lseek64

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Version: 2004-12-11 (openSuse - 09/10/07)

Section: 3 (Bibliothèques de fonctions)

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lseek64 - ¥Õ¥¡¥¤¥ë¤Î 64 ¥Ó¥Ã¥È¤ÎÆɤ߽ñ¤­¥ª¥Õ¥»¥Ã¥È¤Î°ÌÃÖ¤òÊѤ¨¤ë

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#define _LARGEFILE64_SOURCE
#include <sys/types.h>
#include <unistd.h>

off64_t lseek64(int fd, off64_t offset, int whence);

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lseek(2) ´Ø¿ô¥Õ¥¡¥ß¥ê¡¼¤Ï¡¢¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿ fd ¤Ë´ØÏ¢¤¹¤ë¥ª¡¼¥×¥ó¤µ¤ì¤¿¥Õ¥¡¥¤¥ë¤Î¥ª¥Õ¥»¥Ã¥È¤ò¡¢ ¥Õ¥¡¥¤¥ë¤Î³«»Ï°ÌÃÖ¡¦¸½ºß°ÌÃÖ¡¦½ªÃ¼¤«¤é offset ¤Î°ÌÃÖ¤ØÊѹ¹¤¹¤ë¡£ ¤³¤ì¤Ï whence ¤¬¤½¤ì¤¾¤ì SEEK_SET, SEEK_CUR, SEEK_END ¤Î¾ì¹ç¤ËÂбþ¤¹¤ë¡£

¹¹¤Ë¾Ü¤·¤¤ÀâÌÀ¡¦ÊÖ¤êÃÍ¡¦¥¨¥é¡¼¤Ï¡¢ lseek(2) ¤ò»²¾È¤¹¤ë¤³¤È¡£

4 ¤Ä¤Î¥¤¥ó¥¿¥Õ¥§¡¼¥¹¤¬»ÈÍѲÄǽ¤Ç¤¢¤ë: lseek(2), lseek64(), llseek(2) ¤È¸µ¤È¤Ê¤ë¥·¥¹¥Æ¥à¥³¡¼¥ë _llseek(2) ¤Ç¤¢¤ë¡£

lseek

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off_t lseek(int fd, off_t offset, int whence);

¥é¥¤¥Ö¥é¥ê¥ë¡¼¥Á¥ó lseek() ¤Ï·¿ off_t ¤ò»È¤¦¡£ ¤³¤ì¤Ï 32 ¥Ó¥Ã¥È¥¢¡¼¥­¥Æ¥¯¥Á¥ã¾å¤Ç¤Ï 32 ¥Ó¥Ã¥ÈÉä¹æÉÕ¤­·¿¤Ç¤¢¤ë¡£ ¤¿¤À¤·¡¢




#define _FILE_OFFSET_BITS 64
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lseek64

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off64_t lseek64(int fd, off64_t offset, int whence);

¥é¥¤¥Ö¥é¥ê¥ë¡¼¥Á¥ó lseek64() ¤Ï off_t ¤¬ 32 ¥Ó¥Ã¥È·¿¤Ç¤¢¤Ã¤Æ¤â 64 ¥Ó¥Ã¥È·¿¤ò»È¤¦¡£ ¤³¤Î¥×¥í¥È¥¿¥¤¥× (¤È·¿ off64_t) ¤Ï¡¢°Ê²¼¤ÎÄêµÁ¤ò¤·¤Æ¥³¥ó¥Ñ¥¤¥ë¤·¤¿¾ì¹ç¤Ë¤Î¤ß»ÈÍѲÄǽ¤Ç¤¢¤ë¡£




#define _LARGEFILE64_SOURCE
´Ø¿ô lseek64() ¤Ï glibc 2.1 °Ê¹ß¤Ç»ÈÍѲÄǽ¤Ç¤¢¤ê¡¢ llseek() ¤Î¥¨¥¤¥ê¥¢¥¹¤È¤·¤ÆÄêµÁ¤µ¤ì¤Æ¤¤¤ë¡£

llseek

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loff_t llseek(int fd, loff_t offset, int whence);

·¿ loff_t ¤Ï 64 ¥Ó¥Ã¥ÈÉä¹æÉÕ¤­·¿¤Ç¤¢¤ë¡£ ¥é¥¤¥Ö¥é¥ê¥ë¡¼¥Á¥ó llseek() ¤Ï libc5 ¤È glibc ¤Ç»ÈÍѲÄǽ¤Ç¤¢¤ê¡¢ÆÃÊ̤ÊÄêµÁ¤Ê¤·¤ËÆ°ºî¤¹¤ë¡£ ¤³¤Î¥×¥í¥È¥¿¥¤¥×¤Ï¡¢libc5 ¤Ç¤Ï <unistd.h> ¤ÇÍ¿¤¨¤é¤ì¤ë¤¬¡¢glibc ¤Ï¥×¥í¥È¥¿¥¤¥×¤òÄ󶡤·¤Ê¤¤¡£ ¤³¤ì¤Ï¥×¥í¥È¥¿¥¤¥×¤¬É¬Íפˤʤë¤Î¤ÇÎɤ¯¤Ê¤¤¡£ ¥æ¡¼¥¶¤Ï¾åµ­¤Î¥×¥í¥È¥¿¥¤¥×¤Þ¤¿¤Ï¤½¤ì¤ÈƱÅù¤Î¤â¤Î¤ò¡¢ ¼«¿È¤Î¥½¡¼¥¹¤ËÄɲ䷤ʤ±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£ ¤³¤Î¥Ç¡¼¥¿¤¬¤Ê¤¤¤³¤È¤Ë¤è¤Ã¤Æ e2fsck(8) ¤Î¥³¥ó¥Ñ¥¤¥ë¤¬¼ºÇÔ¤¹¤ë¤È¤¤¤¦¶ì¾ð¤¬¥æ¡¼¥¶¤«¤é½Ð¤¿¤Î¤Ç¡¢ glibc 2.1.3 ¤Ç¤Ï°Ê²¼¤Î¤è¤¦¤Ê¥ê¥ó¥¯»þ¤Î·Ù¹ð¤¬Äɲ䵤줿¡£

"the `llseek' function may be dangerous; use `lseek64' instead."

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_llseek

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int _llseek(int fd, off_t offset_hi, off_t offset_lo,

loff_t *result, int whence);

¹¹¤Ë¾Ü¤·¤¤¾ðÊó¤Ï¡¢ llseek(2) ¤ò»²¾È¤¹¤ë¤³¤È¡£

´ØÏ¢¹àÌÜ

llseek(2), lseek(2), feature_test_macros(7)