PERFORCE change 96024 for review

[John Birrell]

http://perforce.freebsd.org/chv.cgi?CH=96024

Change 96024 by jb at jb_freebsd2 on 2006/04/24 23:24:52

	Add a function to iterate over each linker file and call a
	callback function.
	
	DTrace needs to do this. It's important that the linker file
	list remains locked while the callback function is in progress.
	
	Ideally the linker file lock would allow the callback function
	to allocate memory with wait.

Affected files ...

.. //depot/projects/dtrace/src/sys/kern/kern_linker.c#3 edit
.. //depot/projects/dtrace/src/sys/sys/linker.h#3 edit

Differences ...

==== //depot/projects/dtrace/src/sys/kern/kern_linker.c#3 (text+ko) ====

@@ -608,6 +608,27 @@
 	return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp));
 }
 
+/*
+ * List linker files.
+ */
+int
+linker_file_list(int (*callback_func)(linker_file_t,void *),void *arg)
+{
+	linker_file_t lf;
+	int error = 0;
+
+	mtx_lock(&kld_mtx);
+
+	TAILQ_FOREACH(lf, &linker_files, link) {
+		if ((error = callback_func(lf, arg)) != 0)
+			break;
+	}
+
+	mtx_unlock(&kld_mtx);
+
+	return (error);
+}
+
 caddr_t
 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps)
 {

==== //depot/projects/dtrace/src/sys/sys/linker.h#3 (text+ko) ====

@@ -159,6 +159,11 @@
 			   void *_start, void *_stop, int *_count);
 
 /*
+ * List linker files.
+ */
+int linker_file_list(int (*)(linker_file_t,void *),void *);
+
+/*
  * This routine is responsible for finding dependencies of userland
  * initiated kldload(2)'s of files.
  */