Troubles with signal_child_watch

["Fernando Tarín" <lists im gmail com>]

Hi I'm using the next code to launch a new process but the finished_process function is never executed, can someone help me with this issue?

#include <glibmm.h>
#include <iostream>

#include <unistd.h>

void finished_process(int pid, int ret)
{
    std::cout << "Process finished: " << pid << "|" << ret <<  std::endl;
}

int main()
{
    int stdout_fd, pid;
    Glib::ustring line;
    std::vector<std::string> command;
   
    command.push_back("ls");
   
    try{
        Glib::spawn_async_with_pipes(".", command,
            Glib::SPAWN_SEARCH_PATH, sigc::slot<void>(),
            &pid, NULL, &stdout_fd, NULL);
    }
    catch(Glib::SpawnError &e){
        std::cout << "Error: " << e.what() << std::endl;
        return 0;
    }
   
    Glib::signal_child_watch().connect(sigc::ptr_fun(finished_process),
                       pid);
                      
    Glib::RefPtr<Glib::IOChannel> io = Glib::IOChannel::create_from_fd(stdout_fd);
   
    sleep(5);
   
    while (io->read_line(line) != Glib::IO_STATUS_EOF)
                    std::cout << line;

    io->close();
    close(stdout_fd);
    std::cout << "Exit" << std::endl;
}