...these two signals if they are specified in the signal set argument of these calls. • The sigprocmask (2) and pthread_sigmask (3) interfaces silently ignore attempts to block the…...its signal mask using pthread_sigmask (3). In a traditional single-threaded application, sigprocmask (2) can be used to manipulate the signal mask. A child created via fork (2) …...o : epoll_pwait (2), ppoll (2), pselect (2), sigaction (2), signalfd (2), sigpending (2), sigprocmask (2), sigsuspend (2), sigwaitinfo (2), signal (7) NOTES The structures descr…...jmp (3) Added in POSIX.1-2008 TC2; see notes below signal (2) sigpause (3) sigpending (2) sigprocmask (2) sigqueue (2) sigset (3) sigsuspend (2) sleep (3) sockatmark (3) Added i…...ls up to the limit of _NSIG and resetting them to SIG_DFL . 3.Reset the signal mask using sigprocmask() . 4.Sanitize the environment block, removing or resetting environment var…