子进程popen stdout锁定？

Question

嗨，使用时标准输出读取有问题子流程.Popen在

daniel@desktop:~$ python -V
Python 2.7.3

代码如下：（注释代码是我尝试过的一些东西）

^{pr2}$

这是我连接到服务器并断开连接时得到的输出：

daniel@desktop:~/hlds$ python hlds.py 
Auto detecting CPU
Using breakpad crash handler
Using Pentium II Optimised binary.
Setting breakpad minidump AppID = 10
Auto-restarting the server on crash
Forcing breakpad minidump interfaces to load

Looking up breakpad interfaces from steamclient
Console initialized.
Calling BreakpadMiniDumpSystemInit
scandir failed:/home/daniel/hlds/./valve/SAVE
Installing breakpad exception handler for appid(10)/version(5447)
scandir failed:/home/daniel/hlds/./platform/SAVE
Looking up breakpad interfaces from steamclient
Protocol version 48
Calling BreakpadMiniDumpSystemInit

while循环在以下时间后锁定：

Calling BreakpadMiniDumpSystemInit.

但服务器仍在运行，我可以连接，运行命令等。。。在

---

如果我跑：

 ./hlds_run -game cstrike -maxplayers 11 >> stdout.log 2>&1

我得到以下输出标准输出日志公司名称：

daniel@desktop:~/hlds$ cat stdout.log 
Auto detecting CPU
Using Pentium II Optimised binary.
Auto-restarting the server on crash

Console initialized.
Using breakpad crash handler
Setting breakpad minidump AppID = 10
Forcing breakpad minidump interfaces to load
Looking up breakpad interfaces from steamclient
Calling BreakpadMiniDumpSystemInit
Installing breakpad exception handler for appid(10)/version(5447)
scandir failed:/home/daniel/hlds/./valve/SAVE
scandir failed:/home/daniel/hlds/./platform/SAVE
Protocol version 48
Exe version 1.1.2.6/Stdio (cstrike)
Exe build: 14:06:24 Sep 23 2011 (5447)
STEAM Auth Server
Server IP address 127.0.1.1:27015
couldn't exec listip.cfg
couldn't exec banned.cfg
Looking up breakpad interfaces from steamclient
Calling BreakpadMiniDumpSystemInit
scandir failed:/home/daniel/hlds/./valve/SAVE
scandir failed:/home/daniel/hlds/./platform/SAVE

Could not establish connection to Steam servers.
Reconnected to Steam servers.
   VAC secure mode is activated.
ERROR: couldn't open custom.hpk.
JAMES HETFIELD : hello!
Dropped JAMES HETFIELD from server
Reason:  Client sent 'drop'
Sat Apr 14 00:10:54 CEST 2012: Server Quit

但是，如果不执行2>；&1，则仍会在stdout中获取此输出，而其他输出则会在标准输出日志公司名称：

daniel@desktop:~/hlds$ ./hlds_run -game cstrike -maxplayers 11 >> stdout.log
Using breakpad crash handler
Setting breakpad minidump AppID = 10
Forcing breakpad minidump interfaces to load
Looking up breakpad interfaces from steamclient
Calling BreakpadMiniDumpSystemInit
Installing breakpad exception handler for appid(10)/version(5447)
Looking up breakpad interfaces from steamclient
Calling BreakpadMiniDumpSystemInit

尝试创建servermanager和dispatcher作为子流程学习体验：]

感谢大家的帮助！：）

Answer 1

结果是其中一个管道被数据填满，从而阻塞了子进程，而python进程在试图从另一个管道中读取一行时被阻塞，从而导致死锁。您可能希望使用某种轮询（select/poll/epoll），而不是对管道执行阻塞读取。在

一种快速的方法是在while循环中执行非阻塞读取，但这将导致python进程使用大量CPU。在

请参阅select模块的文档，以了解有关以非黑客方式解决问题的更多信息。在

Answer 2

你能用select解决这个问题吗？我发现当我启动SRCDS时，即使是非阻塞，它也不会经过“调用BreakpadMiniDumpSystemInit”：

p = subprocess.Popen(cmd, shell=False, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, close_fds=True)
fcntl.fcntl(p.stdout, fcntl.F_SETFL, fcntl.fcntl(p.stdout, fcntl.F_GETFL) | os.O_NONBLOCK)
print p.stdout.read()

这将打印到“BreakpadMiniDumpSystemInit”消息，进一步调用read（）抛出“Resource temporary unavailable”，直到有内容写入p.stdin。在