Perl Net：：SFTP：：Foreign disconnect未关闭连接

Question

在调用$sftp->disconnect()时，连接不会关闭，Perl脚本处于挂起状态，直到我手动终止进程。

my %sftp_args = ( user => $username, autodie => 1, stderr_discard => 1,more => qw(-v),
                    timeout => $timeout_secs,ssh_cmd => $SSH_PATH );

  my $sftp = Net::SFTP::Foreign->new($remote_host, %sftp_args);

$sftp->disconnect();

 eval {

    local $SIG{ALRM} = sub { die "alarm\n" };
    alarm 25;
    my $retrun = $sftp->disconnect();
    alarm 0;
  };
  my $exception = $@;
  msg("Error Dump".Dumper($exception));
}

下面是我在nohup.out文件中得到的错误。

bash: line 1: 27860 Alarm clock   sftp_connection.pl 

Answer 1

在对net：：sftp：：foreign模块进行分析后，我找到了解决方案。下面是net：：sftp：：foreign模块有一个bug的详细信息，我在perldoc中找到了这个：

On some operating systems, closing the pipes used to communicate  the 
slave SSH process does not terminate it and a work around has to be applied. 
If you find that your scripts hung when the $sftp object gets out of scope,
try setting $Net::SFTP::Foreign::dirty_cleanup to a true value

根据上面的评论，我对我的应用程序进行了修改，现在它运行良好：

my %sftp_args = ( user => $username, autodie => 1, stderr_discard => 1,
                  timeout => $timeout_secs, ssh_cmd => $SSH_PATH, dirty_cleanup => 1 );

my $sftp = Net::SFTP::Foreign->new($remote_host, %sftp_args);
return $sftp;