trpfpe(3f) [bsd man page]

TRPFPE(3F)																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

       NOTE: This routine applies only to Vax computers.  It is a null routine on the PDP11.

       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.   Any
       exception that can't 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 labelled fpeflt will be set to .true.  each time a fault occurs.

FILES

       /usr/lib/libF77.a

SEE ALSO

       signal(3F), range(3F)

BUGS

       This routine works only for faults, not traps.  This is primarily due to the Vax architecture.

       If  the	operation  involves  changing the stack pointer, it can't be repaired.	This seldom should be a problem with the f77 compiler, but
       such an operation might be produced by the optimizer.

       The POLY and EMOD opcodes are not dealt with.

4.2 Berkeley Distribution					   May 15, 1985 							TRPFPE(3F)

fegettrapenable(3M)													       fegettrapenable(3M)

NAME

       fegettrapenable() - get floating-point exception trap enables

SYNOPSIS

DESCRIPTION

       The function determines which floating-point exception traps are currently enabled.

USAGE

       To use this function, compile either with the default option or with the and options.  Make sure your program includes

       For  HP	Integrity  servers,  specify  on  the  compiler command line or place the call to this function under the effect of an affirmative
       pragma:

       If the pragma is placed outside of any top-level declarations in a file, the pragma will apply to all declarations in the compilation  fol-
       lowing the pragma until another pragma is encountered or until the end of the file is reached.

       If  the	pragma	is  placed  at the beginning of a block (compound statement), the pragma will apply until another pragma is encountered or
       until the end of the block is reached.

       For PA-RISC, you might need to use the compiler option in order to prevent optimizations that can undermine the specified behavior of  this
       function.

       Link in the math library by specifying on the compiler or linker command line.

       For more information, see the at the following site:

RETURN VALUE

       The  function  returns  the  bitwise OR of the floating-point exception macros corresponding to the currently enabled exception traps.  The
       macros are and represents all the floating-point exceptions.

ERRORS

       No errors are defined.

EXAMPLES

       Retrieve the current trap settings and determine whether a trap for the divide by zero exception is enabled.

AUTHOR

       was developed by HP and is not required by any current standard.

SEE ALSO

       feclearexcept(3M), fegetexceptflag(3M), feraiseexcept(3M), fesetexceptflag(3M), fesettrapenable(3M), fenv(5).

															       fegettrapenable(3M)