bp::extend::handler in V2?

[db4]

For V1 I used the following trick to kill a child Linux process when its parent dies:

struct ExecHandler : bp::extend::handler
{
    template<typename Executor>
    void on_exec_setup (Executor &) const
    {
        (void)prctl(PR_SET_PDEATHSIG, SIGTERM);
    }
};
...
    bp::child p(
        ExecHandler(),
        ...
    );

Is there anything similar to bp::extend::handler in V2?

[klemens-morgenstern]

Similar code, just without the base-class:

struct ExecHandler 
{

    error_code on_exec_setup(posix::default_launcher & /*launcher*/, const filesystem::path & /* exe*/, const char * const * /* argv*/)
   {
              (void)prctl(PR_SET_PDEATHSIG, SIGTERM);
   }

};

process::v2::process p{..., ExecHandler{}};

[db4]

@klemens-morgenstern, thanks a lot! If you don't mind, I have a similar question regarding Windows. I used to achieve the same effect of killing a process when its parent dies with

            bp::group g;
            bp::child p(
                ...
                g,
                io_service
            );
#ifdef _WIN32
            namespace bpd = bp::detail;
            bpd::api::workaround::JOBOBJECT_EXTENDED_LIMIT_INFORMATION_ info;
            auto h = g.native_handle();
            if (!bpd::api::workaround::query_information_job_object(
                h,
                bpd::api::workaround::JobObjectExtendedLimitInformation_,
                static_cast<void*>(&info),
                sizeof(info),
                nullptr)) {
                bpd::throw_last_error("QueryInformationJobObject() failed");
            }
            info.BasicLimitInformation.LimitFlags |= JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE;
            if (!bpd::api::workaround::set_information_job_object(
                h,
                bpd::api::workaround::JobObjectExtendedLimitInformation_,
                static_cast<void*>(&info),
                sizeof(info))) {
                bpd::throw_last_error("SetInformationJobObject() failed");
            }
#endif

How to do this with V2? With bp::group no longer existing I don't see how to include a process into a group and get the group's handle.

[klemens-morgenstern]

I did not add the group to v2 because there are too many differences between the windows & linux implementation. And it's simple enough, you just got a bit of boilerplate re HANDLEs and error handling.

The whole api::workaround stuff is also moot, because the

You would need to use the job object directly:

#include <windows.h> 
#include <boost/process/windows/creation_flag.hpp>

auto h = ::CreateJobObjectW(nullptr, nullptr); // don't forget the CloseHandle


bp::process proc(..., boost::process::windows::create_breakaway_from_job);

AssignProcessToJobObject(h, proc.native_handle()); // error handling...

// now do with the job object `h` what you have above