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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1980, 1992, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)main.c   8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.bin/systat/main.c,v 1.11.2.1 2001/06/06 20:26:01 tmm Exp $
  36  * $DragonFly: src/usr.bin/systat/main.c,v 1.7 2008/11/10 04:59:45 swildner Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/time.h>
  41
  42 #include <err.h>
  43 #include <limits.h>
  44 #include <locale.h>
  45 #include <nlist.h>
  46 #include <signal.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <unistd.h>
  50 #include "systat.h"
  51 #include "extern.h"
  52
  53 static struct nlist namelist[] = {
  54 #define X_FIRST         0
  55 #define X_HZ            0
  56         { .n_name = "_hz" },
  57 #define X_STATHZ                1
  58         { .n_name = "_stathz" },
  59         { .n_name = "" }
  60 };
  61 static int     dellave;
  62
  63 kvm_t *kd;
  64 sig_t   sigtstpdfl;
  65 double avenrun[3];
  66 int     col;
  67 double  naptime = 5.0;
  68 int     verbose = 1;                    /* to report kvm read errs */
  69 int     hz, stathz;
  70 double  hertz;
  71 char    c;
  72 char    *namp;
  73 char    hostname[MAXHOSTNAMELEN];
  74 WINDOW  *wnd;
  75 int     CMDLINE;
  76
  77 static  WINDOW *wload;                  /* one line window for load average */
  78
  79 int
  80 main(int argc, char **argv)
  81 {
  82         char errbuf[_POSIX2_LINE_MAX];
  83
  84         (void) setlocale(LC_TIME, "");
  85
  86         argc--, argv++;
  87         while (argc > 0) {
  88                 if (argv[0][0] == '-') {
  89                         struct cmdtab *p;
  90
  91                         p = lookup(&argv[0][1]);
  92                         if (p == (struct cmdtab *)-1)
  93                                 errx(1, "%s: ambiguous request", &argv[0][1]);
  94                         if (p == (struct cmdtab *)0)
  95                                 errx(1, "%s: unknown request", &argv[0][1]);
  96                         curcmd = p;
  97                 } else {
  98                         naptime = strtod(argv[0], NULL);
  99                         if (naptime <= 0.0)
 100                                 naptime = 5.0;
 101                 }
 102                 argc--, argv++;
 103         }
 104         kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf);
 105         if (kd == NULL) {
 106                 error("%s", errbuf);
 107                 exit(1);
 108         }
 109         signal(SIGINT, die);
 110         signal(SIGQUIT, die);
 111         signal(SIGTERM, die);
 112
 113         /*
 114          * Initialize display.  Load average appears in a one line
 115          * window of its own.  Current command's display appears in
 116          * an overlapping sub-window of stdscr configured by the display
 117          * routines to minimize update work by curses.
 118          */
 119         initscr();
 120         CMDLINE = LINES - 1;
 121         wnd = (*curcmd->c_open)();
 122         if (wnd == NULL) {
 123                 warnx("couldn't initialize display");
 124                 die(0);
 125         }
 126         wload = newwin(1, 0, 3, 20);
 127         if (wload == NULL) {
 128                 warnx("couldn't set up load average window");
 129                 die(0);
 130         }
 131         if (kvm_nlist(kd, namelist)) {
 132                 nlisterr(namelist);
 133                 exit(1);
 134         }
 135         if (namelist[X_FIRST].n_type == 0)
 136                 errx(1, "couldn't read namelist");
 137         gethostname(hostname, sizeof (hostname));
 138         NREAD(X_HZ, &hz, sizeof(hz));
 139         NREAD(X_STATHZ, &stathz, sizeof(stathz));
 140         hertz = stathz ? stathz : hz;
 141         (*curcmd->c_init)();
 142         curcmd->c_flags |= CF_INIT;
 143         labels();
 144
 145         dellave = 0.0;
 146
 147         signal(SIGALRM, display);
 148         display(0);
 149         noecho();
 150         crmode();
 151         keyboard();
 152         /*NOTREACHED*/
 153
 154         return EXIT_SUCCESS;
 155 }
 156
 157 void
 158 labels(void)
 159 {
 160         if (curcmd->c_flags & CF_LOADAV) {
 161                 mvaddstr(2, 20,
 162                     "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
 163                 mvaddstr(3, 5, "Load Average");
 164         }
 165         (*curcmd->c_label)();
 166 #ifdef notdef
 167         mvprintw(21, 25, "CPU usage on %s", hostname);
 168 #endif
 169         refresh();
 170 }
 171
 172 void
 173 display(int signo __unused)
 174 {
 175         int i, j;
 176         struct itimerval ctv;
 177
 178         /* Get the load average over the last minute. */
 179         (void) getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
 180         (*curcmd->c_fetch)();
 181         if (curcmd->c_flags & CF_LOADAV) {
 182                 j = 5.0*avenrun[0] + 0.5;
 183                 dellave = avenrun[0];
 184                 c = '|';
 185                 wmove(wload, 0, 0); wclrtoeol(wload);
 186                 for (i = (j > 50) ? 50 : j; i > 0; i--)
 187                         waddch(wload, c);
 188                 if (j > 50)
 189                         wprintw(wload, " %4.1f", avenrun[0]);
 190         }
 191         (*curcmd->c_refresh)();
 192         if (curcmd->c_flags & CF_LOADAV)
 193                 wrefresh(wload);
 194         wrefresh(wnd);
 195         move(CMDLINE, col);
 196         refresh();
 197         ctv.it_interval.tv_sec = 0;
 198         ctv.it_interval.tv_usec = 0;
 199         ctv.it_value.tv_sec = (int)naptime;
 200         ctv.it_value.tv_usec = (naptime - (double)(int)naptime) * 1000000.0;
 201         setitimer(ITIMER_REAL, &ctv, NULL);
 202 }
 203
 204 void
 205 load(void)
 206 {
 207
 208         (void) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
 209         mvprintw(CMDLINE, 0, "%4.1f %4.1f %4.1f",
 210             avenrun[0], avenrun[1], avenrun[2]);
 211         clrtoeol();
 212 }
 213
 214 void
 215 die(int signo __unused)
 216 {
 217         move(CMDLINE, 0);
 218         clrtoeol();
 219         refresh();
 220         endwin();
 221         exit(0);
 222 }
 223
 224 #include <stdarg.h>
 225
 226 void
 227 error(const char *fmt, ...)
 228 {
 229         va_list ap;
 230         char buf[255];
 231         int oy, ox;
 232         va_start(ap, fmt);
 233
 234         if (wnd) {
 235                 getyx(stdscr, oy, ox);
 236                 (void) vsnprintf(buf, sizeof(buf), fmt, ap);
 237                 clrtoeol();
 238                 standout();
 239                 mvaddstr(CMDLINE, 0, buf);
 240                 standend();
 241                 move(oy, ox);
 242                 refresh();
 243         } else {
 244                 (void) vfprintf(stderr, fmt, ap);
 245                 fprintf(stderr, "\n");
 246         }
 247         va_end(ap);
 248 }
 249
 250 void
 251 nlisterr(struct nlist *n_list)
 252 {
 253         int i, n;
 254
 255         n = 0;
 256         clear();
 257         mvprintw(2, 10, "systat: nlist: can't find following symbols:");
 258         for (i = 0;
 259             n_list[i].n_name != NULL && *n_list[i].n_name != '\0'; i++)
 260                 if (n_list[i].n_value == 0)
 261                         mvprintw(2 + ++n, 10, "%s", n_list[i].n_name);
 262         move(CMDLINE, 0);
 263         clrtoeol();
 264         refresh();
 265         endwin();
 266         exit(1);
 267 }