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    ÎÒ¼ÙÉèÄãÒѾ­ÖªµÀÁ˱ê×¼¼¶µÄÎļþ²Ù×÷µÄ¸÷¸öº¯Êý(fopen,fread,fwriteµÈµÈ).µ±È»Èç¹ûÄã²»Çå³þµÄ»°Ò²²»Òª×ż±.ÎÒÃÇÌÖÂÛµÄϵͳ¼¶µÄÎļþ²Ù×÷ʵ¼ÊÉÏÊÇΪ±ê×¼¼¶Îļþ²Ù×÷·þÎñµÄ. 
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int open(const char *pathname,int flags);
int open(const char *pathname,int flags,mode_t mode);
int close(int fd);
openº¯ÊýÓÐÁ½¸öÐÎʽ.ÆäÖÐpathnameÊÇÎÒÃÇÒª´ò¿ªµÄÎļþÃû(°üº¬Â·¾¶Ãû³Æ,ȱʡÊÇÈÏΪÔÚµ±Ç°Â·¾¶ÏÂÃæ).flags¿ÉÒÔÈ¥ÏÂÃæµÄÒ»¸öÖµ»òÕßÊǼ¸¸öÖµµÄ×éºÏ. 
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O_APPEND:ÒÔ×·¼ÓµÄ·½Ê½´ò¿ªÎļþ. 
O_CREAT:´´½¨Ò»¸öÎļþ. 
O_EXEC:Èç¹ûʹÓÃÁËO_CREAT¶øÇÒÎļþÒѾ­´æÔÚ,¾Í»á·¢ÉúÒ»¸ö´íÎó. 
O_NOBLOCK:ÒÔ·Ç×èÈûµÄ·½Ê½´ò¿ªÒ»¸öÎļþ. 
O_TRUNC:Èç¹ûÎļþÒѾ­´æÔÚ,Ôòɾ³ýÎļþµÄÄÚÈÝ. 
Ç°ÃæÈý¸ö±êÖ¾Ö»ÄÜʹÓÃÈÎÒâµÄÒ»¸ö.Èç¹ûʹÓÃÁËO_CREATE±êÖ¾,ÄÇôÎÒÃÇҪʹÓÃopenµÄµÚ¶þÖÖÐÎʽ.»¹ÒªÖ¸¶¨mode±êÖ¾,ÓÃÀ´±íʾÎļþµÄ·ÃÎÊȨÏÞ.mode¿ÉÒÔÊÇÒÔÏÂÇé¿öµÄ×éºÏ. 
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