framkant · August 29, 2015 14:11 · Dec 16, 2014 · Dec 16, 2014
diff --git a/Hotload b/Hotload
@@ -1,3 +1,5 @@
+// made by @filipwanstrom 
+// public domain / as is
 
 // The main.c file
 #include <stdio.h>

diff --git a/Hotload b/Hotload
@@ -0,0 +1,104 @@
+
+// The main.c file
+#include <stdio.h>
+#include <dlfcn.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+typedef void (*printfunc)(void);
+
+struct Reloadable {
+    char filename[256];
+    char symname[256];
+    printfunc func;
+    void* lib;
+    time_t last_modified;
+};
+
+
+time_t get_mod_time(const char* filename)
+{
+    struct stat file_stat;
+    stat(filename, &file_stat);
+    return file_stat.st_mtime;
+}
+
+void bind_lib(struct Reloadable* r){
+    if(r->lib == NULL) {
+	void* f = dlopen(r->filename, RTLD_LAZY);
+	if(f != NULL) {
+	    r->lib = f;
+	}
+    }else {
+	// unload lib first
+	dlclose(r->lib);
+	void* f = dlopen(r->filename, RTLD_LAZY);
+	if(f != NULL) {
+	    r->lib = f;
+	}
+    }
+    void *func = dlsym(r->lib, r->symname);
+    if (func != NULL) {
+	r->func = (printfunc)(func);
+    }
+
+}
+
+void reload_if_modified(struct Reloadable * reloadable)
+{
+    time_t n = get_mod_time(reloadable->filename);
+    if(n>reloadable->last_modified) {
+	reloadable->last_modified = n;
+	bind_lib(reloadable);	
+    }
+}
+
+void printstuff(struct Reloadable * r)
+{
+    if(r->lib !=NULL && r->func != NULL ) {
+	r->func();
+    }
+
+}
+
+int main (int argc, char **argv)
+{
+    printf("Loading hotreload host\n");
+
+    struct Reloadable reloadable = {
+	"printfuncs.dylib",
+	"printstuff", NULL, NULL, 0
+    };
+    reloadable.last_modified = get_mod_time(reloadable.filename);
+    bind_lib(&reloadable);
+    while(1) {
+	sleep(1);
+	printstuff(&reloadable);
+	reload_if_modified(&reloadable);
+
+    }
+
+    return 1;
+}
+
+// the printfuncs.c file
+#include <stdio.h>
+void printstuff()
+{
+    printf("love is everything\n");
+}
+
+// the makefile
+all: printfuncs hotreload
+
+printfuncs:
+	clang -dynamiclib printfuncs.c -o printfuncs.dylib
+
+hotreload:
+	clang main.c -o hotreload
+
+clean:
+	rm -rf hotreload printfuncs.dylib
+
+
+