1.问题背景
在需要每隔10分钟上传1张图片至远程FTP服务器。在上传间隔因功耗要求会进行休眠。上传了700多张之后。应用程序报错
与libcurl 的CURLE_COULDNT_CONNECT这错误有关，已经限制了产生time_wait的tcp连接的数量。应用程序依旧无法连接FTP服务器。
2.代码参考的是curl官方的实现改的
static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream)
{
curl_off_t nread;
/* in real-world cases, this would probably get this data differently
as this fread() stuff is exactly what the library already would do
by default internally */
size_t retcode = fread(ptr, size, nmemb, stream);
nread = (curl_off_t)retcode;
fprintf(stderr, "*** We read %" CURL_FORMAT_CURL_OFF_T
" bytes from file\n", nread);
return retcode;
}
int ftpupload(char8 *localfile,char8 *remotefile)
{
CURL *curl;
CURLcode res;
FILE *hd_src;
struct stat file_info;
curl_off_t fsize;
char8 errmsg[100];
char8 login[50];
char8 interface[10];
param_GetFtpServerUser(login,interface);
struct curl_slist *headerlist = NULL;
//static const char buf_1 [] = "RNFR " UPLOAD_FILE_AS;
//static const char buf_2 [] = "RNTO " RENAME_FILE_TO;
/* get the file size of the local file */
//printf("localfile:%s\n",localfile);
if(stat(localfile, &file_info)) {
sprintf(errmsg,"ftpupload: Couldn't open '%s': %s\n", localfile, strerror(errno));
log_WriteCurrentMessage(errmsg);
return 1;
}
fsize = (curl_off_t)file_info.st_size;
printf("Local file size: %" CURL_FORMAT_CURL_OFF_T " bytes.\n", fsize);
/* get a FILE * of the same file */
hd_src = fopen(localfile, "rb");
/* In windows, this will init the winsock stuff */
curl_global_init(CURL_GLOBAL_ALL);
/* get a curl handle */
curl = curl_easy_init();
if(curl) {
/* build a list of commands to pass to libcurl */
//headerlist = curl_slist_append(headerlist, buf_1);
//headerlist = curl_slist_append(headerlist, buf_2);
/* we want to use our own read function */
curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
/* enable uploading */
curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
/* specify target */
curl_easy_setopt(curl, CURLOPT_URL, remotefile);
//curl_easy_setopt(curl, CURLOPT_UPLOAD_BUFFERSIZE,204800L);
/* pass in that last of FTP commands to run after the transfer */
//curl_easy_setopt(curl, CURLOPT_POSTQUOTE, headerlist);
/* now specify which file to upload */
curl_easy_setopt(curl, CURLOPT_READDATA, hd_src);
/* Set the size of the file to upload (optional). If you give a *_LARGE
option you MUST make sure that the type of the passed-in argument is a
curl_off_t. If you use CURLOPT_INFILESIZE (without _LARGE) you must
make sure that to pass in a type 'long' argument. */
curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
(curl_off_t)fsize);
curl_easy_setopt(curl, CURLOPT_FTP_CREATE_MISSING_DIRS, 1); //目录不存在时，上传文件时，先创建目录
curl_easy_setopt(curl, CURLOPT_INTERFACE, interface);
curl_easy_setopt(curl, CURLOPT_TIMEOUT, 60);
curl_easy_setopt(curl, CURLOPT_USERPWD,login);
//curl_easy_setopt(curl, CURLOPT_UPLOAD_BUFFERSIZE,120000L);
tman_TaskReportSelf();
/* Now run off and do what you've been told! */
res = curl_easy_perform(curl);
tman_TaskReportSelf();
/* Check for errors */
if(res != CURLE_OK)
{
sprintf(errmsg, "ftpupload: curl_easy_perform() failed: %s",curl_easy_strerror(res));
log_WriteCurrentMessage(errmsg);
}
/* clean up the FTP commands list */
//curl_slist_free_all(headerlist);
/* always cleanup */
curl_easy_cleanup(curl);
}
fclose(hd_src); /* close the local file */
curl_global_cleanup();
if(res!= CURLE_OK)
{
return res;
}
return 0;
}
无法连接FTP服务器 有没有看到更详细的错误信息？
或者懂网络通信的话 使用抓包看一下
你看看是客户端还是服务器端的休眠，应该就是这个原因，如果是服务器端，定时器访问，保持住连接，检查服务器有没有待机或者休眠的设置，关闭掉。