My client can not receive data in blocking mode

llf at llf at
Fri Sep 27 15:42:07 UTC 2019

Thank you very much for your reply  .
My server running on centos 7.5 . And client running on windows 10 .
The data seems be cached on the server and not be sent out.  Dose centos  have the same problem? 
I'm not sure what the problem is . 
I would really appreciate if you have any Suggestions.

Best Regards

发件人: John Unsworth
发送时间: 2019-09-27 21:48
收件人: 路连峰; openssl-users
主题: Re: My client can not receive data in blocking mode
You do not say what OS you are running on. Solaris 11 has a known problem with not reporting queued data. This was fixed by SRU-28.

John Unsworth 

From: openssl-users <openssl-users-bounces at> on behalf of 路连峰 <llf at>
Sent: Monday, September 23, 2019 4:55 am
To: openssl-users
Subject: My client can not receive data in blocking mode


I'm using openssl as client in blocking mode , i have a problem .
Sometimes my program can't  receive data , and acctually server has been sent the data to me.
I can only  receive the data by sending another request . Then the data i expected arrived with a new data sent by server .

bool can_read()
            return true;

struct timeval tv = {0 , 100};
       FD_SET(m_socket.fd(), &m_rfds);
int ret = select( m_socket.fd()+1, &m_rfds , NULL, NULL, &tv);
return ret > 0 ;

//this is the main process
int try_receive(char * buf , int len )
if( !can_read())
return -1;

return SSL_read(m_ssl, buf, len);
 Above is my code ,  my program get `false` from `can_read` although the server has sent response data
 I really appreciate your help.
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