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server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
...
TLDR:
hostname=XXX
port=443
trust_cert_file_location=`curl-config --ca`
sudo bash -c "echo -n | openssl s_client -showcerts -connect $hostname:$port -servername $hostname \
2>/dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END...
How should strace be used?
...rogrammer / user to quickly find out how a program is interacting with the OS. It does this by monitoring system calls and signals.
Uses
Good for when you don't have source code or don't want to be bothered to really go through it.
Also, useful for your own code if you don't feel like opening up GD...
Determining the last changelist synced to in Perforce
...
I recommend the opposite for automatic build systems: you should first get the latest changelist from the server using:
p4 changes -s submitted -m1
then sync to that change and record it in the revision info. The reason is as follows. Alth...
What happens when a computer program runs?
...
It really depends on the system, but modern OSes with virtual memory tend to load their process images and allocate memory something like this:
+---------+
| stack | function-local variables, return addresses, return values, etc.
| | often grows downward, ...
How to get the home directory in Python?
...
You want to use os.path.expanduser.
This will ensure it works on all platforms:
from os.path import expanduser
home = expanduser("~")
If you're on Python 3.5+ you can use pathlib.Path.home():
from pathlib import Path
home = str(Path.home...
How to get the system uptime in Windows? [closed]
...
Following are eight ways to find the Uptime in Windows OS.
1: By using the Task Manager
In Windows Vista and Windows Server 2008, the Task Manager has been beefed up to show additional information about the system. One of these pieces of info is the server’s running time.
R...
To ARC or not to ARC? What are the pros and cons? [closed]
...y of the code in the project I'm working on at the moment was written pre-iOS 5.0.
6 Answers
...
How do you create a REST client for Java? [closed]
With JSR 311 and its implementations we have a powerful standard for exposing Java objects via REST. However on the client side there seems to be something missing that is comparable to Apache Axis for SOAP - something that hides the web service and marshals the data transparently back to Java objec...
一分钟明白 VS manifest 原理 - C/C++ - 清泛网 - 专注C/C++及内核技术
...pc上，用一组建往往会有不止一个版本（c:/windows/winsxs或系统目录下），程序在加载的时候，不知加载哪个，于是manifest文件来指明。
manifest在哪儿，如何创建。
如果用VS开发，可以Set通过porperty->configuration properties->linker->manifest...
C++中判断文件、目录是否存在的几种方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...式。
二、File
C中也是同样道理，我们可是File的相关操作。
File* fh = fopen("hello","r");
if(fh == NULL)
{
printf("%s","can not open the file");
}
三、_access
当然C中还有一种方式是直接调用c的函数库。
就是函数 int _access(const char* pa...