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Annotation of 43BSDTahoe/man/man3f/trapov.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: .\"    @(#)trapov.3f   6.1 (Berkeley) 5/15/85
        !             6: .\"
        !             7: .TH TRAPOV 3F "May 15, 1985"
        !             8: .UC 5
        !             9: .SH NAME
        !            10: trapov \- trap and repair floating point overflow
        !            11: .SH SYNOPSIS
        !            12: .B subroutine trapov (numesg, rtnval)
        !            13: .br
        !            14: .B double precision rtnval
        !            15: .SH DESCRIPTION
        !            16: \fBNOTE: This routine applies only to the older VAX 11/780's.
        !            17: VAX computers made or upgraded since spring 1983 handle errors differently.\fR
        !            18: See
        !            19: .IR trpfpe (3F)
        !            20: for the newer error handler.
        !            21: This routine has always been ineffective on the VAX 11/750.
        !            22: It is a null routine on the PDP11.
        !            23: .PP
        !            24: This call sets up signal handlers to trap arithmetic exceptions
        !            25: and the use of illegal operands.
        !            26: Trapping arithmetic exceptions allows the user's program to proceed from
        !            27: instances of floating point overflow or divide by zero.
        !            28: The result of such operations will be an illegal floating point value.
        !            29: The subsequent use of the illegal operand will be trapped
        !            30: and the operand replaced by the specified value.
        !            31: .PP
        !            32: The first
        !            33: .I numesg
        !            34: occurrences of a floating point arithmetic error will cause a message
        !            35: to be written to the standard error file.
        !            36: If the resulting value is used, the value given for
        !            37: .I rtnval
        !            38: will replace the illegal operand generated by the arithmetic error.
        !            39: .I Rtnval
        !            40: must be a double precision value. For example, ``0d0'' or ``dflmax()''.
        !            41: .SH FILES
        !            42: .ie \nM /usr/ucb/lib/libF77.a
        !            43: .el /usr/lib/libF77.a
        !            44: .SH SEE ALSO
        !            45: trpfpe(3F), signal(3F), range(3F)
        !            46: .SH BUGS
        !            47: Other arithmetic exceptions can be trapped but not repaired.
        !            48: .PP
        !            49: There is no way to
        !            50: distinguish between an integer value of 32768 and the illegal
        !            51: floating point form.
        !            52: Therefore such an integer value may get replaced while repairing
        !            53: the use of an illegal operand.

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