MMAP

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#ifdef _POSIX_MAPPED_FILES

void * mmap(void *start, size_t length, int prot , int flags, int fd, off_t offset);

int munmap(void *start, size_t length);

#endif  

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PROT_EXEC

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PROT_READ

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PROT_WRITE

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PROT_NONE

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°ú¿ô flags ¤Ë¤Ï¡¢¥Þ¥Ã¥×¤µ¤ì¤¿¥ª¥Ö¥¸¥§¥¯¥È¤Î¥¿¥¤¥×¡¢¥Þ¥Ã¥×»þ¤Î¥ª¥×¥·¥ç¥ó¤È¤È¤â¤Ë¡¢ ¥Þ¥Ã¥×¤µ¤ì¤¿¥Ú¡¼¥¸¥³¥Ô¡¼¤Ø¤ÎÊѹ¹¤ò¹Ô¤¨¤ë¤Î¤¬¸Æ¤Ó½Ð¤·¥×¥í¥»¥¹¤À¤±¤Ê¤Î¤«¡¢ ¤½¤ì¤È¤â¤½¤Î¥Ú¡¼¥¸¤ò»²¾È¤¹¤ë¾¤Î¥×¥í¥»¥¹¤«¤é¤â²Äǽ¤Ê¤Î¤«¤ò»ØÄꤹ¤ë¡£ °Ê²¼¤Î¤è¤¦¤Ê¥Ó¥Ã¥È¥Ç¡¼¥¿¤¬Â¸ºß¤¹¤ë¡£

MAP_FIXED

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MAP_SHARED

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MAP_PRIVATE

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MAP_SHARED ¤È MAP_PRIVATE ¤Ï¡¢É¬¤º¤É¤Á¤é¤«¤Ò¤È¤Ä¤ò »ØÄꤷ¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£

°Ê¾å¤Î3¤Ä¤Î¥Õ¥é¥°¤Ï POSIX.1b (°ÊÁ°¤Î POSIX.4) ¤Çµ¬Äꤵ¤ì¤Æ¤¤¤ë¡£ Linux ¤Ë¤Ï¤³¤Î¾¤Ë MAP_DENYWRITE, MAP_EXECUTABLE, MAP_NORESERVE, MAP_LOCKED, MAP_GROWSDOWN and MAP_ANON(YMOUS) ¤¬¤¢¤ë¡£

offset ¤ÏÄ̾ï getpagesize(2) ¤ÎÊÖ¤¹¥Ú¡¼¥¸¥µ¥¤¥º¤ÎÀ°¿ôÇܤǤʤ±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£

¥·¥¹¥Æ¥à¥³¡¼¥ë munmap ¤Ï»ØÄꤵ¤ì¤¿¥¢¥É¥ì¥¹ÈϰϤΥޥåפò¾Ãµî¤·¡¢ °Ê¹ß¤Î¤½¤ÎÈÏ°ÏÆâ¤Ø¤Î»²¾È¤ò̵¸ú¤Ê¥á¥â¥ê»²¾È¤Ë¤¹¤ë¡£ ¤³¤ÎÎΰè¤Ï¡¢¥×¥í¥»¥¹¤¬½ªÎ»¤·¤¿¤È¤­¤Ë¤â¼«Æ°Åª¤Ë¥¢¥ó¥Þ¥Ã¥×¤µ¤ì¤ë¡£ °ìÊý¡¢¥Õ¥¡¥¤¥ëµ­½Ò»Ò¤ò¥¯¥í¡¼¥º¤·¤Æ¤â¡¢¤³¤ÎÎΰè¤Ï¥¢¥ó¥Þ¥Ã¥×¤µ¤ì¤Ê¤¤¡£

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EBADF

fd ¤¬Í­¸ú¤Ê¥Õ¥¡¥¤¥ëµ­½Ò»Ò (file descriptor) ¤Ç¤Ï¤Ê¤¤ (¤«¤Ä MAP_ANONYMOUS ¤¬¥»¥Ã¥È¤µ¤ì¤Æ¤¤¤Ê¤¤)¡£

EACCES

MAP_PRIVATE ¤òÍ׵ᤷ¤¿¤¬ fd ¤ÏÆɤ߹þ¤ßÍѤ˥ª¡¼¥×¥ó¤µ¤ì¤Æ¤¤¤Ê¤¤¡£ ¤Þ¤¿¤Ï MAP_SHARED ¤òÍ׵ᤷ¤Æ PROT_WRITE ¤ò¥»¥Ã¥È¤·¤¿¤¬¡¢ fd ¤ÏÆɤ߽ñ¤­¥â¡¼¥É (O_RDWR) ¤Ç¥ª¡¼¥×¥ó¤µ¤ì¤Æ¤¤¤Ê¤¤¡£

EINVAL

start ¤« length ¤« offset ¤¬¼õ¤±ÉÕ¤±¤é¤ì¤Ê¤¤¡£ (¤Ä¤Þ¤êÂ礭¤¹¤®¤ë¤«¡¢ PAGESIZE ¶­³¦¤Ë¥¢¥é¥¤¥ó¥á¥ó¥È¤µ¤ì¤Æ¤¤¤Ê¤¤)

ETXTBSY

MAP_DENYWRITE ¤¬¥»¥Ã¥È¤µ¤ì¤Æ¤¤¤ë¤¬ fd ¤Ç»ØÄꤵ¤ì¤Æ¤¤¤ë¥ª¥Ö¥¸¥§¥¯¥È¤Ï½ñ¤­¹þ¤ßÍѤ˳«¤«¤ì¤Æ¤¤¤ë¡£

EAGAIN

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ENOMEM

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SIGSEGV

Æɤ߹þ¤ßÀìÍÑ¤Ç mmap ¤µ¤ì¤¿Îΰè¤Ø½ñ¤­¹þ¤ß¤ò¹Ô¤ª¤¦¤È¤·¤¿¡£

SIGBUS

¥Ð¥Ã¥Õ¥¡¤Î¤¦¤Á¡¢¥Õ¥¡¥¤¥ë¤Ë´ØÏ¢¤Å¤±¤é¤ì¤Æ¤¤¤Ê¤¤Éôʬ¤Ë¥¢¥¯¥»¥¹¤ò¹Ô¤ª¤¦¤È¤·¤¿ (Î㤨¤Ð¥Õ¥¡¥¤¥ëËöÈø¤ò±Û¤¨¤¿Éôʬ¤Ê¤É¡£ ¾¤Î¥×¥í¥»¥¹¤¬¥Õ¥¡¥¤¥ë¤òÀÚ¤êµÍ¤á¤¿¾ì¹ç¤Ê¤É¤â¹Í¤¨¤é¤ì¤ë)¡£

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