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+A library for handling page faults in user mode. A page fault occurs
+when a program tries to access to a region of memory that is currently
+not available. Catching and handling a page fault is a useful
+technique for implementing:
+ * pageable virtual memory,
+ * memory-mapped access to persistent databases,
+ * generational garbage collectors,
+ * stack overflow handlers,
+ * distributed shared memory,
+
+WWW: http://libsigsegv.sourceforge.net/