From c5dad16612beccdc99a8b79334cd6e563052b631 Mon Sep 17 00:00:00 2001
From: FlightlessMango <flightlessmangoyt@gmail.com>
Date: Mon, 16 Mar 2020 16:48:12 +0100
Subject: [PATCH] Listen for modify on config file

---
 src/config.cpp    |  3 +++
 src/config.h      |  2 ++
 src/gl/inject.cpp |  2 ++
 src/meson.build   |  1 +
 src/notify.cpp    | 28 ++++++++++++++++++++++++++++
 src/notify.h      |  5 +++++
 src/overlay.cpp   |  2 ++
 7 files changed, 43 insertions(+)
 create mode 100644 src/notify.cpp
 create mode 100644 src/notify.h

diff --git a/src/config.cpp b/src/config.cpp
index 9c286c0..22b016b 100644
--- a/src/config.cpp
+++ b/src/config.cpp
@@ -2,11 +2,13 @@
 #include <sstream>
 #include <iostream>
 #include <string.h>
+#include <thread>
 #include "config.h"
 #include "overlay_params.h"
 #include "file_utils.h"
 #include "string_utils.h"
 
+std::string config_file_path;
 std::unordered_map<std::string,std::string> options;
 
 void parseConfigLine(std::string line) {
@@ -91,6 +93,7 @@ void parseConfigFile() {
             parseConfigLine(line);
         }
         std::cerr << " [ ok ]" << std::endl;
+        config_file_path = *p;
         return;
     }
 }
diff --git a/src/config.h b/src/config.h
index 4fa3f45..35d45b7 100644
--- a/src/config.h
+++ b/src/config.h
@@ -1,5 +1,7 @@
 #include <unordered_map>
+#include <string>
 
 extern std::unordered_map<std::string,std::string> options;
+extern std::string config_file_path;
 
 void parseConfigFile(void);
\ No newline at end of file
diff --git a/src/gl/inject.cpp b/src/gl/inject.cpp
index 88d0f17..0514393 100644
--- a/src/gl/inject.cpp
+++ b/src/gl/inject.cpp
@@ -17,6 +17,7 @@
 #include "mesa/util/macros.h"
 #include "mesa/util/os_time.h"
 #include "file_utils.h"
+#include "notify.h"
 
 #include <chrono>
 #include <iomanip>
@@ -48,6 +49,7 @@ void imgui_init()
     if (cfg_inited)
         return;
     parse_overlay_config(&params, getenv("MANGOHUD_CONFIG"));
+    pthread_create(&fileChange, NULL, &fileChanged, &params);
     window_size = ImVec2(params.width, params.height);
     init_system_info();
     cfg_inited = true;
diff --git a/src/meson.build b/src/meson.build
index b2bfb61..cb91803 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -50,6 +50,7 @@ vklayer_files = files(
   'config.cpp',
   'iostats.cpp',
   'gpu.cpp',
+  'notify.cpp',
 )
 
 opengl_files = files(
diff --git a/src/notify.cpp b/src/notify.cpp
new file mode 100644
index 0000000..233bc6a
--- /dev/null
+++ b/src/notify.cpp
@@ -0,0 +1,28 @@
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/inotify.h>
+#include "config.h"
+#include "notify.h"
+
+pthread_t fileChange;
+
+#define EVENT_SIZE  ( sizeof (struct inotify_event) )
+#define EVENT_BUF_LEN     ( 1024 * ( EVENT_SIZE + 16 ) )
+
+void *fileChanged(void *params_void){
+    overlay_params *params = reinterpret_cast<overlay_params *>(params_void);
+    int length, i = 0;
+    int fd;
+    int wd;
+    char buffer[EVENT_BUF_LEN];
+    fd = inotify_init();
+    wd = inotify_add_watch( fd, config_file_path.c_str(), IN_MODIFY);
+    length = read( fd, buffer, EVENT_BUF_LEN );
+    while (i < length) {
+        struct inotify_event *event =
+            (struct inotify_event *) &buffer[i];
+        i += EVENT_SIZE + event->len;
+    }
+    printf("File Changed\n");
+    return NULL;
+}
\ No newline at end of file
diff --git a/src/notify.h b/src/notify.h
new file mode 100644
index 0000000..7fff8a8
--- /dev/null
+++ b/src/notify.h
@@ -0,0 +1,5 @@
+#include <thread>
+#include "overlay_params.h"
+
+extern pthread_t fileChange;
+extern void *fileChanged(void *params_void);
\ No newline at end of file
diff --git a/src/overlay.cpp b/src/overlay.cpp
index 6bd34d8..7d4ccb1 100644
--- a/src/overlay.cpp
+++ b/src/overlay.cpp
@@ -56,6 +56,7 @@
 #include "cpu.h"
 #include "loaders/loader_nvml.h"
 #include "memory.h"
+#include "notify.h"
 
 bool open = false;
 string gpuString;
@@ -2611,6 +2612,7 @@ static VkResult overlay_CreateInstance(
    instance_data_map_physical_devices(instance_data, true);
 
    parse_overlay_config(&instance_data->params, getenv("MANGOHUD_CONFIG"));
+   pthread_create(&fileChange, NULL, &fileChanged, &instance_data->params);
 
    init_cpu_stats(instance_data->params);