FEHOLDEXCEPT(3P) POSIX Programmer s Manual FEHOLDEXCEPT(3P)

PROLOG This manual page is part of the POSIX Programmer s Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME feholdexcept - save current floating-point environment

SYNOPSIS #include <fenv.h>

int feholdexcept(fenv_t *envp);

DESCRIPTION The feholdexcept() function shall save the current floating-point envi- ronment in the object pointed to by envp, clear the floating-point sta- tus 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.

The following sections are informative.

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(), fesetenv(), feupdateenv(), the Base Definitions volume of IEEE Std 1003.1-2001, <fenv.h>

COPYRIGHT Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group 2003 FEHOLDEXCEPT(3P)