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Why does the C preprocessor interpret the word “linux” as the constant “1”?
...le? It could also be > emptyfile.c or : > emptyfile.c or dd if=/etc/passwd of=emptyfile.c count=0 or …
– Jonathan Leffler
Oct 10 '13 at 14:07
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Are iframes considered 'bad practice'? [closed]
...ou are limited to HTML and have no access to a backend like PHP or ASP.NET etc, sometimes an iframe is your only option.
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项目管理实践教程二、源代码控制【Source Control Using VisualSVN Server ...
... Tools】发布后，根据大家的回复，我需要向大家说明几个问题：1 为什么要 在第一篇文章 项目管理实践教程一、工欲善其事，必先利其器【Basic Tools】发布后，根据大家的回复，我需要向大家说明几个问题：
1.为什么要用Visual...
C++STL容器使用经验总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...是为了避免不必要的拷贝。使拷贝动作高效并且防止剥离问题发生的一个简单办法是使容器包含指针而不是对象。
第4条：调用empty而不是检查size()是否为0。
理由很简单：empty对所有的标准容器都是常数时间操作，而对...
Gmail's new image caching is breaking image links in newsletter
...l. When this email will hit the gmail server GoogleImageProxy will try to fetch and store the images from your site to its own proxy server. while fetching the images, GoogleImageProxy found some 404 statuses against your missing images and 403 against some protected images. GoogleImagesProxy has st...
Increasing the maximum number of TCP/IP connections in Linux
... eth0 txqueuelen 5000
echo "/sbin/ifconfig eth0 txqueuelen 5000" >> /etc/rc.local
Similarly bump up the values for net.core.netdev_max_backlog and net.ipv4.tcp_max_syn_backlog. Their default values are 1000 and 1024 respectively.
sysctl net.core.netdev_max_backlog=2000
sysctl net.ipv4.tcp_m...
App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网
...设备标识符。然后，接收器会过滤掉它感兴趣的设备。
问题是：App Inventor 没有内置 UDP，而且我找不到可用的扩展。所以自己动手吧。
注意：
如果智能手机和远程站位于同一个（本地）网络中，则扩展可以完美运行。如果智...
How to prevent buttons from submitting forms
...r not. First thing on validation function is to check that variable value, etc... Too complicated and code does not say what is really wanted.
So the solution is not to have onsubmit on the form tag. Insead put it where it really is needed, on the button.
For the other side, why put onsubmit code ...
Why am I seeing an “origin is not allowed by Access-Control-Allow-Origin” error here? [duplicate]
...e you cannot use jsonp and you MUST rely on a server side proxy (PHP, ASP, etc.). There are plenty of guides related to this topic, just google it!
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Is GET data also encrypted in HTTPS?
...tions on access to its logs than on access to the website's data (DB, file,etc.)? IMHO as long as the data securely access the webserver, all is well. the only people whom have access to the webserver should be considered reliable because if they aren't there's no way you'll prevent them to read th...