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Postfix发信的频率控制几个参数 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...失败的就放弃发送。postfix发信的频率控制有几个:
smtpd_client_connection_rate_limit=5
ip地址连接的频率控制.
smtpd_client_message_rate_limit=5
客户端发送邮件的频率控制.(某种情况下smtpd_client_message_rate_limit和 smtpd_client_connection_rate_limit的效...
Is errno thread-safe?
In errno.h , this variable is declared as extern int errno; so my question is, is it safe to check errno value after some calls or use perror() in multi-threaded code. Is this a thread safe variable? If not, then whats the alternative ?
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Capitalize first letter. MySQL
Does any one know the equivalent to this TSQL in MySQL parlance?
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How to get “wc -l” to print just the number of lines without file name?
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Markup XML解析库下载（Markup.h 和 Markup.cpp） - 源码下载 - 清泛网 - 专注C/C++及内核技术
Markup XML解析库下载（Markup.h 和 Markup.cpp）Markup CMarkup XML解析C++编写的，一个 h，一个 cpp，绿色小巧，直接加入工程源码编译，跨平台。使用方法参见《C++ 读写xml方法整理（持续更新）》Markup h M C++编写的，一个.h，一个.cpp，...
理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
... 语句With语句是什么？Python’s with statement provides a very convenient way of dealing with the situation where you
With语句是什么？
Python’s with statement provides a very convenient way of dealing with the situation where you have to do a setup and teardown to make s...
How do I get current date/time on the Windows command line in a suitable format for usage in a file/
...te: Now that it's 2016 I'd use PowerShell for this unless there's a really compelling backwards-compatible reason for it, particularly because of the regional settings issue with using date . See @npocmaka's https://stackoverflow.com/a/19799236/8479
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A weighted version of random.choice
I needed to write a weighted version of random.choice (each element in the list has a different probability for being selected). This is what I came up with:
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When would anyone use a union? Is it a remnant from the C-only days?
I have learned but don't really get unions. Every C or C++ text I go through introduces them (sometimes in passing), but they tend to give very few practical examples of why or where to use them. When would unions be useful in a modern (or even legacy) case? My only two guesses would be programming ...
How to check if a user is logged in (how to properly use user.is_authenticated)?
I am looking over this website but just can't seem to figure out how to do this as it's not working. I need to check if the current site user is logged in (authenticated), and am trying:
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