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Awk学习笔记 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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14.7. 数组
14.8. awk的内建函数
15. How-to
1. awk简介
awk是一种编程语言，用于在linux/unix下对文本和数据进行处理。数据可以来自标准输入、一个或多个文件，或其它命令的输出。它支持用户自定...
【内核源码】linux UDP实现 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...uct socket *sock, int protocol,
int kern)
{
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list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { //inet_init->inet_register_protosw, inetsw_array
err = 0;
/* Check the non-wild match. */
if (protocol == answer->protocol) {
if (protocol != IPPROTO_IP)
brea...
“Keep Me Logged In” - the best approach
My web application uses sessions to store information about the user once they've logged in, and to maintain that information as they travel from page to page within the app. In this specific application, I'm storing the user_id , first_name and last_name of the person.
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std::wstring VS std::string
I am not able to understand the differences between std::string and std::wstring . I know wstring supports wide characters such as Unicode characters. I have got the following questions:
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How to convert a number to string and vice versa in C++
Since this question gets asked about every week, this FAQ might help a lot of users.
4 Answers
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Is there a unique Android device ID?
Do Android devices have a unique ID, and if so, what is a simple way to access it using Java?
52 Answers
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Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
I was looking for the fastest way to popcount large arrays of data. I encountered a very weird effect: Changing the loop variable from unsigned to uint64_t made the performance drop by 50% on my PC.
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How to create a video from images with FFmpeg?
This line worked fine but I want to create a video file from images in another folder.
Image names in my folder are:
4 Answ...
How to get client's IP address using JavaScript?
I need to somehow retrieve the client's IP address using JavaScript; no server side code, not even SSI.
50 Answers
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Swift Beta performance: sorting arrays
I was implementing an algorithm in Swift Beta and noticed that the performance was very poor. After digging deeper I realized that one of the bottlenecks was something as simple as sorting arrays. The relevant part is here:
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