bug: downloading application will restart during the low network using libcurl.so.4

[?????? via curl-library]

hi dear:
  i  met a problem.
  when i use curl Executable file to download application with  
--limit-rate 10k ?? it will download successfully. however, i use the  libcurl  
to download application. when it almost finish, it will  restart to download , 
the dlnow parameter will be zero, and re-download  the application.  it doesn't 
reach timeout.
  

curl/libcurl version
 
libcurl.so.4.7.0  

curl 7.73.0 (x86_64-pc-linux-gnu)

operating system

 

ubuntu
 
 
./curl --limit-rate 10k -o  
http://139.9.131.244:6080/toms/downloads/APP/FD1C79ED97C1A34A22269865B2CCC7920C4BFFAF1EBA69D90C1020B7260D9873/ECR/0.9.66/ECR_0.9.66.NLD
 
 

 
#include "curl/curl.h"
 #include <stdio.h&gt;
 #include <stdlib.h&gt;
 #include <string.h&gt;
 #include <unistd.h&gt;
 #include <errno.h&gt;
 #include <sys/types.h&gt;
 #include <sys/stat.h&gt;
 #include <dirent.h&gt;
 #include <fcntl.h&gt;
 #include <sys/vfs.h&gt;

#define APP_FAIL (-1)
 #define APP_SUCC (0)

double gunHaveLoadFileSize = 0;

static size_t ProWriteDataFunc(void *buffer, size_t size, size_t nmemb, void 
user_p)
 {
 int nLen = write(((int *)user_p), buffer, size * nmemb);
 printf("dltotal ---- %d---\n", nLen);
 return nLen;
 }

static int HandleProgressCallback(void *clientp, double dltotal, double dlnow, 
double ultotal, double ulnow)
 {
printf("dltotal ---- %lf---- dlnow %lf  have %lf   %lf\n", dltotal, dlnow, 
gunHaveLoadFileSize+ dlnow, gunHaveLoadFileSize); if(dltotal <=0 || dlnow <= 0) 
{     return 0; } printf("process .... %lf   %lf \n", 
dlnow+gunHaveLoadFileSize, dltotal+gunHaveLoadFileSize); return 0; 
}

int main(int argc, char *argv[])
 {
 CURL *pCurl;
 CURLcode res;
 long lnRet;
 int i = 0;
curl_global_init(CURL_GLOBAL_ALL); pCurl = curl_easy_init(); if (NULL == pCurl) 
{       printf("------init----fail----\n");     curl_global_cleanup();  return 
APP_FAIL; } int fd = open(argv[1], O_RDWR|O_CREAT|O_SYNC, 0666); if (fd <= 0){  
 printf("-----open file fail---\n");     curl_easy_cleanup(pCurl);       
curl_global_cleanup();  return APP_FAIL; } curl_easy_setopt(pCurl, CURLOPT_URL, 
argv[2]); 
//    curl_easy_setopt(pCurl, CURLOPT_VERBOSE, 1L);
 //    curl_easy_setopt(pCurl, CURLOPT_DEBUGFUNCTION, ProOnDebug);
 curl_easy_setopt(pCurl, CURLOPT_CONNECTTIMEOUT, 20L);
 curl_easy_setopt(pCurl, CURLOPT_TIMEOUT, 600L);
 curl_easy_setopt(pCurl, CURLOPT_SSL_VERIFYPEER, 0L);
 curl_easy_setopt(pCurl, CURLOPT_SSL_VERIFYHOST, 0L);
 curl_easy_setopt(pCurl, CURLOPT_WRITEFUNCTION, ProWriteDataFunc);
 curl_easy_setopt(pCurl, CURLOPT_FOLLOWLOCATION, 1);
 curl_easy_setopt(pCurl, CURLOPT_WRITEDATA, &amp;fd);
 curl_easy_setopt(pCurl, CURLOPT_PROGRESSDATA, NULL);
curl_easy_setopt(pCurl, CURLOPT_NOPROGRESS, 0); curl_easy_setopt(pCurl, 
CURLOPT_PROGRESSFUNCTION, HandleProgressCallback); curl_easy_setopt(pCurl, 
CURLOPT_MAX_RECV_SPEED_LARGE, (curl_off_t) 10 * 1024); for (i = 0; i<3; i++) {  
     res = curl_easy_perform(pCurl);         if (CURLE_OK == res)            
break; } close(fd); if(res == CURLE_OK) {       res = curl_easy_getinfo(pCurl, 
CURLINFO_RESPONSE_CODE, &amp;lnRet);     if ((CURLE_OK == res) &amp;&amp; 
(lnRet == 200))        {               printf("success :res = %d, lnRet =%d\n", 
res, lnRet);   }       else    {               if(lnRet == 206)                
{                       printf("Partical content 206 SUCC\n");          }       
        else            {                       printf("download fail del 
lfs_del\n");                  remove(argv[1]);                }       } } else 
{     printf("FAIL: res = %d\n", res); } curl_easy_cleanup(pCurl); 
curl_global_cleanup(); return res; 
 

}`
 ./a.out 1.NLD 
http://139.9.131.244:6080/toms/downloads/APP/FD1C79ED97C1A34A22269865B2CCC7920C4BFFAF1EBA69D90C1020B7260D9873/ECR/0.9.66/ECR_0.9.66.NLD
 &gt; 1.txt &amp;







please help me .

&nbsp;thanks
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