Signal Handling--ref

Common ways of getting aSIGSEGVcondition include dereferencing a null or uninitialized pointer,or when you use a pointer to step through an array,but fail to check for the end of the array. It varies among systems whether dereferencing a null pointer generatesSIGSEGVorSIGBUS.

intSIGBUS

This signal is generated when an invalid pointer is dereferenced. LikeSIGSEGV,this signal is typically the result of dereferencing an uninitialized pointer. The difference between the two is thatSIGSEGVindicates an invalid access to valid memory,whileSIGBUSindicates an access to an invalid address. In particular,SIGBUSsignals often result from dereferencing a misaligned pointer,such as referring to a four-word integer at an address not divisible by four. (Each kind of computer has its own requirements for address alignment.)

The name of this signal is an abbreviation for "bus error".

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