1TRAPER(3F)                                                          TRAPER(3F)
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NAME

6       traper - trap arithmetic errors
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SYNOPSIS

9       integer function traper (mask)
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DESCRIPTION

12       NOTE:  This  routine  applies  only  to  the VAX.  It is ignored on the
13       PDP11.
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15       Integer overflow and floating point underflow are not normally  trapped
16       during  execution.  This  routine enables these traps by setting status
17       bits in the process status word. These bits are reset  on  entry  to  a
18       subprogram,  and  the previous state is restored on return.  Therefore,
19       this routine must be called inside each subprogram in which these  con‐
20       ditions  should  be  trapped.   If the condition occurs and trapping is
21       enabled, signal SIGFPE is sent to the process. (See signal(3C))
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23       The argument has the following meaning:
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25               value   meaning
26                 0     do not trap either condition
27                 1     trap integer overflow only
28                 2     trap floating underflow only
29                 3     trap both the above
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31       The previous value of these bits is returned.
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FILES

34       /usr/lib/libF77.a
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SEE ALSO

37       signal(3C), signal(3F)
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414.2 Berkeley Distribution        May 15, 1985                       TRAPER(3F)