ASYNC_WAIT_CTX_set_wait_fd
ret = ASYNC_WAIT_CTX_set_wait_fd(waitctx, engine_afalg_id,
if (!ASYNC_WAIT_CTX_set_wait_fd(waitctx, engine_dasync_id, pipefds[0],
int ASYNC_WAIT_CTX_set_wait_fd(ASYNC_WAIT_CTX *ctx, const void *key,
if (!ASYNC_WAIT_CTX_set_wait_fd(waitctx, waitctx, MAGIC_WAIT_FD, NULL, NULL))
if (!ASYNC_WAIT_CTX_set_wait_fd(waitctx, waitctx, MAGIC_WAIT_FD, NULL, NULL))