exactness: protect against forked calls

there came up a issue, where a excatness spawned processes were bringing
up a efreetd instance, when the efreetd instance turned off itself, the
files for exactness were written again, which is wrong. This ensures
that forked instances do not take any actions.

Differential Revision: https://phab.enlightenment.org/D11634

src/bin/exactness/common.c

@@ -4,6 +4,31 @@
 
 #include "common.h"
 
+Eina_Bool
+ex_is_original_app(void)
+{
+   const char *original_pid_env = getenv("EXACTNESS_ORIGINAL_PID");
+   if (original_pid_env)
+     {
+        pid_t original_pid = atoi(original_pid_env);
+        if (original_pid == getpid())
+          return EINA_TRUE;
+     }
+   return EINA_FALSE;
+}
+
+void
+ex_set_original_envvar(void)
+{
+   const char *original_pid_env = getenv("EXACTNESS_ORIGINAL_PID");
+   if (!original_pid_env)
+     {
+        char pid[30];
+        snprintf(pid, sizeof(pid), "%d", getpid());
+        setenv("EXACTNESS_ORIGINAL_PID", pid, 0);
+     }
+}
+
 void
 ex_prepare_elm_overloay(void)
 {

src/bin/exactness/common.h

@@ -260,6 +260,9 @@ typedef struct
 Evas *(*_evas_new)(void);
 const char *_exactness_action_type_to_string_get(Exactness_Action_Type type);
 
+
+Eina_Bool ex_is_original_app(void);
+void ex_set_original_envvar(void);
 Eina_Bool exactness_image_compare(Exactness_Image *img1, Exactness_Image *img2, Exactness_Image **diff_img);
 Exactness_Unit *exactness_unit_file_read(const char *filename);
 Eina_Bool exactness_unit_file_write(Exactness_Unit *unit, const char *filename);

src/bin/exactness/player.c

@@ -1039,6 +1039,8 @@ eina_init(void)
 
    ORIGINAL_CALL("eina_init");
 
+   ex_set_original_envvar();
+
    if (original_return == 1)
      {
         const char *dest = getenv("EXACTNESS_DEST");
@@ -1080,7 +1082,7 @@ ecore_evas_init(void)
 
    ORIGINAL_CALL("ecore_evas_init")
 
-   if (original_return == 1)
+   if (ex_is_original_app() && original_return == 1)
      {
         _setup_ee_creation();
      }
@@ -1095,7 +1097,7 @@ elm_init(int argc, char **argv)
    int original_return;
    ORIGINAL_CALL("elm_init", argc, argv)
 
-   if (original_return == 1)
+   if (ex_is_original_app() && original_return == 1)
      ex_prepare_elm_overloay();
 
    return original_return;
@@ -1106,7 +1108,8 @@ ecore_main_loop_begin(void)
 {
    int original_return;
    ORIGINAL_CALL("ecore_main_loop_begin")
-   _write_unit_file();
+   if (ex_is_original_app())
+     _write_unit_file();
    (void)original_return;
 }
 
@@ -1115,7 +1118,8 @@ efl_loop_begin(Eo *obj)
 {
    Eina_Value *original_return;
    ORIGINAL_CALL_T(Eina_Value*, "efl_loop_begin", obj);
-   _write_unit_file();
+   if (ex_is_original_app())
+     _write_unit_file();
    return original_return;
 }
 
@@ -1125,7 +1129,7 @@ eina_shutdown(void)
    int original_return;
    static Eina_Bool output_written = EINA_FALSE;
    ORIGINAL_CALL("eina_shutdown")
-   if (original_return == 1 && !output_written)
+   if (ex_is_original_app() &&original_return == 1 && !output_written)
      {
         output_written = EINA_TRUE;
         _write_unit_file();

src/bin/exactness/recorder.c

@@ -314,7 +314,9 @@ eina_init(void)
 
    ORIGINAL_CALL("eina_init");
 
-   if (original_return == 1)
+   ex_set_original_envvar();
+
+   if (ex_is_original_app() && original_return == 1)
      {
         _log_domain = eina_log_domain_register("exactness_recorder", NULL);
 
@@ -336,7 +338,7 @@ ecore_evas_init(void)
 
    ORIGINAL_CALL("ecore_evas_init")
 
-   if (original_return == 1)
+   if (ex_is_original_app() && original_return == 1)
      {
         _setup_ee_creation();
 
@@ -352,7 +354,7 @@ elm_init(int argc, char **argv)
    int original_return;
    ORIGINAL_CALL("elm_init", argc, argv)
 
-   if (original_return == 1)
+   if (ex_is_original_app() && original_return == 1)
      ex_prepare_elm_overloay();
 
    return original_return;
@@ -363,7 +365,8 @@ ecore_main_loop_begin(void)
 {
    int original_return;
    ORIGINAL_CALL("ecore_main_loop_begin")
-   _output_write();
+   if (ex_is_original_app())
+     _output_write();
    (void)original_return;
 }
 
@@ -372,7 +375,8 @@ efl_loop_begin(Eo *obj)
 {
    Eina_Value *original_return;
    ORIGINAL_CALL_T(Eina_Value*, "efl_loop_begin", obj);
-        _output_write();
+   if (ex_is_original_app())
+     _output_write();
    return original_return;
 }
 
@@ -382,7 +386,7 @@ eina_shutdown(void)
    int original_return;
    static Eina_Bool output_written = EINA_FALSE;
    ORIGINAL_CALL("eina_shutdown")
-   if (original_return == 1 && !output_written)
+   if (ex_is_original_app() && original_return == 1 && !output_written)
      {
         output_written = EINA_TRUE;
         _output_write();