#include <openssl/async.h> #include <openssl/ssl.h> int SSL_waiting_for_async(SSL *s); int SSL_get_all_async_fds(SSL *s, OSSL_ASYNC_FD *fd, size_t *numfds); int SSL_get_changed_async_fds(SSL *s, OSSL_ASYNC_FD *addfd, size_t *numaddfds, OSSL_ASYNC_FD *delfd, size_t *numdelfds);
SSL_get_all_async_fds() returns a list of file descriptor which can be used in a call to select() or poll() to determine whether the current asynchronous operation has completed or not. A completed operation will result in data appearing as "read ready" on the file descriptor (no actual data should be read from the file descriptor). This function should only be called if the SSL object is currently waiting for asynchronous work to complete (i.e. SSL_ERROR_WANT_ASYNC has been received - see SSL_get_error(3)). Typically the list will only contain one file descriptor. However, if multiple asynchronous capable engines are in use then more than one is possible. The number of file descriptors returned is stored in *numfds and the file descriptors themselves are in *fds. The fds parameter may be NULL in which case no file descriptors are returned but *numfds is still populated. It is the callers responsibility to ensure sufficient memory is allocated at *fds so typically this function is called twice (once with a NULL fds parameter and once without).
SSL_get_changed_async_fds() returns a list of the asynchronous file descriptors that have been added and a list that have been deleted since the last SSL_ERROR_WANT_ASYNC was received (or since the SSL object was created if no SSL_ERROR_WANT_ASYNC has been received). Similar to SSL_get_all_async_fds() it is the callers responsibility to ensure that *addfd and *delfd have sufficient memory allocated, although they may be NULL. The number of added fds and the number of deleted fds are stored in *numaddfds and *numdelfds respectively.
SSL_get_all_async_fds() and SSL_get_changed_async_fds() return 1 on success or 0 on error.
Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>.