2  *  Copyright 2023-2025 The OpenSSL Project Authors. All Rights Reserved.
12  * doc/man7/ossl-guide-quic-client-non-block.pod
33     int sock = -1;  in create_socket_bio()
51          * Create a UDP socket. We could equally use non-OpenSSL calls such  in create_socket_bio()
54          * errors on the OpenSSL stack in the event of a failure we use  in create_socket_bio()
58         if (sock == -1)  in create_socket_bio()
59             continue;  in create_socket_bio()
64             sock = -1;  in create_socket_bio()
65             continue;  in create_socket_bio()
71             sock = -1;  in create_socket_bio()
72             continue;  in create_socket_bio()
78     if (sock != -1) {  in create_socket_bio()
89     /* If sock is -1 then we've been unable to connect to the server */  in create_socket_bio()
90     if (sock == -1)  in create_socket_bio()
152      * Let's say for example that you want to update the progress counter on  in wait_for_activity()
156      * check if it did so because of activity on the file descriptors or  in wait_for_activity()
179         return -1;  in handle_io_failure()
183          * Some stream fatal error occurred. This could be because of a  in handle_io_failure()
184          * stream reset - or some failure occurred on the underlying  in handle_io_failure()
206          * If the failure is due to a verification error we can get more  in handle_io_failure()
210             printf("Verify error: %s\n",  in handle_io_failure()
212         return -1;  in handle_io_failure()
215         return -1;  in handle_io_failure()
220  * print the response on the screen. Note that HTTP/1.0 over QUIC is
221  * non-standard and will not typically be supported by real world servers. This
243         printf("Usage: quic-client-non-block [-6] hostname port\n");  in main()
247     if (!strcmp(argv[argnext], "-6")) {  in main()
249             printf("Usage: quic-client-non-block [-6] hostname port\n");  in main()
346             continue; /* Retry */  in main()
348         goto end; /* Cannot retry: error */  in main()
354             continue; /* Retry */  in main()
356         goto end; /* Cannot retry: error */  in main()
360             continue; /* Retry */  in main()
362         goto end; /* Cannot retry: error */  in main()
367             continue; /* Retry */  in main()
369         goto end; /* Cannot retry: error */  in main()
380                 continue; /* Retry */  in main()
383                 continue;  in main()
384             case -1:  in main()
387                 goto end; /* Cannot retry: error */  in main()
393          * number of bytes that we read. The data could be non-printable or  in main()
409             continue; /* Retry */  in main()
417      * OpenSSL error stack to stderr. There might be some useful diagnostic  in main()