2  *  Copyright 2023-2024 The OpenSSL Project Authors. All Rights Reserved.
12  * doc/man7/ossl-guide-tls-client-non-block.pod
32     int sock = -1;  in create_socket_bio()
50          * Create a TCP socket. We could equally use non-OpenSSL calls such  in create_socket_bio()
53          * errors on the OpenSSL stack in the event of a failure we use  in create_socket_bio()
57         if (sock == -1)  in create_socket_bio()
58             continue;  in create_socket_bio()
63             sock = -1;  in create_socket_bio()
64             continue;  in create_socket_bio()
69             sock = -1;  in create_socket_bio()
70             continue;  in create_socket_bio()
80     /* If sock is -1 then we've been unable to connect to the server */  in create_socket_bio()
81     if (sock == -1)  in create_socket_bio()
125      * Let's say for example that you want to update the progress counter on  in wait_for_activity()
128      * you check if it did so because of activity on the file descriptors or  in wait_for_activity()
156         return -1;  in handle_io_failure()
160         * If the failure is due to a verification error we can get more  in handle_io_failure()
164             printf("Verify error: %s\n",  in handle_io_failure()
166         return -1;  in handle_io_failure()
169         return -1;  in handle_io_failure()
175  * print the response on the screen.
194         printf("Usage: tls-client-non-block [-6] hostname port\n");  in main()
198     if (!strcmp(argv[argnext], "-6")) {  in main()
200             printf("Usage: tls-client-non-block [-6]  hostname port\n");  in main()
284             continue; /* Retry */  in main()
286         goto end; /* Cannot retry: error */  in main()
292             continue; /* Retry */  in main()
294         goto end; /* Cannot retry: error */  in main()
298             continue; /* Retry */  in main()
300         goto end; /* Cannot retry: error */  in main()
304             continue; /* Retry */  in main()
306         goto end; /* Cannot retry: error */  in main()
317                 continue; /* Retry */  in main()
320                 continue;  in main()
321             case -1:  in main()
324                 goto end; /* Cannot retry: error */  in main()
330          * number of bytes that we read. The data could be non-printable or  in main()
346             continue; /* Retry */  in main()
353         printf("Error shutting down\n");  in main()
354         goto end; /* Cannot retry: error */  in main()
362      * OpenSSL error stack to stderr. There might be some useful diagnostic  in main()