ruptime/ruptime.c

/*
 * Copyright (c) 1983 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)ruptime.c   5.5 (Berkeley) 8/25/88";
#endif /* not lint */

#include <sys/param.h>
#include <sys/dir.h>
#include <sys/file.h>
#include <protocols/rwhod.h>
#include <stdio.h>

#define NHOSTS  100
int     nhosts;
struct hs {
        struct  whod *hs_wd;
        int     hs_nusers;
} hs[NHOSTS];
struct  whod awhod;

#define WHDRSIZE        (sizeof (awhod) - sizeof (awhod.wd_we))
#define RWHODIR         "/usr/spool/rwho"
#define down(h)         (now - (h)->hs_wd->wd_recvtime > 11 * 60)

time_t  now;
int     rflg = 1;
int     hscmp(), ucmp(), lcmp(), tcmp();

main(argc, argv)
        int argc;
        char **argv;
{
        extern char *optarg;
        extern int optind;
        register struct hs *hsp = hs;
        register struct whod *wd;
        register struct whoent *we;
        register DIR *dirp;
        struct direct *dp;
        int aflg, cc, ch, f, i, maxloadav;
        char buf[sizeof(struct whod)];
        int (*cmp)() = hscmp;
        time_t time();
        char *interval(), *malloc();

        aflg = 0;
        maxloadav = -1;
        while ((ch = getopt(argc, argv, "alrut")) != EOF)
                switch((char)ch) {
                case 'a':
                        aflg = 1;
                        break;
                case 'l':
                        cmp = lcmp;
                        break;
                case 'r':
                        rflg = -1;
                        break;
                case 't':
                        cmp = tcmp;
                        break;
                case 'u':
                        cmp = ucmp;
                        break;
                default:
                        fprintf(stderr, "usage: ruptime [-alrut]\n");
                        exit(1);
                }

        if (chdir(RWHODIR) || (dirp = opendir(".")) == NULL) {
                perror(RWHODIR);
                exit(1);
        }
        while (dp = readdir(dirp)) {
                if (dp->d_ino == 0 || strncmp(dp->d_name, "whod.", 5))
                        continue;
                if (nhosts == NHOSTS) {
                        fprintf(stderr, "ruptime: too many hosts\n");
                        exit(1);
                }
                f = open(dp->d_name, O_RDONLY, 0);
                if (f > 0) {
                        cc = read(f, buf, sizeof(struct whod));
                        if (cc >= WHDRSIZE) {
                                /* NOSTRICT */
                                hsp->hs_wd = (struct whod *)malloc(WHDRSIZE);
                                wd = (struct whod *)buf;
                                bcopy(wd, hsp->hs_wd, WHDRSIZE);
                                hsp->hs_nusers = 0;
                                for (i = 0; i < 2; i++)
                                        if (wd->wd_loadav[i] > maxloadav)
                                                maxloadav = wd->wd_loadav[i];
                                we = (struct whoent *)(buf+cc);
                                while (--we >= wd->wd_we)
                                        if (aflg || we->we_idle < 3600)
                                                hsp->hs_nusers++;
                                nhosts++; hsp++;
                        }
                        (void)close(f);
                }
        }
        if (!nhosts) {
                printf("ruptime: no hosts!?!\n");
                exit(1);
        }
        qsort((char *)hs, nhosts, sizeof (hs[0]), cmp);
        (void)time(&now);
        for (i = 0; i < nhosts; i++) {
                hsp = &hs[i];
                if (down(hsp)) {
                        printf("%-12.12s%s\n", hsp->hs_wd->wd_hostname,
                            interval(now - hsp->hs_wd->wd_recvtime, "down"));
                        continue;
                }
                printf("%-12.12s%s,  %4d user%s  load %*.2f, %*.2f, %*.2f\n",
                    hsp->hs_wd->wd_hostname,
                    interval(hsp->hs_wd->wd_sendtime -
                        hsp->hs_wd->wd_boottime, "  up"),
                    hsp->hs_nusers,
                    hsp->hs_nusers == 1 ? ", " : "s,",
                    maxloadav >= 1000 ? 5 : 4,
                        hsp->hs_wd->wd_loadav[0] / 100.0,
                    maxloadav >= 1000 ? 5 : 4,
                        hsp->hs_wd->wd_loadav[1] / 100.0,
                    maxloadav >= 1000 ? 5 : 4,
                        hsp->hs_wd->wd_loadav[2] / 100.0);
                cfree(hsp->hs_wd);
        }
        exit(0);
}

char *
interval(tval, updown)
        time_t tval;
        char *updown;
{
        static char resbuf[32];
        int days, hours, minutes;

        if (tval < 0 || tval > 365*24*60*60) {
                (void)sprintf(resbuf, "   %s ??:??", updown);
                return(resbuf);
        }
        minutes = (tval + 59) / 60;             /* round to minutes */
        hours = minutes / 60; minutes %= 60;
        days = hours / 24; hours %= 24;
        if (days)
                (void)sprintf(resbuf, "%s %2d+%02d:%02d",
                    updown, days, hours, minutes);
        else
                (void)sprintf(resbuf, "%s    %2d:%02d",
                    updown, hours, minutes);
        return(resbuf);
}

hscmp(h1, h2)
        struct hs *h1, *h2;
{
        return(rflg * strcmp(h1->hs_wd->wd_hostname, h2->hs_wd->wd_hostname));
}

/*
 * Compare according to load average.
 */
lcmp(h1, h2)
        struct hs *h1, *h2;
{
        if (down(h1))
                if (down(h2))
                        return(tcmp(h1, h2));
                else
                        return(rflg);
        else if (down(h2))
                return(-rflg);
        else
                return(rflg *
                        (h2->hs_wd->wd_loadav[0] - h1->hs_wd->wd_loadav[0]));
}

/*
 * Compare according to number of users.
 */
ucmp(h1, h2)
        struct hs *h1, *h2;
{
        if (down(h1))
                if (down(h2))
                        return(tcmp(h1, h2));
                else
                        return(rflg);
        else if (down(h2))
                return(-rflg);
        else
                return(rflg * (h2->hs_nusers - h1->hs_nusers));
}

/*
 * Compare according to uptime.
 */
tcmp(h1, h2)
        struct hs *h1, *h2;
{
        return(rflg * (
                (down(h2) ? h2->hs_wd->wd_recvtime - now
                          : h2->hs_wd->wd_sendtime - h2->hs_wd->wd_boottime)
                -
                (down(h1) ? h1->hs_wd->wd_recvtime - now
                          : h1->hs_wd->wd_sendtime - h1->hs_wd->wd_boottime)
        ));
}