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POC sockets raises error code 22, EINVAL - invalid argument
 

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  1. POC sockets raises error code 22, EINVAL - invalid argument
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    <p>The example code below works as as a server process. But when I add the line</p> <pre><code>pid_t childpid; </code></pre> <p>below</p> <pre><code>struct sockaddr_in servaddr, clientaddr; </code></pre> <p>it fails at line</p> <pre><code>connectfd = accept(listenfd, (struct sockaddr *) &amp;clientaddr, &amp;clientaddrlen); </code></pre> <p>with the error code 22, EINVAL - invalid argument. I'm new to sockets in C and I couldn't understand the problem, can you help me about this?</p> <p>Thanks.</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;sys/types.h&gt; #include &lt;sys/socket.h&gt; #include &lt;linux/in.h&gt; #include &lt;stdlib.h&gt; #include &lt;unistd.h&gt; #include &lt;errno.h&gt; extern int errno; int main() { int clientaddrlen, listenfd, connectfd, bytes_rcvd, listen_queue_size=1; short int port_no = 2000; char buffer[1000]; struct sockaddr_in servaddr, clientaddr; printf("Server running at port #%d\n", port_no); // Create server socket. if ( (listenfd = socket(AF_INET, SOCK_STREAM, 0)) &lt; 0) { fprintf(stderr, "Cannot create server socket! errno=%d \n", errno); exit(-1); } printf("Server socket created\n"); // Bind (attach) this process to the server socket. servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = htonl(INADDR_ANY); servaddr.sin_port = htons(port_no); bind(listenfd, (struct sockaddr *) &amp;servaddr, sizeof(servaddr)); printf("Server socket is bound to port #%d\n", port_no); // Turn 'listenfd' to a listening socket. Listen queue size is 1. listen(listenfd,listen_queue_size); printf("Server listening with a queue of size %d. \n", listen_queue_size); // Wait for connection(s) from client(s). while (1) { connectfd = accept(listenfd, (struct sockaddr *) &amp;clientaddr, &amp;clientaddrlen); printf("A client has connected\n"); if (recv(connectfd, buffer, sizeof(buffer), 0 ) &gt; 0) printf("Received message: %s\n", buffer); close(connectfd); printf("Server closed connection to client\n"); } close(listenfd); return 0; } </code></pre>
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    1. USMarc Gravell
    1. USemrekyv
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    1. COHuh? The program's behavior changes just because you add a non-used variable declaration? That seems ... unlikely, did you paste the wrong line?
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      1. USunwind
    2. COAlso you don't use fork() in this code, despite the title...
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      1. USMatthew Flaschen
    3. COActually, such behaviour is very common. It changes the size of the stack frame and so may expose or hide problems caused by buffer overruns etc.
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