[SCM] master: Detect/log bad /proc/PID/task/TID entries.

[cagney@sourceware.org]

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- Log -----------------------------------------------------------------
commit bac57ca6670cb2cfc1e02de0351288cf38e8a649
Author: Andrew Cagney <cagney@redhat.com>
Date:   Tue Mar 11 20:25:34 2008 -0400

    Detect/log bad /proc/PID/task/TID entries.
    
    frysk-sys/frysk/sys/proc/ChangeLog
    2008-03-11  Andrew Cagney  <cagney@redhat.com>
    
    	* cni/ProcBuilder.cxx (ProcBuilder::scan): Add warnings when PID
    	is bogus.
    	* ProcBuilder.java (warning): Add.

-----------------------------------------------------------------------

Summary of changes:
 frysk-sys/frysk/sys/proc/ChangeLog           |    6 ++++++
 frysk-sys/frysk/sys/proc/ProcBuilder.java    |    8 ++++++--
 frysk-sys/frysk/sys/proc/cni/ProcBuilder.cxx |   23 ++++++++++++++++++++---
 3 files changed, 32 insertions(+), 5 deletions(-)

First 500 lines of diff:
diff --git a/frysk-sys/frysk/sys/proc/ChangeLog b/frysk-sys/frysk/sys/proc/ChangeLog
index 6713af1..39f22c8 100644
--- a/frysk-sys/frysk/sys/proc/ChangeLog
+++ b/frysk-sys/frysk/sys/proc/ChangeLog
@@ -1,3 +1,9 @@
+2008-03-11  Andrew Cagney  <cagney@redhat.com>
+
+	* cni/ProcBuilder.cxx (ProcBuilder::scan): Add warnings when PID
+	is bogus.
+	* ProcBuilder.java (warning): Add.
+
 2008-02-14  Andrew Cagney  <cagney@redhat.com>
 
 	* Stat.java (toString()): New.
diff --git a/frysk-sys/frysk/sys/proc/ProcBuilder.java b/frysk-sys/frysk/sys/proc/ProcBuilder.java
index 6e34267..9f107ce 100644
--- a/frysk-sys/frysk/sys/proc/ProcBuilder.java
+++ b/frysk-sys/frysk/sys/proc/ProcBuilder.java
@@ -41,6 +41,8 @@ package frysk.sys.proc;
 
 import gnu.gcj.RawData;
 import frysk.sys.ProcessIdentifier;
+import frysk.rsl.Log;
+import frysk.rsl.LogFactory;
 
 /**
  * Scan the <tt>/proc</tt>, or <tt>/proc/</tt>pid<tt>/task</tt>
@@ -48,6 +50,8 @@ import frysk.sys.ProcessIdentifier;
  * encountered.
  */
 public abstract class ProcBuilder {
+    private static final Log warning = LogFactory.warning(ProcBuilder.class);
+
     /**
      * Iterate over the <tt>/proc</tt>pid<tt>/task</tt> directory
      * notifying ProcBuilder of each "interesting" entry.  Use
@@ -61,7 +65,7 @@ public abstract class ProcBuilder {
 	if (dir == null)
 	    return false;
 	try {
-	    scan (dir);
+	    scan(dir, pid, warning);
 	}
 	finally {
 	    close (dir);
@@ -85,6 +89,6 @@ public abstract class ProcBuilder {
      * directory.  Move to frysk.sys.Dir?
      */
     private native RawData open(int pid);
-    private native void scan(RawData dir);
+    private native void scan(RawData dir, int pid, Log warning);
     private native void close(RawData dir);
 }
diff --git a/frysk-sys/frysk/sys/proc/cni/ProcBuilder.cxx b/frysk-sys/frysk/sys/proc/cni/ProcBuilder.cxx
index a58c495..8aa0fa9 100644
--- a/frysk-sys/frysk/sys/proc/cni/ProcBuilder.cxx
+++ b/frysk-sys/frysk/sys/proc/cni/ProcBuilder.cxx
@@ -49,6 +49,8 @@
 #include "frysk/sys/proc/ProcBuilder.h"
 #include "frysk/sys/ProcessIdentifier.h"
 #include "frysk/sys/ProcessIdentifierFactory.h"
+#include "frysk/rsl/Log.h"
+#include "frysk/rsl/cni/Log.hxx"
 
 gnu::gcj::RawData*
 frysk::sys::proc::ProcBuilder::open (jint pid)
@@ -68,9 +70,11 @@ frysk::sys::proc::ProcBuilder::open (jint pid)
 }
 
 void
-frysk::sys::proc::ProcBuilder::scan (gnu::gcj::RawData* rawData)
+frysk::sys::proc::ProcBuilder::scan(gnu::gcj::RawData* rawData, jint pid,
+				    frysk::rsl::Log* warning)
 {
   DIR* proc = (DIR*) rawData;
+  int bad = 1; // something non-ve or 0.
 
   while (true) {
 
@@ -79,14 +83,27 @@ frysk::sys::proc::ProcBuilder::scan (gnu::gcj::RawData* rawData)
     if (dirent == NULL)
       break;
 
-    // Get the pid, skip if non-numeric.
+    // Scan the pid, skip if non-numeric.
     char* end = NULL;
     int id = strtol (dirent->d_name, &end, 10);
     if (end == dirent->d_name)
       continue;
 
-    build(frysk::sys::ProcessIdentifierFactory::create(id));
+    // Seems some kernels return a dirent containing bad (e.g., 0) or
+    // even random entries; report them and then throw an error.
+    if (bad <= 0) {
+      logf(warning, "/proc/%d/task contained bad pid: %d; skipping %d",
+	   (int)pid, bad, id);
+    } else if (id <= 0) {
+      bad = id;
+      logf(warning, "/proc/%d/task contains bad pid: %d", (int)pid, id);
+    } else {
+      build(frysk::sys::ProcessIdentifierFactory::create(id));
+    }
   }
+
+  if (bad <= 0)
+    throwRuntimeException("/proc/$$/task contains bad pid", "pid", bad);
 }
 
 void


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