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Linux 0.12ÄÚºË

LinuxʹÓôÓ1970Äê1ÔÂ1ÈÕ0ʱ0·Ö0ÃëÆðµ½¿ª»úʱ¾­¹ýµÄÃëÊý×÷Ϊ¿ª»úʱ¼ä, ÊÇÔÚmain.cºÍmktime.cÖнøÐгõʼ»¯µÄ.
1. linux/init/main.c
/*
 * read current time from CMOS.
 * ·ÃÎÊCMOSÐèҪͨ¹ý¶Ë¿Ú0x70, 0x71½øÐÐ.
 * ¶ÁÊý¾Ýʱ,ÏÈÓÃOUTÖ¸ÁîÏò0x70·¢ËÍÒª¶ÁÈ¡×Ö½ÚµÄÆ«ÒÆÎ»ÖÃÖµ, È»ºóÓÃINÖ¸Áî´Ó0x71¶ÁÊý¾Ý.
 * Ð´Êý¾ÝʱҲһÑù, ÏÈÏò0x70·¢ËÍÆ«ÒÆÖµ, È»ºóÓÃOUTÖ¸ÁîÏò0x71¶Ë¿Ú·¢ËÍÊý¾Ý.
 */
#define CMOS_READ(addr) ({ \
             outb_p(0x80|addr,0x70); \
             inb_p(0x71); \
             })
/*
 * CMOS ×Ö½ÚÐÅÏ¢:
 * 0x00 - µ±Ç°Ãë. 0x02 - µ±Ç°·Ö. 0x04 - µ±Ç°Ð¡Ê±. 0x06 - Ò»ÖÜÖеĵ±Ç°Ìì.
 * 0x07 - Ò»ÔÂÖеĵ±Ç°ÈÕÆÚ. 0x08 - µ±Ç°Ô·Ý. 0x09 -  µ±Ç°Äê·Ý
 */
/* ½«È¡µÃµÄBCDÂëת»»ÎªÊýÖµ */
#define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)
/*
 * ³õʼ»¯¿ª»úʱ¼ä, ÓÉmain()µ÷ÓÃ.
 */
static void time_init(void)
{
     struct tm time;
     do {
           time.tm_sec = CMOS_READ(0);        /* ¶ÁÈ¡µ±Ç°ÃëÖµ */
           time.tm_min = CMOS_READ(2);        /* ¶ÁÈ¡µ±Ç°·ÖÖµ */
           time.tm_hour = CMOS_READ(4);
           time.tm_mday = CMOS_READ(7);
           time.tm_mon = CMOS_READ(8);       /* ¶ÁÈ¡µ±Ç°ÔÂ·Ý ( 1 - 12) */
           time.tm_year = CMOS_READ(9);
     } while (time.tm_sec != CMOS_READ(0));  /* Èç¹ûÃëÖµÒѾ­·¢Éú±ä»¯¾ÍÖØÐ¶ÁÒ»±é£¬
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# cd mysql-5.0.27
# ./configure -prefix=/home/redadmin/mysql
# make
# make install
# cd /home/redadmin/mysql/
# cp share/mysql/my-medium.cnf ./
# mv my-medium.cnf my.cnf
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TCP: Treason uncloaked! Peer 202.99.99.211:3760 ......

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