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

/*
* Copyright (c) 1987 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/

#ifndef lint
static char sccsid[] = "@(#)update.c    4.3 (Berkeley) %G%";
#endif

/*
* Update the file system every 30 seconds.
* For cache benefit, open certain system directories.
*/

#include <sys/time.h>
#include <sys/file.h>
#include <sys/signal.h>
#include <syslog.h>
#include <stdio.h>

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

main()
{
       struct itimerval        value;
       register char   **f;
       extern int      sync();

       if (fork())
               exit(0);
       (void)close(0);
       (void)close(1);
       (void)close(2);
       for (f = fillst; *f; f++)
               (void)open(*f, O_RDONLY, 0);
       (void)signal(SIGALRM, sync);
       value.it_interval.tv_sec = 30;
       value.it_interval.tv_usec = 0;
       value.it_value = value.it_interval;
       if (setitimer(ITIMER_REAL, &value, (struct itimerval *)NULL)) {
               perror("update: setitimer");
               exit(1);
       }
       for (;;)
               pause();
       /*NOTREACHED*/
}