xiaoxiang781216 commented on code in PR #19456:
URL: https://github.com/apache/nuttx/pull/19456#discussion_r3613363217
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fs/hostfs/hostfs.c:
##########
@@ -609,6 +609,29 @@ static int hostfs_ioctl(FAR struct file *filep, int cmd,
unsigned long arg)
return ret;
}
+ /* POSIX file locks reach filesystems as private FIOC_* commands after
+ * fcntl() handling in VFS. Backends that can forward non-blocking lock
+ * commands to the host may implement host_fcntl(). Other backends return
+ * -ENOTTY so VFS falls back to NuttX internal file locks. Do not forward
+ * F_SETLKW because a blocking host fcntl() can stop the whole sim OS.
+ */
+
+ if (cmd == FIOC_GETLK)
+ {
+ ret = host_fcntl(hf->fd, F_GETLK, (FAR struct flock *)(uintptr_t)arg);
+ goto out;
+ }
+ else if (cmd == FIOC_SETLK)
+ {
+ ret = host_fcntl(hf->fd, F_SETLK, (FAR struct flock *)(uintptr_t)arg);
+ goto out;
+ }
+ else if (cmd == FIOC_SETLKW)
+ {
+ ret = -ENOTTY;
Review Comment:
let's loop with FIOC_SETLK/sleep
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