integrate Steve Hayman's version; now POSIX 1003.2 D11.2 compliant

[unix-history] / usr / src / usr.bin / systat / main.c

/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980 Regents of the University of California.\n\
All rights reserved.\n";
#endif not lint

#ifndef lint
static char sccsid[] = "@(#)main.c      5.10 (Berkeley) %G%";
#endif not lint

#include "systat.h"
#include <varargs.h>

static struct nlist nlst[] = {
#define X_FIRST         0
#define X_HZ            0
       { "_hz" },
#define X_PHZ           1
       { "_phz" },
       { "" }
};

int     naptime = 5;

void    die(), display(), suspend();

sig_t   sigtstpdfl;
int     dellave;

static  WINDOW *wload;                  /* one line window for load average */

int     verbose = 1;                    /* to report kvm read errs */

main(argc, argv)
       int argc;
       char **argv;
{

       argc--, argv++;
       while (argc > 0) {
               if (argv[0][0] == '-') {
                       struct cmdtab *p;

                       p = lookup(&argv[0][1]);
                       if (p == (struct cmdtab *)-1) {
                               fprintf(stderr, "%s: unknown request\n",
                                   &argv[0][1]);
                               exit(1);
                       }
                       curcmd = p;
               } else {
                       naptime = atoi(argv[0]);
                       if (naptime <= 0)
                               naptime = 5;
               }
               argc--, argv++;
       }
       kvm_nlist(nlst);
       if (nlst[X_FIRST].n_type == 0) {
               fprintf(stderr, "Couldn't namelist.\n");
               exit(1);
       }
       signal(SIGINT, die);
       signal(SIGQUIT, die);
       signal(SIGTERM, die);

       /*
        * Initialize display.  Load average appears in a one line
        * window of its own.  Current command's display appears in
        * an overlapping sub-window of stdscr configured by the display
        * routines to minimize update work by curses.
        */
       initscr();
       CMDLINE = LINES - 1;
       wnd = (*curcmd->c_open)();
       if (wnd == NULL) {
               fprintf(stderr, "Couldn't initialize display.\n");
               die();
       }
       wload = newwin(1, 0, 3, 20);
       if (wload == NULL) {
               fprintf(stderr, "Couldn't set up load average window.\n");
               die();
       }
       gethostname(hostname, sizeof (hostname));
       NREAD(X_HZ, &hz, LONG);
       NREAD(X_PHZ, &phz, LONG);
       (*curcmd->c_init)();
       curcmd->c_flags |= CF_INIT;
       labels();

       dellave = 0.0;

       signal(SIGALRM, display);
       sigtstpdfl = signal(SIGTSTP, suspend);
       display();
       noecho();
       crmode();
       keyboard();
       /*NOTREACHED*/
}

labels()
{
       if (curcmd->c_flags & CF_LOADAV) {
               mvaddstr(2, 20,
                   "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
               mvaddstr(3, 5, "Load Average");
       }
       (*curcmd->c_label)();
#ifdef notdef
       mvprintw(21, 25, "CPU usage on %s", hostname);
#endif
       refresh();
}

void
display()
{
       register int i, j;

       /* Get the load average over the last minute. */
       (void) getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
       (*curcmd->c_fetch)();
       if (curcmd->c_flags & CF_LOADAV) {
               j = 5.0*avenrun[0] + 0.5;
               dellave -= avenrun[0];
               if (dellave >= 0.0)
                       c = '<';
               else {
                       c = '>';
                       dellave = -dellave;
               }
               if (dellave < 0.1)
                       c = '|';
               dellave = avenrun[0];
               wmove(wload, 0, 0); wclrtoeol(wload);
               for (i = (j > 50) ? 50 : j; i > 0; i--)
                       waddch(wload, c);
               if (j > 50)
                       wprintw(wload, " %4.1f", avenrun[0]);
       }
       (*curcmd->c_refresh)();
       if (curcmd->c_flags & CF_LOADAV)
               wrefresh(wload);
       wrefresh(wnd);
       move(CMDLINE, col);
       refresh();
       alarm(naptime);
}

load()
{

       (void) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
       mvprintw(CMDLINE, 0, "%4.1f %4.1f %4.1f",
           avenrun[0], avenrun[1], avenrun[2]);
       clrtoeol();
}

void
die()
{
       move(CMDLINE, 0);
       clrtoeol();
       refresh();
       endwin();
       exit(0);
}

error(va_alist)
       va_dcl
{
       va_list ap;
       char *fmt, msg[200];

       va_start(ap);
       fmt = va_arg(ap, char *);
       (void) vsnprintf(msg, sizeof msg, fmt, ap);
       va_end(ap);
       mvaddstr(CMDLINE, 0, msg);
       clrtoeol();
       refresh();
}