Enable a signal handler using sigaction in C

Question

  struct sigaction psa;

I have enabled my signal handler in the main function as shown below:

    memset (&psa, 0, sizeof (psa)         


        

Answer 1

#include <stdio.h>
#include <signal.h>

static void pSigHandler(int signo){
    switch (signo) {
            case SIGTSTP:
            printf("TSTP");
            fflush(stdout);
            break;
    }
}

int main(void)
{
    struct sigaction psa;
    psa.sa_handler = pSigHandler;
    sigaction(SIGTSTP, &psa, NULL);
    for(;;) {}
    return 0;
}

Because you need to fflush(stdout)

try with C-z

I'm not even sure if it's safe to use stdio in a signal handler though.

Update: http://bytes.com/topic/c/answers/440109-signal-handler-sigsegv

According to that link, you should not do this.