Use minimal @INC in tests, most of the time just '../lib',

[p5sagit/p5-mst-13.2.git] / t / op / lfs.t

diff --git a/t/op/lfs.t b/t/op/lfs.t
index 129752b..feee8cc 100644 (file)
--- a/t/op/lfs.t
+++ b/t/op/lfs.t
@@ -3,25 +3,25 @@
 # If you modify/add tests here, remember to update also t/lib/syslfs.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';
+       @INC = '../lib';
        # Don't bother if there are no quad offsets.
        require Config; import Config;
        if ($Config{lseeksize} < 8) {
-               print "1..0\n# no 64-bit file offsets\n";
+               print "1..0 # Skip: no 64-bit file offsets\n";
                exit(0);
        }
 }
 
-sub bye {
+sub zap {
     close(BIG);
-    unlink "big";
+    unlink("big");
+    unlink("big1");
+    unlink("big2");
+}
+
+sub bye {
+    zap();     
     exit(0);
 }
 
@@ -42,20 +42,22 @@ sub explain {
 EOM
 }
 
+print "# checking whether we have sparse files...\n";
+
 # Known have-nots.
 if ($^O eq 'win32' || $^O eq 'vms') {
-    print "1..0\n# no sparse files\n";
+    print "1..0 # Skip: no sparse files (because this is $^O) \n";
     bye();
 }
 
 # Known haves that have problems running this test
 # (for example because they do not support sparse files, like UNICOS)
 if ($^O eq 'unicos') {
-    print "1..0\n# large files known to work but unable to test them here\n";
+    print "1..0 # Skip: large files known to work but unable to test them here ($^O)\n";
     bye();
 }
 
-# Then try to deduce whether we have sparse files.
+# Then try to heuristically deduce whether we have sparse files.
 
 # Let's not depend on Fcntl or any other extension.
 
@@ -66,51 +68,79 @@ my ($SEEK_SET, $SEEK_CUR, $SEEK_END) = (0, 1, 2);
 # consume less blocks than one megabyte (assuming nobody has
 # one megabyte blocks...)
 
-open(BIG, ">big") or do { warn "open failed: $!\n"; bye };
-binmode BIG;
-seek(BIG, 1_000_000, $SEEK_SET);
-print BIG "big";
-close(BIG);
-
-my @s;
-
-@s = stat("big");
-
-print "# @s\n";
-
-my $BLOCKSIZE = $s[11] || 512;
-
-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();
+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
 
 $ENV{LC_ALL} = "C";
 
+my $r = system '../perl', '-e', <<'EOF';
+open(BIG, ">big");
+seek(BIG, 5_000_000_000, 0);
+print BIG "big";
+exit 0;
+EOF
+
 open(BIG, ">big") or do { warn "open failed: $!\n"; bye };
 binmode BIG;
-seek(BIG, 5_000_000_000, $SEEK_SET);
+if ($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";
-my $close = close BIG if $print;
+print "# print failed: $!\n" unless $print;
+my $close = close BIG;
+print "# close failed: $!\n" unless $close;
 unless ($print && $close) {
-    unless ($print) {
-        print "# print failed: $!\n"
-    } else {
-        print "# close failed: $!\n"
-    }
     if ($! =~/too large/i) {
-       print "1..0\n# writing past 2GB failed: process limits?\n";
+       print "1..0 # Skip: writing past 2GB failed: process limits?\n";
     } elsif ($! =~ /quota/i) {
-       print "1..0\n# filesystem quota limits?\n";
+       print "1..0 # Skip: filesystem quota limits?\n";
     }
     explain();
     bye();
@@ -120,6 +150,12 @@ unless ($print && $close) {
 
 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++;
@@ -192,4 +228,8 @@ explain if $fail;
 
 bye(); # does the necessary cleanup
 
+END {
+   unlink "big"; # be paranoid about leaving 5 gig files lying around
+}
+
 # eof