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 #include <sys/queue.h> 48 49 #include <err.h> 50 #include <limits.h> 51 #include <locale.h> 52 #include <nlist.h> 53 #include <paths.h> 54 #include <signal.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #include "systat.h" 61 #include "extern.h" 62 63 static int dellave; 64 65 kvm_t *kd; 66 sig_t sigtstpdfl; 67 double avenrun[3]; 68 int col; 69 unsigned int delay = 5000000; /* in microseconds */ 70 int verbose = 1; /* to report kvm read errs */ 71 struct clockinfo clkinfo; 72 double hertz; 73 char c; 74 char *namp; 75 char hostname[MAXHOSTNAMELEN]; 76 WINDOW *wnd; 77 int CMDLINE; 78 int use_kvm = 1; 79 80 static WINDOW *wload; /* one line window for load average */ 81 82 struct cmdentry { 83 SLIST_ENTRY(cmdentry) link; 84 char *cmd; /* Command name */ 85 char *argv; /* Arguments vector for a command */ 86 }; 87 SLIST_HEAD(, cmdentry) commands; 88 89 static void 90 parse_cmd_args (int argc, char **argv) 91 { 92 int in_command = 0; 93 struct cmdentry *cmd = NULL; 94 double t; 95 96 while (argc) { 97 if (argv[0][0] == '-') { 98 if (in_command) 99 SLIST_INSERT_HEAD(&commands, cmd, link); 100 101 if (memcmp(argv[0], "--", 3) == 0) { 102 in_command = 0; /*-- ends a command explicitly*/ 103 argc --, argv ++; 104 continue; 105 } 106 cmd = calloc(1, sizeof(struct cmdentry)); 107 if (cmd == NULL) 108 errx(1, "memory allocating failure"); 109 cmd->cmd = strdup(&argv[0][1]); 110 if (cmd->cmd == NULL) 111 errx(1, "memory allocating failure"); 112 in_command = 1; 113 } 114 else if (!in_command) { 115 t = strtod(argv[0], NULL) * 1000000.0; 116 if (t > 0 && t < (double)UINT_MAX) 117 delay = (unsigned int)t; 118 } 119 else if (cmd != NULL) { 120 cmd->argv = strdup(argv[0]); 121 if (cmd->argv == NULL) 122 errx(1, "memory allocating failure"); 123 in_command = 0; 124 SLIST_INSERT_HEAD(&commands, cmd, link); 125 } 126 else 127 errx(1, "invalid arguments list"); 128 129 argc--, argv++; 130 } 131 if (in_command && cmd != NULL) 132 SLIST_INSERT_HEAD(&commands, cmd, link); 133 134 } 135 136 int 137 main(int argc, char **argv) 138 { 139 char errbuf[_POSIX2_LINE_MAX], dummy; 140 size_t size; 141 struct cmdentry *cmd = NULL; 142 143 (void) setlocale(LC_ALL, ""); 144 145 SLIST_INIT(&commands); 146 argc--, argv++; 147 if (argc > 0) { 148 if (argv[0][0] == '-') { 149 struct cmdtab *p; 150 151 p = lookup(&argv[0][1]); 152 if (p == (struct cmdtab *)-1) 153 errx(1, "%s: ambiguous request", &argv[0][1]); 154 if (p == (struct cmdtab *)0) 155 errx(1, "%s: unknown request", &argv[0][1]); 156 curcmd = p; 157 argc--, argv++; 158 } 159 parse_cmd_args (argc, argv); 160 161 } 162 kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf); 163 if (kd != NULL) { 164 /* 165 * Try to actually read something, we may be in a jail, and 166 * have /dev/null opened as /dev/mem. 167 */ 168 if (kvm_nlist(kd, namelist) != 0 || namelist[0].n_value == 0 || 169 kvm_read(kd, namelist[0].n_value, &dummy, sizeof(dummy)) != 170 sizeof(dummy)) { 171 kvm_close(kd); 172 kd = NULL; 173 } 174 } 175 if (kd == NULL) { 176 /* 177 * Maybe we are lacking permissions? Retry, this time with bogus 178 * devices. We can now use sysctl only. 179 */ 180 use_kvm = 0; 181 kd = kvm_openfiles("/dev/null", "/dev/null", "/dev/null", 182 O_RDONLY, errbuf); 183 if (kd == NULL) { 184 error("%s", errbuf); 185 exit(1); 186 } 187 } 188 signal(SIGHUP, die); 189 signal(SIGINT, die); 190 signal(SIGQUIT, die); 191 signal(SIGTERM, die); 192 193 /* 194 * Initialize display. Load average appears in a one line 195 * window of its own. Current command's display appears in 196 * an overlapping sub-window of stdscr configured by the display 197 * routines to minimize update work by curses. 198 */ 199 initscr(); 200 CMDLINE = LINES - 1; 201 wnd = (*curcmd->c_open)(); 202 if (wnd == NULL) { 203 warnx("couldn't initialize display"); 204 die(0); 205 } 206 wload = newwin(1, 0, 1, 20); 207 if (wload == NULL) { 208 warnx("couldn't set up load average window"); 209 die(0); 210 } 211 gethostname(hostname, sizeof (hostname)); 212 size = sizeof(clkinfo); 213 if (sysctlbyname("kern.clockrate", &clkinfo, &size, NULL, 0) 214 || size != sizeof(clkinfo)) { 215 error("kern.clockrate"); 216 die(0); 217 } 218 hertz = clkinfo.stathz; 219 (*curcmd->c_init)(); 220 curcmd->c_flags |= CF_INIT; 221 labels(); 222 223 if (curcmd->c_cmd != NULL) 224 SLIST_FOREACH (cmd, &commands, link) 225 if (!curcmd->c_cmd(cmd->cmd, cmd->argv)) 226 warnx("command is not understood"); 227 228 dellave = 0.0; 229 display(); 230 noecho(); 231 crmode(); 232 keyboard(); 233 /*NOTREACHED*/ 234 235 return EXIT_SUCCESS; 236 } 237 238 void 239 labels(void) 240 { 241 if (curcmd->c_flags & CF_LOADAV) { 242 mvaddstr(0, 20, 243 "/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10"); 244 mvaddstr(1, 5, "Load Average"); 245 } 246 (*curcmd->c_label)(); 247 #ifdef notdef 248 mvprintw(21, 25, "CPU usage on %s", hostname); 249 #endif 250 refresh(); 251 } 252 253 void 254 display(void) 255 { 256 int i, j; 257 258 /* Get the load average over the last minute. */ 259 (void) getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])); 260 (*curcmd->c_fetch)(); 261 if (curcmd->c_flags & CF_LOADAV) { 262 j = 5.0*avenrun[0] + 0.5; 263 dellave -= avenrun[0]; 264 if (dellave >= 0.0) 265 c = '<'; 266 else { 267 c = '>'; 268 dellave = -dellave; 269 } 270 if (dellave < 0.1) 271 c = '|'; 272 dellave = avenrun[0]; 273 wmove(wload, 0, 0); wclrtoeol(wload); 274 for (i = (j > 50) ? 50 : j; i > 0; i--) 275 waddch(wload, c); 276 if (j > 50) 277 wprintw(wload, " %4.1f", avenrun[0]); 278 } 279 (*curcmd->c_refresh)(); 280 if (curcmd->c_flags & CF_LOADAV) 281 wrefresh(wload); 282 wrefresh(wnd); 283 move(CMDLINE, col); 284 refresh(); 285 } 286 287 void 288 load(void) 289 { 290 291 (void) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])); 292 mvprintw(CMDLINE, 0, "%4.1f %4.1f %4.1f", 293 avenrun[0], avenrun[1], avenrun[2]); 294 clrtoeol(); 295 } 296 297 void 298 die(int signo __unused) 299 { 300 move(CMDLINE, 0); 301 clrtoeol(); 302 refresh(); 303 endwin(); 304 exit(0); 305 } 306 307 #include <stdarg.h> 308 309 void 310 error(const char *fmt, ...) 311 { 312 va_list ap; 313 char buf[255]; 314 int oy, ox; 315 316 va_start(ap, fmt); 317 if (wnd) { 318 getyx(stdscr, oy, ox); 319 (void) vsnprintf(buf, sizeof(buf), fmt, ap); 320 clrtoeol(); 321 standout(); 322 mvaddstr(CMDLINE, 0, buf); 323 standend(); 324 move(oy, ox); 325 refresh(); 326 } else { 327 (void) vfprintf(stderr, fmt, ap); 328 fprintf(stderr, "\n"); 329 } 330 va_end(ap); 331 } 332 333 void 334 nlisterr(struct nlist n_list[]) 335 { 336 int i, n; 337 338 n = 0; 339 clear(); 340 mvprintw(2, 10, "systat: nlist: can't find following symbols:"); 341 for (i = 0; 342 n_list[i].n_name != NULL && *n_list[i].n_name != '\0'; i++) 343 if (n_list[i].n_value == 0) 344 mvprintw(2 + ++n, 10, "%s", n_list[i].n_name); 345 move(CMDLINE, 0); 346 clrtoeol(); 347 refresh(); 348 endwin(); 349 exit(1); 350 } 351