fix(lwip): fix "unistd.h" I/O APIs not declare when disable VFS

dongheng · dongheng · commit bb38fa0ee11c · 2019-06-17T20:36:14.000+08:00
When enable VFS, apps code should include "unistd.h", "sys/ioctl.h" or "fcntl.h" if using "read", "write", "close", "ioctl" and "fcntl".
diff --git a/components/lwip/lwip/src/include/posix/sys/socket.h b/components/lwip/lwip/src/include/posix/sys/socket.h
@@ -33,3 +33,9 @@
 #include "sdkconfig.h"
 
 #include "lwip/sockets.h"
+
+#if !LWIP_POSIX_SOCKETS_IO_NAMES
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#endif /* !LWIP_POSIX_SOCKETS_IO_NAMES */
