boost/boost_1_91_0/libs/process/doc/reference/execute.adoc

execute.hpp

The execute header provides two error categories:

// 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.