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04_day/hal/led.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+
+typedef struct module
+{
+	void (*on)();
+	void (*off)();
+} module_t;
+
+void ledOn()
+{
+	printf("ledOn()\n");
+}
+
+void ledOff()
+{
+	printf("ledOff()\n");
+}
+
+module_t  HMI = { ledOn, ledOff };

04_day/hal/main.c

@@ -0,0 +1,19 @@
+#include <dlfcn.h>
+
+typedef struct module
+{
+	void (*on)();
+	void (*off)();
+} module_t;
+
+int main()
+{
+    void *handle;
+	module_t *module;
+	handle = dlopen("libled.so", RTLD_NOW);
+	module = dlsym( handle, "HMI" );
+	module->on();
+	module->off();
+	dlclose(handle);
+	return 0;
+}