FENV

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#include <fenv.h>

void feclearexcept(int excepts);


void fegetexceptflag(fexcept_t *flagp, int excepts);


void feraiseexcept(int excepts);


void fesetexceptflag(const fexcept_t *flagp, int excepts);


int fetestexcept(int excepts);

int fegetround(void);


int fesetround(int rounding_mode);

void fegetenv(fenv_t *envp);


int feholdexcept(fenv_t *envp);


void fesetenv(const fenv_t *envp);


void feupdateenv(const fenv_t *envp);

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feclearexcept ´Ø¿ô¤Ï¡¢°ú¿ô¤ÇÍ¿¤¨¤é¤ì¤¿¥Ó¥Ã¥È¤¬¼¨¤¹Îã³°¤Î¤¦¤Á¡¢ ¼ÂÁõ¤¬¥µ¥Ý¡¼¥È¤·¤Æ¤¤¤ë¤â¤Î¤ò¥¯¥ê¥¢¤¹¤ë¡£

fegetexceptflag ´Ø¿ô¤Ï¡¢°ú¿ô excepts ¤¬¼¨¤¹Îã³°¥Õ¥é¥°¤Î¾õÂÖ¤Îɽ¸½¤ò *flagp ¤¬»Ø¤¹ÈóÆ©²áŪ¤Ê¥ª¥Ö¥¸¥§¥¯¥È¤ËÊݸ¤¹¤ë¡£

feraiseexcept ´Ø¿ô¤Ï¡¢ excepts ¤Î¥Ó¥Ã¥È¤¬¼¨¤¹Îã³°¤Î¤¦¤Á¡¢ ¼ÂÁõ¤¬¥µ¥Ý¡¼¥È¤·¤Æ¤¤¤ë¤â¤Î¤òȯÀ¸¤µ¤»¤ë¡£

fesetexceptflag ´Ø¿ô¤Ï¡¢ *flagp ¤¬»Ø¤¹Ãͤò¡¢ excepts ¤¬É½¸½¤¹¤ë¡¢Îã³°¤Î´°Á´¤Ê¾õÂÖ¤ËÀßÄꤹ¤ë¡£ ¤³¤Î excepts ¤ÎÃͤϡ¢ ¤³¤ì°ÊÁ°¤Ë fegetexceptflag ´Ø¿ô¤ò (ºÇ¸å¤Î°ú¿ô¤Ë excepts ¤ÎÁ´¤Æ¤Î¥Ó¥Ã¥È¤ò´Þ¤à¤â¤Î¤òÍ¿¤¨¤Æ) ¸Æ¤Ó½Ð¤·¡¢ ¼èÆÀ¤µ¤ì¤¿Ãͤˤ¹¤Ù¤­¤Ç¤¢¤ë¡£

fetestexcept ´Ø¿ô¤Ï word ¤òÊÖ¤¹¡£ ¤³¤Î word ¤Ç¤Ï¡¢ excepts °ú¿ô¤Ç¥»¥Ã¥È¤µ¤ì¤Æ¤¤¤ë¥Ó¥Ã¥È¤Î¤¦¤Á¡¢ ¤½¤ì¤ËÂбþ¤¹¤ëÎã³°¤¬¸½ºßÀßÄꤵ¤ì¤Æ¤¤¤ë¤â¤Î¤¬Î©¤Æ¤é¤ì¤ë¡£  

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fegetround ´Ø¿ô¤Ï¸½ºß¤Î´Ý¤á¥â¡¼¥É¤ËÂбþ¤¹¤ë¥Þ¥¯¥í¤òÊÖ¤¹¡£

fesetround ´Ø¿ô¤Ï´Ý¤á¥â¡¼¥É¤ò°ú¿ô¤ËÍ¿¤¨¤é¤ì¤¿Ãͤˤ·¡¢ À®¸ù¤·¤¿¤é¥¼¥í¤òÊÖ¤¹¡£  

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fegetenv ´Ø¿ô¤Ï¡¢¸½ºß¤ÎÉâÆ°¾®¿ôÅÀ´Ä¶­¤ò¡¢¥ª¥Ö¥¸¥§¥¯¥È *envp ¤ËÊݸ¤¹¤ë¡£

feholdexcept ´Ø¿ô¤âƱ¤¸Æ°ºî¤ò¹Ô¤¤¡¢¤µ¤é¤ËÁ´¤Æ¤ÎÎã³°¥Õ¥é¥°¤ò¥¯¥ê¥¢¤·¡¢ non-stop (Îã³°»þ¤Ë¤â¼Â¹Ô¤ò·Ñ³) ¥â¡¼¥É¤Ø¤ÎÀßÄ꤬²Äǽ¤Ê¤é¤Ð¤³¤ì¤ò¹Ô¤¦¡£ À®¸ù¤·¤¿¤é¥¼¥í¤òÊÖ¤¹¡£

fesetenv ´Ø¿ô¤Ï¡¢ÉâÆ°¾®¿ôÅÀ´Ä¶­¤ò¡¢¥ª¥Ö¥¸¥§¥¯¥È *envp ¤«¤é¼è¤ê½Ð¤·¤¿ÃͤËÌ᤹¡£ ¤³¤Î¥ª¥Ö¥¸¥§¥¯¥È¤Ï¡¢Í­¸ú¤Ç¤¢¤ë¤³¤È¤¬»öÁ°¤Ë¤ï¤«¤Ã¤Æ¤¤¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£ Î㤨¤Ð¡¢ fegetenv ¤ä feholdexcept ¤ò¸Æ¤Ó½Ð¤·¤¿·ë²Ì¤Ç¤¢¤ë¤È¤«¡¢ FE_DFL_ENV ¤ËÅù¤·¤¤¤È¤«¤Ç¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£ ¤³¤Î´Ø¿ô¤Î¸Æ½Ð¤·¤ÏÎã³°¤òȯÀ¸¤·¤Ê¤¤¡£

feupdateenv ´Ø¿ô¤Ï¡¢¥ª¥Ö¥¸¥§¥¯¥È *envp ¤¬É½¸½¤¹¤ëÉâÆ°¾®¿ôÅÀ´Ä¶­¤ò¥¤¥ó¥¹¥È¡¼¥ë¤¹¤ë¡£ ¤¿¤À¤·¸½ºßΩ¤Ã¤Æ¤¤¤ëÎã³°¤Ï¥¯¥ê¥¢¤µ¤ì¤Ê¤¤¡£ ¤³¤Î´Ø¿ô¤ò¸Æ¤ó¤À¸å¤ËΩ¤Ã¤Æ¤¤¤ëÎã³°¤Ï¡¢ ²áµî¤Î¥»¥Ã¥È¤È *envp ¤È¤Î´Ö¤Ç¥Ó¥Ã¥È¤´¤È¤Î OR ¤ò¼è¤Ã¤¿¤â¤Î¤Ë¤Ê¤ë¡£ ¾åµ­¤Î¤è¤¦¤Ë¡¢¥ª¥Ö¥¸¥§¥¯¥È *envp ¤Ï¡¢»öÁ°¤ËÍ­¸ú¤Ç¤¢¤ë¤³¤È¤¬¤ï¤«¤Ã¤Æ¤¤¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£  

GNU ¤Î¾ÜºÙ

int feenableexcept (int excepts);


int fedisableexcept (int excepts);


int fegetexcept (void);

feenebleexcept ´Ø¿ô¤È fedisableexcept ´Ø¿ô¤Ï excepts ¤Ë¤è¤Ã¤Æɽ¸½¤µ¤ì¤ë³ÆÎã³°¤Î¥È¥é¥Ã¥×¤òÍ­¸ú (̵¸ú) ¤Ë¤¹¤ë¡£ À®¸ù¤·¤¿¾ì¹ç¤ÏľÁ°¤ËÍ­¸ú¤Ë¤Ê¤Ã¤Æ¤¤¤¿Îã³°¤Î¥»¥Ã¥È¤òÊÖ¤¹¡£ ¼ºÇÔ¤·¤¿¾ì¹ç¤Ï -1 ¤òÊÖ¤¹¡£ fegetexcept ´Ø¿ô¤Ï¸½ºßÍ­¸ú¤Ë¤Ê¤Ã¤Æ¤¤¤ëÎã³°Á´¤Æ¤«¤é¤Ê¤ë¥»¥Ã¥È¤òÊÖ¤¹¡£  

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