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Annotation of 43BSDTahoe/man/man3f/trpfpe.3, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1983 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)trpfpe.3f   6.1 (Berkeley) 5/15/85
        !             6: .\"
        !             7: .TH TRPFPE 3F "May 15, 1985"
        !             8: .UC 5
        !             9: .SH NAME
        !            10: trpfpe, fpecnt \- trap and repair floating point faults
        !            11: .SH SYNOPSIS
        !            12: .B subroutine trpfpe (numesg, rtnval)
        !            13: .br
        !            14: .B double precision rtnval
        !            15: .sp 1
        !            16: .B integer function fpecnt ()
        !            17: .sp 1
        !            18: .B common /fpeflt/ fperr
        !            19: .br
        !            20: .B logical fperr
        !            21: .SH DESCRIPTION
        !            22: \fBNOTE: This routine applies only to Vax computers.\fR
        !            23: It is a null routine on the PDP11.
        !            24: .PP
        !            25: .I Trpfpe
        !            26: sets up a signal handler to trap arithmetic exceptions.
        !            27: If the exception is due to a floating point arithmetic fault,
        !            28: the result of the operation is replaced with the
        !            29: .I rtnval
        !            30: specified.
        !            31: .I Rtnval
        !            32: must be a double precision value. For example, ``0d0'' or ``dflmax()''.
        !            33: .PP
        !            34: The first
        !            35: .I numesg
        !            36: occurrences of a floating point arithmetic error will cause a message
        !            37: to be written to the standard error file.
        !            38: Any exception that can't be repaired will result in the default
        !            39: action, typically an abort with core image.
        !            40: .PP
        !            41: .I Fpecnt
        !            42: returns the number of faults since the last call to
        !            43: .IR trpfpe .
        !            44: .PP
        !            45: The logical value in the common block labelled
        !            46: .I fpeflt
        !            47: will be set to
        !            48: .B .true.
        !            49: each time a fault occurs.
        !            50: .SH FILES
        !            51: .ie \nM /usr/ucb/lib/libF77.a
        !            52: .el /usr/lib/libF77.a
        !            53: .SH SEE ALSO
        !            54: signal(3F), range(3F)
        !            55: .SH BUGS
        !            56: This routine works only for
        !            57: .IR faults ,
        !            58: not
        !            59: .IR traps .
        !            60: This is primarily due to the Vax architecture.
        !            61: .PP
        !            62: If the operation involves changing the stack pointer, it can't be repaired.
        !            63: This seldom should be a problem with the f77 compiler, but such an operation
        !            64: might be produced by the optimizer.
        !            65: .PP
        !            66: The POLY and EMOD opcodes are not dealt with.

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