unix: move container_of and SAVE_ERRNO to internal.h

src/unix/internal.h

@@ -25,6 +25,8 @@
 #include "uv-common.h"
 #include "uv-eio.h"
 
+#include <stddef.h> /* offsetof */
+
 #if defined(__linux__)
 
 #include <linux/version.h>
@@ -59,6 +61,17 @@
 # define HAVE_FUTIMES
 #endif
 
+#define container_of(ptr, type, member) \
+  ((type *) ((char *) (ptr) - offsetof(type, member)))
+
+#define SAVE_ERRNO(block) \
+  do { \
+    int _saved_errno = errno; \
+    do { block; } while (0); \
+    errno = _saved_errno; \
+  } \
+  while (0);
+
 /* flags */
 enum {
   UV_CLOSING  = 0x00000001, /* uv_close() called but not finished. */

src/unix/linux.c

@@ -22,7 +22,6 @@
 #include "internal.h"
 
 #include <stdint.h>
-#include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
 #include <assert.h>
@@ -35,17 +34,6 @@
 #undef NANOSEC
 #define NANOSEC 1000000000
 
-#define container_of(ptr, type, member) \
-  ((type *) ((char *) (ptr) - offsetof(type, member)))
-
-#define SAVE_ERRNO(block) \
-  do { \
-    int _saved_errno = errno; \
-    do { block; } while (0); \
-    errno = _saved_errno; \
-  } \
-  while (0);
-
 
 /* Don't look aghast, this is exactly how glibc's basename() works. */
 static char* basename_r(const char* path) {