ps.c revision 1.35
1 /* $NetBSD: ps.c,v 1.35 2000/04/10 06:37:37 chs 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 1.35 2000/04/10 06:37:37 chs 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 if (strcmp(ttname, "co") == 0) 222 ttypath = _PATH_CONSOLE; 223 else if (*ttname != '/') 224 (void)snprintf(ttypath = pathbuf, 225 sizeof(pathbuf), "%s%s", _PATH_TTY, ttname); 226 else 227 ttypath = ttname; 228 if (stat(ttypath, &sb) == -1) 229 err(1, "%s", ttypath); 230 if (!S_ISCHR(sb.st_mode)) 231 errx(1, "%s: not a terminal", ttypath); 232 what = KERN_PROC_TTY; 233 flag = sb.st_rdev; 234 break; 235 } 236 case 'U': 237 if (*optarg != '\0') { 238 struct passwd *pw; 239 char *ep; 240 241 what = KERN_PROC_UID; 242 pw = getpwnam(optarg); 243 if (pw == NULL) { 244 errno = 0; 245 flag = strtoul(optarg, &ep, 10); 246 if (errno) 247 err(1, "%s", optarg); 248 if (*ep != '\0') 249 errx(1, "%s: illegal user name", 250 optarg); 251 } else 252 flag = pw->pw_uid; 253 } 254 break; 255 case 'u': 256 parsefmt(ufmt); 257 sortby = SORTCPU; 258 fmt = 1; 259 ufmt[0] = '\0'; 260 break; 261 case 'v': 262 parsefmt(vfmt); 263 sortby = SORTMEM; 264 fmt = 1; 265 vfmt[0] = '\0'; 266 break; 267 case 'W': 268 swapf = optarg; 269 break; 270 case 'w': 271 if (wflag) 272 termwidth = UNLIMITED; 273 else if (termwidth < 131) 274 termwidth = 131; 275 wflag++; 276 break; 277 case 'x': 278 xflg = 1; 279 break; 280 case '?': 281 default: 282 usage(); 283 } 284 argc -= optind; 285 argv += optind; 286 287 #define BACKWARD_COMPATIBILITY 288 #ifdef BACKWARD_COMPATIBILITY 289 if (*argv) { 290 nlistf = *argv; 291 if (*++argv) { 292 memf = *argv; 293 if (*++argv) 294 swapf = *argv; 295 } 296 } 297 #endif 298 /* 299 * Discard setgid privileges. If not the running kernel, we toss 300 * them away totally so that bad guys can't print interesting stuff 301 * from kernel memory, otherwise switch back to kmem for the 302 * duration of the kvm_openfiles() call. 303 */ 304 if (nlistf != NULL || memf != NULL || swapf != NULL) 305 (void)setgid(getgid()); 306 else 307 (void)setegid(egid); 308 309 kd = kvm_openfiles(nlistf, memf, swapf, O_RDONLY, errbuf); 310 if (kd == 0) { 311 if (dontuseprocfs) 312 errx(1, "%s", errbuf); 313 else { 314 warnx("kvm_openfiles: %s", errbuf); 315 fprintf(stderr, "ps: falling back to /proc-based lookup\n"); 316 } 317 } 318 319 if (nlistf == NULL && memf == NULL && swapf == NULL) 320 (void)setgid(getgid()); 321 322 if (!fmt) 323 parsefmt(dfmt); 324 325 /* 326 * scan requested variables, noting what structures are needed, 327 * and adjusting header widths as appropiate. 328 */ 329 scanvars(); 330 331 /* 332 * select procs 333 */ 334 if (!kd || !(kinfo = getkinfo_kvm(kd, what, flag, &nentries, needuser))) 335 { 336 /* If/when the /proc-based code is ripped out 337 * again, make sure all references to the -K 338 * option are also pulled (getopt(), usage(), 339 * man page). See the man page comments about 340 * this for more details. */ 341 /* sysctl() ought to provide some sort of 342 * always-working-but-minimal-functionality 343 * method of providing at least some of the 344 * process information. Unfortunately, such a 345 * change will require too much work to be put 346 * into 1.4. For now, enable this experimental 347 * /proc-based support instead (if /proc is 348 * mounted) to grab as much information as we can. 349 * The guts of emulating kvm_getprocs() is in 350 * the file procfs_ops.c. */ 351 if (kd) 352 warnx("%s.", kvm_geterr(kd)); 353 if (dontuseprocfs) { 354 exit(1); 355 } 356 /* procfs_getprocs supports all but the 357 * KERN_PROC_RUID flag. */ 358 kinfo = getkinfo_procfs(what, flag, &nentries); 359 if (kinfo == 0) { 360 errx(1, "fallback /proc-based lookup also failed. %s", 361 "Giving up..."); 362 } 363 fprintf(stderr, "%s%s", 364 "Warning: /proc does not provide ", 365 "valid data for all fields.\n"); 366 use_procfs = 1; 367 } 368 369 /* 370 * print header 371 */ 372 printheader(); 373 if (nentries == 0) 374 exit(0); 375 /* 376 * sort proc list 377 */ 378 qsort(kinfo, nentries, sizeof(KINFO), pscomp); 379 /* 380 * for each proc, call each variable output function. 381 */ 382 for (i = lineno = 0; i < nentries; i++) { 383 KINFO *ki = &kinfo[i]; 384 385 if (xflg == 0 && (KI_EPROC(ki)->e_tdev == NODEV || 386 (KI_PROC(ki)->p_flag & P_CONTROLT ) == 0)) 387 continue; 388 for (vent = vhead; vent; vent = vent->next) { 389 (vent->var->oproc)(ki, vent); 390 if (vent->next != NULL) 391 (void)putchar(' '); 392 } 393 (void)putchar('\n'); 394 if (prtheader && lineno++ == prtheader - 4) { 395 (void)putchar('\n'); 396 printheader(); 397 lineno = 0; 398 } 399 } 400 exit(eval); 401 /* NOTREACHED */ 402 } 403 404 static KINFO * 405 getkinfo_kvm(kd, what, flag, nentriesp, needuser) 406 kvm_t *kd; 407 int what, flag, *nentriesp, needuser; 408 { 409 struct kinfo_proc *kp; 410 KINFO *kinfo=NULL; 411 size_t i; 412 413 if ((kp = kvm_getprocs(kd, what, flag, nentriesp)) != 0) 414 { 415 if ((kinfo = malloc((*nentriesp) * sizeof(*kinfo))) == NULL) 416 err(1, NULL); 417 for (i = (*nentriesp); i-- > 0; kp++) { 418 kinfo[i].ki_p = kp; 419 if (needuser) 420 saveuser(&kinfo[i]); 421 } 422 } 423 424 return (kinfo); 425 } 426 427 static void 428 scanvars() 429 { 430 struct varent *vent; 431 VAR *v; 432 int i; 433 434 for (vent = vhead; vent; vent = vent->next) { 435 v = vent->var; 436 i = strlen(v->header); 437 if (v->width < i) 438 v->width = i; 439 totwidth += v->width + 1; /* +1 for space */ 440 if (v->flag & USER) 441 needuser = 1; 442 if (v->flag & COMM) 443 needcomm = 1; 444 } 445 totwidth--; 446 } 447 448 static void 449 saveuser(ki) 450 KINFO *ki; 451 { 452 struct pstats pstats; 453 struct usave *usp; 454 455 usp = &ki->ki_u; 456 if (kvm_read(kd, (u_long)&KI_PROC(ki)->p_addr->u_stats, 457 (char *)&pstats, sizeof(pstats)) == sizeof(pstats)) { 458 /* 459 * The u-area might be swapped out, and we can't get 460 * at it because we have a crashdump and no swap. 461 * If it's here fill in these fields, otherwise, just 462 * leave them 0. 463 */ 464 usp->u_start = pstats.p_start; 465 usp->u_ru = pstats.p_ru; 466 usp->u_cru = pstats.p_cru; 467 usp->u_valid = 1; 468 } else 469 usp->u_valid = 0; 470 } 471 472 static int 473 pscomp(a, b) 474 const void *a, *b; 475 { 476 int i; 477 #ifdef NEWVM 478 #define VSIZE(k) (KI_EPROC(k)->e_vm.vm_dsize + KI_EPROC(k)->e_vm.vm_ssize + \ 479 KI_EPROC(k)->e_vm.vm_tsize) 480 #else 481 #define VSIZE(k) ((k)->ki_p->p_dsize + (k)->ki_p->p_ssize + (k)->ki_e->e_xsize) 482 #endif 483 484 if (sortby == SORTCPU) 485 return (getpcpu((KINFO *)b) - getpcpu((KINFO *)a)); 486 if (sortby == SORTMEM) 487 return (VSIZE((KINFO *)b) - VSIZE((KINFO *)a)); 488 i = KI_EPROC((KINFO *)a)->e_tdev - KI_EPROC((KINFO *)b)->e_tdev; 489 if (i == 0) 490 i = KI_PROC((KINFO *)a)->p_pid - KI_PROC((KINFO *)b)->p_pid; 491 return (i); 492 } 493 494 /* 495 * ICK (all for getopt), would rather hide the ugliness 496 * here than taint the main code. 497 * 498 * ps foo -> ps -foo 499 * ps 34 -> ps -p34 500 * 501 * The old convention that 't' with no trailing tty arg means the user's 502 * tty, is only supported if argv[1] doesn't begin with a '-'. This same 503 * feature is available with the option 'T', which takes no argument. 504 */ 505 static char * 506 kludge_oldps_options(s) 507 char *s; 508 { 509 size_t len; 510 char *newopts, *ns, *cp; 511 512 len = strlen(s); 513 if ((newopts = ns = malloc(len + 3)) == NULL) 514 err(1, NULL); 515 /* 516 * options begin with '-' 517 */ 518 if (*s != '-') 519 *ns++ = '-'; /* add option flag */ 520 /* 521 * gaze to end of argv[1] 522 */ 523 cp = s + len - 1; 524 /* 525 * if last letter is a 't' flag with no argument (in the context 526 * of the oldps options -- option string NOT starting with a '-' -- 527 * then convert to 'T' (meaning *this* terminal, i.e. ttyname(0)). 528 */ 529 if (*cp == 't' && *s != '-') 530 *cp = 'T'; 531 else { 532 /* 533 * otherwise check for trailing number, which *may* be a 534 * pid. 535 */ 536 while (cp >= s && isdigit(*cp)) 537 --cp; 538 } 539 cp++; 540 memmove(ns, s, (size_t)(cp - s)); /* copy up to trailing number */ 541 ns += cp - s; 542 /* 543 * if there's a trailing number, and not a preceding 'p' (pid) or 544 * 't' (tty) flag, then assume it's a pid and insert a 'p' flag. 545 */ 546 if (isdigit(*cp) && 547 (cp == s || (cp[-1] != 'U' && cp[-1] != 't' && cp[-1] != 'p' && 548 (cp - 1 == s || cp[-2] != 't')))) 549 *ns++ = 'p'; 550 /* and append the number */ 551 (void)strcpy(ns, cp); /* XXX strcpy is safe */ 552 553 return (newopts); 554 } 555 556 static void 557 usage() 558 { 559 560 (void)fprintf(stderr, 561 "usage:\t%s\n\t %s\n\t%s\n", 562 "ps [-aChjKlmrSTuvwx] [-O|o fmt] [-p pid] [-t tty]", 563 "[-M core] [-N system] [-W swap] [-U username]", 564 "ps [-L]"); 565 exit(1); 566 /* NOTREACHED */ 567 } 568
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