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fperr(2) [bsd man page]

FPERR(2)							System Calls Manual							  FPERR(2)

fperr - get floating-point error registers (2BSD) SYNOPSIS
#include <pdp/fperr.h> struct fperr { short f_fec; caddr_t f_fea; }; fperr(fpe) struct fperr *fpe; DESCRIPTION
Fperr returns the contents of the floating-point processor's error registers as they were following the last floating exception generated by the calling process. The registers are stored in the structure pointed to by fpe. This call is required because the error registers in the PDP-11 floating-point processor are read-only. Thus, they may be changed by some other process between the time that the current process generates an exception and the time that it reads the registers. Therefore, the system saves their state at the time of an exception. The values returned are valid only after a floating-point exception. ERRORS
[EINVAL] The kernel has not been compiled for a processor with floating point. SEE ALSO
Ed Gould, Jim Reeds, Vance Vaughan, UNIX Problems with Floating Point Processors BUGS
Fperr is unique to the PDP-11 and 2BSD; its use is discouraged. 3rd Berkeley Distribution January 22, 1987 FPERR(2)

Check Out this Related Man Page

TRPFPE(3F)																TRPFPE(3F)

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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