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 34 #include <sys/cdefs.h> 35 36 __FBSDID("$FreeBSD$"); 37 38 #ifdef lint 39 static const char sccsid[] = "@(#)main.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 42 #ifndef lint 43 static const char copyright[] = 44 "@(#) Copyright (c) 1980, 1992, 1993\n\ 45 The Regents of the University of California. All rights reserved.\n"; 46 #endif 47 48 #include <sys/param.h> 49 #include <sys/time.h> 50 #include <sys/sysctl.h> 51 52 #include <err.h> 53 #include <limits.h> 54 #include <locale.h> 55 #include <nlist.h> 56 #include <paths.h> 57 #include <signal.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <unistd.h> 61 62 #include "systat.h" 63 #include "extern.h" 64 65 static int dellave; 66 67 kvm_t *kd; 68 sig_t sigtstpdfl; 69 double avenrun[3]; 70 int col; 71 int naptime = 5; 72 int verbose = 1; /* to report kvm read errs */ 73 struct clockinfo clkinfo; 74 double hertz; 75 char c; 76 char *namp; 77 char hostname[MAXHOSTNAMELEN]; 78 WINDOW *wnd; 79 int CMDLINE; 80 int use_kvm = 1; 81 82 static WINDOW *wload; /* one line window for load average */ 83 84 int 85 main(int argc, char **argv) 86 { 87 char errbuf[_POSIX2_LINE_MAX], dummy; 88 size_t size; 89 90 (void) setlocale(LC_ALL, ""); 91 92 argc--, argv++; 93 while (argc > 0) { 94 if (argv[0][0] == '-') { 95 struct cmdtab *p; 96 97 p = lookup(&argv[0][1]); 98 if (p == (struct cmdtab *)-1) 99 errx(1, "%s: ambiguous request", &argv[0][1]); 100 if (p == (struct cmdtab *)0) 101 errx(1, "%s: unknown request", &argv[0][1]); 102 curcmd = p; 103 } else { 104 naptime = atoi(argv[0]); 105 if (naptime <= 0) 106 naptime = 5; 107 } 108 argc--, argv++; 109 } 110 kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf); 111 if (kd != NULL) { 112 /* 113 * Try to actually read something, we may be in a jail, and 114 * have /dev/null opened as /dev/mem. 115 */ 116 if (kvm_nlist(kd, namelist) != 0 || namelist[0].n_value == 0 || 117 kvm_read(kd, namelist[0].n_value, &dummy, sizeof(dummy)) != 118 sizeof(dummy)) { 119 kvm_close(kd); 120 kd = NULL; 121 } 122 } 123 if (kd == NULL) { 124 /* 125 * Maybe we are lacking permissions? Retry, this time with bogus 126 * devices. We can now use sysctl only. 127 */ 128 use_kvm = 0; 129 kd = kvm_openfiles("/dev/null", "/dev/null", "/dev/null", 130 O_RDONLY, errbuf); 131 if (kd == NULL) { 132 error("%s", errbuf); 133 exit(1); 134 } 135 } 136 signal(SIGHUP, die); 137 signal(SIGINT, die); 138 signal(SIGQUIT, die); 139 signal(SIGTERM, die); 140 141 /* 142 * Initialize display. Load average appears in a one line 143 * window of its own. Current command's display appears in 144 * an overlapping sub-window of stdscr configured by the display 145 * routines to minimize update work by curses. 146 */ 147 initscr(); 148 CMDLINE = LINES - 1; 149 wnd = (*curcmd->c_open)(); 150 if (wnd == NULL) { 151 warnx("couldn't initialize display"); 152 die(0); 153 } 154 wload = newwin(1, 0, 1, 20); 155 if (wload == NULL) { 156 warnx("couldn't set up load average window"); 157 die(0); 158 } 159 gethostname(hostname, sizeof (hostname)); 160 size = sizeof(clkinfo); 161 if (sysctlbyname("kern.clockrate", &clkinfo, &size, NULL, 0) 162 || size != sizeof(clkinfo)) { 163 error("kern.clockrate"); 164 die(0); 165 } 166 hertz = clkinfo.stathz; 167 (*curcmd->c_init)(); 168 curcmd->c_flags |= CF_INIT; 169 labels(); 170 171 dellave = 0.0; 172 173 signal(SIGALRM, display); 174 display(0); 175 noecho(); 176 crmode(); 177 keyboard(); 178 /*NOTREACHED*/ 179 180 return EXIT_SUCCESS; 181 } 182 183 void 184 labels(void) 185 { 186 if (curcmd->c_flags & CF_LOADAV) { 187 mvaddstr(0, 20, 188 "/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10"); 189 mvaddstr(1, 5, "Load Average"); 190 } 191 (*curcmd->c_label)(); 192 #ifdef notdef 193 mvprintw(21, 25, "CPU usage on %s", hostname); 194 #endif 195 refresh(); 196 } 197 198 void 199 display(int signo __unused) 200 { 201 int i, j; 202 203 /* Get the load average over the last minute. */ 204 (void) getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])); 205 (*curcmd->c_fetch)(); 206 if (curcmd->c_flags & CF_LOADAV) { 207 j = 5.0*avenrun[0] + 0.5; 208 dellave -= avenrun[0]; 209 if (dellave >= 0.0) 210 c = '<'; 211 else { 212 c = '>'; 213 dellave = -dellave; 214 } 215 if (dellave < 0.1) 216 c = '|'; 217 dellave = avenrun[0]; 218 wmove(wload, 0, 0); wclrtoeol(wload); 219 for (i = (j > 50) ? 50 : j; i > 0; i--) 220 waddch(wload, c); 221 if (j > 50) 222 wprintw(wload, " %4.1f", avenrun[0]); 223 } 224 (*curcmd->c_refresh)(); 225 if (curcmd->c_flags & CF_LOADAV) 226 wrefresh(wload); 227 wrefresh(wnd); 228 move(CMDLINE, col); 229 refresh(); 230 alarm(naptime); 231 } 232 233 void 234 load(void) 235 { 236 237 (void) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])); 238 mvprintw(CMDLINE, 0, "%4.1f %4.1f %4.1f", 239 avenrun[0], avenrun[1], avenrun[2]); 240 clrtoeol(); 241 } 242 243 void 244 die(int signo __unused) 245 { 246 move(CMDLINE, 0); 247 clrtoeol(); 248 refresh(); 249 endwin(); 250 exit(0); 251 } 252 253 #include <stdarg.h> 254 255 void 256 error(const char *fmt, ...) 257 { 258 va_list ap; 259 char buf[255]; 260 int oy, ox; 261 262 va_start(ap, fmt); 263 if (wnd) { 264 getyx(stdscr, oy, ox); 265 (void) vsnprintf(buf, sizeof(buf), fmt, ap); 266 clrtoeol(); 267 standout(); 268 mvaddstr(CMDLINE, 0, buf); 269 standend(); 270 move(oy, ox); 271 refresh(); 272 } else { 273 (void) vfprintf(stderr, fmt, ap); 274 fprintf(stderr, "\n"); 275 } 276 va_end(ap); 277 } 278 279 void 280 nlisterr(struct nlist n_list[]) 281 { 282 int i, n; 283 284 n = 0; 285 clear(); 286 mvprintw(2, 10, "systat: nlist: can't find following symbols:"); 287 for (i = 0; 288 n_list[i].n_name != NULL && *n_list[i].n_name != '\0'; i++) 289 if (n_list[i].n_value == 0) 290 mvprintw(2 + ++n, 10, "%s", n_list[i].n_name); 291 move(CMDLINE, 0); 292 clrtoeol(); 293 refresh(); 294 endwin(); 295 exit(1); 296 } 297