ps.c revision 1.33
1 /* $NetBSD: ps.c,v 1.33 1999/12/03 02:16:41 simonb Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993, 1994 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) 1990, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)ps.c 8.4 (Berkeley) 4/2/94"; 45 #else 46 __RCSID("$NetBSD: ps.c,v 1.33 1999/12/03 02:16:41 simonb Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/user.h> 52 #include <sys/time.h> 53 #include <sys/resource.h> 54 #include <sys/proc.h> 55 #include <sys/stat.h> 56 #include <sys/ioctl.h> 57 #include <sys/sysctl.h> 58 59 #include <ctype.h> 60 #include <err.h> 61 #include <errno.h> 62 #include <fcntl.h> 63 #include <kvm.h> 64 #include <limits.h> 65 #include <nlist.h> 66 #include <paths.h> 67 #include <pwd.h> 68 #include <stdio.h> 69 #include <stdlib.h> 70 #include <string.h> 71 #include <unistd.h> 72 73 #include "ps.h" 74 75 #ifdef P_PPWAIT 76 #define NEWVM 77 #endif 78 79 KINFO *kinfo; 80 struct varent *vhead, *vtail; 81 82 int eval; /* exit value */ 83 int rawcpu; /* -C */ 84 int sumrusage; /* -S */ 85 int dontuseprocfs=0; /* -K */ 86 int termwidth; /* width of screen (0 == infinity) */ 87 int totwidth; /* calculated width of requested variables */ 88 89 int needuser, needcomm, needenv, commandonly, use_procfs; 90 uid_t myuid; 91 92 enum sort { DEFAULT, SORTMEM, SORTCPU } sortby = DEFAULT; 93 94 static KINFO *getkinfo_kvm __P((kvm_t *, int, int, int *, int)); 95 static char *kludge_oldps_options __P((char *)); 96 static int pscomp __P((const void *, const void *)); 97 static void saveuser __P((KINFO *)); 98 static void scanvars __P((void)); 99 static void usage __P((void)); 100 int main __P((int, char *[])); 101 102 char dfmt[] = "pid tt state time command"; 103 char jfmt[] = "user pid ppid pgid sess jobc state tt time command"; 104 char lfmt[] = "uid pid ppid cpu pri nice vsz rss wchan state tt time command"; 105 char o1[] = "pid"; 106 char o2[] = "tt state time command"; 107 char ufmt[] = "user pid %cpu %mem vsz rss tt state start time command"; 108 char vfmt[] = "pid state time sl re pagein vsz rss lim tsiz %cpu %mem command"; 109 110 kvm_t *kd; 111 112 int 113 main(argc, argv) 114 int argc; 115 char *argv[]; 116 { 117 struct varent *vent; 118 struct winsize ws; 119 gid_t egid = getegid(); 120 int ch, flag, i, fmt, lineno, nentries; 121 int prtheader, wflag, what, xflg; 122 char *nlistf, *memf, *swapf, errbuf[_POSIX2_LINE_MAX]; 123 char *ttname; 124 125 (void)setegid(getgid()); 126 if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, (char *)&ws) == -1 && 127 ioctl(STDERR_FILENO, TIOCGWINSZ, (char *)&ws) == -1 && 128 ioctl(STDIN_FILENO, TIOCGWINSZ, (char *)&ws) == -1) || 129 ws.ws_col == 0) 130 termwidth = 79; 131 else 132 termwidth = ws.ws_col - 1; 133 134 if (argc > 1) 135 argv[1] = kludge_oldps_options(argv[1]); 136 137 fmt = prtheader = wflag = xflg = 0; 138 what = KERN_PROC_UID; 139 flag = myuid = getuid(); 140 memf = nlistf = swapf = NULL; 141 while ((ch = getopt(argc, argv, 142 "acCeghjKLlM:mN:O:o:p:rSTt:U:uvW:wx")) != -1) 143 switch((char)ch) { 144 case 'a': 145 what = KERN_PROC_ALL; 146 flag = 0; 147 break; 148 case 'c': 149 commandonly = 1; 150 break; 151 case 'e': /* XXX set ufmt */ 152 needenv = 1; 153 break; 154 case 'C': 155 rawcpu = 1; 156 break; 157 case 'g': 158 break; /* no-op */ 159 case 'h': 160 prtheader = ws.ws_row > 5 ? ws.ws_row : 22; 161 break; 162 case 'j': 163 parsefmt(jfmt); 164 fmt = 1; 165 jfmt[0] = '\0'; 166 break; 167 case 'K': 168 dontuseprocfs=1; 169 break; 170 case 'L': 171 showkey(); 172 exit(0); 173 /* NOTREACHED */ 174 case 'l': 175 parsefmt(lfmt); 176 fmt = 1; 177 lfmt[0] = '\0'; 178 break; 179 case 'M': 180 memf = optarg; 181 break; 182 case 'm': 183 sortby = SORTMEM; 184 break; 185 case 'N': 186 nlistf = optarg; 187 break; 188 case 'O': 189 parsefmt(o1); 190 parsefmt(optarg); 191 parsefmt(o2); 192 o1[0] = o2[0] = '\0'; 193 fmt = 1; 194 break; 195 case 'o': 196 parsefmt(optarg); 197 fmt = 1; 198 break; 199 case 'p': 200 what = KERN_PROC_PID; 201 flag = atol(optarg); 202 xflg = 1; 203 break; 204 case 'r': 205 sortby = SORTCPU; 206 break; 207 case 'S': 208 sumrusage = 1; 209 break; 210 case 'T': 211 if ((ttname = ttyname(STDIN_FILENO)) == NULL) 212 errx(1, "stdin: not a terminal"); 213 goto tty; 214 case 't': 215 ttname = optarg; 216 tty: { 217 struct stat sb; 218 char *ttypath, pathbuf[MAXPATHLEN]; 219 220 if (strcmp(ttname, "co") == 0) 221 ttypath = _PATH_CONSOLE; 222 else if (*ttname != '/') 223 (void)snprintf(ttypath = pathbuf, 224 sizeof(pathbuf), "%s%s", _PATH_TTY, ttname); 225 else 226 ttypath = ttname; 227 if (stat(ttypath, &sb) == -1) 228 err(1, "%s", ttypath); 229 if (!S_ISCHR(sb.st_mode)) 230 errx(1, "%s: not a terminal", ttypath); 231 what = KERN_PROC_TTY; 232 flag = sb.st_rdev; 233 break; 234 } 235 case 'U': 236 if (*optarg != '\0') { 237 struct passwd *pw; 238 char *ep; 239 240 what = KERN_PROC_UID; 241 pw = getpwnam(optarg); 242 if (pw == NULL) { 243 errno = 0; 244 flag = strtoul(optarg, &ep, 10); 245 if (errno) 246 err(1, "%s", optarg); 247 if (*ep != '\0') 248 errx(1, "%s: illegal user name", 249 optarg); 250 } else 251 flag = pw->pw_uid; 252 } 253 break; 254 case 'u': 255 parsefmt(ufmt); 256 sortby = SORTCPU; 257 fmt = 1; 258 ufmt[0] = '\0'; 259 break; 260 case 'v': 261 parsefmt(vfmt); 262 sortby = SORTMEM; 263 fmt = 1; 264 vfmt[0] = '\0'; 265 break; 266 case 'W': 267 swapf = optarg; 268 break; 269 case 'w': 270 if (wflag) 271 termwidth = UNLIMITED; 272 else if (termwidth < 131) 273 termwidth = 131; 274 wflag++; 275 break; 276 case 'x': 277 xflg = 1; 278 break; 279 case '?': 280 default: 281 usage(); 282 } 283 argc -= optind; 284 argv += optind; 285 286 #define BACKWARD_COMPATIBILITY 287 #ifdef BACKWARD_COMPATIBILITY 288 if (*argv) { 289 nlistf = *argv; 290 if (*++argv) { 291 memf = *argv; 292 if (*++argv) 293 swapf = *argv; 294 } 295 } 296 #endif 297 /* 298 * Discard setgid privileges. If not the running kernel, we toss 299 * them away totally so that bad guys can't print interesting stuff 300 * from kernel memory, otherwise switch back to kmem for the 301 * duration of the kvm_openfiles() call. 302 */ 303 if (nlistf != NULL || memf != NULL || swapf != NULL) 304 (void)setgid(getgid()); 305 else 306 (void)setegid(egid); 307 308 kd = kvm_openfiles(nlistf, memf, swapf, O_RDONLY, errbuf); 309 if (kd == 0) { 310 if (dontuseprocfs) 311 errx(1, "%s", errbuf); 312 else { 313 warnx("kvm_openfiles: %s", errbuf); 314 fprintf(stderr, "ps: falling back to /proc-based lookup\n"); 315 } 316 } 317 318 if (nlistf == NULL && memf == NULL && swapf == NULL) 319 (void)setgid(getgid()); 320 321 if (!fmt) 322 parsefmt(dfmt); 323 324 /* 325 * scan requested variables, noting what structures are needed, 326 * and adjusting header widths as appropiate. 327 */ 328 scanvars(); 329 330 /* 331 * select procs 332 */ 333 if (!kd || !(kinfo = getkinfo_kvm(kd, what, flag, &nentries, needuser))) 334 { 335 /* If/when the /proc-based code is ripped out 336 * again, make sure all references to the -K 337 * option are also pulled (getopt(), usage(), 338 * man page). See the man page comments about 339 * this for more details. */ 340 /* sysctl() ought to provide some sort of 341 * always-working-but-minimal-functionality 342 * method of providing at least some of the 343 * process information. Unfortunately, such a 344 * change will require too much work to be put 345 * into 1.4. For now, enable this experimental 346 * /proc-based support instead (if /proc is 347 * mounted) to grab as much information as we can. 348 * The guts of emulating kvm_getprocs() is in 349 * the file procfs_ops.c. */ 350 if (kd) 351 warnx("%s.", kvm_geterr(kd)); 352 if (dontuseprocfs) { 353 exit(1); 354 } 355 /* procfs_getprocs supports all but the 356 * KERN_PROC_RUID flag. */ 357 kinfo = getkinfo_procfs(what, flag, &nentries); 358 if (kinfo == 0) { 359 errx(1, "fallback /proc-based lookup also failed. %s", 360 "Giving up..."); 361 } 362 fprintf(stderr, "%s%s", 363 "Warning: /proc does not provide ", 364 "valid data for all fields.\n"); 365 use_procfs = 1; 366 } 367 368 /* 369 * print header 370 */ 371 printheader(); 372 if (nentries == 0) 373 exit(0); 374 /* 375 * sort proc list 376 */ 377 qsort(kinfo, nentries, sizeof(KINFO), pscomp); 378 /* 379 * for each proc, call each variable output function. 380 */ 381 for (i = lineno = 0; i < nentries; i++) { 382 KINFO *ki = &kinfo[i]; 383 384 if (xflg == 0 && (KI_EPROC(ki)->e_tdev == NODEV || 385 (KI_PROC(ki)->p_flag & P_CONTROLT ) == 0)) 386 continue; 387 for (vent = vhead; vent; vent = vent->next) { 388 (vent->var->oproc)(ki, vent); 389 if (vent->next != NULL) 390 (void)putchar(' '); 391 } 392 (void)putchar('\n'); 393 if (prtheader && lineno++ == prtheader - 4) { 394 (void)putchar('\n'); 395 printheader(); 396 lineno = 0; 397 } 398 } 399 exit(eval); 400 /* NOTREACHED */ 401 } 402 403 static KINFO * 404 getkinfo_kvm(kd, what, flag, nentriesp, needuser) 405 kvm_t *kd; 406 int what, flag, *nentriesp, needuser; 407 { 408 struct kinfo_proc *kp; 409 KINFO *kinfo=NULL; 410 size_t i; 411 412 if ((kp = kvm_getprocs(kd, what, flag, nentriesp)) != 0) 413 { 414 if ((kinfo = malloc((*nentriesp) * sizeof(*kinfo))) == NULL) 415 err(1, NULL); 416 for (i = (*nentriesp); i-- > 0; kp++) { 417 kinfo[i].ki_p = kp; 418 if (needuser) 419 saveuser(&kinfo[i]); 420 } 421 } 422 423 return (kinfo); 424 } 425 426 static void 427 scanvars() 428 { 429 struct varent *vent; 430 VAR *v; 431 int i; 432 433 for (vent = vhead; vent; vent = vent->next) { 434 v = vent->var; 435 i = strlen(v->header); 436 if (v->width < i) 437 v->width = i; 438 totwidth += v->width + 1; /* +1 for space */ 439 if (v->flag & USER) 440 needuser = 1; 441 if (v->flag & COMM) 442 needcomm = 1; 443 } 444 totwidth--; 445 } 446 447 static void 448 saveuser(ki) 449 KINFO *ki; 450 { 451 struct pstats pstats; 452 struct usave *usp; 453 454 usp = &ki->ki_u; 455 if (kvm_read(kd, (u_long)&KI_PROC(ki)->p_addr->u_stats, 456 (char *)&pstats, sizeof(pstats)) == sizeof(pstats)) { 457 /* 458 * The u-area might be swapped out, and we can't get 459 * at it because we have a crashdump and no swap. 460 * If it's here fill in these fields, otherwise, just 461 * leave them 0. 462 */ 463 usp->u_start = pstats.p_start; 464 usp->u_ru = pstats.p_ru; 465 usp->u_cru = pstats.p_cru; 466 usp->u_valid = 1; 467 } else 468 usp->u_valid = 0; 469 } 470 471 static int 472 pscomp(a, b) 473 const void *a, *b; 474 { 475 int i; 476 #ifdef NEWVM 477 #define VSIZE(k) (KI_EPROC(k)->e_vm.vm_dsize + KI_EPROC(k)->e_vm.vm_ssize + \ 478 KI_EPROC(k)->e_vm.vm_tsize) 479 #else 480 #define VSIZE(k) ((k)->ki_p->p_dsize + (k)->ki_p->p_ssize + (k)->ki_e->e_xsize) 481 #endif 482 483 if (sortby == SORTCPU) 484 return (getpcpu((KINFO *)b) - getpcpu((KINFO *)a)); 485 if (sortby == SORTMEM) 486 return (VSIZE((KINFO *)b) - VSIZE((KINFO *)a)); 487 i = KI_EPROC((KINFO *)a)->e_tdev - KI_EPROC((KINFO *)b)->e_tdev; 488 if (i == 0) 489 i = KI_PROC((KINFO *)a)->p_pid - KI_PROC((KINFO *)b)->p_pid; 490 return (i); 491 } 492 493 /* 494 * ICK (all for getopt), would rather hide the ugliness 495 * here than taint the main code. 496 * 497 * ps foo -> ps -foo 498 * ps 34 -> ps -p34 499 * 500 * The old convention that 't' with no trailing tty arg means the user's 501 * tty, is only supported if argv[1] doesn't begin with a '-'. This same 502 * feature is available with the option 'T', which takes no argument. 503 */ 504 static char * 505 kludge_oldps_options(s) 506 char *s; 507 { 508 size_t len; 509 char *newopts, *ns, *cp; 510 511 len = strlen(s); 512 if ((newopts = ns = malloc(len + 3)) == NULL) 513 err(1, NULL); 514 /* 515 * options begin with '-' 516 */ 517 if (*s != '-') 518 *ns++ = '-'; /* add option flag */ 519 /* 520 * gaze to end of argv[1] 521 */ 522 cp = s + len - 1; 523 /* 524 * if last letter is a 't' flag with no argument (in the context 525 * of the oldps options -- option string NOT starting with a '-' -- 526 * then convert to 'T' (meaning *this* terminal, i.e. ttyname(0)). 527 */ 528 if (*cp == 't' && *s != '-') 529 *cp = 'T'; 530 else { 531 /* 532 * otherwise check for trailing number, which *may* be a 533 * pid. 534 */ 535 while (cp >= s && isdigit(*cp)) 536 --cp; 537 } 538 cp++; 539 memmove(ns, s, (size_t)(cp - s)); /* copy up to trailing number */ 540 ns += cp - s; 541 /* 542 * if there's a trailing number, and not a preceding 'p' (pid) or 543 * 't' (tty) flag, then assume it's a pid and insert a 'p' flag. 544 */ 545 if (isdigit(*cp) && 546 (cp == s || (cp[-1] != 'U' && cp[-1] != 't' && cp[-1] != 'p' && 547 (cp - 1 == s || cp[-2] != 't')))) 548 *ns++ = 'p'; 549 /* and append the number */ 550 (void)strcpy(ns, cp); /* XXX strcpy is safe */ 551 552 return (newopts); 553 } 554 555 static void 556 usage() 557 { 558 559 (void)fprintf(stderr, 560 "usage:\t%s\n\t %s\n\t%s\n", 561 "ps [-aChjKlmrSTuvwx] [-O|o fmt] [-p pid] [-t tty]", 562 "[-M core] [-N system] [-W swap]", 563 "ps [-L]"); 564 exit(1); 565 /* NOTREACHED */ 566 } 567
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