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Tag: c++

Signal all processes in process group except self

I am writing a program which multiple processes will run concurrently. In this program, there is a need for one process to suspend all other participants temporarily. In order to spare myself the overhead of tabulating all participant process ID’s in a shared page and signaling them individually, I have created a process group that all participants join. To suspend

Multithreading with Semaphor, Mutex and PThread

Me and a friend are currently working on basic multithreading examples for university in c. We’re supposed to solve the producer/consumer problem with a multithreaded buffer. We’ve got a working version using mutex and conditional variables, but trying to solve this using semaphores and mutex were having three major problems. Problem 1: If we start the consumer first he sometimes

Signal Handler Behavior

I have just some questions about the system calls signal, kill and the signal handler. I have this code: 1) I don’t understand why the first printf in the first child, return -1 without a sleep(1) before…seems that the handler is executed after the beginning of the child. 2) When there is a kill to a child, after this, the

What does `exit()` send `status` to, the parent process or the OS kernel?

In Linux, What does exit() send status to, the parent process or the OS kernel? APUE says that exit() performs certain cleanup processing and then returns to the kernel. But when I run a program in shell, the program returns its exit status to the shell which is its parent process. Answer As you’re probably aware, Linux (like most Operating

C NET-SNMP Get and Set specifically via MIB Name, Not OID

I have written and am testing software for a generic SNMP client module in C as well as an implementation using this generic module. I am having trouble getting a get request to work by passing in a MIB name(e.g. sysDescr) instead of an OID(e.g. 1.3.6.1.2.1.1.1). I am successful when I pass in a character array containing the OID to

C++ Command not recognized after fork() and execl() call (Linux)

I’m trying to create a program that can open a terminal browser and navigate through a website. It works fine up until the child process is called. The following error shows up “xdotool: Unknown command: search –onlyvisible –name Terminal windowactivate keydown Down” I’ve tested the command in a separate terminal and it indeed works but it doesn’t get recognized in

Add syscalls to linux kernel

I’m new in working with kernel. I want to add a linked list to my kernel, and I try to fix it like this link : Linux Kernel Programming–Linked List here is code’s that I added to sys.c : syscall defenition: and my struct for linked list: and when I compile the kernel, I saw this error: thanks for your

Process.Start with .NET Core 2.0 on Linux

I am trying to start the default web browser open to a link with Process.Start(). I use Process.Start(“https://www.google.com”), but my .NET Core App crashes with the following: Exception has occurred: CLR/System.ComponentModel.Win32Exception An unhandled exception of type ‘System.ComponentModel.Win32Exception’ occurred in System.Diagnostics.Process.dll: ‘No such file or directory’ at System.Diagnostics.Process.ResolvePath(String filename) at System.Diagnostics.Process.StartCore(ProcessStartInfo startInfo) at System.Diagnostics.Process.Start() at System.Diagnostics.Process.Start(ProcessStartInfo startInfo) at VPGameHelper.Program.Main(String[] args) in

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