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NetBSD 6.1.5 - man page for feupdateenv (netbsd section 3)

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

NAME
     fegetenv, feholdexcept, fesetenv, feupdateenv -- floating-point environment save and restore

LIBRARY
     Math Library (libm, -lm)

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

     int
     fegetenv(fenv_t *envp);

     int
     feholdexcept(fenv_t *envp);

     int
     fesetenv(const fenv_t *envp);

     int
     feupdateenv(const fenv_t *envp);

DESCRIPTION
     The floating-point environment includes exception flags and masks, the current rounding
     mode, and other architecture-specific settings.  However, it does not include the floating-
     point register file.

     The fegetenv() function stores the current floating-point environment in the object pointed
     to by envp, whereas feholdexcept() saves the current environment, then clears all exception
     flags and masks all floating-point exceptions.

     The fesetenv() function restores a previously saved environment.  The feupdateenv() function
     restores a saved environment as well, but it also raises any exceptions that were set in the
     environment it replaces.

     The feholdexcept() function is often used with feupdateenv() or fesetenv() to suppress spu-
     rious exceptions that occur as a result of intermediate computations.  An example in fenv(3)
     demonstrates how to do this.

RETURN VALUES
     The fegetenv(), feholdexcept(), fesetenv(), and feupdateenv() functions return 0 if they
     succeed, and non-zero otherwise.

SEE ALSO
     feclearexcept(3), fenv(3), feraiseexcept(3), fesetenv(3), fetestexcept(3), fpgetmask(3),
     fpsetmask(3)

STANDARDS
     The fegetenv(), feholdexcept(), fesetenv(), and feupdateenv() functions conform to ISO/IEC
     9899:1999 (``ISO C99'').

HISTORY
     These routines first appeared in FreeBSD 5.3 and NetBSD 6.0.

BSD					   May 8, 2004					      BSD


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