main.c revision 1.13
1 /* $NetBSD: main.c,v 1.13 1998/07/06 06:55:24 mrg 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1980, 1992, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #if 0 41 static char sccsid[] = "@(#)main.c 8.1 (Berkeley) 6/6/93"; 42 #endif 43 __RCSID("$NetBSD: main.c,v 1.13 1998/07/06 06:55:24 mrg Exp $"); 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 48 #include <err.h> 49 #include <limits.h> 50 #include <nlist.h> 51 #include <signal.h> 52 #include <stdio.h> 53 #include <string.h> 54 #include <unistd.h> 55 #include <stdlib.h> 56 #include <ctype.h> 57 58 #include "systat.h" 59 #include "extern.h" 60 61 static struct nlist namelist[] = { 62 #define X_FIRST 0 63 #define X_HZ 0 64 { "_hz" }, 65 #define X_STATHZ 1 66 { "_stathz" }, 67 { "" } 68 }; 69 static int dellave; 70 71 kvm_t *kd; 72 char *memf = NULL; 73 char *nlistf = NULL; 74 sig_t sigtstpdfl; 75 double avenrun[3]; 76 int col; 77 int naptime = 5; 78 int verbose = 1; /* to report kvm read errs */ 79 int hz, stathz; 80 char c; 81 char *namp; 82 char hostname[MAXHOSTNAMELEN + 1]; 83 WINDOW *wnd; 84 int CMDLINE; 85 86 static WINDOW *wload; /* one line window for load average */ 87 88 static void usage __P((void)); 89 int main __P((int, char **)); 90 91 int 92 main(argc, argv) 93 int argc; 94 char **argv; 95 { 96 int ch; 97 gid_t egid = getegid(); 98 char errbuf[_POSIX2_LINE_MAX]; 99 100 (void)setegid(getgid()); 101 while ((ch = getopt(argc, argv, "M:N:w:")) != -1) 102 switch(ch) { 103 case 'M': 104 memf = optarg; 105 break; 106 case 'N': 107 nlistf = optarg; 108 break; 109 case 'w': 110 if ((naptime = atoi(optarg)) <= 0) 111 errx(1, "interval <= 0."); 112 break; 113 case '?': 114 default: 115 usage(); 116 } 117 argc -= optind; 118 argv += optind; 119 /* 120 * Discard setgid privileges. If not the running kernel, we toss 121 * them away totally so that bad guys can't print interesting stuff 122 * from kernel memory, otherwise switch back to kmem for the 123 * duration of the kvm_openfiles() call. 124 */ 125 if (nlistf != NULL || memf != NULL) 126 (void)setgid(getgid()); 127 else 128 (void)setegid(egid); 129 130 while (argc > 0) { 131 if (isdigit(argv[0][0])) { 132 naptime = atoi(argv[0]); 133 if (naptime <= 0) 134 naptime = 5; 135 } else { 136 struct cmdtab *p; 137 138 p = lookup(&argv[0][0]); 139 if (p == (struct cmdtab *)-1) 140 errx(1, "ambiguous request: %s", &argv[0][0]); 141 if (p == 0) 142 errx(1, "unknown request: %s", &argv[0][0]); 143 curcmd = p; 144 } 145 argc--, argv++; 146 } 147 148 kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf); 149 if (kd == NULL) { 150 error("%s", errbuf); 151 exit(1); 152 } 153 /* get rid of it now anyway */ 154 if (nlistf == NULL && memf == NULL) 155 (void)setgid(getgid()); 156 if (kvm_nlist(kd, namelist)) { 157 nlisterr(namelist); 158 exit(1); 159 } 160 if (namelist[X_FIRST].n_type == 0) 161 errx(1, "couldn't read namelist"); 162 signal(SIGINT, die); 163 signal(SIGQUIT, die); 164 signal(SIGTERM, die); 165 signal(SIGWINCH, redraw); 166 167 /* 168 * Initialize display. Load average appears in a one line 169 * window of its own. Current command's display appears in 170 * an overlapping sub-window of stdscr configured by the display 171 * routines to minimize update work by curses. 172 */ 173 if (initscr() == NULL) 174 { 175 warnx("couldn't initialize screen"); 176 exit(0); 177 } 178 179 CMDLINE = LINES - 1; 180 wnd = (*curcmd->c_open)(); 181 if (wnd == NULL) { 182 warnx("couldn't initialize display"); 183 die(0); 184 } 185 wload = newwin(1, 0, 3, 20); 186 if (wload == NULL) { 187 warnx("couldn't set up load average window"); 188 die(0); 189 } 190 gethostname(hostname, sizeof (hostname)); 191 hostname[sizeof(hostname) - 1] = '\0'; 192 NREAD(X_HZ, &hz, LONG); 193 NREAD(X_STATHZ, &stathz, LONG); 194 (*curcmd->c_init)(); 195 curcmd->c_flags |= CF_INIT; 196 labels(); 197 198 dellave = 0.0; 199 200 signal(SIGALRM, display); 201 display(0); 202 noecho(); 203 crmode(); 204 keyboard(); 205 /*NOTREACHED*/ 206 } 207 208 static void 209 usage() 210 { 211 fprintf(stderr, "usage: systat [-M core] [-N system] [-w wait]\n"); 212 exit(1); 213 } 214 215 216 void 217 labels() 218 { 219 if (curcmd->c_flags & CF_LOADAV) { 220 mvaddstr(2, 20, 221 "/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10"); 222 mvaddstr(3, 5, "Load Average"); 223 } 224 (*curcmd->c_label)(); 225 #ifdef notdef 226 mvprintw(21, 25, "CPU usage on %s", hostname); 227 #endif 228 refresh(); 229 } 230 231 void 232 display(signo) 233 int signo; 234 { 235 int i, j; 236 237 /* Get the load average over the last minute. */ 238 (void) getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])); 239 (*curcmd->c_fetch)(); 240 if (curcmd->c_flags & CF_LOADAV) { 241 j = 5.0*avenrun[0] + 0.5; 242 dellave -= avenrun[0]; 243 if (dellave >= 0.0) 244 c = '<'; 245 else { 246 c = '>'; 247 dellave = -dellave; 248 } 249 if (dellave < 0.1) 250 c = '|'; 251 dellave = avenrun[0]; 252 wmove(wload, 0, 0); wclrtoeol(wload); 253 for (i = (j > 50) ? 50 : j; i > 0; i--) 254 waddch(wload, c); 255 if (j > 50) 256 wprintw(wload, " %4.1f", avenrun[0]); 257 } 258 (*curcmd->c_refresh)(); 259 if (curcmd->c_flags & CF_LOADAV) 260 wrefresh(wload); 261 wrefresh(wnd); 262 move(CMDLINE, col); 263 refresh(); 264 alarm(naptime); 265 } 266 267 void 268 redraw(signo) 269 int signo; 270 { 271 sigset_t set; 272 273 sigemptyset(&set); 274 sigaddset(&set, SIGALRM); 275 sigprocmask(SIG_BLOCK, &set, NULL); 276 wrefresh(curscr); 277 refresh(); 278 sigprocmask(SIG_UNBLOCK, &set, NULL); 279 } 280 281 void 282 load() 283 { 284 285 (void) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])); 286 mvprintw(CMDLINE, 0, "%4.1f %4.1f %4.1f", 287 avenrun[0], avenrun[1], avenrun[2]); 288 clrtoeol(); 289 } 290 291 void 292 die(signo) 293 int signo; 294 { 295 move(CMDLINE, 0); 296 clrtoeol(); 297 refresh(); 298 endwin(); 299 exit(0); 300 } 301 302 #if __STDC__ 303 #include <stdarg.h> 304 #else 305 #include <varargs.h> 306 #endif 307 308 #if __STDC__ 309 void 310 error(const char *fmt, ...) 311 #else 312 void 313 error(fmt, va_alist) 314 char *fmt; 315 va_dcl 316 #endif 317 { 318 va_list ap; 319 char buf[255]; 320 int oy, ox; 321 #if __STDC__ 322 va_start(ap, fmt); 323 #else 324 va_start(ap); 325 #endif 326 327 if (wnd) { 328 getyx(stdscr, oy, ox); 329 (void) vsprintf(buf, fmt, ap); 330 clrtoeol(); 331 standout(); 332 mvaddstr(CMDLINE, 0, buf); 333 standend(); 334 move(oy, ox); 335 refresh(); 336 } else { 337 (void) vfprintf(stderr, fmt, ap); 338 fprintf(stderr, "\n"); 339 } 340 va_end(ap); 341 } 342 343 void 344 nlisterr(namelist) 345 struct nlist namelist[]; 346 { 347 int i, n; 348 349 n = 0; 350 clear(); 351 mvprintw(2, 10, "systat: nlist: can't find following symbols:"); 352 for (i = 0; 353 namelist[i].n_name != NULL && *namelist[i].n_name != '\0'; i++) 354 if (namelist[i].n_value == 0) 355 mvprintw(2 + ++n, 10, "%s", namelist[i].n_name); 356 move(CMDLINE, 0); 357 clrtoeol(); 358 refresh(); 359 endwin(); 360 exit(1); 361 } 362
Indexes created Thu Sep 25 16:09:42 GMT 2025