net/socket: add SOCK_CLOEXEC/SOCK_NONBLOCK support

Reference here:
https://github.com/torvalds/linux/blob/master/include/linux/net.h

Change-Id: I9fd0170bcd1ae7e778e951d454ada76f63854de5
Signed-off-by: chao.an <anchao@xiaomi.com>

include/sys/socket.h

@@ -108,6 +108,16 @@
                                  */
 #define SOCK_PACKET   10        /* Obsolete and should not be used in new programs */
 
+#define SOCK_CLOEXEC  02000000  /* Atomically set close-on-exec flag for the new
+                                 * descriptor(s).
+                                 */
+#define SOCK_NONBLOCK 00004000  /* Atomically mark descriptor(s) as non-blocking. */
+
+#define SOCK_MAX (SOCK_PACKET + 1)
+#define SOCK_TYPE_MASK 0xf      /* Mask which covers at least up to SOCK_MASK-1.
+                                 * The remaining bits are used as flags.
+                                 */
+
 /* Bits in the FLAGS argument to `send', `recv', et al. These are the bits
  * recognized by Linux, not all are supported by NuttX.
  */

net/socket/socket.c

@@ -86,12 +86,24 @@ int psock_socket(int domain, int type, int protocol,
 
   psock->s_crefs  = 1;
   psock->s_domain = domain;
-  psock->s_type   = type;
   psock->s_conn   = NULL;
 #if defined(CONFIG_NET_TCP_WRITE_BUFFERS) || defined(CONFIG_NET_UDP_WRITE_BUFFERS)
   psock->s_sndcb  = NULL;
 #endif
 
+  if (type & SOCK_CLOEXEC)
+    {
+      psock->s_flags |= _SF_CLOEXEC;
+    }
+
+  if (type & SOCK_NONBLOCK)
+    {
+      psock->s_flags |= _SF_NONBLOCK;
+    }
+
+  type            &= SOCK_TYPE_MASK;
+  psock->s_type   = type;
+
 #ifdef CONFIG_NET_USRSOCK
   if (domain != PF_LOCAL && domain != PF_UNSPEC)
     {