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Annotation of 43BSDTahoe/man/man3f/traper.3, revision 1.1.1.1

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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