reorganize window management to allow display routines to set

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

#ifndef lint
static char sccsid[] = "@(#)main.c      1.4 (Lucasfilm) %G%";
#endif

#include "systat.h"

static struct nlist nlst[] = {
#define X_CCPU          0
       { "_ccpu" },
#define X_AVENRUN       1
       { "_avenrun" },
       { "" }
};

int     kmem = -1;
int     mem = -1;
int     swap = -1;
int     naptime = 5;

int     die();
int     display();
int     suspend();

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

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

                       for (p = cmdtab; *p->c_name; p++)
                               if (strcmp(p->c_name, &argv[0][1]) == 0)
                                       break;
                       if (*p->c_name == 0) {
                               fprintf(stderr, "%s: unknown request\n",
                                   &argv[0][1]);
                               exit(1);
                       }
                       curcmd = p;
               } else {
                       naptime = atoi(argv[1]);
                       if (naptime < 5)
                               naptime = 5;
               }
               argc--, argv++;
       }
       nlist("/vmunix", nlst);
       if (nlst[X_CCPU].n_type == 0) {
               fprintf(stderr, "Couldn't namelist /vmunix.\n");
               exit(1);
       }
       kmemf = "/dev/kmem";
       kmem = open(kmemf, O_RDONLY);
       if (kmem < 0) {
               perror(kmemf);
               exit(1);
       }
       memf = "/dev/mem";
       mem = open(memf, O_RDONLY);
       if (mem < 0) {
               perror(memf);
               exit(1);
       }
       swapf = "/dev/drum";
       swap = open(swapf, O_RDONLY);
       if (swap < 0) {
               perror(swapf);
               exit(1);
       }
       signal(SIGINT, die);
       signal(SIGQUIT, die);
       signal(SIGTERM, die);

       /*
        * Initialize display.  Load average appears in standard
        * window with current display's overlapping sub-window
        * maintained by the display routines to minimize update
        * work by curses.
        */
       initscr();
       wnd = (*curcmd->c_open)();
       if (wnd == NULL) {
               fprintf(stderr, "Couldn't initialize display.\n");
               die();
       }

#ifdef notdef
       gethostname(hostname, sizeof (hostname));
#endif
       lseek(kmem, nlst[X_CCPU].n_value, 0);
       read(kmem, &ccpu, sizeof (ccpu));
       lccpu = log(ccpu);
       (*curcmd->c_init)();
       curcmd->c_flags = 1;
       labels();

       known[0].k_uid = -1;
       strcpy(known[0].k_name, "<idle>");
       numknown = 1;
       dellave = 0.0;

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

labels()
{

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

display()
{
       register int i, j;

       /* Get the load average over the last minute. */
       lseek(kmem, nlst[X_AVENRUN].n_value, L_SET);
       read(kmem, &lave, sizeof (lave));
       (*curcmd->c_fetch)();
       j = 5.0*lave + 0.5;
       dellave -= lave;
       if (dellave >= 0.0)
               c = '<';
       else {
               c = '>';
               dellave = -dellave;
       }
       if (dellave < 0.1)
               c = '|';
       dellave = lave;
       wmove(wnd, 0, 15);
       wclrtoeol(wnd);
       for (i = (j > 50)? 50 : j; i > 0; i--)
               waddch(wnd, c);
       if (j > 50)
               wprintw(wnd, " %4.1f", lave);
       (*curcmd->c_refresh)();
       wrefresh(wnd);
       move(22, col);
       refresh();
       alarm(naptime);
}

load()
{

       lseek(kmem, nlst[X_AVENRUN].n_value, L_SET);
       read(kmem, &lave, sizeof (lave));
       mvprintw(22, 0, "%4.1f", lave);
       clrtoeol();
}

die()
{

       endwin();
       exit(0);
}

error(fmt, a1, a2, a3)
{

       mvprintw(22, 0, fmt, a1, a2, a3);
       clrtoeol();
       refresh();
}