Hot reloading: Finally got it working with the stat syscall

boids_game.c

@@ -5,8 +5,10 @@
 #include "boids_game.h"
 #include "lib.h"
 
-#define SCREEN_WIDTH 1300
+// #define SCREEN_WIDTH 1300
-#define SCREEN_HEIGHT 1080
+// #define SCREEN_HEIGHT 1080
+#define SCREEN_WIDTH 800
+#define SCREEN_HEIGHT 600
 
 typedef struct Boid {
     Point position;
@@ -25,6 +27,13 @@ typedef struct GameState {
 static GameState *init() {
     InitWindow(SCREEN_WIDTH, SCREEN_HEIGHT, "Boids");
 
+    int monitor = GetCurrentMonitor();
+    int monitor_width = GetMonitorWidth(monitor);
+    // int monitor_height = GetMonitorHeight(monitor);
+    int win_pos_x = monitor_width - SCREEN_WIDTH - 7;
+    int win_pos_y = 30;
+    SetWindowPosition(win_pos_x, win_pos_y);
+
     SetTargetFPS(60);
 
     GameState *state = malloc(sizeof(struct GameApi));
@@ -99,7 +108,6 @@ static int step(GameState *state) {
         boid->position = Vector2Add(boid->position, boid->velocity);
     }
 
-
     // Update
     BeginDrawing();
     {
@@ -113,7 +121,7 @@ static int step(GameState *state) {
             DrawCircle(boid->position.x, boid->position.y, 27, BLACK);
             DrawCircle(boid->position.x, boid->position.y, 20, GREEN);
         }
-
+        DrawFPS(SCREEN_WIDTH - 80, 10);
     }
     EndDrawing();
     return return_int;

boids_main.c

@@ -2,10 +2,8 @@
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <sys/stat.h>
 #include <dlfcn.h>
-#include <sys/epoll.h>
-#include <sys/inotify.h>
-// #include "inotify-syscalls.h"
 #include "include/raylib.h"
 #include "include/raymath.h"
 #include "boids_game.h"
@@ -15,11 +13,11 @@
 #define TARGET_FPS 60
 
 const char* GAME_LIB = "./libboids.so";
-char epoll_buf[1024];
+char inotify_buf[1024];
 
-struct Game
+struct Game {
-{
     void* handle;
+    ino_t gamelib_id;
     struct GameApi api;
     struct GameState* state;
 };
@@ -27,14 +25,16 @@ struct Game
 #define MAX_EVENTS 1
 
 void load_game(struct Game* game) {
+    struct stat attr;
+    if ((stat(GAME_LIB, &attr) == 0) && (game->gamelib_id != attr.st_ino)) {
         if (game->handle) {
             game->api.unload(game->state);
             dlclose(game->handle);
         }
         void* handle = dlopen(GAME_LIB, RTLD_NOW);
-
         if (handle) {
             game->handle = handle;
+            game->gamelib_id = attr.st_ino;
             const struct GameApi* api = dlsym(game->handle, "GAME_API");
             if (api != NULL) {
                 printf("Loaded API, calling init()\n");
@@ -52,67 +52,16 @@ void load_game(struct Game* game) {
             fprintf(stderr, "Error was: %s\n", dlerror());
             exit(1);
         }
+    }
 }
 
 int main(void) {
-    int fd = inotify_init();
-    if (fd < 0) {
-        fprintf(stderr, "Error initializing inotify\n");
-    }
-    int wd;
-    wd = inotify_add_watch(fd, GAME_LIB, IN_MODIFY);
-
-    // create epoll instance
-    int epollfd = epoll_create1(0);
-    if (epollfd == -1) {
-        fprintf(stderr, "Error creating epoll instance\n");
-    }
-
-    struct epoll_event event;
-    event.events = EPOLLIN;
-    event.data.fd = fd;
-
-    if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &event) == -1) {
-        fprintf(stderr, "Error adding inotify descriptor to epoll\n");
-    }
-
-    struct epoll_event events[MAX_EVENTS];
-
     struct Game game = {0};
-    load_game(&game);
     int should_exit = 0;
     while (should_exit != 1) {
-        int nfds = epoll_wait(epollfd, events, MAX_EVENTS, 0);
-        if (nfds == -1) {
-            fprintf(stderr, "epoll_wait failed\n");
-            break;
-        }
-
-        // printf("%d %d\n", nfds, fd);
-        for (int n = 0; n < nfds; ++n) {
-            // printf("DO I EVER GET CALLED\n", events[n].data.fd, fd);
-            printf("DO I EVER GET CALLED\n");
-            if (events[n].data.fd == fd) {
-                printf("SO has been updated!\n");
-                // This clears the inotify queue so we don't get any more events
-                read(fd, epoll_buf, sizeof(epoll_buf));
         load_game(&game);
-            }
-        }
-
         should_exit = game.api.step(game.state);
-        if (should_exit == 2) {
-            printf("I should exit?\n");
-            load_game(&game);
-            should_exit = 0;
-            usleep(1000);
     }
-    }
-
     game.api.finalize(game.state);
     free(game.state);
-    inotify_rm_watch(fd, wd);
-    close(fd);
-    close(epollfd);
-    // CloseWindow();
 }

hours.org

@@ -22,5 +22,5 @@ CLOCK: [2024-01-09 Tue 10:45]--[2024-01-09 Tue 11:15] =>  0:30
 :END:
 ** <2024-01-10 Wed>
 :LOGBOOK:
-CLOCK: [2024-01-10 Wed 08:10]
+CLOCK: [2024-01-10 Wed 08:10]--[2024-01-10 Wed 09:40] =>  1:30
 :END: