settime.c

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    1 #include <u.h>
    2 #include <libc.h>
    3 #include <auth.h>
    4 #include <fcall.h>
    5 #include "../boot/boot.h"
    6 
    7 static long lusertime(char*);
    8 
    9 char *timeserver = "#s/boot";
   10 
   11 void
   12 settime(int islocal, int afd, char *rp)
   13 {
   14         int n, f;
   15         int timeset;
   16         Dir dir[2];
   17         char timebuf[64];
   18 
   19         print("time...");
   20         timeset = 0;
   21         if(islocal){
   22                 /*
   23                  *  set the time from the real time clock
   24                  */
   25                 f = open("#r/rtc", ORDWR);
   26                 if(f >= 0){
   27                         if((n = read(f, timebuf, sizeof(timebuf)-1)) > 0){
   28                                 timebuf[n] = '\0';
   29                                 timeset = 1;
   30                         }
   31                         close(f);
   32                 }else do{
   33                         strcpy(timebuf, "yymmddhhmm[ss]");
   34                         outin("\ndate/time ", timebuf, sizeof(timebuf));
   35                 }while((timeset=lusertime(timebuf)) <= 0);
   36         }
   37         if(timeset == 0){
   38                 /*
   39                  *  set the time from the access time of the root
   40                  */
   41                 f = open(timeserver, ORDWR);
   42                 if(f < 0)
   43                         return;
   44                 if(mount(f, afd, "/tmp", MREPL, rp) < 0){
   45                         warning("settime mount");
   46                         close(f);
   47                         return;
   48                 }
   49                 close(f);
   50                 if(stat("/tmp", statbuf, sizeof statbuf) < 0)
   51                         fatal("stat");
   52                 convM2D(statbuf, sizeof statbuf, &dir[0], (char*)&dir[1]);
   53                 sprint(timebuf, "%ld", dir[0].atime);
   54                 unmount(0, "/tmp");
   55         }
   56 
   57         f = open("#c/time", OWRITE);
   58         if(write(f, timebuf, strlen(timebuf)) < 0)
   59                 warning("can't set #c/time");
   60         close(f);
   61         print("\n");
   62 }
   63 
   64 #define SEC2MIN 60L
   65 #define SEC2HOUR (60L*SEC2MIN)
   66 #define SEC2DAY (24L*SEC2HOUR)
   67 
   68 int
   69 g2(char **pp)
   70 {
   71         int v;
   72 
   73         v = 10*((*pp)[0]-'') + (*pp)[1]-'';
   74         *pp += 2;
   75         return v;
   76 }
   77 
   78 /*
   79  *  days per month plus days/year
   80  */
   81 static  int     dmsize[] =
   82 {
   83         365, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
   84 };
   85 static  int     ldmsize[] =
   86 {
   87         366, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
   88 };
   89 
   90 /*
   91  *  return the days/month for the given year
   92  */
   93 static int *
   94 yrsize(int y)
   95 {
   96 
   97         if((y%4) == 0 && ((y%100) != 0 || (y%400) == 0))
   98                 return ldmsize;
   99         else
  100                 return dmsize;
  101 }
  102 
  103 /*
  104  *  compute seconds since Jan 1 1970
  105  */
  106 static long
  107 lusertime(char *argbuf)
  108 {
  109         char *buf;
  110         ulong secs;
  111         int i, y, m;
  112         int *d2m;
  113 
  114         buf = argbuf;
  115         i = strlen(buf);
  116         if(i != 10 && i != 12)
  117                 return -1;
  118         secs = 0;
  119         y = g2(&buf);
  120         m = g2(&buf);
  121         if(y < 70)
  122                 y += 2000;
  123         else
  124                 y += 1900;
  125 
  126         /*
  127          *  seconds per year
  128          */
  129         for(i = 1970; i < y; i++){
  130                 d2m = yrsize(i);
  131                 secs += d2m[0] * SEC2DAY;
  132         }
  133 
  134         /*
  135          *  seconds per month
  136          */
  137         d2m = yrsize(y);
  138         for(i = 1; i < m; i++)
  139                 secs += d2m[i] * SEC2DAY;
  140 
  141         secs += (g2(&buf)-1) * SEC2DAY;
  142         secs += g2(&buf) * SEC2HOUR;
  143         secs += g2(&buf) * SEC2MIN;
  144         if(*buf)
  145                 secs += g2(&buf);
  146 
  147         sprint(argbuf, "%ld", secs);
  148         return secs;
  149 }

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FreeBSD/Linux Kernel Cross Reference sys/boot/settime.c

FreeBSD/Linux Kernel Cross Reference
sys/boot/settime.c