Errno_save = errno;/* we can be called by signal handlers */
If (sigprocmask (0, NULL, & sigset) <0)
Err_sys ("sigprocmask error ");
Printf ("% s", str );
If (sigismember (& sigset, SIGINT) printf ("SIGINT ");
If (sigismember (& sigset, SIGQUIT) printf ("SIGQUIT ");
If (sigismember (& sigset, SIGUSR1) printf ("SIGUSR1 ");
If (sigismember (& sigset, SIGALRM) printf ("SIGALRM ");
/* Remaining signals can go here */
Printf ("\ n ");
Errno = errno_save;
Rewrite the above program to process all semaphores. each cycle processes one semaphores in the current blocked word (not every possible semaphores are cyclically ).
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