... but if errno==EINVAL still fall back to socket+fcntl (Robert Henney)

CHANGES

@@ -27,6 +27,7 @@
   mmap_read/mmap_shared on zero length files no longer fail but return a
     zero length buffer
   if SOCK_NONBLOCK is defined, use it instead of socket+fcntl
+  ... but if errno==EINVAL still fall back to socket+fcntl (Robert Henney)
 
 0.29:
   save 8 bytes in taia.h for 64-bit systems

socket/socket_tcp4.c

@@ -6,14 +6,15 @@
 #endif
 #include "socket.h"
 #include "ndelay.h"
+#include <errno.h>
 
 int socket_tcp4(void) {
+  int s;
 #ifdef SOCK_NONBLOCK
-  return socket(PF_INET,SOCK_STREAM|SOCK_NONBLOCK,IPPROTO_TCP);
+  if ((s=socket(PF_INET,SOCK_STREAM|SOCK_NONBLOCK,IPPROTO_TCP))>-1 || errno!=EINVAL) return -1;
-#else
+#endif
-  int s=socket_tcp4b();
+  s=socket_tcp4b();
   if (s==-1) return -1;
   if (ndelay_on(s) == -1) { close(s); return -1; }
   return s;
-#endif
 }

socket/socket_tcp6.c

@@ -10,12 +10,12 @@
 #include "ndelay.h"
 
 int socket_tcp6(void) {
+  int s;
 #if defined(LIBC_HAS_IP6) && defined(SOCK_NONBLOCK)
-  return socket(PF_INET6,SOCK_STREAM|SOCK_NONBLOCK,IPPROTO_TCP);
+  if ((s=socket(PF_INET6,SOCK_STREAM|SOCK_NONBLOCK,IPPROTO_TCP))>-1 || errno!=EINVAL) return -1;
-#else
+#endif
-  int s=socket_tcp6b();
+  s=socket_tcp6b();
   if (s==-1) return -1;
   if (ndelay_on(s) == -1) { close(s); return -1; }
   return s;
-#endif
 }