when run under memcheck allow SIGUSR2 to dump current memory allocations

desktop/scripts/soffice.sh

@@ -109,6 +109,7 @@ for arg in $@ $VALGRINDOPT ; do
                 fi
                 # finally set the valgrind check
                 VALGRINDCHECK="valgrind --tool=$VALGRIND --trace-children=yes $valgrind_skip --num-callers=50 --error-limit=no --error-exitcode=101"
+                echo "use kill -SIGUSR2 pid to dump traces of active allocations"
                 checks="c$checks"
                 if [ "$VALGRIND" = "memcheck" ] ; then
                     export G_SLICE=always-malloc

sal/osl/unx/signal.c

@@ -87,6 +87,10 @@
 
 #define MAX_PATH_LEN    2048
 
+#if defined(HAVE_MEMCHECK_H)
+#include <memcheck.h>
+#endif
+
 typedef struct _oslSignalHandlerImpl
 {
     oslSignalHandlerFunction      Handler;
@@ -260,8 +264,13 @@ static sal_Bool InitSignal()
     sigfillset(&(act.sa_mask));
 
     /* Initialize the rest of the signals */
-    for (i = 0; i < NoSignals; i++)
+    for (i = 0; i < NoSignals; ++i)
     {
+#if defined(HAVE_MEMCHECK_H)
+        if (Signals[i].Signal == SIGUSR2 && RUNNING_ON_VALGRIND)
+            Signals[i].Action = ACT_IGNORE;
+#endif
+
         /* hack: stomcatd is attaching JavaVM wich dont work with an sigaction(SEGV) */
         if ((bSetSEGVHandler || Signals[i].Signal != SIGSEGV)
         && (bSetWINCHHandler || Signals[i].Signal != SIGWINCH)
@@ -283,6 +292,7 @@ static sal_Bool InitSignal()
                         Signals[i].Handler = SIG_DFL;
                 }
                 else
+                {
                     if (sigaction(Signals[i].Signal, &act, &oact) == 0)
                         Signals[i].Handler = oact.sa_handler;
                     else
@@ -290,6 +300,7 @@ static sal_Bool InitSignal()
                 }
             }
         }
+    }
 
     /* Clear signal mask inherited from parent process (on Mac OS X, upon a
        crash soffice re-execs itself from within the signal handler, so the
@@ -908,6 +919,26 @@ void CallSystemHandler(int Signal)
     }
 }
 
+#if defined(HAVE_MEMCHECK_H)
+static void DUMPCURRENTALLOCS()
+{
+    fprintf(stderr, "hello world\n");
+    VALGRIND_PRINTF( "=== start memcheck dump of active allocations ===\n" );
+
+#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
+#   pragma GCC diagnostic push
+#   pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#endif
+
+    VALGRIND_DO_LEAK_CHECK;
+
+#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
+#   pragma GCC diagnostic pop
+#endif
+
+    VALGRIND_PRINTF( "=== end memcheck dump of active allocations ===\n" );
+}
+#endif
 
 /*****************************************************************************/
 /* SignalHandlerFunction    */
@@ -947,6 +978,14 @@ void SignalHandlerFunction(int Signal)
             Info.Signal = osl_Signal_Terminate;
             break;
 
+#if defined(HAVE_MEMCHECK_H)
+        case SIGUSR2:
+            if (RUNNING_ON_VALGRIND)
+                DUMPCURRENTALLOCS();
+            Info.Signal = osl_Signal_System;
+            break;
+#endif
+
         default:
             Info.Signal = osl_Signal_System;
             break;