In the C Standard Library, signal processing defines how a program handles various signals while it executes. A signal can report some exceptional behavior within the program (such as division by zero), or a signal can report some asynchronous event outside the program (such as someone striking an interactive attention key on a keyboard).
Questions tagged [signal-handling]
290 questions
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Using Ctrl+Z to background a process in a C Shell
I am trying to implement the behaviour of Ctrl+Z in a mini C Shell. My code currently receives the SIGTSTP signal and correctly suspends the process, however I can't seem to get it to move to the background and put the shell process back in the…
Goulash
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1 answer
Ctrl+c kills process, despite signal handling, works on different machine
I am running a C++ application on xubuntu and implemented a signal handler which handles SIGINT. My implementation should be fine, since it is working on all other machines (same OS) - except mine. "Working" means that the signal is received by a…
spmmfycn
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Blocking signals causes boost process not to work
In the code below the class Process can run a process using boost process in asynchronous mode and can kill it if it times out. Now in order to shut it down, I block all the signals in all threads and create a specific thread signal_thread to handle…
bisarch
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2 answers
How to only kill the child process in the foreground?
I am trying to build a shell, and I've managed to code most of the functionality in, however I have a small problem.
Say I type firefox &. Firefox will open up as a background process. The & activates a BG flag that makes the parent not wait for the…
ENBYSS
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4 answers
Create temp dir that is globally known and that gets automagically removed (C++)?
In C++, I have a few functions that need to write to a temp directory. Ideally, only one temp directory gets created that they all write to (to minimize I/O overhead). That directory should be automagically removed when the program exits.
However, I…
Markus
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0 answers
Handler for SIGCHLD signals
The code doesn't work and it goes in loop. I think the error is in the gestore method, that is a handler for SIGCHLD signals. This is the first time I use a handler to capture SIGCHLD signals.
This program continue to casually extracts from 0 to…
user9062823
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1 answer
Handling SIGQUIT with sigwait
I'm writing a multithreaded program which needs to be terminated with the following bash line:
killall -QUIT -w procname
I decided to use a thread to receive some signals I need to handle, like SIGQUIT and SIGUSR1, and to ignore SIGQUIT in the…
Gixuna
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1 answer
QML connect signal from the main component to the child components
I have a Qt application that calls qt_update_values() to the main QML component. I want to send the new values to a specific delegate. How do I connect update_values() from the main component to be received by a specific child component, which is…
laurapons
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Portability of sigaction and sigset_t between Solaris and Linux
I have some legacy code on Solaris platform and I would like to port that to Linux, but I am getting some compilation error on Linux.
On Solaris, I have the following code snippet:
#include
...
void f() {
struct sigaction a;
…
Dr. Debasish Jana
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Signal handling error
When I use my_handler as function there is not error but I can't because I have to use another method there.
If I build code below :
error: invalid use of member functi
on (did you forget the ‘()’ ?)
This is my first program in C++
void…
Bando
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Can you explain the following signal handling behavior in python?
I have the following program:
import socket
import sys
import threading
import signal
class serve(threading.Thread):
def __init__(self):
super(serve, self).__init__()
self.s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
…
amit
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Can I install a signal handler for Boost unit tests?
I've got a lot of Boost unit tests. I can't find the place where I should put my signal handler. There's no main() function in the files in unit tests directory. It seems that main() is hidden in some macros.
In unit_test.hpp I see:
namespace boost…
JimmyY
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How to stop a thread by sending a signal
Suppose a thread is running some code:
// thread
while (_running) // (1)
{
rv = read(...); // (2)
// do something with data
}
We can add a signal handler to stop the thread:
// signal handler
_running =…
Tom Deseyn
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Handling SIGINT in JuliaLang
Is it possible to catch a SIGINT to stop a Julia program from running, but doing so in an "orderly" fashion?
function many_calc(number)
terminated_by_sigint = false
a = rand(number)
where_are_we = 0
for i in eachindex(a)
…
pkofod
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How to find the source code of the default signal handler function?
I wanted to see the source code of the default handler of SIGABRT in Linux C, But I couldn't find it. Would you please mind help to find it?
Aarian P. Aleahmad
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