[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;

2 files changed, 23 insertions, 22 deletions

diff --git a/components/drivers/serial/serial.c b/components/drivers/serial/serial.c
index c279490dec..52dd65e17b 100644
--- a/components/drivers/serial/serial.c
+++ b/components/drivers/serial/serial.c
@@ -44,14 +44,14 @@
 #define DEBUG_COLOR
 #include <rtdbg.h>
 
+#ifdef RT_USING_POSIX
+#include <dfs_posix.h>
+#include <dfs_poll.h>
+
 #ifdef RT_USING_POSIX_TERMIOS
 #include <posix_termios.h>
 #endif
 
-#ifdef RT_USING_DFS
-#ifdef RT_USING_DFS_DEVFS
-#include <dfs_posix.h>
-
 /* it's possible the 'getc/putc' is defined by stdio.h in gcc/newlib. */
 #ifdef getc
 #undef getc
@@ -97,7 +97,8 @@ static int serial_fops_open(struct dfs_fd *fd)
         break;
     }
 
-    rt_device_set_rx_indicate(device, serial_fops_rx_ind);
+    if ((fd->flags & O_ACCMODE) != O_WRONLY)
+        rt_device_set_rx_indicate(device, serial_fops_rx_ind);
     ret = rt_device_open(device, flags);
     if (ret == RT_EOK) return 0;
 
@@ -210,7 +211,7 @@ const static struct dfs_file_ops _serial_fops =
     serial_fops_poll,
 };
 #endif
-#endif
+
 /*
  * Serial poll routines
  */
@@ -993,7 +994,7 @@ rt_err_t rt_hw_serial_register(struct rt_serial_device *serial,
     /* register a character device */
     ret = rt_device_register(device, name, flag);
 
-#if defined(RT_USING_DFS) && defined(RT_USING_DFS_DEVFS)
+#if defined(RT_USING_POSIX)
     /* set fops */
     device->fops        = &_serial_fops;
 #endif
diff --git a/components/drivers/src/pipe.c b/components/drivers/src/pipe.c
index bc9ed5f9a2..0553c500ee 100644
--- a/components/drivers/src/pipe.c
+++ b/components/drivers/src/pipe.c
@@ -23,13 +23,13 @@
  */
 #include <rthw.h>
 #include <rtdevice.h>
-#if defined(RT_USING_DFS)
+
+#if defined(RT_USING_POSIX)
 #include <dfs_file.h>
 #include <dfs_posix.h>
-#endif
+#include <dfs_poll.h>
 
-#if defined(RT_USING_DFS) && defined(RT_USING_DFS_DEVFS)
-static int pipe_open(struct dfs_fd *fd)
+static int pipe_fops_open(struct dfs_fd *fd)
 {
     rt_device_t device;
     rt_pipe_t *pipe;
@@ -65,7 +65,7 @@ static int pipe_open(struct dfs_fd *fd)
     return 0;
 }
 
-static int pipe_close(struct dfs_fd *fd)
+static int pipe_fops_close(struct dfs_fd *fd)
 {
     rt_device_t device;
     rt_pipe_t *pipe;
@@ -112,7 +112,7 @@ static int pipe_close(struct dfs_fd *fd)
     return 0;
 }
 
-static int pipe_ioctl(struct dfs_fd *fd, int cmd, void *args)
+static int pipe_fops_ioctl(struct dfs_fd *fd, int cmd, void *args)
 {
     rt_pipe_t *pipe;
     int ret = 0;
@@ -135,7 +135,7 @@ static int pipe_ioctl(struct dfs_fd *fd, int cmd, void *args)
     return ret;
 }
 
-static int pipe_read(struct dfs_fd *fd, void *buf, size_t count)
+static int pipe_fops_read(struct dfs_fd *fd, void *buf, size_t count)
 {
     int len = 0;
     rt_pipe_t *pipe;
@@ -185,7 +185,7 @@ out:
     return len;
 }
 
-static int pipe_write(struct dfs_fd *fd, const void *buf, size_t count)
+static int pipe_fops_write(struct dfs_fd *fd, const void *buf, size_t count)
 {
     int len;
     rt_pipe_t *pipe;
@@ -256,7 +256,7 @@ out:
     return ret;
 }
 
-static int pipe_poll(struct dfs_fd *fd, rt_pollreq_t *req)
+static int pipe_fops_poll(struct dfs_fd *fd, rt_pollreq_t *req)
 {
     int mask = 0;
     rt_pipe_t *pipe;
@@ -308,15 +308,15 @@ static int pipe_poll(struct dfs_fd *fd, rt_pollreq_t *req)
 
 static const struct dfs_file_ops pipe_fops =
 {
-    pipe_open,
-    pipe_close,
-    pipe_ioctl,
-    pipe_read,
-    pipe_write,
+    pipe_fops_open,
+    pipe_fops_close,
+    pipe_fops_ioctl,
+    pipe_fops_read,
+    pipe_fops_write,
     RT_NULL,
     RT_NULL,
     RT_NULL,
-    pipe_poll,
+    pipe_fops_poll,
 };
 
 rt_pipe_t *rt_pipe_create(const char *name)