process

How do I start a process from C#?

As suggested by Matt Hamilton, the quick approach where you have limited control over the process, is to use the static Start method on the System.Diagnostics.Process class… using System.Diagnostics; … Process.Start(“process.exe”); The alternative is to use an instance of the Process class. This allows much more control over the process including scheduling, the type of … Read more

How do I get the application exit code from a Windows command line?

A pseudo environment variable named errorlevel stores the exit code: echo Exit Code is %errorlevel% Also, the if command has a special syntax: if errorlevel See if /? for details. Example @echo off my_nify_exe.exe if errorlevel 1 ( echo Failure Reason Given is %errorlevel% exit /b %errorlevel% ) Warning: If you set an environment variable … Read more

How to start a background process in Python?

While jkp‘s solution works, the newer way of doing things (and the way the documentation recommends) is to use the subprocess module. For simple commands its equivalent, but it offers more options if you want to do something complicated. Example for your case: import subprocess subprocess.Popen([“rm”,”-r”,”some.file”]) This will run rm -r some.file in the background. … Read more

How do I execute a command and get the output of the command within C++ using POSIX?

#include <cstdio> #include <iostream> #include <memory> #include <stdexcept> #include <string> #include <array> std::string exec(const char* cmd) { std::array<char, 128> buffer; std::string result; std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd, “r”), pclose); if (!pipe) { throw std::runtime_error(“popen() failed!”); } while (fgets(buffer.data(), buffer.size(), pipe.get()) != nullptr) { result += buffer.data(); } return result; } Pre-C++11 version: #include <iostream> #include <stdexcept> #include … Read more

Understanding PrimeFaces process/update and JSF f:ajax execute/render attributes

<p:commandXxx process> <p:ajax process> <f:ajax execute> The process attribute is server side and can only affect UIComponents implementing EditableValueHolder (input fields) or ActionSource (command fields). The process attribute tells JSF, using a space-separated list of client IDs, which components exactly must be processed through the entire JSF lifecycle upon (partial) form submit. JSF will then … Read more

Capturing signals in C

You’ll need to use the signal.h library. Here’s a working example in which I capture SIGINT and print a message to STDOUT: #include<stdio.h> #include<signal.h> void sig_handler(int signo) { if (signo == SIGINT) write(0, “Hello\n”, 6); } int main(void) { signal(SIGINT, sig_handler); // Just to testing purposes while(1) sleep(1); return 0; }