cmd.py 文件源码

def run_bg(cmd, debug=False, cwd=''):
    # make sure 'cmd' is a list of strings
    if type(cmd) in [str, unicode]:
        cmd = [c for c in cmd.split() if c != '']
    if debug:
        sys.stderr.write(' '.join(cmd)+'\n')
        sys.stderr.flush()

    try:
        ( child_pid, child_fd ) = pty.fork()
    except OSError as e:
        raise RunError(cmd, None, message='pty.fork() failed: %s' % str(e))
    if child_pid == 0:
        try:
            if cwd != '':
                os.chdir(cwd)
            os.execvp(cmd[0], cmd)
        except Exception, e:
            raise RunError(cmd, None, 'os.execvp() failed: %s' % str(e))
    else:
        return child_pid, child_fd