TRPFPE(3F)              COMMAND REFERENCE              TRPFPE(3F)



NAME
     trpfpe, fpecnt - trap and repair floating point faults

SYNOPSIS
     subroutine trpfpe (numesg, rtnval)
     double precision rtnval

     integer function fpecnt ()

     common /fpeflt/ fperr
     logical fperr

DESCRIPTION
     Trpfpe sets up a signal handler to trap arithmetic
     exceptions.  If the exception is due to a floating point
     arithmetic fault, the result of the operation is replaced
     with the rtnval specified.  Rtnval must be a double
     precision value.  For example, 0d0 or dflmax().

     The first numesg occurrences of a floating point arithmetic
     error will cause a message to be written to the standard
     error file (stderr).  Any exception that can not be repaired
     will result in the default action, typically an abort with
     core image.

     Fpecnt returns the number of faults since the last call to
     trpfpe.

     The logical value in the common block labeled fpeflt will be
     set to .true. each time a fault occurs.

FILES
     /usr/lib/libF77.a
                    f77 intrinsic function (math) and startup
                    library.

CAVEATS
     There is not a problem with the fixing an operation
     generated by the f77 compiler, but there may be problems in
     fixing an operation in an assembly language routine.

     The CMP and DEI opcodes are not dealt with.

SEE ALSO
     signal(3f) and flmin(3f).










Printed 3/13/89                                                 1

%%index%%
na:312,106;
sy:418,1299;
de:1717,1337;
fi:3054,227;
ca:3281,339;
se:3620,147;
%%index%%000000000111