From: Nicholas Clark <nick@ccl4.org>
Date: Sat, 1 Apr 2006 15:11:11 +0000 (+0000)
Subject: Rewrite t/op/getppid.t to remove the assumption that init has PID of 1.
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=a428795db34ad0ab0091b073e8062b7e0f58355e;p=p5sagit%2Fp5-mst-13.2.git

Rewrite t/op/getppid.t to remove the assumption that init has PID of 1.

p4raw-id: //depot/perl@27660
---

diff --git a/t/op/getppid.t b/t/op/getppid.t
index cb48688..cb069ff 100644
--- a/t/op/getppid.t
+++ b/t/op/getppid.t
@@ -1,7 +1,11 @@
 #!./perl
 
 # Test that getppid() follows UNIX semantics: when the parent process
-# dies, the child is reparented to the init process (pid 1).
+# dies, the child is reparented to the init process
+# The init process is usually 1, but doesn't have to be, and there's no
+# standard way to find out what it is, so the only portable way to go it so
+# attempt 2 reparentings and see if the PID both orphaned grandchildren get is
+# the same. (and not ours)
 
 BEGIN {
     chdir 't' if -d 't';
@@ -18,37 +22,50 @@ BEGIN {
 	    exit;
 	}
     }
-    print "1..3\n";
+    require './test.pl';
+    plan (7);
 }
 
-pipe my ($r, $w) or die "pipe: $!\n";
-my $pid = fork; defined $pid or die "fork: $!\n";
+sub fork_and_retrieve {
+    my $which = shift;
+    pipe my ($r, $w) or die "pipe: $!\n";
+    my $pid = fork; defined $pid or die "fork: $!\n";
 
-if ($pid) {
-    # parent
-    close $w;
-    waitpid($pid, 0) == $pid or die "waitpid: $!\n";
-    print <$r>;
-}
-else {
-    # child
-    close $r;
-    my $pid2 = fork; defined $pid2 or die "fork: $!\n";
-    if ($pid2) {
+    if ($pid) {
+	# parent
 	close $w;
-	sleep 1;
+	$_ = <$r>;
+	chomp;
+	die "Garbled output '$_'"
+	    unless my ($first, $second) = /^(\d+),(\d+)\z/;
+	cmp_ok ($first, '>=', 1, "Parent of $which grandchild");
+	cmp_ok ($second, '>=', 1, "New parent of orphaned $which grandchild");
+	isnt($first, $second, "Orphaned $which grandchild got a new parent");
+	return $second;
     }
     else {
-	# grandchild
-	my $ppid1 = getppid();
-	print $w "not " if $ppid1 <= 1;
-	print $w "ok 1 # ppid1=$ppid1\n";
-	sleep 2;
-	my $ppid2 = getppid();
-	print $w "not " if $ppid1 == $ppid2;
-	print $w "ok 2 # ppid2=$ppid2, ppid1!=ppid2\n";
-	print $w "not " if $ppid2 != 1;
-	print $w "ok 3 # ppid2=1\n";
+	# child
+	# Prevent test.pl from thinking that we failed to run any tests.
+	$::NO_ENDING = 1;
+	close $r;
+
+	my $pid2 = fork; defined $pid2 or die "fork: $!\n";
+	if ($pid2) {
+	    close $w;
+	    sleep 1;
+	}
+	else {
+	    # grandchild
+	    my $ppid1 = getppid();
+	    # Wait for immediate parent to exit
+	    sleep 2;
+	    my $ppid2 = getppid();
+	    print $w "$ppid1,$ppid2\n";
+	}
+	exit 0;
     }
-    exit 0;
 }
+
+my $first = fork_and_retrieve("first");
+my $second = fork_and_retrieve("second");
+is ($first, $second, "Both orphaned grandchildren get the same new parent");