TRAPER(3F)                           BSD                            TRAPER(3F)



NAME
     traper - trap arithmetic errors

SYNOPSIS
     integer function traper (mask)

DESCRIPTION
     NOTE: This routine applies only to the VAX.  It is ignored on Apollo
     workstations.

     Integer overflow and floating point underflow are not normally trapped
     during execution. This routine enables these traps by setting status bits
     in the process status word. These bits are reset on entry to a
     subprogram, and the previous state is restored on return.  Therefore,
     this routine must be called inside each subprogram in which these
     conditions should be trapped.  If the condition occurs and trapping is
     enabled, signal SIGFPE is sent to the process. (See signal(3C))

     The argument has the following meaning:

             value   meaning
               0     do not trap either condition
               1     trap integer overflow only
               2     trap floating underflow only
               3     trap both the above

     The previous value of these bits is returned.

FILES
     /usr/lib/libF77.a

SEE ALSO
     signal(3C), signal(3F)