usr.bin/systat/main.c

   1 /*-
   2  * Copyright (c) 1980, 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1980, 1992, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)main.c   8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.bin/systat/main.c,v 1.11.2.1 2001/06/06 20:26:01 tmm Exp $
  32  */
  33
  34 #include <sys/user.h>
  35 #include <sys/param.h>
  36 #include <sys/time.h>
  37
  38 #include <err.h>
  39 #include <limits.h>
  40 #include <locale.h>
  41 #include <nlist.h>
  42 #include <signal.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <unistd.h>
  46 #include "systat.h"
  47 #include "extern.h"
  48
  49 static struct nlist namelist[] = {
  50 #define X_FIRST         0
  51 #define X_HZ            0
  52         { .n_name = "_hz" },
  53 #define X_STATHZ                1
  54         { .n_name = "_stathz" },
  55         { .n_name = "" }
  56 };
  57 static int     dellave;
  58
  59 kvm_t *kd;
  60 sig_t   sigtstpdfl;
  61 double avenrun[3];
  62 int     col;
  63 double  naptime = 5.0;
  64 int     verbose = 1;                    /* to report kvm read errs */
  65 int     hz, stathz;
  66 double  hertz;
  67 char    c;
  68 char    *namp;
  69 char    hostname[MAXHOSTNAMELEN];
  70 WINDOW  *wnd;
  71 int     CMDLINE;
  72
  73 static  WINDOW *wload;                  /* one line window for load average */
  74
  75 int
  76 main(int argc, char **argv)
  77 {
  78         char errbuf[_POSIX2_LINE_MAX];
  79
  80         (void) setlocale(LC_TIME, "");
  81
  82         argc--, argv++;
  83         while (argc > 0) {
  84                 if (argv[0][0] == '-') {
  85                         struct cmdtab *p;
  86
  87                         p = lookup(&argv[0][1]);
  88                         if (p == (struct cmdtab *)-1)
  89                                 errx(1, "%s: ambiguous request", &argv[0][1]);
  90                         if (p == NULL)
  91                                 errx(1, "%s: unknown request", &argv[0][1]);
  92                         curcmd = p;
  93                 } else {
  94                         naptime = strtod(argv[0], NULL);
  95                         if (naptime <= 0.0)
  96                                 naptime = 5.0;
  97                 }
  98                 argc--, argv++;
  99         }
 100         kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf);
 101         if (kd == NULL) {
 102                 error("%s", errbuf);
 103                 exit(1);
 104         }
 105         signal(SIGINT, die);
 106         signal(SIGQUIT, die);
 107         signal(SIGTERM, die);
 108
 109         /*
 110          * Initialize display.  Load average appears in a one line
 111          * window of its own.  Current command's display appears in
 112          * an overlapping sub-window of stdscr configured by the display
 113          * routines to minimize update work by curses.
 114          */
 115         initscr();
 116         CMDLINE = LINES - 1;
 117         wnd = (*curcmd->c_open)();
 118         if (wnd == NULL) {
 119                 warnx("couldn't initialize display");
 120                 die(0);
 121         }
 122         wload = newwin(1, 0, 3, 20);
 123         if (wload == NULL) {
 124                 warnx("couldn't set up load average window");
 125                 die(0);
 126         }
 127         if (kvm_nlist(kd, namelist)) {
 128                 nlisterr(namelist);
 129                 exit(1);
 130         }
 131         if (namelist[X_FIRST].n_type == 0)
 132                 errx(1, "couldn't read namelist");
 133         gethostname(hostname, sizeof (hostname));
 134         NREAD(X_HZ, &hz, sizeof(hz));
 135         NREAD(X_STATHZ, &stathz, sizeof(stathz));
 136         hertz = stathz ? stathz : hz;
 137         (*curcmd->c_init)();
 138         curcmd->c_flags |= CF_INIT;
 139         labels();
 140
 141         dellave = 0.0;
 142
 143         signal(SIGALRM, display);
 144         display(0);
 145         noecho();
 146         crmode();
 147         keyboard();
 148         /*NOTREACHED*/
 149
 150         return EXIT_SUCCESS;
 151 }
 152
 153 void
 154 labels(void)
 155 {
 156         if (curcmd->c_flags & CF_LOADAV) {
 157                 mvaddstr(2, 20,
 158                     "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
 159                 mvaddstr(3, 5, "Load Average");
 160         }
 161         (*curcmd->c_label)();
 162 #ifdef notdef
 163         mvprintw(21, 25, "CPU usage on %s", hostname);
 164 #endif
 165         refresh();
 166 }
 167
 168 void
 169 display(int signo __unused)
 170 {
 171         int i, j;
 172         struct itimerval ctv;
 173
 174         /* Get the load average over the last minute. */
 175         (void) getloadavg(avenrun, NELEM(avenrun));
 176         (*curcmd->c_fetch)();
 177         if (curcmd->c_flags & CF_LOADAV) {
 178                 j = 5.0*avenrun[0] + 0.5;
 179                 dellave = avenrun[0];
 180                 c = '|';
 181                 wmove(wload, 0, 0); wclrtoeol(wload);
 182                 for (i = (j > 50) ? 50 : j; i > 0; i--)
 183                         waddch(wload, c);
 184                 if (j > 50)
 185                         wprintw(wload, " %4.1f", avenrun[0]);
 186         }
 187         (*curcmd->c_refresh)();
 188         if (curcmd->c_flags & CF_LOADAV)
 189                 wrefresh(wload);
 190         wrefresh(wnd);
 191         move(CMDLINE, col);
 192         refresh();
 193         ctv.it_interval.tv_sec = 0;
 194         ctv.it_interval.tv_usec = 0;
 195         ctv.it_value.tv_sec = (int)naptime;
 196         ctv.it_value.tv_usec = (naptime - (double)(int)naptime) * 1000000.0;
 197         setitimer(ITIMER_REAL, &ctv, NULL);
 198 }
 199
 200 void
 201 load(void)
 202 {
 203
 204         (void) getloadavg(avenrun, NELEM(avenrun));
 205         mvprintw(CMDLINE, 0, "%4.1f %4.1f %4.1f",
 206             avenrun[0], avenrun[1], avenrun[2]);
 207         clrtoeol();
 208 }
 209
 210 void
 211 die(int signo __unused)
 212 {
 213         move(CMDLINE, 0);
 214         clrtoeol();
 215         refresh();
 216         endwin();
 217         exit(0);
 218 }
 219
 220 #include <stdarg.h>
 221
 222 void
 223 error(const char *fmt, ...)
 224 {
 225         va_list ap;
 226         char buf[255];
 227         int oy, ox;
 228         va_start(ap, fmt);
 229
 230         if (wnd) {
 231                 getyx(stdscr, oy, ox);
 232                 (void) vsnprintf(buf, sizeof(buf), fmt, ap);
 233                 clrtoeol();
 234                 standout();
 235                 mvaddstr(CMDLINE, 0, buf);
 236                 standend();
 237                 move(oy, ox);
 238                 refresh();
 239         } else {
 240                 (void) vfprintf(stderr, fmt, ap);
 241                 fprintf(stderr, "\n");
 242         }
 243         va_end(ap);
 244 }
 245
 246 void
 247 nlisterr(struct nlist *n_list)
 248 {
 249         int i, n;
 250
 251         n = 0;
 252         clear();
 253         mvprintw(2, 10, "systat: nlist: can't find following symbols:");
 254         for (i = 0;
 255             n_list[i].n_name != NULL && *n_list[i].n_name != '\0'; i++)
 256                 if (n_list[i].n_value == 0)
 257                         mvprintw(2 + ++n, 10, "%s", n_list[i].n_name);
 258         move(CMDLINE, 0);
 259         clrtoeol();
 260         refresh();
 261         endwin();
 262         exit(1);
 263 }