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Annotation of 43BSDReno/share/man/man3f/traper.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: .\"    @(#)traper.3f   6.1 (Berkeley) 5/15/85
        !             6: .\"
        !             7: .TH TRAPER 3F  "May 15, 1985"
        !             8: .UC 5
        !             9: .SH NAME
        !            10: traper \- trap arithmetic errors
        !            11: .SH SYNOPSIS
        !            12: .B integer function traper (mask)
        !            13: .SH DESCRIPTION
        !            14: \fBNOTE: This routine applies only to the \s-2VAX\s0.
        !            15: It is ignored on the \s-2PDP11\s0.\fR
        !            16: .PP
        !            17: Integer overflow and floating point underflow are not normally
        !            18: trapped during execution. This routine enables these traps by setting
        !            19: status bits in the process status word. These bits are reset on
        !            20: entry to a subprogram, and the previous state is restored on return.
        !            21: Therefore, this routine must be called
        !            22: .I inside
        !            23: each subprogram in which these conditions should be trapped.
        !            24: If the condition occurs and trapping is enabled,
        !            25: signal SIGFPE is sent to the process. (See
        !            26: .IR signal (3C))
        !            27: .PP
        !            28: The argument has the following meaning:
        !            29: .nf
        !            30: 
        !            31:         value   meaning
        !            32:           0     do not trap either condition
        !            33:           1     trap integer overflow only
        !            34:           2     trap floating underflow only
        !            35:           3     trap both the above
        !            36: 
        !            37: .fi
        !            38: The previous value of these bits is returned.
        !            39: .SH FILES
        !            40: .ie \nM /usr/ucb/lib/libF77.a
        !            41: .el /usr/lib/libF77.a
        !            42: .SH "SEE ALSO"
        !            43: signal(3C), signal(3F)

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