update file example.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@408 bbd45198-f89e-11dd-88c7-29a3b14d5316

1 files changed, 19 insertions, 3 deletions

diff --git a/examples/file/writespeed.c b/examples/file/writespeed.c
index d829d9977b..22b6d565d2 100644
--- a/examples/file/writespeed.c
+++ b/examples/file/writespeed.c
@@ -16,11 +16,11 @@
 

 void writespeed(const char* filename, int total_length, int block_size)

 {

-    int fd;

+    int fd, index, length;

     char *buff_ptr;

     rt_tick_t tick;

 

-    fd = open(filename, 0, O_WRONLY);

+    fd = open(filename, O_WRONLY | O_WRONLY | O_TRUNC, 0);

     if (fd < 0)

     {

         rt_kprintf("open file:%s failed\n", filename);

@@ -37,9 +37,25 @@ void writespeed(const char* filename, int total_length, int block_size)
     }

 

 	/* prepare write data */

+	for (index = 0; index < block_size; index++)

+	{

+		buff_ptr[index] = index;

+	}

+	index = 0;

 

+	/* get the beginning tick */

     tick = rt_tick_get();

-

+	while (index < total_length / block_size)

+	{

+		length = write(fd, buff_ptr, block_size);

+		if (length != block_size)

+		{

+			rt_kprintf("write failed\n");

+			break;

+		}

+		

+		index ++;

+	}

     tick = rt_tick_get() - tick;

 

 	/* close file and release memory */