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Efficiently test if a port is open on Linux?
From a bash script how can I quickly find out whether a port 445 is open/listening on a server.
14 Answers
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How to set HttpResponse timeout for Android in Java
...s not work, please be aware that HTTP requests, first try to find the host IP with a DNS request and then makes the actual HTTP request to the server, so you may also need to set a timeout for the DNS request.
If your code worked without the timeout for the DNS request it's because you are able to...
C++对象布局及多态探索之菱形结构虚继承 - C/C++ - 清泛网 - 专注C/C++及内核技术
...数据成员应该是祖父类的。因此编译器要调整this指针的位置。而祖父类又是被虚继承，因此要通过偏移值指针指向的偏移值来进行调整。
再观察一下第9行和第12行，可以看到计算出来的地址值是不一样的。这是因为第9...
Remote debugging Tomcat with Eclipse
I can't seem to debug the tomcat application through Eclipse. I've set
16 Answers
16...
How large should my recv buffer be when calling recv in the socket library
I have a few questions about the socket library in C. Here is a snippet of code I'll refer to in my questions.
6 Answers
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Solving a “communications link failure” with JDBC and MySQL [duplicate]
...s at least on person who his problem has been solved with that solution.
Tip: For the solutions that you need to change the MySQL settings, you can refer to the following files:
Linux: /etc/mysql/my.cnf or /etc/my.cnf (depending on the Linux distribution and MySQL package used)
Windows: C:**Progr...
Getting Chrome to accept self-signed localhost certificate
...sicConstraints=CA:FALSE
keyUsage = digitalSignature, nonRepudiation, keyEncipherment, dataEncipherment
subjectAltName = @alt_names
[alt_names]
DNS.1 = $NAME # Be sure to include the domain name here because Common Name is not so commonly honoured by itself
DNS.2 = bar.$NAME # Optionally, add additio...
Linux日志管理Rsyslog入门 - C/C++ - 清泛网 - 专注IT技能提升
...明的是，需要通过配置WorkDirectory来声明状态文件的保存位置，这个状态文件被用来记录扫描日志位置等信息，PersistStateInterval被用来控制状态文件的持久化频率，测试阶段，可以把它设置的小点儿，正式阶段，出于效率的考虑，...
Linux日志管理Rsyslog入门 - C/C++ - 清泛网 - 专注IT技能提升
...明的是，需要通过配置WorkDirectory来声明状态文件的保存位置，这个状态文件被用来记录扫描日志位置等信息，PersistStateInterval被用来控制状态文件的持久化频率，测试阶段，可以把它设置的小点儿，正式阶段，出于效率的考虑，...
Linux日志管理Rsyslog入门 - C/C++ - 清泛网 - 专注IT技能提升
...明的是，需要通过配置WorkDirectory来声明状态文件的保存位置，这个状态文件被用来记录扫描日志位置等信息，PersistStateInterval被用来控制状态文件的持久化频率，测试阶段，可以把它设置的小点儿，正式阶段，出于效率的考虑，...