Fix: Enhance select to support LWIP

Change-Id: I5a23bfea6dae6eade0a276c59c444a44fcb7558e
Signed-off-by: sharath <sharathkumarboyanapally@gmail.com>

3 files changed, 111 insertions, 10 deletions

diff --git a/stacks/lwip_stack/lwip_src/socket/stackx_event.c b/stacks/lwip_stack/lwip_src/socket/stackx_event.c
index 93e47a3..1967ecc 100644
--- a/stacks/lwip_stack/lwip_src/socket/stackx_event.c
+++ b/stacks/lwip_stack/lwip_src/socket/stackx_event.c
@@ -17,13 +17,112 @@
 #include "stackx_spl_share.h"
 #include "common_pal_bitwide_adjust.h"
 #include "stackx_event.h"
-#include <netinet/in.h>
-
-#define FREE_FD_SET(readfd, writefd, exceptfd)  {\
-    if(readfd)\
-        free(readfd);\
-    if(writefd)\
-        free(writefd);\
-    if(exceptfd)\
-        free(exceptfd);\
+
+#define FREE_FD_SET(readfd, writefd, exceptfd) {\
+if(readfd)\
+free(readfd);\
+if(writefd)\
+free(writefd);\
+if(exceptfd)\
+free(exceptfd);\
+}
+
+int
+lwip_try_select (int fdsize, fd_set * fdread, fd_set * fdwrite,
+                 fd_set * fderr, struct timeval *timeout)
+{
+  int i;
+  int nready = 0;
+  nstack_fd_set *read_out;
+  nstack_fd_set *write_out;
+  nstack_fd_set *err_out;
+  nstack_fd_set *readfd = (nstack_fd_set *) fdread;
+  nstack_fd_set *writefd = (nstack_fd_set *) fdwrite;
+  nstack_fd_set *exceptfd = (nstack_fd_set *) fderr;
+  sbr_socket_t *sock;
+  spl_netconn_t *conn;
+
+  if ((fdsize >= NSTACK_SETSIZE) || (fdsize < 0))
+    {
+      return 0;
+    }
+  read_out = malloc (sizeof (nstack_fd_set));
+  write_out = malloc (sizeof (nstack_fd_set));
+  err_out = malloc (sizeof (nstack_fd_set));
+  if ((!read_out) || (!write_out) || (!err_out))
+    {
+      NSPOL_LOGERR ("malloc nstack_fd_set fail");
+      FREE_FD_SET (read_out, write_out, err_out);
+      return -1;
+    }
+  int ret = NSTACK_FD_ZERO (read_out);
+  int ret1 = NSTACK_FD_ZERO (write_out);
+  int ret2 = NSTACK_FD_ZERO (err_out);
+
+  if ((EOK != ret) || (EOK != ret1) || (EOK != ret2))
+    {
+      NSPOL_LOGERR ("NSTACK_FD_ZERO fail");
+      FREE_FD_SET (read_out, write_out, err_out);
+      return -1;
+    }
+
+  for (i = 0; i < fdsize; i++)
+    {
+      if (!((readfd && NSTACK_FD_ISSET (i, readfd))
+            || (writefd && NSTACK_FD_ISSET (i, writefd))
+            || (exceptfd && NSTACK_FD_ISSET (i, exceptfd))))
+        {
+          continue;
+        }
+      sock = sbr_lookup_sk (i);
+      if (sock == NULL)
+        {
+          errno = EBADF;
+          FREE_FD_SET (read_out, write_out, err_out);
+          return -1;
+        }
+      conn = sbr_get_conn (sock);
+      if (!conn)
+        {
+          errno = EBADF;
+          FREE_FD_SET (read_out, write_out, err_out);
+          return -1;
+        }
+      if (readfd && NSTACK_FD_ISSET (i, readfd) &&
+          ((sbr_get_fd_share (sock)->lastdata != NULL)
+           || (conn->rcvevent > 0)))
+        {
+          NSTACK_FD_SET (i, read_out);
+          nready++;
+        }
+      if (writefd && NSTACK_FD_ISSET (i, writefd) && (conn->sendevent != 0))
+        {
+          NSTACK_FD_SET (i, write_out);
+          nready++;
+        }
+      if (exceptfd && NSTACK_FD_ISSET (i, exceptfd) && (conn->errevent != 0))
+        {
+          NSTACK_FD_SET (i, write_out);
+          nready++;
+        }
+    }
+
+  //TODO: need to handle fd_set and nstack_fd_set memory issue
+  if (readfd)
+    {
+      *readfd = *read_out;
+    }
+
+  if (writefd)
+    {
+      *writefd = *write_out;
+    }
+
+  if (exceptfd)
+    {
+      *exceptfd = *err_out;
+    }
+
+  FREE_FD_SET (read_out, write_out, err_out);
+  return nready;
 }
diff --git a/stacks/lwip_stack/src/sbr/sbr_protocol_api.h b/stacks/lwip_stack/src/sbr/sbr_protocol_api.h
index 1c0fb1e..f4e5070 100644
--- a/stacks/lwip_stack/src/sbr/sbr_protocol_api.h
+++ b/stacks/lwip_stack/src/sbr/sbr_protocol_api.h
@@ -89,6 +89,8 @@ int sbr_init_protocol ();
 
 sbr_fdopt *sbr_get_fdopt (int domain, int type, int protocol);
 void sbr_app_touch_in (void);   /*app send its version info to nStackMain */
+int lwip_try_select (int fdsize, fd_set * fdread, fd_set * fdwrite,
+                     fd_set * fderr, struct timeval *timeout);
 
 #ifdef __cplusplus
 /* *INDENT-OFF* */
diff --git a/stacks/lwip_stack/src/sbr/sbr_socket.c b/stacks/lwip_stack/src/sbr/sbr_socket.c
index 47aefda..e335d6c 100644
--- a/stacks/lwip_stack/src/sbr/sbr_socket.c
+++ b/stacks/lwip_stack/src/sbr/sbr_socket.c
@@ -1065,7 +1065,7 @@ SBR_INTERCEPT (int, select,
                (int nfds, fd_set * readfd, fd_set * writefd,
                 fd_set * exceptfd, struct timeval * timeout))
 {
-  return -1;
+  return lwip_try_select (nfds, readfd, writefd, exceptfd, timeout);
 }
 
 SBR_INTERCEPT (unsigned int, ep_getevt,