ps.c revision 1.36
1 /* $NetBSD: ps.c,v 1.36 2000/04/15 04:40:46 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 1.36 2000/04/15 04:40:46 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 dontuseprocfs = 1; 182 break; 183 case 'm': 184 sortby = SORTMEM; 185 break; 186 case 'N': 187 nlistf = optarg; 188 break; 189 case 'O': 190 parsefmt(o1); 191 parsefmt(optarg); 192 parsefmt(o2); 193 o1[0] = o2[0] = '\0'; 194 fmt = 1; 195 break; 196 case 'o': 197 parsefmt(optarg); 198 fmt = 1; 199 break; 200 case 'p': 201 what = KERN_PROC_PID; 202 flag = atol(optarg); 203 xflg = 1; 204 break; 205 case 'r': 206 sortby = SORTCPU; 207 break; 208 case 'S': 209 sumrusage = 1; 210 break; 211 case 'T': 212 if ((ttname = ttyname(STDIN_FILENO)) == NULL) 213 errx(1, "stdin: not a terminal"); 214 goto tty; 215 case 't': 216 ttname = optarg; 217 tty: { 218 struct stat sb; 219 char *ttypath, pathbuf[MAXPATHLEN]; 220 221 flag = 0; 222 if (strcmp(ttname, "?") == 0) 223 flag = KERN_PROC_TTY_NODEV; 224 else if (strcmp(ttname, "-") == 0) 225 flag = KERN_PROC_TTY_REVOKE; 226 else if (strcmp(ttname, "co") == 0) 227 ttypath = _PATH_CONSOLE; 228 else if (*ttname != '/') 229 (void)snprintf(ttypath = pathbuf, 230 sizeof(pathbuf), "%s%s", _PATH_TTY, ttname); 231 else 232 ttypath = ttname; 233 what = KERN_PROC_TTY; 234 if (flag == 0) { 235 if (stat(ttypath, &sb) == -1) 236 err(1, "%s", ttypath); 237 if (!S_ISCHR(sb.st_mode)) 238 errx(1, "%s: not a terminal", ttypath); 239 flag = sb.st_rdev; 240 } 241 break; 242 } 243 case 'U': 244 if (*optarg != '\0') { 245 struct passwd *pw; 246 char *ep; 247 248 what = KERN_PROC_UID; 249 pw = getpwnam(optarg); 250 if (pw == NULL) { 251 errno = 0; 252 flag = strtoul(optarg, &ep, 10); 253 if (errno) 254 err(1, "%s", optarg); 255 if (*ep != '\0') 256 errx(1, "%s: illegal user name", 257 optarg); 258 } else 259 flag = pw->pw_uid; 260 } 261 break; 262 case 'u': 263 parsefmt(ufmt); 264 sortby = SORTCPU; 265 fmt = 1; 266 ufmt[0] = '\0'; 267 break; 268 case 'v': 269 parsefmt(vfmt); 270 sortby = SORTMEM; 271 fmt = 1; 272 vfmt[0] = '\0'; 273 break; 274 case 'W': 275 swapf = optarg; 276 break; 277 case 'w': 278 if (wflag) 279 termwidth = UNLIMITED; 280 else if (termwidth < 131) 281 termwidth = 131; 282 wflag++; 283 break; 284 case 'x': 285 xflg = 1; 286 break; 287 case '?': 288 default: 289 usage(); 290 } 291 argc -= optind; 292 argv += optind; 293 294 #define BACKWARD_COMPATIBILITY 295 #ifdef BACKWARD_COMPATIBILITY 296 if (*argv) { 297 nlistf = *argv; 298 if (*++argv) { 299 memf = *argv; 300 if (*++argv) 301 swapf = *argv; 302 } 303 } 304 #endif 305 /* 306 * Discard setgid privileges. If not the running kernel, we toss 307 * them away totally so that bad guys can't print interesting stuff 308 * from kernel memory, otherwise switch back to kmem for the 309 * duration of the kvm_openfiles() call. 310 */ 311 if (nlistf != NULL || memf != NULL || swapf != NULL) 312 (void)setgid(getgid()); 313 else 314 (void)setegid(egid); 315 316 kd = kvm_openfiles(nlistf, memf, swapf, O_RDONLY, errbuf); 317 if (kd == 0) { 318 if (dontuseprocfs) 319 errx(1, "%s", errbuf); 320 else { 321 warnx("kvm_openfiles: %s", errbuf); 322 fprintf(stderr, "ps: falling back to /proc-based lookup\n"); 323 } 324 } 325 326 if (nlistf == NULL && memf == NULL && swapf == NULL) 327 (void)setgid(getgid()); 328 329 if (!fmt) 330 parsefmt(dfmt); 331 332 /* 333 * scan requested variables, noting what structures are needed, 334 * and adjusting header widths as appropiate. 335 */ 336 scanvars(); 337 338 /* 339 * select procs 340 */ 341 if (!kd || !(kinfo = getkinfo_kvm(kd, what, flag, &nentries, needuser))) 342 { 343 /* If/when the /proc-based code is ripped out 344 * again, make sure all references to the -K 345 * option are also pulled (getopt(), usage(), 346 * man page). See the man page comments about 347 * this for more details. */ 348 /* sysctl() ought to provide some sort of 349 * always-working-but-minimal-functionality 350 * method of providing at least some of the 351 * process information. Unfortunately, such a 352 * change will require too much work to be put 353 * into 1.4. For now, enable this experimental 354 * /proc-based support instead (if /proc is 355 * mounted) to grab as much information as we can. 356 * The guts of emulating kvm_getprocs() is in 357 * the file procfs_ops.c. */ 358 if (kd) 359 warnx("%s.", kvm_geterr(kd)); 360 if (dontuseprocfs) { 361 exit(1); 362 } 363 /* procfs_getprocs supports all but the 364 * KERN_PROC_RUID flag. */ 365 kinfo = getkinfo_procfs(what, flag, &nentries); 366 if (kinfo == 0) { 367 errx(1, "fallback /proc-based lookup also failed. %s", 368 "Giving up..."); 369 } 370 fprintf(stderr, "%s%s", 371 "Warning: /proc does not provide ", 372 "valid data for all fields.\n"); 373 use_procfs = 1; 374 } 375 376 /* 377 * print header 378 */ 379 printheader(); 380 if (nentries == 0) 381 exit(0); 382 /* 383 * sort proc list 384 */ 385 qsort(kinfo, nentries, sizeof(KINFO), pscomp); 386 /* 387 * for each proc, call each variable output function. 388 */ 389 for (i = lineno = 0; i < nentries; i++) { 390 KINFO *ki = &kinfo[i]; 391 392 if (xflg == 0 && (KI_EPROC(ki)->e_tdev == NODEV || 393 (KI_PROC(ki)->p_flag & P_CONTROLT ) == 0)) 394 continue; 395 for (vent = vhead; vent; vent = vent->next) { 396 (vent->var->oproc)(ki, vent); 397 if (vent->next != NULL) 398 (void)putchar(' '); 399 } 400 (void)putchar('\n'); 401 if (prtheader && lineno++ == prtheader - 4) { 402 (void)putchar('\n'); 403 printheader(); 404 lineno = 0; 405 } 406 } 407 exit(eval); 408 /* NOTREACHED */ 409 } 410 411 static KINFO * 412 getkinfo_kvm(kd, what, flag, nentriesp, needuser) 413 kvm_t *kd; 414 int what, flag, *nentriesp, needuser; 415 { 416 struct kinfo_proc *kp; 417 KINFO *kinfo=NULL; 418 size_t i; 419 420 if ((kp = kvm_getprocs(kd, what, flag, nentriesp)) != 0) 421 { 422 if ((kinfo = malloc((*nentriesp) * sizeof(*kinfo))) == NULL) 423 err(1, NULL); 424 for (i = (*nentriesp); i-- > 0; kp++) { 425 kinfo[i].ki_p = kp; 426 if (needuser) 427 saveuser(&kinfo[i]); 428 } 429 } 430 431 return (kinfo); 432 } 433 434 static void 435 scanvars() 436 { 437 struct varent *vent; 438 VAR *v; 439 int i; 440 441 for (vent = vhead; vent; vent = vent->next) { 442 v = vent->var; 443 i = strlen(v->header); 444 if (v->width < i) 445 v->width = i; 446 totwidth += v->width + 1; /* +1 for space */ 447 if (v->flag & USER) 448 needuser = 1; 449 if (v->flag & COMM) 450 needcomm = 1; 451 } 452 totwidth--; 453 } 454 455 static void 456 saveuser(ki) 457 KINFO *ki; 458 { 459 struct pstats pstats; 460 struct usave *usp; 461 462 usp = &ki->ki_u; 463 if (kvm_read(kd, (u_long)&KI_PROC(ki)->p_addr->u_stats, 464 (char *)&pstats, sizeof(pstats)) == sizeof(pstats)) { 465 /* 466 * The u-area might be swapped out, and we can't get 467 * at it because we have a crashdump and no swap. 468 * If it's here fill in these fields, otherwise, just 469 * leave them 0. 470 */ 471 usp->u_start = pstats.p_start; 472 usp->u_ru = pstats.p_ru; 473 usp->u_cru = pstats.p_cru; 474 usp->u_valid = 1; 475 } else 476 usp->u_valid = 0; 477 } 478 479 static int 480 pscomp(a, b) 481 const void *a, *b; 482 { 483 int i; 484 #ifdef NEWVM 485 #define VSIZE(k) (KI_EPROC(k)->e_vm.vm_dsize + KI_EPROC(k)->e_vm.vm_ssize + \ 486 KI_EPROC(k)->e_vm.vm_tsize) 487 #else 488 #define VSIZE(k) ((k)->ki_p->p_dsize + (k)->ki_p->p_ssize + (k)->ki_e->e_xsize) 489 #endif 490 491 if (sortby == SORTCPU) 492 return (getpcpu((KINFO *)b) - getpcpu((KINFO *)a)); 493 if (sortby == SORTMEM) 494 return (VSIZE((KINFO *)b) - VSIZE((KINFO *)a)); 495 i = KI_EPROC((KINFO *)a)->e_tdev - KI_EPROC((KINFO *)b)->e_tdev; 496 if (i == 0) 497 i = KI_PROC((KINFO *)a)->p_pid - KI_PROC((KINFO *)b)->p_pid; 498 return (i); 499 } 500 501 /* 502 * ICK (all for getopt), would rather hide the ugliness 503 * here than taint the main code. 504 * 505 * ps foo -> ps -foo 506 * ps 34 -> ps -p34 507 * 508 * The old convention that 't' with no trailing tty arg means the user's 509 * tty, is only supported if argv[1] doesn't begin with a '-'. This same 510 * feature is available with the option 'T', which takes no argument. 511 */ 512 static char * 513 kludge_oldps_options(s) 514 char *s; 515 { 516 size_t len; 517 char *newopts, *ns, *cp; 518 519 len = strlen(s); 520 if ((newopts = ns = malloc(len + 3)) == NULL) 521 err(1, NULL); 522 /* 523 * options begin with '-' 524 */ 525 if (*s != '-') 526 *ns++ = '-'; /* add option flag */ 527 /* 528 * gaze to end of argv[1] 529 */ 530 cp = s + len - 1; 531 /* 532 * if last letter is a 't' flag with no argument (in the context 533 * of the oldps options -- option string NOT starting with a '-' -- 534 * then convert to 'T' (meaning *this* terminal, i.e. ttyname(0)). 535 */ 536 if (*cp == 't' && *s != '-') 537 *cp = 'T'; 538 else { 539 /* 540 * otherwise check for trailing number, which *may* be a 541 * pid. 542 */ 543 while (cp >= s && isdigit(*cp)) 544 --cp; 545 } 546 cp++; 547 memmove(ns, s, (size_t)(cp - s)); /* copy up to trailing number */ 548 ns += cp - s; 549 /* 550 * if there's a trailing number, and not a preceding 'p' (pid) or 551 * 't' (tty) flag, then assume it's a pid and insert a 'p' flag. 552 */ 553 if (isdigit(*cp) && 554 (cp == s || (cp[-1] != 'U' && cp[-1] != 't' && cp[-1] != 'p' && 555 (cp - 1 == s || cp[-2] != 't')))) 556 *ns++ = 'p'; 557 /* and append the number */ 558 (void)strcpy(ns, cp); /* XXX strcpy is safe */ 559 560 return (newopts); 561 } 562 563 static void 564 usage() 565 { 566 567 (void)fprintf(stderr, 568 "usage:\t%s\n\t %s\n\t%s\n", 569 "ps [-aChjKlmrSTuvwx] [-O|o fmt] [-p pid] [-t tty]", 570 "[-M core] [-N system] [-W swap] [-U username]", 571 "ps [-L]"); 572 exit(1); 573 /* NOTREACHED */ 574 } 575
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