SEI CERT C Coding Standard

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Operating System

Handling FP errors

Linux
Solaris 10
Mac OS X 10.5
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C99 FP functions - These functions are declared in fenv.h [Open Group 04]
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Before fenv.h based functions were standardized; an alternative to using these C99/fenv() functions is using ieee_flags and ieee_handler

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Windows

Structured Exception Handling - user defined handler _fpieee_flt [3MSDN]
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\[1\] IEEE standard for binary floating-point arithmetic
[http://ieeexplore.ieee.org/xpl/standardstoc.jsp?isnumber=1316]
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\[[OpenIntel Group 0401|AA. C References#OpenReferences#Intel Group 0401]\] "
\[fenv.h - Floating point environment\|http://www.opengroup.org/onlinepubs/009695399/basedefs/fenv.h.html"
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\[3\] MSDN - CRT - fpieee_flt
[http://msdn2[Keil 08|AA. C References#Keil 08]\]
\[[MSDN|AA. C References#MSDN]\] "[fpieee_flt (CRT)|http://msdn.microsoft.com/en-us/library/te2k2f2t(VS.80).aspx]

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\[4\] Floating-Point IEEE Filter for Microsoft\* Windows\* 2000 on the Intel® Itanium™ Architecture
[ftp://download.intel.com/software/opensource/libraries/ieee/ieee_filter_windows2000.pdf]

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\[5\] Linux Kernel Floating Point Exception Handler Local Denial of Service Vulnerability
["
\[[Open Group 04|AA. C References#Open Group 04]\] "[fenv.h - Floating point environment|http://www.securityfocusopengroup.comorg/onlinepubs/bid009695399/10538/discuss]
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\[6\] ARM support for floating-point computations
[http://www.keil.com/support/man/docs/armlib/armlib_bihbjiea.htm]\\basedefs/fenv.h.html]"
\[[SecurityFocus 07|AA. C References#SecurityFocus 07]\]

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FLP02-A. Understand the caveats of floating point exceptions      05. Floating Point (FLP)       FLP30-C. Do not use floating point variables as loop counters