6.3.3.1 Establishing an Exception Handler Function

To establish a function as an exception handler, pass the name of the function to ieee_handler(), together with the name of the exception to watch for and the action to take. Once you establish a handler, a SIGFPE signal is generated whenever the particular floating-point exception occurs, and the specified function is called.

The form for invoking ieee_handler() is shown in the following table:

Table 6–4 Arguments for ieee_handler( action , exception , handler)

Argument	Type	Possible Values
action	character	get, set, or clear
exception	character	invalid, division, overflow, underflow, or inexact
handler	Function name	The name of the user handler function or SIGFPE_DEFAULT, SIGFPE_IGNORE, or SIGFPE_ABORT
Return value	integer	0 =OK

A Fortran 95 routine compiled with f95 that calls ieee_handler() should also declare:

#include ’floatingpoint.h’

The special arguments SIGFPE_DEFAULT, SIGFPE_IGNORE, and SIGFPE_ABORT are defined in these include files and can be used to change the behavior of the program for a specific exception:

SIGFPE_DEFAULT or SIGFPE_IGNORE	No action taken when the specified exception occurs.
SIGFPE_ABORT	Program aborts, possibly with dump file, on exception.