From 8566a16a82a595d1ea68369bedaf67ac3adee52b Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Wed, 3 Jan 2018 16:01:40 -0600
Subject: [PATCH] examples/userfs: Add truncate() support for userfs

---
 examples/userfs/userfs_main.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/examples/userfs/userfs_main.c b/examples/userfs/userfs_main.c
index 12d840a96..ed4bd1ad1 100644
--- a/examples/userfs/userfs_main.c
+++ b/examples/userfs/userfs_main.c
@@ -114,6 +114,8 @@ static int     ufstest_dup(FAR void *volinfo, FAR void *oldinfo,
                  FAR void **newinfo);
 static int     ufstest_fstat(FAR void *volinfo, FAR void *openinfo,
                  FAR struct stat *buf);
+static int     ufstest_truncate(FAR void *volinfo, FAR void *openinfo,
+                 off_t *length);
 static int     ufstest_opendir(FAR void *volinfo, FAR const char *relpath,
                  FAR void **dir);
 static int     ufstest_closedir(FAR void *volinfo, FAR void *dir);
@@ -177,6 +179,7 @@ static const struct userfs_operations_s g_ufstest_ops =
   ufstest_sync,
   ufstest_dup,
   ufstest_fstat,
+  ufstest_truncate,
   ufstest_opendir,
   ufstest_closedir,
   ufstest_readdir,
@@ -416,6 +419,12 @@ static int ufstest_fstat(FAR void *volinfo, FAR void *openinfo,
   return OK;
 }
 
+static int ufstest_truncate(FAR void *volinfo, FAR void *openinfo,
+                            off_t *length)
+{
+  return -ENOSYS;
+}
+
 static int ufstest_opendir(FAR void *volinfo, FAR const char *relpath,
                            FAR void **dir)
 {