Signal Handling--ref

sigemptyset (&block_mask);
/ Block other terminal-generated signals while handler runs. /
sigaddset (&block_mask,SIGINT);
sigaddset (&block_mask,SIGQUIT);
setup_action.sa_handler = catch_stop;
setup_action.sa_mask = block_mask;
setup_action.sa_flags = 0;
sigaction (SIGTSTP,&setup_action,NULL);
}

sigprocmaskwithin your handler to block or unblock signals as you wish.

sigpending. This function is declared in`signal.h'.

intsigpending(sigset_t *set)

Thesigpendingfunction stores information about pending signals inset. If there is a pending signal that is blocked from delivery,then that signal is a member of the returned set. (You can test whether a particular signal is a member of this set usingsigismember; see section.)

The return value is0if successful,and-1on failure.

#include 
#include 
sigset_t base_mask,waiting_mask;
sigemptyset (&base_mask);

sigaddset (&base_mask,SIGINT);

sigaddset (&base_mask,SIGTSTP);
/ Block user interrupts while doing other processing. /

sigprocmask (SIG_SETMASK,&base_mask,NULL);

...
                        
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