[SCM] master: ftrace: tracing inside dynamic linker has to be allowed with -i option

[pmachata at sourceware dot org]

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- Log -----------------------------------------------------------------
commit 1cc9d6f4bc5db27bf30ff59207d5588bf090495c
Author: Petr Machata <pmachata@redhat.com>
Date:   Wed Dec 12 22:58:35 2007 +0100

    ftrace: tracing inside dynamic linker has to be allowed with -i option
    
    * ftrace now implicitly generates -@INTERP rule at the end of each script.
      When the user wishes to trace dynamic linker, she should use -i.

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

Summary of changes:
 frysk-core/frysk/bindir/ChangeLog   |    5 +++++
 frysk-core/frysk/bindir/ftrace.java |   19 +++++++++++++++++++
 frysk-core/frysk/bindir/ftrace.xml  |   11 +++++++++++
 3 files changed, 35 insertions(+), 0 deletions(-)

First 500 lines of diff:
diff --git a/frysk-core/frysk/bindir/ChangeLog b/frysk-core/frysk/bindir/ChangeLog
index 835f14a..eb12a1d 100644
--- a/frysk-core/frysk/bindir/ChangeLog
+++ b/frysk-core/frysk/bindir/ChangeLog
@@ -1,5 +1,10 @@
 2007-12-12  Petr Machata  <pmachata@redhat.com>
 
+	* ftrace.java: Support -i for tracing inside dynamic linker.
+	* ftrace.xml: Describe it.
+
+2007-12-12  Petr Machata  <pmachata@redhat.com>
+
 	* ftrace.java: Use aliasing capabilities of Symbol.
 	(checkNameMatches): New method.
 
diff --git a/frysk-core/frysk/bindir/ftrace.java b/frysk-core/frysk/bindir/ftrace.java
index a0c416b..55e8524 100644
--- a/frysk-core/frysk/bindir/ftrace.java
+++ b/frysk-core/frysk/bindir/ftrace.java
@@ -308,6 +308,7 @@ class ftrace
     final List dynRules = new ArrayList();
     final List symRules = new ArrayList();
     final MyLtraceController controller = new MyLtraceController();
+    boolean allowInterpTracing = false;
 
     Ftrace tracer = new Ftrace();
 
@@ -453,6 +454,13 @@ class ftrace
           }
         });
 
+        parser.add(new Option('i', "don't trace dynamic linker symbols") {
+          public void parsed(String arg) throws OptionException
+          {
+	      allowInterpTracing = true;
+          }
+        });
+
 	parser.add(new Option("plt", "trace library calls done via PLT", "RULE[,RULE]...") {
 		public void parsed(String arg) {
 		    pltRules.add(arg);
@@ -504,6 +512,17 @@ class ftrace
         if (writer == null)
             writer = new PrintWriter(System.out);
 
+	// If tracing dynamic linker disabled, generate implicit
+	// -@INTERP rule at the end of the chain.
+	if (!allowInterpTracing) {
+	    if (pltRules.size() > 0)
+		pltRules.add("-@INTERP");
+	    if (dynRules.size() > 0)
+		dynRules.add("-@INTERP");
+	    if (symRules.size() > 0)
+		symRules.add("-@INTERP");
+	}
+
 	// We need to load and apply rules separately, to get all log
 	// messages.
 	for (Iterator it = pltRules.iterator(); it.hasNext(); )
diff --git a/frysk-core/frysk/bindir/ftrace.xml b/frysk-core/frysk/bindir/ftrace.xml
index 71279d7..30bb6b8 100644
--- a/frysk-core/frysk/bindir/ftrace.xml
+++ b/frysk-core/frysk/bindir/ftrace.xml
@@ -69,6 +69,7 @@
     <cmdsynopsis>
       <command>ftrace</command>
       <arg choice="opt">-c</arg>
+      <arg choice="opt">-i</arg>
       <arg choice="opt">-m</arg>
       <arg choice="opt">-o=<replaceable>FILE</replaceable></arg>
       <arg choice="opt" rep="repeat">-p=<replaceable>PID</replaceable></arg>
@@ -158,6 +159,16 @@
 
 	<variablelist>
 	  <varlistentry>
+	    <term>-i</term>
+	    <listitem>
+	      <para>Trace inside dynamic linker.  When this option is
+	      not present, <function>ftrace</function> will function
+	      as if -@INTERP rule was present at the end of each
+	      tracing script.</para>
+	    </listitem>
+	  </varlistentry>
+
+	  <varlistentry>
 	    <term>-plt=<replaceable>RULE</replaceable>[,<replaceable>RULE</replaceable>...]</term>
 	    <listitem>
 	      <para>Trace library calls done via PLT entries matching each


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