Run through Clang's android-cloexec checkers

This is mainly useful with SELinux.

src/backend.c

@@ -371,8 +371,8 @@ static bool opencl_test_instruction (hashcat_ctx_t *hashcat_ctx, cl_context cont
   #ifndef DEBUG
   #ifndef _WIN
   fflush (stderr);
-  int bak = dup (2);
-  int tmp = open ("/dev/null", O_WRONLY);
+  int bak = fcntl(2, F_DUPFD_CLOEXEC);
+  int tmp = open ("/dev/null", O_WRONLY | O_CLOEXEC);
   dup2 (tmp, 2);
   close (tmp);
   #endif
@@ -383,7 +383,11 @@ static bool opencl_test_instruction (hashcat_ctx_t *hashcat_ctx, cl_context cont
   #ifndef DEBUG
   #ifndef _WIN
   fflush (stderr);
+  #ifndef __APPLE__
+  dup3 (bak, 2, O_CLOEXEC);
+  #else
   dup2 (bak, 2);
+  #endif
   close (bak);
   #endif
   #endif

src/shared.c

@@ -336,7 +336,11 @@ bool hc_path_create (const char *path)
 {
   if (hc_path_exist (path) == true) return false;
 
-  const int fd = creat (path, S_IRUSR | S_IWUSR);
+#ifdef O_CLOEXEC
+  const int fd = open (path, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, S_IRUSR | S_IWUSR);
+#else
+  const int fd = open (path, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
+#endif
 
   if (fd == -1) return false;