[Assorted-commits] SF.net SVN: assorted:[1343] sandbox/trunk/src/nix/preload

[<yan...@us...>]

Revision: 1343
          http://assorted.svn.sourceforge.net/assorted/?rev=1343&view=rev
Author:   yangzhang
Date:     2009-04-27 21:23:05 +0000 (Mon, 27 Apr 2009)

Log Message:
-----------
added demo that posix_memalign doesn't call malloc

Modified Paths:
--------------
    sandbox/trunk/src/nix/preload/interposer.c
    sandbox/trunk/src/nix/preload/run.bash

Added Paths:
-----------
    sandbox/trunk/src/nix/preload/memalign.c

Modified: sandbox/trunk/src/nix/preload/interposer.c
===================================================================
--- sandbox/trunk/src/nix/preload/interposer.c	2009-04-27 21:16:07 UTC (rev 1342)
+++ sandbox/trunk/src/nix/preload/interposer.c	2009-04-27 21:23:05 UTC (rev 1343)
@@ -1,30 +1,45 @@
 #define _GNU_SOURCE
 #include <stdio.h>
+#include <stdlib.h>
 #include <dlfcn.h>
 
+#ifdef COUNT
+int mallocs = 0;
+void dump() { printf("%d mallocs\n", mallocs); }
+#endif
+
 void *
 malloc(size_t sz)
 {
   // Find and cache the next malloc (in our example it should be the "real"
   // malloc).
   static void * (*func)();
-  if (!func)
+  if (!func) {
     func = (void *(*)()) dlsym(RTLD_NEXT, "malloc");
+#ifdef COUNT
+    atexit(dump);
+#endif
+  }
 
-  // Do our thang.
 #ifdef VERBOSE
-  printf("malloc(%u) is called\n", sz);
+  printf("malloc(%zu) is called\n", sz);
 #endif
 
   // Call real malloc.
   void *p = func(sz);
 
-  // Do our thang.
+#ifdef COUNT
+  ++mallocs;
+#endif
+
 #ifdef VERBOSE
   printf("malloc returned %p\n", p);
 #endif
+
+#ifdef FAILURES
   if (!p)
     printf("malloc failed!\n");
+#endif
 
   return p;
 }

Added: sandbox/trunk/src/nix/preload/memalign.c
===================================================================
--- sandbox/trunk/src/nix/preload/memalign.c	                        (rev 0)
+++ sandbox/trunk/src/nix/preload/memalign.c	2009-04-27 21:23:05 UTC (rev 1343)
@@ -0,0 +1,9 @@
+// malloc doesn't get called at all!
+
+#include <stdlib.h>
+
+int main() {
+  void *p;
+  posix_memalign(&p, 131072, 131072);
+  return 0;
+}

Modified: sandbox/trunk/src/nix/preload/run.bash
===================================================================
--- sandbox/trunk/src/nix/preload/run.bash	2009-04-27 21:16:07 UTC (rev 1342)
+++ sandbox/trunk/src/nix/preload/run.bash	2009-04-27 21:23:05 UTC (rev 1343)
@@ -4,6 +4,9 @@
 
 gcc -Wall -o testc  test.c
 g++ -Wall -o testcc test.cc
-gcc -Wall -shared -fPIC -ldl -o interposer.so interposer.c
-LD_PRELOAD=./interposer.so ./testc
-LD_PRELOAD=./interposer.so ./testcc || true
+g++ -Wall -o memalign memalign.c
+gcc -Wall -DCOUNT -shared -fPIC -ldl -o interposer_c.so interposer.c
+gcc -Wall -DVERBOSE -shared -fPIC -ldl -o interposer_v.so interposer.c
+LD_PRELOAD=./interposer_v.so ./memalign
+LD_PRELOAD=./interposer_c.so ./testc
+LD_PRELOAD=./interposer_c.so ./testcc || true


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