perl:IPC::Open3无法使用FCGI打开STDERR

Question

我用fcgi脚本测试Git:：Repository。我既不能创建git对象，也不能使用该模块运行任何git命令。IPC:：Open3:：Open3失败，错误为：

在/usr/local/lib/perl/5.10.1/FCGI.pm第125行中没有GLOB参考

我在FCGI:：OPEN（）中添加了一个提示，在IPC:：Open3:：xopen（）中增加了一个警告，下面是我得到的：

mod_fcgid: stderr: IPC::Open3::xopen() called with args: GLOB(0xe92360) <&=5 
mod_fcgid: stderr: IPC::Open3::xopen() called with args: GLOB(0xe92438) >&=9 
mod_fcgid: stderr: IPC::Open3::xopen() called with args: GLOB(0xe92498) >&=12 
mod_fcgid: stderr: FCGI::OPEN() called with args: FCGI::Stream=SCALAR(0x14e43f0) >&=12 
mod_fcgid: stderr:  at /usr/local/lib/perl/5.10.1/FCGI.pm line 125 
mod_fcgid: stderr: tFCGI::Stream::OPEN('FCGI::Stream=SCALAR(0x14e43f0)', '>&=12') called at /usr/share/perl/5.10/IPC/Open3.pm line 67 
mod_fcgid: stderr: tIPC::Open3::xopen('GLOB(0xe92498)', '>&=12') called at /usr/share/perl/5.10/IPC/Open3.pm line 162 
mod_fcgid: stderr: 
mod_fcgid: stderr: tIPC::Open3::_open3('open3', 'MyModule', 'GLOB(0x1a56078)', 'GLOB(0x1906738)', 'GLOB(0x12f5430)' , '/usr/bin/git', '--version') called at /usr/share/perl/5.10/IPC/Open3.pm line 233 
mod_fcgid: stderr: tIPC::Open3::open3('GLOB(0x1a56078)', 'GLOB(0x1906738)', 'GLOB(0x12f5430)', '/usr/bin/git', '--version') called at /usr/local/lib/site_perl/MyModule.pm line 113

FCGI:：OPEN（）仅在STDERR打开时调用。STDIN和STDOUT未到达FCGI:：OPEN（）。我看了看IPC：：Open3，这就是它失败的地方：

if ($dad_rdr ne $dad_err) {
    if ($dup_err) {
        # I have to use a fileno here because in this one case
        # I'm doing a dup but the filehandle might be a reference
        # (from the special case above).
        xopen *STDERR, ">&" . xfileno($dad_err)
            if fileno(STDERR) != xfileno($dad_err);
    } else {
        xclose $dad_err;
        xopen *STDERR, ">&=" . fileno $kid_err;  # this is failing
    }
} else {
    xopen *STDERR, ">&STDOUT" if fileno(STDERR) != fileno(STDOUT);
}

我可以用IPC:：Run:：start代替open3，一切都很好。但我真的很想了解STDERR到底出了什么问题。是FCGI.pm或Open3.pm的错误，还是我做错了什么？

我在debian crush上运行带有libapache2 mod fcgid 1:2.3.6、libfcgi perl 0.71-1和libcgi fast perl 5.10.1的apache 2.2.16。Perl版本为5.10.1。

如何复制：

use CGI::Fast;
use Symbol ();
use IPC::Open3 qw(open3);
while (my $cgi = new CGI::Fast) {
    my $pid;
    my $in  = Symbol::gensym;
    my $out = Symbol::gensym;
    my $err = Symbol::gensym;    
    $pid = open3( $in, $out, $err, '/usr/bin/git', '--version');
}

Answer 1

这应该在最新版本（1.102）的系统命令中修复：https://metacpan.org/release/BOOK/System-Command-1.102。

补丁是https://github.com/book/System-Command/commit/d5009728cc66e5f9bb2057df4be70648571a29cd