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-rw-r--r--ext/socket/rubysocket.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/ext/socket/rubysocket.h b/ext/socket/rubysocket.h
index 356e6f3..60ac25f 100644
--- a/ext/socket/rubysocket.h
+++ b/ext/socket/rubysocket.h
@@ -138,6 +138,16 @@ struct sockaddr_storage {
};
#endif
+#if defined __APPLE__ && defined __MACH__
+/*
+ * CMSG_ macros are broken on 64bit darwin, because __DARWIN_ALIGN
+ * aligns up to __darwin_size_t which is 64bit, but CMSG_DATA is
+ * 32bit-aligned.
+ */
+#undef __DARWIN_ALIGNBYTES
+#define __DARWIN_ALIGNBYTES (sizeof(unsigned int) - 1)
+#endif
+
#if defined(_AIX)
#ifndef CMSG_SPACE
# define CMSG_SPACE(len) (_CMSG_ALIGN(sizeof(struct cmsghdr)) + _CMSG_ALIGN(len))