savecore.c revision 1.52
1/* $NetBSD: savecore.c,v 1.52 2001/06/13 23:16:27 wiz Exp $ */ 2 3/*- 4 * Copyright (c) 1986, 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) 1986, 1992, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40#endif /* not lint */ 41 42#ifndef lint 43#if 0 44static char sccsid[] = "@(#)savecore.c 8.5 (Berkeley) 4/28/95"; 45#else 46__RCSID("$NetBSD: savecore.c,v 1.52 2001/06/13 23:16:27 wiz Exp $"); 47#endif 48#endif /* not lint */ 49 50#include <sys/param.h> 51#include <sys/mount.h> 52#include <sys/msgbuf.h> 53#include <sys/syslog.h> 54#include <sys/time.h> 55 56#include <dirent.h> 57#include <errno.h> 58#include <fcntl.h> 59#include <nlist.h> 60#include <paths.h> 61#include <stddef.h> 62#include <stdio.h> 63#include <stdlib.h> 64#include <string.h> 65#include <time.h> 66#include <tzfile.h> 67#include <unistd.h> 68#include <util.h> 69#include <limits.h> 70#include <kvm.h> 71 72extern FILE *zopen(const char *fname, const char *mode); 73 74#define KREAD(kd, addr, p)\ 75 (kvm_read(kd, addr, (char *)(p), sizeof(*(p))) != sizeof(*(p))) 76 77struct nlist current_nl[] = { /* Namelist for currently running system. */ 78#define X_DUMPDEV 0 79 { "_dumpdev" }, 80#define X_DUMPLO 1 81 { "_dumplo" }, 82#define X_TIME 2 83 { "_time" }, 84#define X_DUMPSIZE 3 85 { "_dumpsize" }, 86#define X_VERSION 4 87 { "_version" }, 88#define X_DUMPMAG 5 89 { "_dumpmag" }, 90#define X_PANICSTR 6 91 { "_panicstr" }, 92#define X_PANICSTART 7 93 { "_panicstart" }, 94#define X_PANICEND 8 95 { "_panicend" }, 96#define X_MSGBUF 9 97 { "_msgbufp" }, 98 { NULL }, 99}; 100int cursyms[] = { X_DUMPDEV, X_DUMPLO, X_VERSION, X_DUMPMAG, -1 }; 101int dumpsyms[] = { X_TIME, X_DUMPSIZE, X_VERSION, X_PANICSTR, X_DUMPMAG, -1 }; 102 103struct nlist dump_nl[] = { /* Name list for dumped system. */ 104 { "_dumpdev" }, /* Entries MUST be the same as */ 105 { "_dumplo" }, /* those in current_nl[]. */ 106 { "_time" }, 107 { "_dumpsize" }, 108 { "_version" }, 109 { "_dumpmag" }, 110 { "_panicstr" }, 111 { "_panicstart" }, 112 { "_panicend" }, 113 { "_msgbufp" }, 114 { NULL }, 115}; 116 117/* Types match kernel declarations. */ 118long dumplo; /* where dump starts on dumpdev */ 119int dumpmag; /* magic number in dump */ 120int dumpsize; /* amount of memory dumped */ 121 122const char *kernel; /* name of used kernel */ 123char *dirname; /* directory to save dumps in */ 124char *ddname; /* name of dump device */ 125dev_t dumpdev; /* dump device */ 126int dumpfd; /* read/write descriptor on block dev */ 127kvm_t *kd_dump; /* kvm descriptor on block dev */ 128time_t now; /* current date */ 129char panic_mesg[1024]; 130long panicstr; 131char vers[1024]; 132 133static int clear, compress, force, verbose; /* flags */ 134 135void check_kmem(void); 136int check_space(void); 137void clear_dump(void); 138int Create(char *, int); 139int dump_exists(void); 140char *find_dev(dev_t, int); 141int get_crashtime(void); 142void kmem_setup(void); 143void log(int, char *, ...); 144void Lseek(int, off_t, int); 145int main(int, char *[]); 146int Open(const char *, int rw); 147char *rawname(char *s); 148void save_core(void); 149void usage(void); 150void Write(int, void *, int); 151 152int 153main(int argc, char *argv[]) 154{ 155 int ch; 156 157 dirname = NULL; 158 kernel = NULL; 159 160 openlog("savecore", LOG_PERROR, LOG_DAEMON); 161 162 while ((ch = getopt(argc, argv, "cdfN:vz")) != -1) 163 switch(ch) { 164 case 'c': 165 clear = 1; 166 break; 167 case 'd': /* Not documented. */ 168 case 'v': 169 verbose = 1; 170 break; 171 case 'f': 172 force = 1; 173 break; 174 case 'N': 175 kernel = optarg; 176 break; 177 case 'z': 178 compress = 1; 179 break; 180 case '?': 181 default: 182 usage(); 183 } 184 argc -= optind; 185 argv += optind; 186 187 if (argc != (clear ? 0 : 1)) 188 usage(); 189 190 if (!clear) 191 dirname = argv[0]; 192 193 if (kernel == NULL) { 194 kernel = getbootfile(); 195 } 196 197 (void)time(&now); 198 kmem_setup(); 199 200 if (clear) { 201 clear_dump(); 202 exit(0); 203 } 204 205 if (!dump_exists() && !force) 206 exit(1); 207 208 check_kmem(); 209 210 if (panicstr) 211 syslog(LOG_ALERT, "reboot after panic: %s", panic_mesg); 212 else 213 syslog(LOG_ALERT, "reboot"); 214 215 if ((!get_crashtime() || !check_space()) && !force) 216 exit(1); 217 218 save_core(); 219 220 clear_dump(); 221 exit(0); 222} 223 224void 225kmem_setup(void) 226{ 227 kvm_t *kd_kern; 228 char errbuf[_POSIX2_LINE_MAX]; 229 int i, hdrsz; 230 231 /* 232 * Some names we need for the currently running system, others for 233 * the system that was running when the dump was made. The values 234 * obtained from the current system are used to look for things in 235 * /dev/kmem that cannot be found in the kernel namelist, but are 236 * presumed to be the same (since the disk partitions are probably 237 * the same!) 238 */ 239 kd_kern = kvm_openfiles(kernel, NULL, NULL, O_RDONLY, errbuf); 240 if (kd_kern == NULL) { 241 syslog(LOG_ERR, "%s: kvm_openfiles: %s", kernel, errbuf); 242 exit(1); 243 } 244 if (kvm_nlist(kd_kern, current_nl) == -1) 245 syslog(LOG_ERR, "%s: kvm_nlist: %s", kernel, 246 kvm_geterr(kd_kern)); 247 248 for (i = 0; cursyms[i] != -1; i++) 249 if (current_nl[cursyms[i]].n_value == 0) { 250 syslog(LOG_ERR, "%s: %s not in namelist", 251 kernel, current_nl[cursyms[i]].n_name); 252 exit(1); 253 } 254 255 if (KREAD(kd_kern, current_nl[X_DUMPDEV].n_value, &dumpdev) != 0) { 256 if (verbose) 257 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 258 exit(1); 259 } 260 if (dumpdev == NODEV) { 261 syslog(LOG_WARNING, "no core dump (no dumpdev)"); 262 exit(1); 263 } 264 if (KREAD(kd_kern, current_nl[X_DUMPLO].n_value, &dumplo) != 0) { 265 if (verbose) 266 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 267 exit(1); 268 } 269 if (dumplo == -1) { 270 syslog(LOG_WARNING, "no core dump (invalid dumplo)"); 271 exit(1); 272 } 273 dumplo *= DEV_BSIZE; 274 if (verbose) 275 (void)printf("dumplo = %ld (%ld * %ld)\n", 276 (long)dumplo, (long)(dumplo / DEV_BSIZE), (long)DEV_BSIZE); 277 if (KREAD(kd_kern, current_nl[X_DUMPMAG].n_value, &dumpmag) != 0) { 278 if (verbose) 279 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 280 exit(1); 281 } 282 283 (void)kvm_read(kd_kern, current_nl[X_VERSION].n_value, vers, 284 sizeof(vers)); 285 vers[sizeof(vers) - 1] = '\0'; 286 287 ddname = find_dev(dumpdev, S_IFBLK); 288 dumpfd = Open(ddname, O_RDWR); 289 290 kd_dump = kvm_openfiles(kernel, ddname, NULL, O_RDWR, errbuf); 291 if (kd_dump == NULL) { 292 syslog(LOG_ERR, "%s: kvm_openfiles: %s", kernel, errbuf); 293 exit(1); 294 } 295 296 if (kvm_nlist(kd_dump, dump_nl) == -1) 297 syslog(LOG_ERR, "%s: kvm_nlist: %s", kernel, 298 kvm_geterr(kd_dump)); 299 300 for (i = 0; dumpsyms[i] != -1; i++) 301 if (dump_nl[dumpsyms[i]].n_value == 0) { 302 syslog(LOG_ERR, "%s: %s not in namelist", 303 kernel, dump_nl[dumpsyms[i]].n_name); 304 exit(1); 305 } 306 hdrsz = kvm_dump_mkheader(kd_dump, (off_t)dumplo); 307 308 /* 309 * If 'hdrsz' == 0, kvm_dump_mkheader() failed on the magic-number 310 * checks, ergo no dump is present... 311 */ 312 if (hdrsz == 0) { 313 syslog(LOG_WARNING, "no core dump"); 314 exit(1); 315 } 316 if (hdrsz == -1) { 317 syslog(LOG_ERR, "%s: kvm_dump_mkheader: %s", kernel, 318 kvm_geterr(kd_dump)); 319 exit(1); 320 } 321 dumplo += hdrsz; 322 kvm_close(kd_kern); 323} 324 325void 326check_kmem(void) 327{ 328 char *cp, *bufdata; 329 struct kern_msgbuf msgbuf, *bufp; 330 long panicloc, panicstart, panicend; 331 char core_vers[1024]; 332 333 (void)kvm_read(kd_dump, dump_nl[X_VERSION].n_value, core_vers, 334 sizeof(core_vers)); 335 core_vers[sizeof(core_vers) - 1] = '\0'; 336 337 if (strcmp(vers, core_vers) != 0) 338 syslog(LOG_WARNING, 339 "warning: %s version mismatch:\n\t%s\nand\t%s\n", 340 kernel, vers, core_vers); 341 342 panicstart = panicend = 0; 343 if (KREAD(kd_dump, dump_nl[X_PANICSTART].n_value, &panicstart) != 0) { 344 if (verbose) 345 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 346 goto nomsguf; 347 } 348 if (KREAD(kd_dump, dump_nl[X_PANICEND].n_value, &panicend) != 0) { 349 if (verbose) 350 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 351 goto nomsguf; 352 } 353 if (panicstart != 0 && panicend != 0) { 354 if (KREAD(kd_dump, dump_nl[X_MSGBUF].n_value, &bufp)) { 355 if (verbose) 356 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 357 goto nomsguf; 358 } 359 if (kvm_read(kd_dump, (long)bufp, &msgbuf, 360 offsetof(struct kern_msgbuf, msg_bufc)) != 361 offsetof(struct kern_msgbuf, msg_bufc)) { 362 if (verbose) 363 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 364 goto nomsguf; 365 } 366 if (msgbuf.msg_magic != MSG_MAGIC) { 367 if (verbose) 368 syslog(LOG_WARNING, "msgbuf magic incorrect"); 369 goto nomsguf; 370 } 371 bufdata = malloc(msgbuf.msg_bufs); 372 if (bufdata == NULL) { 373 if (verbose) 374 syslog(LOG_WARNING, "couldn't allocate space for msgbuf data"); 375 goto nomsguf; 376 } 377 if (kvm_read(kd_dump, (long)&bufp->msg_bufc, bufdata, 378 msgbuf.msg_bufs) != msgbuf.msg_bufs) { 379 if (verbose) 380 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 381 goto nomsguf; 382 } 383 cp = panic_mesg; 384 while (panicstart != panicend && cp < &panic_mesg[sizeof(panic_mesg)-1]) { 385 *cp++ = bufdata[panicstart]; 386 panicstart++; 387 if (panicstart >= msgbuf.msg_bufs) 388 panicstart = 0; 389 } 390 /* Don't end in a new-line */ 391 cp = &panic_mesg[strlen(panic_mesg)] - 1; 392 if (*cp == '\n') 393 *cp = '\0'; 394 panic_mesg[sizeof(panic_mesg) - 1] = '\0'; 395 396 panicstr = 1; /* anything not zero */ 397 return; 398 } 399nomsguf: 400 if (KREAD(kd_dump, dump_nl[X_PANICSTR].n_value, &panicstr) != 0) { 401 if (verbose) 402 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 403 return; 404 } 405 if (panicstr) { 406 cp = panic_mesg; 407 panicloc = panicstr; 408 do { 409 if (KREAD(kd_dump, panicloc, cp) != 0) { 410 if (verbose) 411 syslog(LOG_WARNING, "kvm_read: %s", 412 kvm_geterr(kd_dump)); 413 break; 414 } 415 panicloc++; 416 } while (*cp++ && cp < &panic_mesg[sizeof(panic_mesg)-1]); 417 panic_mesg[sizeof(panic_mesg) - 1] = '\0'; 418 } 419} 420 421int 422dump_exists(void) 423{ 424 int newdumpmag; 425 426 if (KREAD(kd_dump, dump_nl[X_DUMPMAG].n_value, &newdumpmag) != 0) { 427 if (verbose) 428 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 429 return (0); 430 } 431 432 /* Read the dump size. */ 433 if (KREAD(kd_dump, dump_nl[X_DUMPSIZE].n_value, &dumpsize) != 0) { 434 if (verbose) 435 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 436 return (0); 437 } 438 dumpsize *= getpagesize(); 439 440 /* 441 * Return zero if core dump doesn't seem to be there, and note 442 * it for syslog. This check and return happens after the dump size 443 * is read, so dumpsize is whether or not the core is valid (for -f). 444 */ 445 if (newdumpmag != dumpmag) { 446 if (verbose) 447 syslog(LOG_WARNING, 448 "magic number mismatch (0x%x != 0x%x)", 449 newdumpmag, dumpmag); 450 syslog(LOG_WARNING, "no core dump"); 451 return (0); 452 } 453 return (1); 454} 455 456void 457clear_dump(void) 458{ 459 if (kvm_dump_inval(kd_dump) == -1) 460 syslog(LOG_ERR, "%s: kvm_clear_dump: %s", ddname, 461 kvm_geterr(kd_dump)); 462 463} 464 465char buf[1024 * 1024]; 466 467void 468save_core(void) 469{ 470 FILE *fp; 471 int bounds, ifd, nr, nw, ofd; 472 char *rawp, path[MAXPATHLEN]; 473 474 ofd = -1; 475 /* 476 * Get the current number and update the bounds file. Do the update 477 * now, because may fail later and don't want to overwrite anything. 478 */ 479 umask(066); 480 (void)snprintf(path, sizeof(path), "%s/bounds", dirname); 481 if ((fp = fopen(path, "r")) == NULL) 482 goto err1; 483 if (fgets(buf, sizeof(buf), fp) == NULL) { 484 if (ferror(fp)) 485err1: syslog(LOG_WARNING, "%s: %m", path); 486 bounds = 0; 487 } else 488 bounds = atoi(buf); 489 if (fp != NULL) 490 (void)fclose(fp); 491 if ((fp = fopen(path, "w")) == NULL) 492 syslog(LOG_ERR, "%s: %m", path); 493 else { 494 (void)fprintf(fp, "%d\n", bounds + 1); 495 (void)fclose(fp); 496 } 497 498 /* Create the core file. */ 499 (void)snprintf(path, sizeof(path), "%s/netbsd.%d.core%s", 500 dirname, bounds, compress ? ".gz" : ""); 501 if (compress) { 502 if ((fp = zopen(path, "w")) == NULL) { 503 syslog(LOG_ERR, "%s: %m", path); 504 exit(1); 505 } 506 } else { 507 ofd = Create(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); 508 fp = fdopen(ofd, "w"); 509 if (fp == NULL) { 510 syslog(LOG_ERR, "%s: fdopen: %m", path); 511 exit(1); 512 } 513 } 514 515 /* Open the raw device. */ 516 rawp = rawname(ddname); 517 if ((ifd = open(rawp, O_RDONLY)) == -1) { 518 syslog(LOG_WARNING, "%s: %m; using block device", rawp); 519 ifd = dumpfd; 520 } 521 522 /* Seek to the start of the core. */ 523 Lseek(ifd, (off_t)dumplo, SEEK_SET); 524 525 if (kvm_dump_wrtheader(kd_dump, fp, dumpsize) == -1) { 526 syslog(LOG_ERR, "kvm_dump_wrtheader: %s : %s", path, 527 kvm_geterr(kd_dump)); 528 exit(1); 529 } 530 531 /* Copy the core file. */ 532 syslog(LOG_NOTICE, "writing %score to %s", 533 compress ? "compressed " : "", path); 534 for (; dumpsize > 0; dumpsize -= nr) { 535 (void)printf("%8dK\r", dumpsize / 1024); 536 (void)fflush(stdout); 537 nr = read(ifd, buf, MIN(dumpsize, sizeof(buf))); 538 if (nr <= 0) { 539 if (nr == 0) 540 syslog(LOG_WARNING, 541 "WARNING: EOF on dump device"); 542 else 543 syslog(LOG_ERR, "%s: %m", rawp); 544 goto err2; 545 } 546 nw = fwrite(buf, 1, nr, fp); 547 if (nw != nr) { 548 syslog(LOG_ERR, "%s: %s", 549 path, strerror(nw == 0 ? EIO : errno)); 550err2: syslog(LOG_WARNING, 551 "WARNING: core may be incomplete"); 552 (void)printf("\n"); 553 exit(1); 554 } 555 } 556 (void)close(ifd); 557 (void)fclose(fp); 558 559 /* Copy the kernel. */ 560 ifd = Open(kernel, O_RDONLY); 561 (void)snprintf(path, sizeof(path), "%s/netbsd.%d%s", 562 dirname, bounds, compress ? ".gz" : ""); 563 if (compress) { 564 if ((fp = zopen(path, "w")) == NULL) { 565 syslog(LOG_ERR, "%s: %m", path); 566 exit(1); 567 } 568 } else 569 ofd = Create(path, S_IRUSR | S_IWUSR); 570 syslog(LOG_NOTICE, "writing %skernel to %s", 571 compress ? "compressed " : "", path); 572 while ((nr = read(ifd, buf, sizeof(buf))) > 0) { 573 if (compress) 574 nw = fwrite(buf, 1, nr, fp); 575 else 576 nw = write(ofd, buf, nr); 577 if (nw != nr) { 578 syslog(LOG_ERR, "%s: %s", 579 path, strerror(nw == 0 ? EIO : errno)); 580 syslog(LOG_WARNING, 581 "WARNING: kernel may be incomplete"); 582 exit(1); 583 } 584 } 585 if (nr < 0) { 586 syslog(LOG_ERR, "%s: %m", kernel); 587 syslog(LOG_WARNING, "WARNING: kernel may be incomplete"); 588 exit(1); 589 } 590 if (compress) 591 (void)fclose(fp); 592 else 593 (void)close(ofd); 594} 595 596char * 597find_dev(dev_t dev, int type) 598{ 599 DIR *dfd; 600 struct dirent *dir; 601 struct stat sb; 602 char *dp, devname[MAXPATHLEN + 1]; 603 604 if ((dfd = opendir(_PATH_DEV)) == NULL) { 605 syslog(LOG_ERR, "%s: %m", _PATH_DEV); 606 exit(1); 607 } 608 (void)strcpy(devname, _PATH_DEV); 609 while ((dir = readdir(dfd))) { 610 (void)strcpy(devname + sizeof(_PATH_DEV) - 1, dir->d_name); 611 if (lstat(devname, &sb)) { 612 syslog(LOG_ERR, "%s: %m", devname); 613 continue; 614 } 615 if ((sb.st_mode & S_IFMT) != type) 616 continue; 617 if (dev == sb.st_rdev) { 618 closedir(dfd); 619 if ((dp = strdup(devname)) == NULL) { 620 syslog(LOG_ERR, "%m"); 621 exit(1); 622 } 623 return (dp); 624 } 625 } 626 closedir(dfd); 627 syslog(LOG_ERR, "can't find device %d/%d", major(dev), minor(dev)); 628 exit(1); 629} 630 631char * 632rawname(char *s) 633{ 634 char *sl; 635 char name[MAXPATHLEN]; 636 637 if ((sl = strrchr(s, '/')) == NULL || sl[1] == '0') { 638 syslog(LOG_ERR, 639 "can't make raw dump device name from %s", s); 640 return (s); 641 } 642 (void)snprintf(name, sizeof(name), "%.*s/r%s", (int)(sl - s), s, 643 sl + 1); 644 if ((sl = strdup(name)) == NULL) { 645 syslog(LOG_ERR, "%m"); 646 exit(1); 647 } 648 return (sl); 649} 650 651int 652get_crashtime(void) 653{ 654 struct timeval dtime; 655 time_t dumptime; /* Time the dump was taken. */ 656 657 if (KREAD(kd_dump, dump_nl[X_TIME].n_value, &dtime) != 0) { 658 if (verbose) 659 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 660 return (0); 661 } 662 dumptime = dtime.tv_sec; 663 if (dumptime == 0) { 664 if (verbose) 665 syslog(LOG_ERR, "dump time is zero"); 666 return (0); 667 } 668 (void)printf("savecore: system went down at %s", ctime(&dumptime)); 669#define LEEWAY (7 * SECSPERDAY) 670 if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) { 671 (void)printf("dump time is unreasonable\n"); 672 return (0); 673 } 674 return (1); 675} 676 677int 678check_space(void) 679{ 680 FILE *fp; 681 off_t minfree, spacefree, kernelsize, needed; 682 struct stat st; 683 struct statfs fsbuf; 684 char mbuf[100], path[MAXPATHLEN]; 685 686#ifdef __GNUC__ 687 (void) &minfree; 688#endif 689 690 if (stat(kernel, &st) < 0) { 691 syslog(LOG_ERR, "%s: %m", kernel); 692 exit(1); 693 } 694 kernelsize = st.st_blocks * S_BLKSIZE; 695 if (statfs(dirname, &fsbuf) < 0) { 696 syslog(LOG_ERR, "%s: %m", dirname); 697 exit(1); 698 } 699 spacefree = fsbuf.f_bavail; 700 spacefree *= fsbuf.f_bsize; 701 spacefree /= 1024; 702 703 (void)snprintf(path, sizeof(path), "%s/minfree", dirname); 704 if ((fp = fopen(path, "r")) == NULL) 705 minfree = 0; 706 else { 707 if (fgets(mbuf, sizeof(mbuf), fp) == NULL) 708 minfree = 0; 709 else 710 minfree = atoi(mbuf); 711 (void)fclose(fp); 712 } 713 714 needed = (dumpsize + kernelsize) / 1024; 715 if (minfree > 0 && spacefree - needed < minfree) { 716 syslog(LOG_WARNING, 717 "no dump, not enough free space in %s", dirname); 718 return (0); 719 } 720 if (spacefree - needed < minfree) 721 syslog(LOG_WARNING, 722 "dump performed, but free space threshold crossed"); 723 return (1); 724} 725 726int 727Open(const char *name, int rw) 728{ 729 int fd; 730 731 if ((fd = open(name, rw, 0)) < 0) { 732 syslog(LOG_ERR, "%s: %m", name); 733 exit(1); 734 } 735 return (fd); 736} 737 738void 739Lseek(int fd, off_t off, int flag) 740{ 741 off_t ret; 742 743 ret = lseek(fd, off, flag); 744 if (ret == -1) { 745 syslog(LOG_ERR, "lseek: %m"); 746 exit(1); 747 } 748} 749 750int 751Create(char *file, int mode) 752{ 753 int fd; 754 755 fd = open(file, O_WRONLY | O_CREAT | O_TRUNC, mode); 756 if (fd < 0) { 757 syslog(LOG_ERR, "%s: %m", file); 758 exit(1); 759 } 760 return (fd); 761} 762 763void 764Write(int fd, void *bp, int size) 765{ 766 int n; 767 768 if ((n = write(fd, bp, size)) < size) { 769 syslog(LOG_ERR, "write: %s", strerror(n == -1 ? errno : EIO)); 770 exit(1); 771 } 772} 773 774void 775usage(void) 776{ 777 (void)syslog(LOG_ERR, "usage: savecore [-cfvz] [-N system] directory"); 778 exit(1); 779} 780