popen_wdt: Use different type for win/posix exitcode

- And change POPEN_WDT_EXIT_INITIALIZER with POPEN_WDT_EXIT_CODE_MAX

src/command_modules/support/popen_wdt/popen_wdt.c

@@ -1,12 +1,11 @@
 #include "popen_wdt.h"
 #include <stdlib.h>
-#include <string.h>
 
 bool popen_watchdog_init(popen_watchdog_data_t **data) {
     if (data != NULL) {
         *data = calloc(1, sizeof(popen_watchdog_data_t));
         if (*data != NULL) {
-            (*data)->sleep_secs = 10;
+            (*data)->sleep_secs = POPEN_WDT_DEFAULT_SLEEP_SECS;
             return true;
         }
     }

src/command_modules/support/popen_wdt/popen_wdt.h

@@ -1,11 +1,26 @@
 #pragma once
 
 #include <stdbool.h>
+#include <stdint.h>
+#include <limits.h>
+#ifdef _WIN32
+#include <windows.h>
+#endif
 
 #ifndef NDEBUG
 #define POPEN_WDT_DEBUG
 #endif
 
+#ifdef _WIN32
+typedef DWORD popen_watchdog_exit_code_t;
+#define POPEN_WDT_EXIT_CODE_MAX ULONG_MAX
+#else
+typedef uint8_t popen_watchdog_exit_code_t;
+#define POPEN_WDT_EXIT_CODE_MAX UINT8_MAX
+#endif
+
+#define POPEN_WDT_DEFAULT_SLEEP_SECS 10
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -14,12 +29,11 @@ extern "C" {
 #define POPEN_WDT_SIGTERM 2
 
 typedef struct {
-    int exitcode; /* exit code of the process, default -255 */
-    bool signal;  /* if the process was signaled, then the exit code becomes the
-                     signum */
+    popen_watchdog_exit_code_t exitcode; /* exit code of the process, default POPEN_WDT_EXIT_CODE_MAX */
+    bool signal;  /* if the process was signaled, if yes, exitcode is signal num */
 } popen_watchdog_exit_t;
 
-#define POPEN_WDT_EXIT_INITIALIZER { -1, false }
+#define POPEN_WDT_EXIT_INITIALIZER { POPEN_WDT_EXIT_CODE_MAX, false }
 
 typedef struct {
     const char *command;     /* command string */