Function cef_execute_process 

pub unsafe extern "C" fn cef_execute_process(
    args: *const cef_main_args_t,
    application: *mut cef_app_t,
    windows_sandbox_info: *mut c_void,
) -> c_int

This function should be called from the application entry point function to execute a secondary process. It can be used to run secondary processes from the browser client executable (default behavior) or from a separate executable specified by the cef_settings_t.browser_subprocess_path value. If called for the browser process (identified by no “type” command-line value) it will return immediately with a value of -1. If called for a recognized secondary process it will block until the process should exit and then return the process exit code. The |application| parameter may be NULL. The |windows_sandbox_info| parameter is only used on Windows and may be NULL (see cef_sandbox_win.h for details).