-#define cp() { cp_line[cp_index] = __LINE__; cp_file[cp_index] = __FILE__; cp_index++; cp_index %= 16; }
-#define ecp() { fprintf(stderr, "Explicit checkpoint in %s line %d\n", __FILE__, __LINE__); }
+#ifdef HAVE_MINGW
+extern const char *winerror(int);
+#define strerror(x) ((x)>0?strerror(x):winerror(GetLastError()))
+#define sockerrno WSAGetLastError()
+#define sockstrerror(x) winerror(x)
+#define sockwouldblock(x) ((x) == WSAEWOULDBLOCK || (x) == WSAEINTR)
+#define sockmsgsize(x) ((x) == WSAEMSGSIZE)
+#define sockinprogress(x) ((x) == WSAEINPROGRESS || (x) == WSAEWOULDBLOCK)