NAME

feholdexcept — save current floating-point environment

SYNOPSIS

#include <fenv.h>

int feholdexcept(fenv_t *envp);


DESCRIPTION

^[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2024 defers to the ISO C standard.

The feholdexcept() function shall save the current floating-point environment in the object pointed to by envp, clear the floating-point status flags, and then install a non-stop (continue on floating-point exceptions) mode, if available, for all floating-point exceptions.

RETURN VALUE

The feholdexcept() function shall return zero if and only if non-stop floating-point exception handling was successfully installed.

ERRORS

No errors are defined.

EXAMPLES

None.

APPLICATION USAGE

None.

RATIONALE

The feholdexcept() function should be effective on typical IEC 60559:1989 standard implementations which have the default non-stop mode and at least one other mode for trap handling or aborting. If the implementation provides only the non-stop mode, then installing the non-stop mode is trivial.

FUTURE DIRECTIONS

None.

SEE ALSO

fegetenv, feupdateenv

XBD <fenv.h>

CHANGE HISTORY

First released in Issue 6. Derived from the ISO/IEC 9899:1999 standard.