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Full Discussion: C. To segmentation fault or not to segmentation fault, that is the question.
Top Forums Programming C. To segmentation fault or not to segmentation fault, that is the question. Post 303032360 by jim mcnamara on Friday 15th of March 2019 02:49:30 PM
Old 03-15-2019
Code that has problems like that is NOT working, despite your personal point of view. It is undefined behavior. So you understand: undefined behavior means the program is no longer following any rules. It went into lala land. It could limp forward until it hits an exit point, it could format all disks, it could contact the New Horizons spacecraft and order a pizza.

I would say the compiler implementers for the box's C compiler code decided to do some goof-proofing. The limp along option. They likely have a SIGSEGV signal trap? I do not know. If you have a truss equivalent on the box, you can find out if the segmentation fault has been blocked somehow.

I am not trying to be a grumpy old problem monger. But undefined behavior is never "working". Ask Don Cragun or Corona688.
These 3 Users Gave Thanks to jim mcnamara For This Post:
Corona688 Don Cragun wisecracker
 

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LEARN ABOUT BSD

trpfpe

TRPFPE(3F)																TRPFPE(3F)

NAME

       trpfpe, fpecnt - trap and repair floating point faults

SYNOPSIS

       subroutine trpfpe (numesg, rtnval)
       double precision rtnval

       integer function fpecnt ()

       common /fpeflt/ fperr
       logical fperr

DESCRIPTION

       NOTE: This routine applies only to Vax computers.  It is a null routine on the PDP11.

       Trpfpe sets up a signal handler to trap arithmetic exceptions.  If the exception is due to a floating point arithmetic fault, the result of
       the operation is replaced with the rtnval specified.  Rtnval must be a double precision value. For example, ``0d0'' or ``dflmax()''.

       The first numesg occurrences of a floating point arithmetic error will cause a message to be written  to  the  standard	error  file.   Any
       exception that can't be repaired will result in the default action, typically an abort with core image.

       Fpecnt returns the number of faults since the last call to trpfpe.

       The logical value in the common block labelled fpeflt will be set to .true.  each time a fault occurs.

FILES

       /usr/lib/libF77.a

SEE ALSO

       signal(3F), range(3F)

BUGS

       This routine works only for faults, not traps.  This is primarily due to the Vax architecture.

       If  the	operation  involves  changing the stack pointer, it can't be repaired.	This seldom should be a problem with the f77 compiler, but
       such an operation might be produced by the optimizer.

       The POLY and EMOD opcodes are not dealt with.

4.2 Berkeley Distribution					   May 15, 1985 							TRPFPE(3F)
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