Not setting error on driver errors

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1014 42af7a65-404d-4744-a932-0658087f49c3

ChangeLog

@@ -492,6 +492,7 @@
 	* Added USB device side driver for the DM320 (untested at initial checkin)
 	* Fixed an error in a previous (post 0.3.15) check-in that broke the LPC214x system timer.
 	* Fixed serial drive bugs related to (1) open counts and (2) recognizing O_NONBLOCK on read.
+	* Fixed an error in read(); it was not setting the errno on errors returned from the driver.
 
 
 

Documentation/NuttX.html

@@ -1082,6 +1082,7 @@ nuttx-0.3.16 2008-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
 	* Added USB device side driver for the DM320 (untested at initial checkin)
 	* Fixed an error in a previous (post 0.3.15) check-in that broke the LPC214x system timer.
 	* Fixed serial drive bugs related to (1) open counts and (2) recognizing O_NONBLOCK on read.
+	* Fixed an error in read(); it was not setting the errno on errors returned from the driver.
 
 pascal-0.1.3 2008-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
 

fs/fs_read.c

@@ -52,14 +52,14 @@
 ssize_t read(int fd, FAR void *buf, size_t nbytes)
 {
   FAR struct filelist *list;
-  int ret = EBADF;
+  int ret = -EBADF;
 
   /* Get the thread-specific file list */
 
   list = sched_getfiles();
   if (!list)
     {
-      *get_errno_ptr() = EMFILE;
+      errno = EMFILE;
       return ERROR;
     }
 
@@ -90,6 +90,17 @@ ssize_t read(int fd, FAR void *buf, size_t nbytes)
             }
         }
     }
+
+  /* If an error occurred, set errno and return -1 (ERROR) */
+
+  if (ret < 0)
+    {
+      errno = -ret;
+      return ERROR;
+    }
+
+  /* Otherwise, return the number of bytes read */
+
   return ret;
 }