jobs.py 文件源码

def wait_for_active_job(signal_to_send=None):
        """
        Wait for the active job to finish, to be killed by SIGINT, or to be
        suspended by ctrl-z.
        """
        _clear_dead_jobs()
        act = builtins.__xonsh_active_job__
        if act is None:
            return
        job = builtins.__xonsh_all_jobs__[act]
        obj = job['obj']
        if job['bg']:
            return
        pgrp = job['pgrp']
        obj.done = False

        # give the terminal over to the fg process
        _give_terminal_to(pgrp)
        # if necessary, send the specified signal to this process
        # (this hook  was added because vim, emacs, etc, seem to need to have
        # the terminal when they receive SIGCONT from the "fg" command)
        if signal_to_send is not None:
            os.kill(obj.pid, signal_to_send)
        _, s = os.waitpid(obj.pid, os.WUNTRACED)
        if os.WIFSTOPPED(s):
            obj.done = True
            job['bg'] = True
            job['status'] = 'stopped'
            print()  # get a newline because ^Z will have been printed
            print_one_job(act)
        elif os.WIFSIGNALED(s):
            print()  # get a newline because ^C will have been printed
        if obj.poll() is not None:
            builtins.__xonsh_active_job__ = None
        _give_terminal_to(_shell_pgrp)  # give terminal back to the shell