feholdexcept(3p) [posix man page]

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 correspond-
       ing 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 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.1-2008 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.

       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(), feupdateenv()

       The Base Definitions volume of POSIX.1-2008, <fenv.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy  --	Portable  Operating  System  Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE
/The Open Group						       2013							  FEHOLDEXCEPT(3P)

FEGETENV(3P)						     POSIX Programmer's Manual						      FEGETENV(3P)

PROLOG

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

NAME

       fegetenv, fesetenv -- get and set current floating-point environment

SYNOPSIS

       #include <fenv.h>

       int fegetenv(fenv_t *envp);
       int fesetenv(const fenv_t *envp);

DESCRIPTION

       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.1-2008 defers to the ISO C standard.

       The fegetenv() function shall attempt to store the current floating-point environment in the object pointed to by envp.

       The  fesetenv() function shall attempt to establish the floating-point environment represented by the object pointed to by envp.  The argu-
       ment envp shall point to an object set by a call to fegetenv() or feholdexcept(), or equal a floating-point  environment  macro.  The  fes-
       etenv()	function  does	not  raise  floating-point  exceptions, but only installs the state of the floating-point status flags represented
       through its argument.

RETURN VALUE

       If the representation was successfully stored, fegetenv() shall return zero. Otherwise, it shall return a non-zero value.  If the  environ-
       ment was successfully established, fesetenv() shall return zero. Otherwise, it shall return a non-zero value.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       feholdexcept(), feupdateenv()

       The Base Definitions volume of POSIX.1-2008, <fenv.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C)  2013  by	the  Institute	of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE
/The Open Group						       2013							      FEGETENV(3P)