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BRK

Section: Linux Programmer's Manual (2)
Updated: 1993-07-21
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brk, sbrk - ¥Ç¡¼¥¿¡¦¥»¥°¥á¥ó¥È¤Î¥µ¥¤¥º¤ÎÊѹ¹¤¹¤ë  

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#include <unistd.h>

int brk(void *end_data_segment);

void *sbrk(ptrdiff_t increment);  

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brk ¤Ï¡¢¥Ç¡¼¥¿¡¦¥»¥°¥á¥ó¥È(data segment)¤ÎºÇ¸å¤ò end_data_segment ¤Ç»ØÄꤷ¤¿ÃͤËÀßÄꤹ¤ë¡£ ¥·¥¹¥Æ¥à¤¬½½Ê¬¤Ê¥á¥â¥ê¤ò»ý¤Á¡¢ ¥×¥í¥»¥¹¤Î¥Ç¡¼¥¿¥µ¥¤¥º¤ÎºÇÂçÃͤòͤ¨¤Æ¤¤¤Ê¤ì¤Ð¤½¤ÎÃͤÏÍ­¸ú¤Ç¤¢¤ë¡£ (setrlimit(2) ¤ò»²¾È)¡£

sbrk ¤Ï¡¢¥×¥í¥°¥é¥à¤Î¥Ç¡¼¥¿¶õ´Ö¤ò increment ¥Ð¥¤¥È¤À¤±Áý¤ä¤¹¡£ sbrk ¤Ï¡¢¥·¥¹¥Æ¥à¡¦¥³¡¼¥ë¤Ç¤Ï¤Ê¤¯¡¢ C ¥é¥¤¥Ö¥é¥ê¤Ë¤¢¤ë¥é¥Ã¥Ñ¡¼ (wrapper) ¤Ç¤¢¤ë¡£ sbrk ¤Ï increment ¤ò 0 ¤Ë¤·¤Æ¤ò¸Æ¤Ó½Ð¤¹¤³¤È¤Ë¤è¤ê¡¢ ¥×¥í¥°¥é¥à¤Î¸½ºß¤Î¥Ö¥ì¡¼¥¯ (break) ¤òÃΤë¤Î¤¿¤á¤Ë»ÈÍѤǤ­¤ë¡£  

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À®¸ù¤·¤¿¾ì¹ç¡¢ brk ¤Ï 0 ¤òÊÖ¤·¡¢ sbrk ¤Ï¡¢¿·¤·¤¤Îΰè¤ÎÀèÆ¬¤Ø¤Î¥Ý¥¤¥ó¥¿¤òÊÖ¤¹¡£ ¥¨¥é¡¼¤Î¾ì¹ç¤Ë¤Ï¡¢ -1 ¤òÊÖ¤·¡¢ errno ¤Ë ENOMEM ¤òÀßÄꤹ¤ë¡£  

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BSD 4.3

brk ¤È sbrk ¤Ï C µ¬³Ê (C Standard) ¤Ë¤ÏÄêµÁ¤µ¤ì¤Æ¤¤¤Ê¤¤¡£ ¤Þ¤¿ POSIX.1 µ¬³Ê¤«¤é¤Ï°Õ¿ÞŪ¤Ë½ü³°¤µ¤ì¤Æ¤¤¤ë (ÃÊÍî B.1.1.1.3, B.8.3.3 »²¾È)¡£  

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execve(2), getrlimit(2), malloc(3)


 

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