reductions, build fixes

plug/Makefile

@@ -1,4 +1,4 @@
-CFLAGS += -shared -fPIE
+CFLAGS += -shared -fPIC
 
 libplug.so: plug.o
 	${LINK.c} $+ -o $@

plug/plug.h

@@ -1,10 +1,12 @@
 #ifndef PLUG_H_
 
+#define _QUOTE(name) #name
+#define QUOTE(name) _QUOTE(name)
 #define BIND(lib, func, func_name) *(void **) (&func) = dlsym(lib, func_name)
+#define PLUGIN(lib, x) BIND(lib, x, QUOTE(x))
 
 typedef void (*plug_t)(void);
-
-static plug_t plug;
+plug_t plug;
 
 #define PLUG_H_
 #endif

src/Makefile

@@ -1,4 +1,5 @@
 CPPFLAGS += -I../plug -L../plug
+LDLIBS += -ldl
 
 plugin: main.o
 	${LINK.c} $+ -o $@ ${LDLIBS}

src/main.c

@@ -12,19 +12,18 @@ main (void)
   void * libplug = NULL;
   while (1)
   {
-    if (libplug) { dlclose(libplug); }
     libplug = dlopen(libplug_fn, RTLD_NOW);
-    BIND(libplug, plug, "plug");
     if (!libplug)
     { fprintf(stderr, "ERR: Cannot load dynamic library %s: %s\n", libplug_fn, dlerror()); }
     else
     {
-      *(void **) (&plug) = dlsym(libplug, "plug");
+      PLUGIN(libplug, plug);
       printf("frame %d: ", x++);
       if (plug)
       { plug(); }
       else
       { fprintf(stderr, "ERR: Cannot find %s symbol in %s: %s\n", "plug", libplug_fn, dlerror()); }
+      dlclose(libplug);
     }
     sleep(2);
   }