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  * $DragonFly: src/usr.bin/systat/main.c,v 1.7 2008/11/10 04:59:45 swildner Exp $
  33  */
  34
  35 #include <sys/user.h>
  36 #include <sys/param.h>
  37 #include <sys/time.h>
  38
  39 #include <err.h>
  40 #include <limits.h>
  41 #include <locale.h>
  42 #include <nlist.h>
  43 #include <signal.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <unistd.h>
  47 #include "systat.h"
  48 #include "extern.h"
  49
  50 static struct nlist namelist[] = {
  51 #define X_FIRST         0
  52 #define X_HZ            0
  53         { .n_name = "_hz" },
  54 #define X_STATHZ                1
  55         { .n_name = "_stathz" },
  56         { .n_name = "" }
  57 };
  58 static int     dellave;
  59
  60 kvm_t *kd;
  61 sig_t   sigtstpdfl;
  62 double avenrun[3];
  63 int     col;
  64 double  naptime = 5.0;
  65 int     verbose = 1;                    /* to report kvm read errs */
  66 int     hz, stathz;
  67 double  hertz;
  68 char    c;
  69 char    *namp;
  70 char    hostname[MAXHOSTNAMELEN];
  71 WINDOW  *wnd;
  72 int     CMDLINE;
  73
  74 static  WINDOW *wload;                  /* one line window for load average */
  75
  76 int
  77 main(int argc, char **argv)
  78 {
  79         char errbuf[_POSIX2_LINE_MAX];
  80
  81         (void) setlocale(LC_TIME, "");
  82
  83         argc--, argv++;
  84         while (argc > 0) {
  85                 if (argv[0][0] == '-') {
  86                         struct cmdtab *p;
  87
  88                         p = lookup(&argv[0][1]);
  89                         if (p == (struct cmdtab *)-1)
  90                                 errx(1, "%s: ambiguous request", &argv[0][1]);
  91                         if (p == NULL)
  92                                 errx(1, "%s: unknown request", &argv[0][1]);
  93                         curcmd = p;
  94                 } else {
  95                         naptime = strtod(argv[0], NULL);
  96                         if (naptime <= 0.0)
  97                                 naptime = 5.0;
  98                 }
  99                 argc--, argv++;
 100         }
 101         kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf);
 102         if (kd == NULL) {
 103                 error("%s", errbuf);
 104                 exit(1);
 105         }
 106         signal(SIGINT, die);
 107         signal(SIGQUIT, die);
 108         signal(SIGTERM, die);
 109
 110         /*
 111          * Initialize display.  Load average appears in a one line
 112          * window of its own.  Current command's display appears in
 113          * an overlapping sub-window of stdscr configured by the display
 114          * routines to minimize update work by curses.
 115          */
 116         initscr();
 117         CMDLINE = LINES - 1;
 118         wnd = (*curcmd->c_open)();
 119         if (wnd == NULL) {
 120                 warnx("couldn't initialize display");
 121                 die(0);
 122         }
 123         wload = newwin(1, 0, 3, 20);
 124         if (wload == NULL) {
 125                 warnx("couldn't set up load average window");
 126                 die(0);
 127         }
 128         if (kvm_nlist(kd, namelist)) {
 129                 nlisterr(namelist);
 130                 exit(1);
 131         }
 132         if (namelist[X_FIRST].n_type == 0)
 133                 errx(1, "couldn't read namelist");
 134         gethostname(hostname, sizeof (hostname));
 135         NREAD(X_HZ, &hz, sizeof(hz));
 136         NREAD(X_STATHZ, &stathz, sizeof(stathz));
 137         hertz = stathz ? stathz : hz;
 138         (*curcmd->c_init)();
 139         curcmd->c_flags |= CF_INIT;
 140         labels();
 141
 142         dellave = 0.0;
 143
 144         signal(SIGALRM, display);
 145         display(0);
 146         noecho();
 147         crmode();
 148         keyboard();
 149         /*NOTREACHED*/
 150
 151         return EXIT_SUCCESS;
 152 }
 153
 154 void
 155 labels(void)
 156 {
 157         if (curcmd->c_flags & CF_LOADAV) {
 158                 mvaddstr(2, 20,
 159                     "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
 160                 mvaddstr(3, 5, "Load Average");
 161         }
 162         (*curcmd->c_label)();
 163 #ifdef notdef
 164         mvprintw(21, 25, "CPU usage on %s", hostname);
 165 #endif
 166         refresh();
 167 }
 168
 169 void
 170 display(int signo __unused)
 171 {
 172         int i, j;
 173         struct itimerval ctv;
 174
 175         /* Get the load average over the last minute. */
 176         (void) getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
 177         (*curcmd->c_fetch)();
 178         if (curcmd->c_flags & CF_LOADAV) {
 179                 j = 5.0*avenrun[0] + 0.5;
 180                 dellave = avenrun[0];
 181                 c = '|';
 182                 wmove(wload, 0, 0); wclrtoeol(wload);
 183                 for (i = (j > 50) ? 50 : j; i > 0; i--)
 184                         waddch(wload, c);
 185                 if (j > 50)
 186                         wprintw(wload, " %4.1f", avenrun[0]);
 187         }
 188         (*curcmd->c_refresh)();
 189         if (curcmd->c_flags & CF_LOADAV)
 190                 wrefresh(wload);
 191         wrefresh(wnd);
 192         move(CMDLINE, col);
 193         refresh();
 194         ctv.it_interval.tv_sec = 0;
 195         ctv.it_interval.tv_usec = 0;
 196         ctv.it_value.tv_sec = (int)naptime;
 197         ctv.it_value.tv_usec = (naptime - (double)(int)naptime) * 1000000.0;
 198         setitimer(ITIMER_REAL, &ctv, NULL);
 199 }
 200
 201 void
 202 load(void)
 203 {
 204
 205         (void) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
 206         mvprintw(CMDLINE, 0, "%4.1f %4.1f %4.1f",
 207             avenrun[0], avenrun[1], avenrun[2]);
 208         clrtoeol();
 209 }
 210
 211 void
 212 die(int signo __unused)
 213 {
 214         move(CMDLINE, 0);
 215         clrtoeol();
 216         refresh();
 217         endwin();
 218         exit(0);
 219 }
 220
 221 #include <stdarg.h>
 222
 223 void
 224 error(const char *fmt, ...)
 225 {
 226         va_list ap;
 227         char buf[255];
 228         int oy, ox;
 229         va_start(ap, fmt);
 230
 231         if (wnd) {
 232                 getyx(stdscr, oy, ox);
 233                 (void) vsnprintf(buf, sizeof(buf), fmt, ap);
 234                 clrtoeol();
 235                 standout();
 236                 mvaddstr(CMDLINE, 0, buf);
 237                 standend();
 238                 move(oy, ox);
 239                 refresh();
 240         } else {
 241                 (void) vfprintf(stderr, fmt, ap);
 242                 fprintf(stderr, "\n");
 243         }
 244         va_end(ap);
 245 }
 246
 247 void
 248 nlisterr(struct nlist *n_list)
 249 {
 250         int i, n;
 251
 252         n = 0;
 253         clear();
 254         mvprintw(2, 10, "systat: nlist: can't find following symbols:");
 255         for (i = 0;
 256             n_list[i].n_name != NULL && *n_list[i].n_name != '\0'; i++)
 257                 if (n_list[i].n_value == 0)
 258                         mvprintw(2 + ++n, 10, "%s", n_list[i].n_name);
 259         move(CMDLINE, 0);
 260         clrtoeol();
 261         refresh();
 262         endwin();
 263         exit(1);
 264 }