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 * 4. 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 30 #include <sys/cdefs.h> 31 32 __FBSDID("$FreeBSD$"); 33 34 #ifdef lint 35 static const char sccsid[] = "@(#)main.c 8.1 (Berkeley) 6/6/93"; 36 #endif 37 38 #ifndef lint 39 static const char copyright[] = 40 "@(#) Copyright (c) 1980, 1992, 1993\n\ 41 The Regents of the University of California. All rights reserved.\n"; 42 #endif 43 44 #include <sys/param.h> 45 #include <sys/time.h> 46 #include <sys/sysctl.h> 47 48 #include <err.h> 49 #include <limits.h> 50 #include <locale.h> 51 #include <nlist.h> 52 #include <paths.h> 53 #include <signal.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <unistd.h> 57 58 #include "systat.h" 59 #include "extern.h" 60 61 static int dellave; 62 63 kvm_t *kd; 64 sig_t sigtstpdfl; 65 double avenrun[3]; 66 int col; 67 int naptime = 5; 68 int verbose = 1; /* to report kvm read errs */ 69 struct clockinfo clkinfo; 70 double hertz; 71 char c; 72 char *namp; 73 char hostname[MAXHOSTNAMELEN]; 74 WINDOW *wnd; 75 int CMDLINE; 76 int use_kvm = 1; 77 78 static WINDOW *wload; /* one line window for load average */ 79 80 int 81 main(int argc, char **argv) 82 { 83 char errbuf[_POSIX2_LINE_MAX], dummy; 84 size_t size; 85 86 (void) setlocale(LC_ALL, ""); 87 88 argc--, argv++; 89 while (argc > 0) { 90 if (argv[0][0] == '-') { 91 struct cmdtab *p; 92 93 p = lookup(&argv[0][1]); 94 if (p == (struct cmdtab *)-1) 95 errx(1, "%s: ambiguous request", &argv[0][1]); 96 if (p == (struct cmdtab *)0) 97 errx(1, "%s: unknown request", &argv[0][1]); 98 curcmd = p; 99 } else { 100 naptime = atoi(argv[0]); 101 if (naptime <= 0) 102 naptime = 5; 103 } 104 argc--, argv++; 105 } 106 kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf); 107 if (kd != NULL) { 108 /* 109 * Try to actually read something, we may be in a jail, and 110 * have /dev/null opened as /dev/mem. 111 */ 112 if (kvm_nlist(kd, namelist) != 0 || namelist[0].n_value == 0 || 113 kvm_read(kd, namelist[0].n_value, &dummy, sizeof(dummy)) != 114 sizeof(dummy)) { 115 kvm_close(kd); 116 kd = NULL; 117 } 118 } 119 if (kd == NULL) { 120 /* 121 * Maybe we are lacking permissions? Retry, this time with bogus 122 * devices. We can now use sysctl only. 123 */ 124 use_kvm = 0; 125 kd = kvm_openfiles("/dev/null", "/dev/null", "/dev/null", 126 O_RDONLY, errbuf); 127 if (kd == NULL) { 128 error("%s", errbuf); 129 exit(1); 130 } 131 } 132 signal(SIGHUP, die); 133 signal(SIGINT, die); 134 signal(SIGQUIT, die); 135 signal(SIGTERM, die); 136 137 /* 138 * Initialize display. Load average appears in a one line 139 * window of its own. Current command's display appears in 140 * an overlapping sub-window of stdscr configured by the display 141 * routines to minimize update work by curses. 142 */ 143 initscr(); 144 CMDLINE = LINES - 1; 145 wnd = (*curcmd->c_open)(); 146 if (wnd == NULL) { 147 warnx("couldn't initialize display"); 148 die(0); 149 } 150 wload = newwin(1, 0, 1, 20); 151 if (wload == NULL) { 152 warnx("couldn't set up load average window"); 153 die(0); 154 } 155 gethostname(hostname, sizeof (hostname)); 156 size = sizeof(clkinfo); 157 if (sysctlbyname("kern.clockrate", &clkinfo, &size, NULL, 0) 158 || size != sizeof(clkinfo)) { 159 error("kern.clockrate"); 160 die(0); 161 } 162 hertz = clkinfo.stathz; 163 (*curcmd->c_init)(); 164 curcmd->c_flags |= CF_INIT; 165 labels(); 166 167 dellave = 0.0; 168 169 signal(SIGALRM, display); 170 display(0); 171 noecho(); 172 crmode(); 173 keyboard(); 174 /*NOTREACHED*/ 175 176 return EXIT_SUCCESS; 177 } 178 179 void 180 labels(void) 181 { 182 if (curcmd->c_flags & CF_LOADAV) { 183 mvaddstr(0, 20, 184 "/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10"); 185 mvaddstr(1, 5, "Load Average"); 186 } 187 (*curcmd->c_label)(); 188 #ifdef notdef 189 mvprintw(21, 25, "CPU usage on %s", hostname); 190 #endif 191 refresh(); 192 } 193 194 void 195 display(int signo __unused) 196 { 197 int i, j; 198 199 /* Get the load average over the last minute. */ 200 (void) getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])); 201 (*curcmd->c_fetch)(); 202 if (curcmd->c_flags & CF_LOADAV) { 203 j = 5.0*avenrun[0] + 0.5; 204 dellave -= avenrun[0]; 205 if (dellave >= 0.0) 206 c = '<'; 207 else { 208 c = '>'; 209 dellave = -dellave; 210 } 211 if (dellave < 0.1) 212 c = '|'; 213 dellave = avenrun[0]; 214 wmove(wload, 0, 0); wclrtoeol(wload); 215 for (i = (j > 50) ? 50 : j; i > 0; i--) 216 waddch(wload, c); 217 if (j > 50) 218 wprintw(wload, " %4.1f", avenrun[0]); 219 } 220 (*curcmd->c_refresh)(); 221 if (curcmd->c_flags & CF_LOADAV) 222 wrefresh(wload); 223 wrefresh(wnd); 224 move(CMDLINE, col); 225 refresh(); 226 alarm(naptime); 227 } 228 229 void 230 load(void) 231 { 232 233 (void) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])); 234 mvprintw(CMDLINE, 0, "%4.1f %4.1f %4.1f", 235 avenrun[0], avenrun[1], avenrun[2]); 236 clrtoeol(); 237 } 238 239 void 240 die(int signo __unused) 241 { 242 move(CMDLINE, 0); 243 clrtoeol(); 244 refresh(); 245 endwin(); 246 exit(0); 247 } 248 249 #include <stdarg.h> 250 251 void 252 error(const char *fmt, ...) 253 { 254 va_list ap; 255 char buf[255]; 256 int oy, ox; 257 258 va_start(ap, fmt); 259 if (wnd) { 260 getyx(stdscr, oy, ox); 261 (void) vsnprintf(buf, sizeof(buf), fmt, ap); 262 clrtoeol(); 263 standout(); 264 mvaddstr(CMDLINE, 0, buf); 265 standend(); 266 move(oy, ox); 267 refresh(); 268 } else { 269 (void) vfprintf(stderr, fmt, ap); 270 fprintf(stderr, "\n"); 271 } 272 va_end(ap); 273 } 274 275 void 276 nlisterr(struct nlist n_list[]) 277 { 278 int i, n; 279 280 n = 0; 281 clear(); 282 mvprintw(2, 10, "systat: nlist: can't find following symbols:"); 283 for (i = 0; 284 n_list[i].n_name != NULL && *n_list[i].n_name != '\0'; i++) 285 if (n_list[i].n_value == 0) 286 mvprintw(2 + ++n, 10, "%s", n_list[i].n_name); 287 move(CMDLINE, 0); 288 clrtoeol(); 289 refresh(); 290 endwin(); 291 exit(1); 292 } 293