[libc] Add RT_USING_POSIX macro.

1. Add macro check in rtdebug.h;
2. Use RT_USING_POSIX for poll/select, stdin etc.
3. Split dfs_posix.h to dfs_posix.h, dfs_poll.h and dfs_select.h;

3 files changed, 102 insertions, 91 deletions

diff --git a/components/dfs/include/dfs_poll.h b/components/dfs/include/dfs_poll.h
new file mode 100644
index 0000000000..cfdf74fbe4
--- /dev/null
+++ b/components/dfs/include/dfs_poll.h
@@ -0,0 +1,37 @@
+#ifndef DFS_POLL_H__
+#define DFS_POLL_H__
+
+#include <rtthread.h>
+
+#ifdef RT_USING_POSIX
+#include <sys/time.h> /* for struct timeval */
+
+#define POLLIN          (0x01)
+#define POLLRDNORM      (0x01)
+#define POLLRDBAND      (0x01)
+#define POLLPRI         (0x01)
+
+#define POLLOUT         (0x02)
+#define POLLWRNORM      (0x02)
+#define POLLWRBAND      (0x02)
+
+#define POLLERR         (0x04)
+#define POLLHUP         (0x08)
+#define POLLNVAL        (0x10)
+
+#define POLLMASK_DEFAULT (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)
+
+typedef unsigned int nfds_t;
+
+struct pollfd
+{
+    int fd;
+    short events;
+    short revents;
+};
+
+int poll(struct pollfd *fds, nfds_t nfds, int timeout);
+#endif
+
+#endif
+
diff --git a/components/dfs/include/dfs_posix.h b/components/dfs/include/dfs_posix.h
index e775474f0a..b0fe2041ab 100644
--- a/components/dfs/include/dfs_posix.h
+++ b/components/dfs/include/dfs_posix.h
@@ -28,7 +28,6 @@
 #define __DFS_POSIX_H__
 
 #include <dfs_file.h>
-#include <sys/time.h> /* for struct timeval */
 
 #ifdef __cplusplus
 extern "C" {
@@ -81,96 +80,6 @@ int access(const char *path, int amode);
 int pipe(int fildes[2]);
 int mkfifo(const char *path, mode_t mode);
 
-/* poll and select */
-
-#define POLLIN          (0x01)
-#define POLLRDNORM      (0x01)
-#define POLLRDBAND      (0x01)
-#define POLLPRI         (0x01)
-
-#define POLLOUT         (0x02)
-#define POLLWRNORM      (0x02)
-#define POLLWRBAND      (0x02)
-
-#define POLLERR         (0x04)
-#define POLLHUP         (0x08)
-#define POLLNVAL        (0x10)
-
-#define POLLMASK_DEFAULT (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)
-
-typedef unsigned int nfds_t;
-
-struct pollfd
-{
-    int fd;
-    short events;
-    short revents;
-};
-
-int poll(struct pollfd *fds, nfds_t nfds, int timeout);
-
-
-#ifdef RT_USING_LWIP
-/* we use lwIP's structure definitions. */
-#include <lwip/sockets.h>
-#else
-
-#ifndef FD_SET
-
-/* Get the total number of descriptors that we will have to support */
-
-#define FD_SETSIZE (12)
-
-/* We will use a 32-bit bitsets to represent the set of descriptors.  How
- * many uint32_t's do we need to span all descriptors?
- */
-
-#if FD_SETSIZE <= 32
-#  define __SELECT_NUINT32 1
-#elif FD_SETSIZE <= 64
-#  define __SELECT_NUINT32 2
-#elif FD_SETSIZE <= 96
-#  define __SELECT_NUINT32 3
-#elif FD_SETSIZE <= 128
-#  define __SELECT_NUINT32 4
-#elif FD_SETSIZE <= 160
-#  define __SELECT_NUINT32 5
-#elif FD_SETSIZE <= 192
-#  define __SELECT_NUINT32 6
-#elif FD_SETSIZE <= 224
-#  define __SELECT_NUINT32 7
-#elif FD_SETSIZE <= 256
-#  define __SELECT_NUINT32 8
-#else
-#  warning "Larger fd_set needed"
-#endif
-
-/* These macros map a file descriptor to an index and bit number */
-
-#define _FD_NDX(fd)    ((fd) >> 5)
-#define _FD_BIT(fd)      ((fd) & 0x1f)
-
-/* Standard helper macros */
-
-#define FD_CLR(fd,set) \
-  ((((fd_set*)(set))->arr)[_FD_NDX(fd)] &= ~(1 << _FD_BIT(fd)))
-#define FD_SET(fd,set) \
-  ((((fd_set*)(set))->arr)[_FD_NDX(fd)] |= (1 << _FD_BIT(fd)))
-#define FD_ISSET(fd,set) \
-  (((((fd_set*)(set))->arr)[_FD_NDX(fd)] & (1 << _FD_BIT(fd))) != 0)
-#define FD_ZERO(set) \
-   memset((set), 0, sizeof(fd_set))
-
-typedef struct
-{
-    uint32_t arr[__SELECT_NUINT32];
-}fd_set;
-#endif
-
-#endif
-
-int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/components/dfs/include/dfs_select.h b/components/dfs/include/dfs_select.h
new file mode 100644
index 0000000000..0b5d6cef17
--- /dev/null
+++ b/components/dfs/include/dfs_select.h
@@ -0,0 +1,65 @@
+#ifndef DFS_SELECT_H__
+#define DFS_SELECT_H__
+
+#ifdef RT_USING_LWIP
+/* we use lwIP's structure definitions. */
+#include <lwip/sockets.h>
+#elif defined(RT_USING_POSIX)
+
+#ifndef FD_SET
+
+/* Get the total number of descriptors that we will have to support */
+
+#define FD_SETSIZE (12)
+
+/* We will use a 32-bit bitsets to represent the set of descriptors.  How
+ * many uint32_t's do we need to span all descriptors?
+ */
+
+#if FD_SETSIZE <= 32
+#  define __SELECT_NUINT32 1
+#elif FD_SETSIZE <= 64
+#  define __SELECT_NUINT32 2
+#elif FD_SETSIZE <= 96
+#  define __SELECT_NUINT32 3
+#elif FD_SETSIZE <= 128
+#  define __SELECT_NUINT32 4
+#elif FD_SETSIZE <= 160
+#  define __SELECT_NUINT32 5
+#elif FD_SETSIZE <= 192
+#  define __SELECT_NUINT32 6
+#elif FD_SETSIZE <= 224
+#  define __SELECT_NUINT32 7
+#elif FD_SETSIZE <= 256
+#  define __SELECT_NUINT32 8
+#else
+#  warning "Larger fd_set needed"
+#endif
+
+/* These macros map a file descriptor to an index and bit number */
+
+#define _FD_NDX(fd)    ((fd) >> 5)
+#define _FD_BIT(fd)      ((fd) & 0x1f)
+
+/* Standard helper macros */
+
+#define FD_CLR(fd,set) \
+  ((((fd_set*)(set))->arr)[_FD_NDX(fd)] &= ~(1 << _FD_BIT(fd)))
+#define FD_SET(fd,set) \
+  ((((fd_set*)(set))->arr)[_FD_NDX(fd)] |= (1 << _FD_BIT(fd)))
+#define FD_ISSET(fd,set) \
+  (((((fd_set*)(set))->arr)[_FD_NDX(fd)] & (1 << _FD_BIT(fd))) != 0)
+#define FD_ZERO(set) \
+   memset((set), 0, sizeof(fd_set))
+
+typedef struct
+{
+    uint32_t arr[__SELECT_NUINT32];
+}fd_set;
+#endif
+
+int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);
+
+#endif  /* end of RT_USING_LWIP */
+
+#endif