From 34cda1cb940ce0bfa606a52d1834c717e82af8ec Mon Sep 17 00:00:00 2001
From: hzcheng <hzcheng@taosdata.com>
Date: Mon, 6 Apr 2020 10:13:34 +0800
Subject: [PATCH] TD-100

---
 src/os/linux/src/tlinux.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/src/os/linux/src/tlinux.c b/src/os/linux/src/tlinux.c
index 780e2903a0..b819514be7 100644
--- a/src/os/linux/src/tlinux.c
+++ b/src/os/linux/src/tlinux.c
@@ -291,6 +291,30 @@ int taosInitTimer(void (*callback)(int), int ms) {
   return 0;
 }
 
+ssize_t tread(int fd, void *buf, size_t count) {
+  size_t  leftbytes = count;
+  ssize_t readbytes;
+  char *  tbuf = (char *)buf;
+
+  while (leftbytes > 0) {
+    readbytes = read(fd, (void *)tbuf, leftbytes);
+    if (readbytes < 0) {
+      if (errno == EINTR) {
+        continue;
+      } else {
+        return -1;
+      }
+    } else if (readbytes == 0) {
+      return (ssize_t)(count - leftbytes);
+    }
+
+    leftbytes -= readbytes;
+    tbuf += readbytes;
+  }
+
+  return (ssize_t)count;
+}
+
 ssize_t tsendfile(int dfd, int sfd, off_t *offset, size_t size) {
   size_t  leftbytes = size;
   ssize_t sentbytes;
@@ -308,6 +332,8 @@ ssize_t tsendfile(int dfd, int sfd, off_t *offset, size_t size) {
       else {
         return -1;
       }
+    } else if (sentbytes == 0) {
+      return (ssize_t)(size - leftbytes);
     }
 
     leftbytes -= sentbytes;