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FORK

Section: Linux Programmer's Manual (2)
Updated: 1995-06-10
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fork - »Ò¥×¥í¥»¥¹¤òÀ¸À®¤¹¤ë  

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

pid_t fork(void);  

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fork ¤Ï¿Æ¥×¥í¥»¥¹¤È PID (¥×¥í¥»¥¹ ID)¡¢¤ª¤è¤Ó PPID (¿Æ¥×¥í¥»¥¹ ID) ¤À¤±¤¬ °Û¤Ê¤ë»Ò¥×¥í¥»¥¹¤òÀ¸À®¤¹¤ë¡£ ¤³¤Î»þ¡¢»ñ¸»ÍøÍÑÎÌ¤Ï 0 ¤ËÀßÄꤵ¤ì¤ë¡£ ¥Õ¥¡¥¤¥ë¥í¥Ã¥¯¤ÈÊÝα¤·¤Æ¤¤¤ë¥·¥°¥Ê¥ë¤Ï°ú¤­·Ñ¤¬¤ì¤Ê¤¤¡£

Linux ¤Ç¤Ï¡¢ fork ¤ò ½ñ¤­¹þ¤ß»þ¥³¥Ô¡¼ (copy-on-write)¡¦¥Ú¡¼¥¸¤òÍѤ¤¤Æ¼ÂÁõ¤·¤Æ¤¤¤ë¡£ ¤·¤¿¤¬¤Ã¤Æ¡¢fork ¤ò¹Ô¤¦¤³¤È¤ÎÍ£°ì¤Î¥Ç¥á¥ê¥Ã¥È¤Ï¡¢ ¿Æ¥×¥í¥»¥¹¤Î¥Ú¡¼¥¸¡¦¥Æ¡¼¥Ö¥ë¤òÊ£À½¤È »Ò¥×¥í¥»¥¹¼«¿È¤Î¥¿¥¹¥¯¹½Â¤¤ÎºîÀ®¤Î¤¿¤á¤Î»þ´Ö¤È¥á¥â¥ê¤¬É¬Íפʤ³¤È¤Ç¤¢¤ë¡£  

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À®¸ù¤·¤¿¾ì¹ç¡¢¿Æ¤Î¼Â¹Ô¥¹¥ì¥Ã¥É¤Ë¤Ï»Ò¥×¥í¥»¥¹¤Î PID ¤¬ÊÖ¤µ¤ì¡¢ »Ò¤Î¼Â¹Ô¥¹¥ì¥Ã¥É¤Ë¤Ï 0 ¤¬ÊÖ¤µ¤ì¤ë¡£ ¼ºÇÔ¤·¤¿¾ì¹ç¡¢¿Æ¥×¥í¥»¥¹¤Ë -1 ¤òÊÖ¤·¡¢»Ò¥×¥í¥»¥¹¤ÏÀ¸À®¤µ¤ì¤Ê¤¤¡£ ¤Þ¤¿¡¢ errno ¤¬Å¬ÀÚ¤ËÀßÄꤵ¤ì¤ë¡£  

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EAGAIN
¿Æ¥×¥í¥»¥¹¤Î¥Ú¡¼¥¸¡¦¥Æ¡¼¥Ö¥ë¤Î¥³¥Ô¡¼¤È »Ò¥×¥í¥»¥¹¤Î¥¿¥¹¥¯¹½Â¤¤ËÀ¸À®¤ËɬÍפʥá¥â¥ê¤ò fork ¤¬³ä¤êÅö¤Æ¤ë¤³¤È¤¬¤Ç¤­¤Ê¤«¤Ã¤¿¡£
ENOMEM
¥á¥â¥ê¤¬Â­¤ê¤Ê¤¤¤¿¤á¤Ë¡¢ fork ¤ÏɬÍפʥ«¡¼¥Í¥ë¹½Â¤ÂΤò³ä¤êÅö¤Æ¤ë¤³¤È¤¬¤Ç¤­¤Ê¤«¤Ã¤¿¡£
 

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fork ¤Ï SVr4, SVID, POSIX, X/OPEN, BSD 4.3 ¤Ë½àµò¤·¤Æ¤¤¤ë¡£  

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clone(2), execve(2), vfork(2), wait(2)


 

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