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   signal    ( 7 )

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Ошибки (баги) (Bugs)

There are six signals that can be delivered as a consequence of a
       hardware exception: SIGBUS, SIGEMT, SIGFPE, SIGILL, SIGSEGV, and
       SIGTRAP.  Which of these signals is delivered, for any given
       hardware exception, is not documented and does not always make
       sense.

       For example, an invalid memory access that causes delivery of
       SIGSEGV on one CPU architecture may cause delivery of SIGBUS on
       another architecture, or vice versa.

       For another example, using the x86 int instruction with a
       forbidden argument (any number other than 3 or 128) causes
       delivery of SIGSEGV, even though SIGILL would make more sense,
       because of how the CPU reports the forbidden operation to the
       kernel.

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