Answers to APUE exercises

Answers to APUE exercises-General Linux technology-Linux programming and kernel information. For more information, see the following. Chapter 10, chapter 9, apue
# Include "apue. h"
# Include

Void
Pr_mask (const char * str)
{
Sigset_tsigset;
Interrno_save;

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 ).