perf tools: Add on_exit implementation

on_exit() is only available in new versions of glibc.
It is not implemented in Bionic and will lead to linking errors when
compiling for Android.

Implement a wrapper for on_exit using atexit.

The implementation for on_exit is the one sent by Bernhard Rosenkraenzer in
https://lkml.org/lkml/2012/8/23/316. The configuration part from the Makefile
is different than the one from the original patch.

Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Irina Tirdea <irina.tirdea@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1349678613-7045-2-git-send-email-irina.tirdea@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 48 insertions, 1 deletions

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index d80a33324785..a7d8745e0ab2 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -753,6 +753,12 @@ ifndef NO_STRLCPY
         endif
 endif
 
+ifndef NO_ON_EXIT
+        ifeq ($(call try-cc,$(SOURCE_ON_EXIT),),y)
+                BASIC_CFLAGS += -DHAVE_ON_EXIT
+        endif
+endif
+
 ifndef NO_BACKTRACE
        ifeq ($(call try-cc,$(SOURCE_BACKTRACE),),y)
                BASIC_CFLAGS += -DBACKTRACE_SUPPORT
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index e9231659754d..73b5d7f91194 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -31,6 +31,38 @@
 #include <sched.h>
 #include <sys/mman.h>
 
+#ifndef HAVE_ON_EXIT
+#ifndef ATEXIT_MAX
+#define ATEXIT_MAX 32
+#endif
+static int __on_exit_count = 0;
+typedef void (*on_exit_func_t) (int, void *);
+static on_exit_func_t __on_exit_funcs[ATEXIT_MAX];
+static void *__on_exit_args[ATEXIT_MAX];
+static int __exitcode = 0;
+static void __handle_on_exit_funcs(void);
+static int on_exit(on_exit_func_t function, void *arg);
+#define exit(x) (exit)(__exitcode = (x))
+
+static int on_exit(on_exit_func_t function, void *arg)
+{
+        if (__on_exit_count == ATEXIT_MAX)
+                return -ENOMEM;
+        else if (__on_exit_count == 0)
+                atexit(__handle_on_exit_funcs);
+        __on_exit_funcs[__on_exit_count] = function;
+        __on_exit_args[__on_exit_count++] = arg;
+        return 0;
+}
+
+static void __handle_on_exit_funcs(void)
+{
+        int i;
+        for (i = 0; i < __on_exit_count; i++)
+                __on_exit_funcs[i] (__exitcode, __on_exit_args[i]);
+}
+#endif
+
 enum write_mode_t {
         WRITE_FORCE,
         WRITE_APPEND
diff --git a/tools/perf/config/feature-tests.mak b/tools/perf/config/feature-tests.mak
index 4add41bb0c7e..eaeb0fd6f395 100644
--- a/tools/perf/config/feature-tests.mak
+++ b/tools/perf/config/feature-tests.mak
@@ -203,4 +203,13 @@ int main(void)
         return audit_open();
 }
 endef
-endif
\ No newline at end of file
+endif
+
+define SOURCE_ON_EXIT
+#include <stdio.h>
+
+int main(void)
+{
+        return on_exit(NULL, NULL);
+}
+endef