bye();
+}
+
+# Then try to heuristically deduce whether we have sparse files.
+
+# Let's not depend on Fcntl or any other extension.
+
+my ($SEEK_SET, $SEEK_CUR, $SEEK_END) = (0, 1, 2);
+
+# 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...)
+
+open(BIG, ">big1") or
+    do { warn "open big1 failed: $!\n"; bye };
+binmode(BIG) or
+    do { warn "binmode big1 failed: $!\n"; bye };
+seek(BIG, 1_000_000, $SEEK_SET) or
+    do { warn "seek big1 failed: $!\n"; bye };
+print BIG "big" or
+    do { warn "print big1 failed: $!\n"; bye };
+close(BIG) or
+    do { warn "close big1 failed: $!\n"; bye };
+
+my @s1 = stat("big1");
+
+print "# s1 = @s1\n";
+
+open(BIG, ">big2") or
+    do { warn "open big2 failed: $!\n"; bye };
+binmode(BIG) or
+    do { warn "binmode big2 failed: $!\n"; bye };
+seek(BIG, 2_000_000, $SEEK_SET) or
+    do { warn "seek big2 failed; $!\n"; bye };
+print BIG "big" or
+    do { warn "print big2 failed; $!\n"; bye };
+close(BIG) or
+    do { warn "close big2 failed; $!\n"; bye };
+
+my @s2 = stat("big2");
+
+print "# s2 = @s2\n";
+
+zap();
+
+unless ($s1[7] == 1_000_003 && $s2[7] == 2_000_003 &&
+	$s1[11] == $s2[11] && $s1[12] == $s2[12]) {
+	print "1..0 # Skip: no sparse files?\n";
+	bye;
 }
 
+print "# we seem to have sparse files...\n";
+
 # 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.
+# This may fail by producing some signal; run in a subprocess first for safety
 
-print "1..8\n";
+$ENV{LC_ALL} = "C";
 
+my $r = system '../perl', '-e', <<'EOF';
 open(BIG, ">big");
-binmode BIG;
 seek(BIG, 5_000_000_000, 0);
 print BIG "big";
-close BIG;
+exit 0;
+EOF
+
+open(BIG, ">big") or do { warn "open failed: $!\n"; bye };
+binmode BIG;
+if ($r or not seek(BIG, 5_000_000_000, $SEEK_SET)) {
+    my $err = $r ? 'signal '.($r & 0x7f) : $!;
+    print "1..0 # Skip: seeking past 2GB failed: $err\n";
+    explain();
+    bye();
+}
+
+# Either the print or (more likely, thanks to buffering) the close will
+# fail if there are are filesize limitations (process or fs).
+my $print = print BIG "big";
+print "# print failed: $!\n" unless $print;
+my $close = close BIG;
+print "# close failed: $!\n" unless $close;
+unless ($print && $close) {
+    if ($! =~/too large/i) {
+	print "1..0 # Skip: writing past 2GB failed: process limits?\n";
+    } elsif ($! =~ /quota/i) {
+	print "1..0 # Skip: filesystem quota limits?\n";
+    }
+    explain();
+    bye();
+}
 
 @s = stat("big");
 
-print "not " unless $s[7] == 5_000_000_003;
+print "# @s\n";
+
+unless ($s[7] == 5_000_000_003) {
+    print "1..0 # Skip: not configured to use large files?\n";
+    explain();
+    bye();
+}
+
+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";
 
-print "not " unless -s "big" == 5_000_000_003;
+fail unless -s "big" == 5_000_000_003;	# exercizes pp_ftsize
 print "ok 2\n";
 
-open(BIG, "big");
+fail unless -e "big";
+print "ok 3\n";
+
+fail unless -f "big";
+print "ok 4\n";
+
+open(BIG, "big") or do { warn "open failed: $!\n"; bye };
 binmode BIG;
 
-seek(BIG, 4_500_000_000, 0);
+fail unless seek(BIG, 4_500_000_000, $SEEK_SET);
+print "ok 5\n";
 
-print "not " unless tell(BIG) == 4_500_000_000;
-print "ok 3\n";
+fail unless tell(BIG) == 4_500_000_000;
+print "ok 6\n";
 
-seek(BIG, 1, 1);
+fail unless seek(BIG, 1, $SEEK_CUR);
+print "ok 7\n";
 
-print "not " unless tell(BIG) == 4_500_000_001;
-print "ok 4\n";
+fail unless tell(BIG) == 4_500_000_001;
+print "ok 8\n";
 
-seek(BIG, -1, 1);
+fail unless seek(BIG, -1, $SEEK_CUR);
+print "ok 9\n";
 
-print "not " unless tell(BIG) == 4_500_000_000;
-print "ok 5\n";
+fail unless tell(BIG) == 4_500_000_000;
+print "ok 10\n";
 
-seek(BIG, -3, 2);
+fail unless seek(BIG, -3, $SEEK_END);
+print "ok 11\n";
 
-print "not " unless tell(BIG) == 5_000_000_000;
-print "ok 6\n";
+fail unless tell(BIG) == 5_000_000_000;
+print "ok 12\n";
 
 my $big;
 
-print "not " unless read(BIG, $big, 3) == 3;
-print "ok 7\n";
+fail unless read(BIG, $big, 3) == 3;
+print "ok 13\n";
 
-print "not " unless $big eq "big";
-print "ok 8\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;
 
-close(BIG);
+fail unless read(BIG, $zero, 3) == 3;
+print "ok 16\n";
 
-# Testing sysseek() and other sys*() io would be nice but for
-# the tests to be be portable they require the SEEK_* constants.
+fail unless $zero eq "\0\0\0";
+print "ok 17\n";
 
-unlink "big";
+explain if $fail;
+
+bye(); # does the necessary cleanup
+
+END {
+   unlink "big"; # be paranoid about leaving 5 gig files lying around
+}
 
+# eof