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Annotation of cci/usr/src/man/man3/trapov.3f, revision 1.1.1.1

1.1       root        1: .TH TRAPOV 3F "18 July 1983"
                      2: .UC 4
                      3: .SH NAME
                      4: trapov \- trap and repair floating point overflow
                      5: .SH SYNOPSIS
                      6: .B subroutine trapov (numesg, rtnval)
                      7: .br
                      8: .B double precision rtnval
                      9: .SH DESCRIPTION
                     10: This call sets up signal handlers to trap arithmetic exceptions
                     11: and the use of illegal operands.
                     12: Trapping arithmetic exceptions allows the user's program to proceed from
                     13: instances of floating point overflow or divide by zero.
                     14: The result of such operations will be an illegal floating point value.
                     15: The subsequent use of the illegal operand will be trapped
                     16: and the operand replaced by the specified value.
                     17: .PP
                     18: The first
                     19: .I numesg
                     20: occurrences of a floating point arithmetic error will cause a message
                     21: to be written to the standard error file.
                     22: If the resulting value is used, the value given for
                     23: .I rtnval
                     24: will replace the illegal operand generated by the arithmetic error.
                     25: .I Rtnval
                     26: must be a double precision value. For example, ``0d0'' or ``dflmax()''.
                     27: .SH FILES
                     28: .ie \nM /usr/ucb/lib/libF77.a
                     29: .el /usr/lib/libF77.a
                     30: .SH SEE ALSO
                     31: trpfpe(3F), signal(3F), range(3F)
                     32: .SH BUGS
                     33: Other arithmetic exceptions can be trapped but not repaired.
                     34: .PP
                     35: There is no way to
                     36: distinguish between an integer value of 32768 and the illegal
                     37: floating point form.
                     38: Therefore such an integer value may get replaced while repairing
                     39: the use of an illegal operand.

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