freebsd-ports/devel/libsigsegv/pkg-descr

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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/