Suppose we have a program that calls two functions do_f1() and do_f2() in that order. a. After calling do_f1(), it sends SIGSUR1 signal to its parent.
b. Before calling do_f2 (), it waits for SIGUSR2 signal, which will be sent from another process, so don't worry about who sends the signal SIGUSR2.
You are asked to implement this program and use sigsuspend() to wait for a signal.
// all the necessary libraries are included
do f1() { /* ... */ } /* Suppose these functions are already */
do_f2() { /* ... */} /* implemented for you. So, just use them */
static int sigreceived = 0;
void my_sig_handler (int signo) {
sigreceived = 1;
}
void main() {
struct sigaction act;
sigset_t blockmask, sigmask;
do f1() ;
/* (a) show how to send SIGUSR1 to the parent process */
/* (b) show how to set up the necessary structures and masks and then wait for SIGUSR2 using sigsuspent() */
do_f2();
}
}