BSD 4 release

[unix-history] / usr / src / cmd / update.c

static char *sccsid = "@(#)update.c     4.2 (Berkeley) 10/15/80";
/*
* Update the file system every 30 seconds.
* For cache benefit, open certain system directories.
*/

#include <signal.h>

char *fillst[] = {
       "/bin",
       "/lib",
       "/usr",
       "/usr/bin",
       "/usr/lib",
       "/usr/ucb",
       0,
};

main()
{
       char **f;

       if(fork())
               exit(0);
       close(0);
       close(1);
       close(2);
       for(f = fillst; *f; f++)
               open(*f, 0);
       dosync();
       for(;;)
               pause();
}

dosync()
{
       sync();
       signal(SIGALRM, dosync);
       alarm(30);
}