signals

I'm trying this example that I took from: http://www.cs.cf.ac.uk/Dave/C/node24.html : #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <signal.h> void sighup(); /* routines child will call upon sigtrap */ void sigint(); void sigquit(); main() { int pid; /* get child process */ if ((pid = fork()) < 0) { perror("fork"); exit(1); } if (pid == 0) { /* child */ printf("\nI am the new child!\n\n"); signal(SIGHUP,sighup); /* set function calls */ signal(SIGINT,sigint); signal(SIGQUIT, sigquit); printf("\nChild going to loop...\n\n"); for(;;); /* loop for ever */ } else /* parent */

I am working on linux and I realized that my application was leaving behind daemon processes when I close it with the "Stop" button on Qt creator IDE. I want to handle these cases so the application close the same way as when I close the main window. To write the handlers, I need to know which signals it corresponds to. Digging into QtCreator's code, I can see that QtCreator uses a QProcess internally to launch your app. The red "stop" button is connected to ApplicationLauncher::stop() , which terminates your process in one of two ways depending if it's a GUI app or a console app, but in both

We are attempting to test student code, and in an effort to automate the process, we'd like to detect if a student's code overflows the stack. I've met with some success using the libsigsegv library and its corresponding stackoverflow_install_handler. It works brilliantly, until the student's code blows the stack twice. For example, here's some sample output: [# ~]$ ledit ./interpreter -> (use solution) -> (fun 1 2) *** Stack overflow detected *** -> (fun 1 2) Signal -10 [# ~] The initial " * Stack overflow detected * " is the desirable output. After blowing the stack for the second time, all

Is there a way to block certain signals and unblock other signals in the same set? I just dont seem to get my head around it! An example sigset_t set; sigemptyset(&set); sigaddset(&set, SIGUSR1); // Block signal SIGUSR1 in this thread pthread_sigmask(SIG_BLOCK, &set, NULL); sigaddset(&set, SIGALRM); // Listen to signal SIGUSR2 pthread_sigmask(SIG_UNBLOCK, &set, NULL); pthread_t printer_thread1, printer_thread2; pthread_create(&printer_thread1, NULL, print, (void *)&f1); pthread_create(&printer_thread2, NULL, print, (void *)&f2); bool tl = true; while(1) { if(tl) { // thread1 does something

I am using typescript to build a micro service and handling signals as well. The code was working fine till few days ago but recently it started throwing error. Couldn't find a fix for the issue. code for handling signals. It is just part of the file. src/main.ts enum signals { SIGHUP = 1, SIGINT = 2, SIGTERM = 15 } const shutdown = (signal, value) => { logger.warn("shutdown!") Db.closeAll() process.exit(value) } Object.values(signals).forEach(signal => { process.on(signal, () => { logger.warn(`process received a ${signal} signal`) shutdown(signal, signals[signal]) }) }) When I do ts-node src

I've read every post I could find about how to gracefully handle a script with an asyncio event loop getting terminated with Ctrl-C, and I haven't been able to get any of them to work without printing one or more tracebacks as I do so. The answers are pretty much all over the place, and I haven't been able implement any of them into this small script: import asyncio import datetime import functools import signal async def display_date(loop): end_time = loop.time() + 5.0 while True: print(datetime.datetime.now()) if (loop.time() + 1.0) >= end_time: break await asyncio.sleep(1) def stopper

I am trying to catch signals such as SIGSEGV in my Android NDK app for debugging purpose. For that, I have set up a sigaction that is called. I am now trying to get the stack of the call. The problem is that _Unwind_Backtrace only works on current stack and sigaction runs inside its own stack. So, is there a way to get the stack of the execution pointer that received the signal? (Basically tell _Unwind_Backtrace to unwind another stack than the current?) I should point out that : Using backtrace() and backtrace_symbols() is not an option since those functions are not delivered in the Android

So I have a need to pass around a numpy array in my PyQt Application. I first tried using the new-style signals/slots, defining my signal with: newChunkToProcess = pyqtSignal(np.array()) , however this gives the error: TypeError: Required argument 'object' (pos 1) not found I have worked out how to do this with the old-style signals and slots using self.emit(SIGNAL("newChunkToProcess(PyQt_PyObject)"), np.array([5,1,2])) - (yes, that's just testing data :), but I was wondering, is it possible to do this using the new-style system? The type you're looking for is np.ndarray You can tell this from