Questions tagged [signalhandler]
6 questions
3
votes
0 answers
Is local static variable initialization AS Safe in signal handler (Async Signal Safe)?
I wonder which I can use in my signal handler?
void my_signal_handler(int signo, siginfo_t* info, void* arg) {
static std::atomic_flag my_flag = ATOMIC_FLAG_INIT;
if (my_flag.test_and_set()) {
...
} else {
...
}
…
Justin
- 693
- 1
- 5
- 7
0
votes
0 answers
Memory protection keys: Exception handler crashes if pkey0 is write-disabled
I am interested in inprocess isolation in x86/linux via memory protection keys (MPK) and the protection key register PKRU.
My setup includes administrator code that allocates memory with specific access privileges via MPK, moves the user stack…
Robert Kueffner
- 1
- 1
0
votes
1 answer
Signal handler example
I am trying to understand how signal handler work. I saw an example on geeksforgeek:
int val = 10;
void handler(int sig){
val += 5;
}
int main(){
pid_t pid;
signal(SIGCHLD, handler);
if((pid = fork()) == 0){
val -= 3;
…
Joseph Cheng
- 1
- 2
0
votes
3 answers
Can we send parameters to a signal handler using sigaction?
I notice that sigaction has a alternate signal handler that is called when the SA_SIGINFO flag is set. The alternate function has a void* context parameter. Now, according to the APUE book, this parameter can be cast into a ucontext_t structure. My…
ShayakSarkar
- 31
- 7
0
votes
1 answer
C Two child process sending signal to parent, parent replies
I have a problem sending multiple signals to parent process in c.
I've been trying for a long time now and I still end up in a deadlock or a waitlock.
But I think it shouldn't be that complicated, I simply can't understand what is going on..
So I…
Shapperd
- 155
- 8
-1
votes
0 answers
UNIX signal handler, wait for previous signal
In APUE, in section 10.10, after figure 10.7, the following paragraph was written
1- If the caller already has an alarm set, that alarm is erased by the first call to
alarm(). We can correct this by looking at alarm()’s return value. If the…
tahzibi
- 77
- 6