== `execute.hpp`
[#execute]

The execute header provides two error categories:

[source,cpp]
----

// Run a process and wait for it to complete.
template<typename Executor> int execute(basic_process<Executor> proc);
template<typename Executor> int execute(basic_process<Executor> proc, error_code & ec)

// Execute a process asynchronously
template<typename Executor = net::any_io_executor,
        BOOST_PROCESS_V2_COMPLETION_TOKEN_FOR(void (error_code, int))
        WaitHandler = net::default_completion_token_t<Executor>>
auto async_execute(basic_process<Executor> proc,
                         WaitHandler && handler = net::default_completion_token_t<Executor>());
----

The `async_execute` function asynchronously for a process to complete.

 Cancelling the execution will signal the child process to exit
 with the following interpretations:

- `cancellation_type::total`    -> interrupt
- `cancellation_type::partial`  -> request_exit
- `cancellation_type::terminal` -> terminate

It is to note that `async_execute` will use the lowest selected cancellation
type. A subprocess might ignore anything not terminal.