TestCmd.py 文件源码

def __init__(self, cmd, bufsize=-1):
                    p2cread, p2cwrite = os.pipe()
                    c2pread, c2pwrite = os.pipe()
                    self.pid = os.fork()
                    if self.pid == 0:
                        # Child
                        os.dup2(p2cread, 0)
                        os.dup2(c2pwrite, 1)
                        os.dup2(c2pwrite, 2)
                        for i in range(3, popen2.MAXFD):
                            try:
                                os.close(i)
                            except: pass
                        try:
                            os.execvp(cmd[0], cmd)
                        finally:
                            os._exit(1)
                        # Shouldn't come here, I guess
                        os._exit(1)
                    os.close(p2cread)
                    self.tochild = os.fdopen(p2cwrite, 'w', bufsize)
                    os.close(c2pwrite)
                    self.fromchild = os.fdopen(c2pread, 'r', bufsize)
                    popen2._active.append(self)