개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

feupdateenv(3m)

feupdateenv(3M)         Mathematical Library Functions         feupdateenv(3M)

NAME
       feupdateenv - update floating-point environment

SYNOPSIS
       c99 [ flag... ] file... -lm [ library... ]
       #include <fenv.h>

       int feupdateenv(const fenv_t *envp);

DESCRIPTION
       The feupdateenv() function attempts to save the currently raised float‐
       ing-point  exceptions in its automatic storage, attempts to install the
       floating-point environment represented by  the  object  pointed  to  by
       envp,  and  then attempts to raise the saved floating-point exceptions.
       The envp argument points to an object set by a call to fegetenv(3M)  or
       feholdexcept(3M), or equals a floating-point environment macro.

RETURN VALUES
       The  feupdateenv()  function  returns 0 if and only if all the required
       actions were successfully carried out.

ERRORS
       No errors are defined.

EXAMPLES
       The following example demonstrates sample code to hide spurious  under‐
       flow floating-point exceptions:

       Example 1 Hide spurious underflow floating-point exceptions.


         #include <fenv.h>
         double f(double x)
         {
         #   pragma STDC FENV_ACCESS ON
             double result;
             fenv_t save_env;
             feholdexcept(&save_env);
             // compute result
             if (/* test spurious underflow */)
             feclearexcept(FE_UNDERFLOW);
             feupdateenv(&save_env);
             return result;
         }



ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i)


       ATTRIBUTE  TYPEATTRIBUTE  VALUE _ Interface StabilityCommitted _ Avail‐
       abilitysystem/library/math  _  MT-LevelMT-Safe  _   StandardSee   stan‐
       dards(7).


SEE ALSO
       fenv.h(3HEAD),  fegetenv(3M),  feholdexcept(3M),  attributes(7),  stan‐
       dards(7)

NOTES
       In a multithreaded program,  the  feupdateenv()  function  affects  the
       floating point environment only for the calling thread.


       When  the FEX_CUSTOM handling mode is in effect for an exception, rais‐
       ing that exception using feupdateenv() causes the handling function  to
       be  invoked.  The handling function can then modify the exception flags
       to be set as described in fex_set_handling(3M). Any  result  value  the
       handler supplies will be ignored.


       The feupdateenv() function automatically installs and deinstalls SIGFPE
       handlers  and sets and clears the trap enable mode bits in the floating
       point status register as needed. If a program uses these functions  and
       attempts  to  install  a SIGFPE handler or control the trap enable mode
       bits independently, the resulting behavior is not defined.


       As described in fex_set_handling(3M),  when  a  handling  function  in‐
       stalled in FEX_CUSTOM mode is invoked, all exception traps are disabled
       (and  will  not be reenabled while SIGFPE is blocked). Thus, attempting
       to change the environment from within a handler by calling fesetenv(3M)
       or feupdateenv() might not produce the expected results.

Solaris 11.4                     27 Sept 2016                  feupdateenv(3M)