(nuttx) branch master updated: note/noteram: add FIONREAD ioctl to report unread buffer size

[xiaoxiang]

This is an automated email from the ASF dual-hosted git repository.

xiaoxiang pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/nuttx.git


The following commit(s) were added to refs/heads/master by this push:
     new b50c5f66383 note/noteram: add FIONREAD ioctl to report unread buffer 
size
b50c5f66383 is described below

commit b50c5f66383153d0ea72e1ab76a99341591a5046
Author: yukangzhi <yukang...@xiaomi.com>
AuthorDate: Wed May 28 10:49:02 2025 +0800

    note/noteram: add FIONREAD ioctl to report unread buffer size
    
    Add handling for the FIONREAD ioctl in noteram_ioctl to return the
    number of unread bytes in the circular note buffer 
(noteram_unread_length()).
    Validate the argument pointer and return -EINVAL if it is NULL.
    
    Signed-off-by: yukangzhi <yukang...@xiaomi.com>
---
 drivers/note/noteram_driver.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/note/noteram_driver.c b/drivers/note/noteram_driver.c
index 0cca512e41e..d19a4cb454c 100644
--- a/drivers/note/noteram_driver.c
+++ b/drivers/note/noteram_driver.c
@@ -604,6 +604,18 @@ static int noteram_ioctl(FAR struct file *filep, int cmd, 
unsigned long arg)
           }
         break;
 
+      case FIONREAD:
+        if (arg == 0)
+          {
+            ret = -EINVAL;
+          }
+        else
+          {
+            *(FAR unsigned int *)arg = noteram_unread_length(drv);
+            ret = OK;
+          }
+        break;
+
       default:
           break;
     }