tdump.c - plan9port - [fork] Plan 9 from user space
  HTML git clone git://src.adamsgaard.dk/plan9port
   DIR Log
   DIR Files
   DIR Refs
   DIR README
   DIR LICENSE
       ---
       tdump.c (1340B)
       ---
            1 /*
            2  * Clumsy hack to take snapshots and dumps.
            3  */
            4 #include <u.h>
            5 #include <libc.h>
            6 
            7 void
            8 usage(void)
            9 {
           10         fprint(2, "usage: fossil/dump [-i snap-interval] [-n name] fscons /n/fossil\n");
           11         exits("usage");
           12 }
           13 
           14 char*
           15 snapnow(void)
           16 {
           17         Tm t;
           18         static char buf[100];
           19 
           20         t = *localtime(time(0)-5*60*60);        /* take dumps at 5:00 am */
           21 
           22         sprint(buf, "archive/%d/%02d%02d", t.year+1900, t.mon+1, t.mday);
           23         return buf;
           24 }
           25 
           26 void
           27 main(int argc, char **argv)
           28 {
           29         int onlyarchive, cons, s;
           30         ulong t, i;
           31         char *name;
           32 
           33         name = "main";
           34         s = 0;
           35         onlyarchive = 0;
           36         i = 60*60;                /* one hour */
           37         ARGBEGIN{
           38         case 'i':
           39                 i = atoi(EARGF(usage()));
           40                 if(i == 0){
           41                         onlyarchive = 1;
           42                         i = 60*60;
           43                 }
           44                 break;
           45         case 'n':
           46                 name = EARGF(usage());
           47                 break;
           48         case 's':
           49                 s = atoi(EARGF(usage()));
           50                 break;
           51         }ARGEND
           52 
           53         if(argc != 2)
           54                 usage();
           55 
           56         if((cons = open(argv[0], OWRITE)) < 0)
           57                 sysfatal("open %s: %r", argv[0]);
           58 
           59         if(chdir(argv[1]) < 0)
           60                 sysfatal("chdir %s: %r", argv[1]);
           61 
           62         rfork(RFNOTEG);
           63         switch(fork()){
           64         case -1:
           65                 sysfatal("fork: %r");
           66         case 0:
           67                 break;
           68         default:
           69                 exits(0);
           70         }
           71 
           72         /*
           73          * pause at boot time to let clock stabilize.
           74          */
           75         if(s)
           76                 sleep(s*1000);
           77 
           78         for(;;){
           79                 if(access(snapnow(), AEXIST) < 0)
           80                         fprint(cons, "\nfsys %s snap -a\n", name);
           81                 t = time(0);
           82                 sleep((i - t%i)*1000+200);
           83                 if(!onlyarchive)
           84                         fprint(cons, "\nfsys %s snap\n", name);
           85         }
           86 }