Signal Handling--ref

/ The child process executes this function. /
void
child_function (void)
{
/ Perform initialization. /
printf ("I'm here!!! My pid is %d.n",(int) getpid ());

/ Let parent know you're done. /
kill (getppid (),SIGUSR1);

/ Continue with execution. /
puts ("Bye,now....");
exit (0);
}

int
main (void)
{
struct sigaction usr_action;
sigset_t block_mask;
pid_t child_id;

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