plugin / impl: macOS compatibility

* Code is so magical!

Author: updateing

Makefile

@@ -2,9 +2,14 @@ include config.mk
 
 #### Populate [C|LD]FLAGS ####
 COMMON_CFLAGS := $(CUSTOM_CFLAGS) $(CFLAGS) -Wall -D_GNU_SOURCE
-COMMON_LDFLAGS := $(CUSTOM_LDFLAGS) $(LDFLAGS) -T minieap_init_func.lds
+COMMON_LDFLAGS := $(CUSTOM_LDFLAGS) $(LDFLAGS)
 LIBS += $(CUSTOM_LIBS)
 
+# You are not cross-compiling for macOS on Linux, I guess?
+ifeq ($(shell uname -s),Linux)
+COMMON_LDFLAGS += -T minieap_init_func.lds
+endif
+
 ifeq ($(ENABLE_ICONV),true)
 COMMON_CFLAGS += -DENABLE_ICONV
 ifeq ($(LIBICONV_STANDALONE),true)

if_impl/if_impl.c

@@ -11,8 +11,13 @@ IF_IMPL* sockraw_new();
 IF_IMPL* libpcap_new();
 
 int init_if_impl_list() {
+#ifdef __linux__
     extern IF_IMPL* (*__IF_IMPL_LIST_START__)();
     extern IF_IMPL* (*__IF_IMPL_LIST_END__)(); // They are just location markers, do not care about their content
+#else
+    extern IF_IMPL* (*__IF_IMPL_LIST_START__)() __asm("section$start$__DATA$__ifimplinit");
+    extern IF_IMPL* (*__IF_IMPL_LIST_END__)() __asm("section$end$__DATA$__ifimplinit");
+#endif
     IF_IMPL* (**func)();
     int i = 0;
     for (func = &__IF_IMPL_LIST_START__; func < &__IF_IMPL_LIST_END__; ++i, ++func) {

include/if_impl.h

@@ -20,7 +20,11 @@
 
 #define FRAME_BUF_SIZE 1512
 
+#ifdef __linux__
 #define IF_IMPL_INIT(func) __define_in_init(func, ".ifimplinit")
+#else
+#define IF_IMPL_INIT(func) __define_in_init(func, "__DATA,__ifimplinit")
+#endif
 
 /*
  * Representing an interface driver plugin.

include/module_init.h

@@ -2,6 +2,5 @@
 #define _MINIEAP_MODULE_INIT
 
 #define __define_in_init(func, sect) \
-    static void* __init_##func __attribute__((unused, __section__(sect))) = func;
-
+    static void* __init_##func __attribute__((used, __section__(sect))) = func;
 #endif

include/packet_plugin.h

@@ -5,7 +5,11 @@
 #include "eth_frame.h"
 #include "module_init.h"
 
+#ifdef __linux__
 #define PACKET_PLUGIN_INIT(func) __define_in_init(func, ".pktplugininit")
+#else
+#define PACKET_PLUGIN_INIT(func) __define_in_init(func, "__DATA,__pktplugininit")
+#endif
 
 typedef struct _packet_plugin {
     /*

packet_plugin/packet_plugin.c

@@ -18,8 +18,13 @@ PACKET_PLUGIN* packet_plugin_rjv3_new();
 PACKET_PLUGIN* packet_plugin_printer_new();
 
 int init_packet_plugin_list() {
-    extern PACKET_PLUGIN* (*__PACKET_PLUGIN_LIST_START__)(void);
-    extern PACKET_PLUGIN* (*__PACKET_PLUGIN_LIST_END__)(void);
+#ifdef __linux__
+    extern PACKET_PLUGIN* (*__PACKET_PLUGIN_LIST_START__)();
+    extern PACKET_PLUGIN* (*__PACKET_PLUGIN_LIST_END__)();
+#else
+    extern PACKET_PLUGIN* (*__PACKET_PLUGIN_LIST_START__)() __asm("section$start$__DATA$__pktplugininit");
+    extern PACKET_PLUGIN* (*__PACKET_PLUGIN_LIST_END__)() __asm("section$end$__DATA$__pktplugininit");
+#endif
     PACKET_PLUGIN* (**func)();
     int i = 0;
     for (func = &__PACKET_PLUGIN_LIST_START__; func < &__PACKET_PLUGIN_LIST_END__; ++i, ++func) {