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fesetenv(3p) [suse man page]

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 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 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 Technol-
       ogy -- 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							      FEGETENV(3P)

Check Out this Related Man Page

FEGETENV(3)						   BSD Library Functions Manual 					       FEGETENV(3)

NAME

     fegetenv, feholdexcept, fesetenv, feupdateenv -- functions providing access to the floating-point environment.

SYNOPSIS

     #include <fenv.h>
     #pragma STDC FENV_ACCESS ON

     int
     fegetenv(fenv_t *envp);

     int
     feholdexcept(fenvt_t *envp);

     int
     fesetenv(fenv_t *envp);

     int
     feupdateenv(fenv_t *envp);

DESCRIPTION

     These functions provide the means to manage the entire floating-point environment--including both status flags and control modes--as a single
     entity.

     The fegetenv() function attempts to store the current floating-point environment in the object pointed to by envp.  It returns zero if the
     environment was successfully stored, and a nonzero value otherwise.

     The feholdexcept() function saves the current floating-point environment in the object pointed to by envp, clears the floating-point status
     flags, and then installs a "non-stop" mode, if available, under which no traps are taken for floating-point exceptions (as is the case in
     default IEEE-754 floating-point execution).  It returns zero if and only if such a mode was successfully installed.

     The fesetenv() function attempts to establish the floating-point environment represented by the object pointed to by envp.  This object shall
     have been set by a call to fegetenv() or feholdexcept(), or be equal to a floating-point environment macro defined in <fenv.h>.  Note that
     this function merely installs the floating-point status flags represented by its argument, and does not raise the corresponding floating-
     point exceptions.	It returns zero if and only if the environment pointed to by envp was successfully installed.

     The feupdateenv() function attempts to save the currently raised floating-point flags, install the floating-point environment represented by
     *envp, and then raise the floating-point exceptions corresponding to the saved flags.  The object pointed to by envp shall have been set by a
     call to fegetenv() or feholdexcept(), or be equal to a floating-point environment macro defined in <fenv.h>.  It returns zero if and only if
     all of the specified actions were successfully carried out.

SEE ALSO

     fenv(3), feclearexcept(3), fegetexceptflag(3), fegetround(3), feraiseexcept(3), fesetexceptflag(3), fesetround(3), feraiseexcept(3)

STANDARDS

     These functions conform to ISO/IEC 9899:TC3.

BSD
								    May 9, 2011 							       BSD
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