main.c revision 1.54
1 /* $NetBSD: main.c,v 1.54 2018/12/26 01:47:37 sevan Exp $ */ 2 3 /*- 4 * Copyright (c) 1980, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1980, 1992, 1993\ 35 The Regents of the University of California. All rights reserved."); 36 #if 0 37 static char sccsid[] = "@(#)main.c 8.1 (Berkeley) 6/6/93"; 38 #endif 39 __RCSID("$NetBSD: main.c,v 1.54 2018/12/26 01:47:37 sevan Exp $"); 40 #endif /* not lint */ 41 42 #include <sys/param.h> 43 #include <sys/sysctl.h> 44 #include <sys/ioctl.h> 45 46 #include <ctype.h> 47 #include <err.h> 48 #include <errno.h> 49 #include <limits.h> 50 #include <signal.h> 51 #include <stdarg.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 #include <termios.h> 57 58 #include "systat.h" 59 #include "extern.h" 60 61 static int dellave; 62 63 kvm_t *kd; 64 char *memf = NULL; 65 char *nlistf = NULL; 66 sig_t sigtstpdfl; 67 double avenrun[3]; 68 int col; 69 double naptime = 1; 70 int verbose = 1; /* to report kvm read errs */ 71 int hz, stathz, maxslp; 72 char c; 73 char *namp; 74 char hostname[MAXHOSTNAMELEN + 1]; 75 WINDOW *wnd; 76 int CMDLINE; 77 int turns = 2; /* stay how many refresh-turns in 'all' mode? */ 78 int allflag; 79 int allcounter; 80 sig_atomic_t needsredraw = 0; 81 82 static WINDOW *wload; /* one line window for load average */ 83 84 static void (*sv_stop_handler)(int); 85 86 static void stop(int); 87 __dead static void usage(void); 88 89 gid_t egid; /* XXX needed by initiostat() and initkre() */ 90 91 int 92 main(int argc, char **argv) 93 { 94 int ch; 95 char errbuf[_POSIX2_LINE_MAX]; 96 const char *all; 97 struct clockinfo clk; 98 size_t len; 99 int bflag = 0; 100 101 all = "all"; 102 egid = getegid(); 103 (void)setegid(getgid()); 104 105 while ((ch = getopt(argc, argv, "M:N:bnw:t:")) != -1) 106 switch(ch) { 107 case 'M': 108 memf = optarg; 109 break; 110 case 'N': 111 nlistf = optarg; 112 break; 113 case 'b': 114 bflag = !bflag; 115 break; 116 case 'n': 117 nflag = !nflag; 118 break; 119 case 't': 120 if ((turns = atoi(optarg)) <= 0) 121 errx(1, "turns <= 0."); 122 break; 123 case 'w': 124 if ((naptime = strtod(optarg, NULL)) <= 0) 125 errx(1, "interval <= 0."); 126 break; 127 case '?': 128 default: 129 usage(); 130 } 131 argc -= optind; 132 argv += optind; 133 134 135 for ( ; argc > 0; argc--, argv++) { 136 struct mode *p; 137 int modefound = 0; 138 139 if (isdigit((unsigned char)argv[0][0])) { 140 naptime = strtod(argv[0], NULL); 141 if (naptime <= 0) 142 naptime = 5; 143 continue; 144 } 145 146 for (p = modes; p->c_name ; p++) { 147 if (strstr(p->c_name, argv[0]) == p->c_name) { 148 curmode = p; 149 modefound++; 150 break; 151 } 152 153 if (strstr(all, argv[0]) == all) { 154 allcounter=0; 155 allflag=1; 156 } 157 } 158 159 160 if (!modefound && !allflag) 161 error("%s: Unknown command.", argv[0]); 162 } 163 164 /* 165 * Discard setgid privileges. If not the running kernel, we toss 166 * them away totally so that bad guys can't print interesting stuff 167 * from kernel memory, otherwise switch back to kmem for the 168 * duration of the kvm_openfiles() call. 169 */ 170 if (nlistf != NULL || memf != NULL) 171 (void)setgid(getgid()); 172 else 173 (void)setegid(egid); 174 175 kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf); 176 if (kd == NULL) 177 errx(1, "%s", errbuf); 178 179 /* Get rid of privs for now. */ 180 if (nlistf == NULL && memf == NULL) 181 (void)setegid(getgid()); 182 183 signal(SIGINT, die); 184 signal(SIGQUIT, die); 185 signal(SIGTERM, die); 186 sv_stop_handler = signal(SIGTSTP, stop); 187 188 /* 189 * Initialize display. Load average appears in a one line 190 * window of its own. Current command's display appears in 191 * an overlapping sub-window of stdscr configured by the display 192 * routines to minimize update work by curses. 193 */ 194 if (initscr() == NULL) 195 errx(1, "couldn't initialize screen"); 196 197 CMDLINE = LINES - 1; 198 wnd = (*curmode->c_open)(); 199 if (wnd == NULL) { 200 move(CMDLINE, 0); 201 clrtoeol(); 202 refresh(); 203 endwin(); 204 warnx("couldn't initialize display"); 205 die(0); 206 } 207 wload = newwin(1, 0, 3, 20); 208 if (wload == NULL) { 209 move(CMDLINE, 0); 210 clrtoeol(); 211 refresh(); 212 endwin(); 213 warnx("couldn't set up load average window"); 214 die(0); 215 } 216 gethostname(hostname, sizeof (hostname)); 217 hostname[sizeof(hostname) - 1] = '\0'; 218 219 len = sizeof(clk); 220 if (sysctlbyname("kern.clockrate", &clk, &len, NULL, 0)) 221 error("can't get \"kern.clockrate\": %s", strerror(errno)); 222 hz = clk.hz; 223 stathz = clk.stathz; 224 225 len = sizeof(maxslp); 226 if (sysctlbyname("vm.maxslp", &maxslp, &len, NULL, 0)) 227 error("can't get \"vm.maxslp\": %s", strerror(errno)); 228 229 (*curmode->c_init)(); 230 curmode->c_flags |= CF_INIT; 231 labels(); 232 233 dellave = 0.0; 234 235 display(0); 236 if (!bflag) { 237 noecho(); 238 cbreak(); 239 keyboard(); 240 } else 241 die(0); 242 /*NOTREACHED*/ 243 } 244 245 static void 246 usage(void) 247 { 248 fprintf(stderr, "usage: systat [-bn] [-M core] [-N system] [-w wait] " 249 "[-t turns]\n\t\t[display] [refresh-interval]\n"); 250 exit(1); 251 } 252 253 254 void 255 labels(void) 256 { 257 if (curmode->c_flags & CF_LOADAV) { 258 mvaddstr(2, 20, 259 "/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10"); 260 mvaddstr(3, 5, "Load Average"); 261 } 262 (*curmode->c_label)(); 263 #ifdef notdef 264 mvprintw(21, 25, "CPU usage on %s", hostname); 265 #endif 266 refresh(); 267 } 268 269 void 270 display(int signo) 271 { 272 static int skip; 273 int j; 274 struct mode *p; 275 int ms_delay; 276 277 if (signo == SIGALRM && skip-- > 0) 278 /* Don't display on this timeout */ 279 return; 280 281 /* Get the load average over the last minute. */ 282 (void)getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])); 283 (*curmode->c_fetch)(); 284 if (curmode->c_flags & CF_LOADAV) { 285 j = 5.0*avenrun[0] + 0.5; 286 dellave -= avenrun[0]; 287 if (dellave >= 0.0) 288 c = '<'; 289 else { 290 c = '>'; 291 dellave = -dellave; 292 } 293 if (dellave < 0.1) 294 c = '|'; 295 dellave = avenrun[0]; 296 wmove(wload, 0, 0); 297 wclrtoeol(wload); 298 whline(wload, c, (j > 50) ? 50 : j); 299 if (j > 50) 300 wprintw(wload, " %4.1f", avenrun[0]); 301 } 302 (*curmode->c_refresh)(); 303 if (curmode->c_flags & CF_LOADAV) 304 wrefresh(wload); 305 wrefresh(wnd); 306 move(CMDLINE, col); 307 refresh(); 308 309 if (allflag && signo==SIGALRM) { 310 if (allcounter >= turns){ 311 p = curmode; 312 p++; 313 if (p->c_name == NULL) 314 p = modes; 315 switch_mode(p); 316 allcounter=0; 317 } else 318 allcounter++; 319 } 320 321 /* curses timeout() uses VTIME, limited to 255 1/10th secs */ 322 ms_delay = naptime * 1000; 323 if (ms_delay < 25500) { 324 timeout(ms_delay); 325 skip = 0; 326 } else { 327 skip = ms_delay / 25500; 328 timeout(ms_delay / (skip + 1)); 329 } 330 } 331 332 void 333 redraw(void) 334 { 335 resizeterm(LINES, COLS); 336 CMDLINE = LINES - 1; 337 labels(); 338 339 display(0); 340 needsredraw = 0; 341 } 342 343 static void 344 stop(int signo) 345 { 346 sigset_t set; 347 348 signal(SIGTSTP, sv_stop_handler); 349 /* unblock SIGTSTP */ 350 sigemptyset(&set); 351 sigaddset(&set, SIGTSTP); 352 sigprocmask(SIG_UNBLOCK, &set, NULL); 353 /* stop ourselves */ 354 kill(0, SIGTSTP); 355 /* must have been restarted */ 356 signal(SIGTSTP, stop); 357 needsredraw = signo; 358 } 359 360 void 361 die(int signo) 362 { 363 move(CMDLINE, 0); 364 clrtoeol(); 365 refresh(); 366 endwin(); 367 exit(0); 368 } 369 370 void 371 error(const char *fmt, ...) 372 { 373 va_list ap; 374 char buf[255]; 375 int oy, ox; 376 377 va_start(ap, fmt); 378 379 if (wnd) { 380 getyx(stdscr, oy, ox); 381 (void) vsnprintf(buf, sizeof(buf), fmt, ap); 382 clrtoeol(); 383 standout(); 384 mvaddstr(CMDLINE, 0, buf); 385 standend(); 386 move(oy, ox); 387 refresh(); 388 } else { 389 (void) vfprintf(stderr, fmt, ap); 390 fprintf(stderr, "\n"); 391 } 392 va_end(ap); 393 } 394 395 void 396 clearerror(void) 397 { 398 399 error("%s", ""); 400 } 401 402 void 403 nlisterr(struct nlist name_list[]) 404 { 405 int i, n; 406 407 n = 0; 408 clear(); 409 mvprintw(2, 10, "systat: nlist: can't find following symbols:"); 410 for (i = 0; 411 name_list[i].n_name != NULL && *name_list[i].n_name != '\0'; i++) 412 if (name_list[i].n_value == 0) 413 mvprintw(2 + ++n, 10, "%s", name_list[i].n_name); 414 move(CMDLINE, 0); 415 clrtoeol(); 416 refresh(); 417 endwin(); 418 exit(1); 419 } 420
Indexes created Fri Sep 26 08:10:20 GMT 2025