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POreceive from unix local socket and buffer size
 

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  1. POreceive from unix local socket and buffer size
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    <p>I'm having a problem with unix local sockets. While reading a message that's longer than my temp buffer size, the request takes too long (maybe indefinitely).</p> <p><strong>Added after some tests:</strong> there is still problem with freeze at ::recv. when I send (1023*8) bytes or less to the UNIX socket - all ok, but when sended more than (1023*9) - i get freeze on recv command. <strong>maybe its FreeBSD default UNIX socket limit or C++ default socket settings? Who know?</strong></p> <hr> <h2>i made some additational tests and I am 100% sure that its "freeze" on the last 9th itteration when executing ::recv command, when trying to read message >= (1023*9) bytes long. (first 8th itterationg going well.)</h2> <p><strong>What I'm doing:</strong> The idea is to read in a do/while loop from a socket with </p> <pre><code>::recv (current_socket, buf, 1024, 0); </code></pre> <p>and check <code>buf</code> for a SPECIAL SYMBOL. If not found:</p> <ol> <li>merge content of buffer to <code>stringxxx += buf;</code></li> <li>bzero temp buf </li> <li>continue the ::recv loop</li> </ol> <p><strong>How do I fix the issue with the request taking too long in the while loop?</strong></p> <p>Is there a better way to clear the buffer? Currently, it's: </p> <pre><code> char buf [1025]; bzero(buf, 1025); </code></pre> <p>But I know bzero is deprecated in the new c++ standard.</p> <p><strong>EDIT:</strong> *<em>"Why need to clean the buffer</em>*</p> <p>I see questions at comments with this question. Without buffer cleanup on the next(last) itteration of reading to the buffer, it will contain the "tail" of first part of the message.</p> <p>Example:</p> <pre><code> // message at the socket is "AAAAAACDE" char buf [6]; ::recv (current_socket, buf, 6, 0); // read 6 symbols, buf = "AAAAAA" // no cleanup, read the last part of the message with recv ::recv (current_socket, buf, 6, 0); // read 6 symbols, but buffer contain only 3 not readed before symbols, therefore // buf now contain "CDEAAA" (not correct, we waiting for CDE only) </code></pre>
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    1. COWhy do you have to clear the buffer?
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      1. POreceive from unix local socket and buffer size
      1. USMartin James
    2. COYou'll know from `recv()`'s return value how many bytes were copied. I'm not sure why you need a special character to know you've gone over your buffer length.
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      1. USchrisaycock
    3. COIs the socket opened in non-blocking mode? See the man page for `fcntl()`.
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      1. USAdam Liss
 

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