November 2012
Intermediate to advanced
888 pages
54h 46m
Polish
Content preview from Ruby. Receptury
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23.10. Niszczenie wszystkich procesów wybranego użytkownika
Problem
Potrzebny jest łatwy sposób niszczenia wszystkich działających procesów określonego użytkownika, które wymknęły się spod kontroli.
Rozwiązanie
Można skorzystać z metody Process.kill w celu przesłania sygnału systemu Unix (włącznie z „zabójczym” sygnałem SIGTERM lub jeszcze bardziej „zabójczym” sygnałem SIGKILL) z poziomu kodu w Ruby. Jak jednak uzyskać listę procesów wybranego użytkownika? Najprostszym sposobem jest wywołanie uniksowego polecenia ps i przeanalizowanie wyniku. Uruchomienie polecenia ps -u#{nazwa_uzytkownika} zwraca listę procesów wskazanego użytkownika.
#!/usr/bin/ruby -w # banish.rb def signal_all(username, signal) lookup_uid(username) killed = 0 %x{ps ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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