From 0bf8b7903f9e22c0e42f77b92b503f7b1ca19d64 Mon Sep 17 00:00:00 2001
From: hxy7yx <1595670487@qq.com>
Date: Tue, 15 Aug 2023 14:28:42 +0800
Subject: [PATCH] (file):add error code for reading empty files

---
 include/neuron/errcodes.h |  1 +
 plugins/file/file_req.c   | 14 ++++++++++----
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/include/neuron/errcodes.h b/include/neuron/errcodes.h
index e80068bb..9bc72d49 100644
--- a/include/neuron/errcodes.h
+++ b/include/neuron/errcodes.h
@@ -137,6 +137,7 @@ typedef enum {
     NEU_ERR_FILE_OPEN_FAILURE  = 4101,
     NEU_ERR_FILE_READ_FAILURE  = 4102,
     NEU_ERR_FILE_WRITE_FAILURE = 4103,
+    NEU_ERR_FILE_READ_NULL     = 4104,
 
     NEU_ERR_PLUGIN_ERROR_START = 10000,
     NEU_ERR_PLUGIN_ERROR_END   = 20000,
diff --git a/plugins/file/file_req.c b/plugins/file/file_req.c
index 925d95b5..257a08ef 100644
--- a/plugins/file/file_req.c
+++ b/plugins/file/file_req.c
@@ -84,10 +84,16 @@ int file_group_timer(neu_plugin_t *plugin, neu_plugin_group_t *group)
         fseek(f, 0, SEEK_SET);
         int ret = fread(buf, sizeof(char), length, f);
         if (ret == 0) {
-            nlog_warn("read file failed:%s", tag->address);
-            dvalue.type      = NEU_TYPE_ERROR;
-            dvalue.value.i32 = NEU_ERR_FILE_READ_FAILURE;
-
+            if (feof(f)) {
+                nlog_warn("file is empty:%s", tag->address);
+                dvalue.type      = NEU_TYPE_ERROR;
+                dvalue.value.i32 = NEU_ERR_FILE_READ_NULL;
+            } else if (ferror(f)) {
+                nlog_warn("read file failed: %s", tag->address);
+                clearerr(f);
+                dvalue.type      = NEU_TYPE_ERROR;
+                dvalue.value.i32 = NEU_ERR_FILE_READ_FAILURE;
+            }
             fclose(f);
             goto dvalue_result;
         } else if (ret >= NEU_VALUE_SIZE) {