savecore.c revision 1.42
1/* $NetBSD: savecore.c,v 1.42 2000/10/01 02:27:06 darrenr 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 1.42 2000/10/01 02:27:06 darrenr Exp $"); 47#endif 48#endif /* not lint */ 49 50#include <sys/param.h> 51#include <sys/stat.h> 52#include <sys/mount.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 <stdio.h> 62#include <stdlib.h> 63#include <string.h> 64#include <time.h> 65#include <tzfile.h> 66#include <unistd.h> 67#include <limits.h> 68#include <kvm.h> 69 70extern FILE *zopen __P((const char *fname, const char *mode, int bits)); 71 72#define KREAD(kd, addr, p)\ 73 (kvm_read(kd, addr, (char *)(p), sizeof(*(p))) != sizeof(*(p))) 74 75struct nlist current_nl[] = { /* Namelist for currently running system. */ 76#define X_DUMPDEV 0 77 { "_dumpdev" }, 78#define X_DUMPLO 1 79 { "_dumplo" }, 80#define X_TIME 2 81 { "_time" }, 82#define X_DUMPSIZE 3 83 { "_dumpsize" }, 84#define X_VERSION 4 85 { "_version" }, 86#define X_PANICSTR 5 87 { "_panicstr" }, 88#define X_DUMPMAG 6 89 { "_dumpmag" }, 90 { NULL }, 91}; 92int cursyms[] = { X_DUMPDEV, X_DUMPLO, X_VERSION, X_DUMPMAG, -1 }; 93int dumpsyms[] = { X_TIME, X_DUMPSIZE, X_VERSION, X_PANICSTR, X_DUMPMAG, -1 }; 94 95struct nlist dump_nl[] = { /* Name list for dumped system. */ 96 { "_dumpdev" }, /* Entries MUST be the same as */ 97 { "_dumplo" }, /* those in current_nl[]. */ 98 { "_time" }, 99 { "_dumpsize" }, 100 { "_version" }, 101 { "_panicstr" }, 102 { "_dumpmag" }, 103 { NULL }, 104}; 105 106/* Types match kernel declarations. */ 107long dumplo; /* where dump starts on dumpdev */ 108int dumpmag; /* magic number in dump */ 109int dumpsize; /* amount of memory dumped */ 110 111char *kernel; 112char *dirname; /* directory to save dumps in */ 113char *ddname; /* name of dump device */ 114dev_t dumpdev; /* dump device */ 115int dumpfd; /* read/write descriptor on block dev */ 116kvm_t *kd_dump; /* kvm descriptor on block dev */ 117time_t now; /* current date */ 118char panic_mesg[1024]; 119long panicstr; 120char vers[1024]; 121 122int clear, compress, force, verbose; /* flags */ 123 124void check_kmem __P((void)); 125int check_space __P((void)); 126void clear_dump __P((void)); 127int Create __P((char *, int)); 128int dump_exists __P((void)); 129char *find_dev __P((dev_t, int)); 130int get_crashtime __P((void)); 131void kmem_setup __P((void)); 132void log __P((int, char *, ...)); 133void Lseek __P((int, off_t, int)); 134int main __P((int, char *[])); 135int Open __P((char *, int rw)); 136char *rawname __P((char *s)); 137void save_core __P((void)); 138void usage __P((void)); 139void Write __P((int, void *, int)); 140 141int 142main(argc, argv) 143 int argc; 144 char *argv[]; 145{ 146 int ch; 147 148 openlog("savecore", LOG_PERROR, LOG_DAEMON); 149 150 while ((ch = getopt(argc, argv, "cdfN:vz")) != -1) 151 switch(ch) { 152 case 'c': 153 clear = 1; 154 break; 155 case 'd': /* Not documented. */ 156 case 'v': 157 verbose = 1; 158 break; 159 case 'f': 160 force = 1; 161 break; 162 case 'N': 163 kernel = optarg; 164 break; 165 case 'z': 166 compress = 1; 167 break; 168 case '?': 169 default: 170 usage(); 171 } 172 argc -= optind; 173 argv += optind; 174 175 if (!clear) { 176 if (argc != 1 && argc != 2) 177 usage(); 178 dirname = argv[0]; 179 } 180 if (argc == 2) 181 kernel = argv[1]; 182 183 (void)time(&now); 184 kmem_setup(); 185 186 if (clear) { 187 clear_dump(); 188 exit(0); 189 } 190 191 if (!dump_exists() && !force) 192 exit(1); 193 194 check_kmem(); 195 196 if (panicstr) 197 syslog(LOG_ALERT, "reboot after panic: %s", panic_mesg); 198 else 199 syslog(LOG_ALERT, "reboot"); 200 201 if ((!get_crashtime() || !check_space()) && !force) 202 exit(1); 203 204 save_core(); 205 206 clear_dump(); 207 exit(0); 208} 209 210void 211kmem_setup() 212{ 213 kvm_t *kd_kern; 214 char errbuf[_POSIX2_LINE_MAX]; 215 int i, hdrsz; 216 char *dump_sys; 217 218 /* 219 * Some names we need for the currently running system, others for 220 * the system that was running when the dump was made. The values 221 * obtained from the current system are used to look for things in 222 * /dev/kmem that cannot be found in the dump_sys namelist, but are 223 * presumed to be the same (since the disk partitions are probably 224 * the same!) 225 */ 226 kd_kern = kvm_openfiles(kernel, NULL, NULL, O_RDONLY, errbuf); 227 if (kd_kern == NULL) { 228 syslog(LOG_ERR, "%s: kvm_openfiles: %s", _PATH_UNIX, errbuf); 229 exit(1); 230 } 231 if (kvm_nlist(kd_kern, current_nl) == -1) 232 syslog(LOG_ERR, "%s: kvm_nlist: %s", _PATH_UNIX, 233 kvm_geterr(kd_kern)); 234 235 for (i = 0; cursyms[i] != -1; i++) 236 if (current_nl[cursyms[i]].n_value == 0) { 237 syslog(LOG_ERR, "%s: %s not in namelist", 238 _PATH_UNIX, current_nl[cursyms[i]].n_name); 239 exit(1); 240 } 241 242 if (KREAD(kd_kern, current_nl[X_DUMPDEV].n_value, &dumpdev) != 0) { 243 if (verbose) 244 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 245 exit(1); 246 } 247 if (dumpdev == NODEV) { 248 syslog(LOG_WARNING, "no core dump (no dumpdev)"); 249 exit(1); 250 } 251 if (KREAD(kd_kern, current_nl[X_DUMPLO].n_value, &dumplo) != 0) { 252 if (verbose) 253 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 254 exit(1); 255 } 256 dumplo *= DEV_BSIZE; 257 if (verbose) 258 (void)printf("dumplo = %ld (%ld * %ld)\n", 259 (long)dumplo, (long)(dumplo / DEV_BSIZE), (long)DEV_BSIZE); 260 if (KREAD(kd_kern, current_nl[X_DUMPMAG].n_value, &dumpmag) != 0) { 261 if (verbose) 262 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 263 exit(1); 264 } 265 266 if (kernel == NULL) { 267 (void)kvm_read(kd_kern, current_nl[X_VERSION].n_value, 268 vers, sizeof(vers)); 269 vers[sizeof(vers) - 1] = '\0'; 270 } 271 272 ddname = find_dev(dumpdev, S_IFBLK); 273 dumpfd = Open(ddname, O_RDWR); 274 275 dump_sys = kernel ? kernel : _PATH_UNIX; 276 277 kd_dump = kvm_openfiles(dump_sys, ddname, NULL, O_RDWR, errbuf); 278 if (kd_dump == NULL) { 279 syslog(LOG_ERR, "%s: kvm_openfiles: %s", dump_sys, errbuf); 280 exit(1); 281 } 282 283 if (kvm_nlist(kd_dump, dump_nl) == -1) 284 syslog(LOG_ERR, "%s: kvm_nlist: %s", dump_sys, 285 kvm_geterr(kd_dump)); 286 287 for (i = 0; dumpsyms[i] != -1; i++) 288 if (dump_nl[dumpsyms[i]].n_value == 0) { 289 syslog(LOG_ERR, "%s: %s not in namelist", 290 dump_sys, dump_nl[dumpsyms[i]].n_name); 291 exit(1); 292 } 293 hdrsz = kvm_dump_mkheader(kd_dump, (off_t)dumplo); 294 295 /* 296 * If 'hdrsz' == 0, kvm_dump_mkheader() failed on the magic-number 297 * checks, ergo no dump is present... 298 */ 299 if (hdrsz == 0) { 300 syslog(LOG_WARNING, "no core dump"); 301 exit(1); 302 } 303 if (hdrsz == -1) { 304 syslog(LOG_ERR, "%s: kvm_dump_mkheader: %s", dump_sys, 305 kvm_geterr(kd_dump)); 306 exit(1); 307 } 308 dumplo += hdrsz; 309 kvm_close(kd_kern); 310} 311 312void 313check_kmem() 314{ 315 char *cp; 316 long panicloc; 317 char core_vers[1024]; 318 319 (void)kvm_read(kd_dump, dump_nl[X_VERSION].n_value, core_vers, 320 sizeof(core_vers)); 321 core_vers[sizeof(core_vers) - 1] = '\0'; 322 323 if (strcmp(vers, core_vers) && kernel == 0) 324 syslog(LOG_WARNING, 325 "warning: %s version mismatch:\n\t%s\nand\t%s\n", 326 _PATH_UNIX, vers, core_vers); 327 328 if (KREAD(kd_dump, dump_nl[X_PANICSTR].n_value, &panicstr) != 0) { 329 if (verbose) 330 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 331 return; 332 } 333 if (panicstr) { 334 cp = panic_mesg; 335 panicloc = panicstr; 336 do { 337 if (KREAD(kd_dump, panicloc, cp) != 0) { 338 if (verbose) 339 syslog(LOG_WARNING, "kvm_read: %s", 340 kvm_geterr(kd_dump)); 341 break; 342 } 343 panicloc++; 344 } while (*cp++ && cp < &panic_mesg[sizeof(panic_mesg)-1]); 345 panic_mesg[sizeof(panic_mesg) - 1] = '\0'; 346 } 347} 348 349int 350dump_exists() 351{ 352 int newdumpmag; 353 354 if (KREAD(kd_dump, dump_nl[X_DUMPMAG].n_value, &newdumpmag) != 0) { 355 if (verbose) 356 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 357 return (0); 358 } 359 360 /* Read the dump size. */ 361 if (KREAD(kd_dump, dump_nl[X_DUMPSIZE].n_value, &dumpsize) != 0) { 362 if (verbose) 363 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 364 return (0); 365 } 366 dumpsize *= getpagesize(); 367 368 /* 369 * Return zero if core dump doesn't seem to be there, and note 370 * it for syslog. This check and return happens after the dump size 371 * is read, so dumpsize is whether or not the core is valid (for -f). 372 */ 373 if (newdumpmag != dumpmag) { 374 if (verbose) 375 syslog(LOG_WARNING, 376 "magic number mismatch (0x%x != 0x%x)", 377 newdumpmag, dumpmag); 378 syslog(LOG_WARNING, "no core dump"); 379 return (0); 380 } 381 return (1); 382} 383 384void 385clear_dump() 386{ 387 if (kvm_dump_inval(kd_dump) == -1) 388 syslog(LOG_ERR, "%s: kvm_clear_dump: %s", ddname, 389 kvm_geterr(kd_dump)); 390 391} 392 393char buf[1024 * 1024]; 394 395void 396save_core() 397{ 398 FILE *fp; 399 int bounds, ifd, nr, nw, ofd; 400 char *rawp, path[MAXPATHLEN]; 401 402 ofd = -1; 403 /* 404 * Get the current number and update the bounds file. Do the update 405 * now, because may fail later and don't want to overwrite anything. 406 */ 407 umask(066); 408 (void)snprintf(path, sizeof(path), "%s/bounds", dirname); 409 if ((fp = fopen(path, "r")) == NULL) 410 goto err1; 411 if (fgets(buf, sizeof(buf), fp) == NULL) { 412 if (ferror(fp)) 413err1: syslog(LOG_WARNING, "%s: %s", path, strerror(errno)); 414 bounds = 0; 415 } else 416 bounds = atoi(buf); 417 if (fp != NULL) 418 (void)fclose(fp); 419 if ((fp = fopen(path, "w")) == NULL) 420 syslog(LOG_ERR, "%s: %m", path); 421 else { 422 (void)fprintf(fp, "%d\n", bounds + 1); 423 (void)fclose(fp); 424 } 425 426 /* Create the core file. */ 427 (void)snprintf(path, sizeof(path), "%s/netbsd.%d.core%s", 428 dirname, bounds, compress ? ".Z" : ""); 429 if (compress) { 430 if ((fp = zopen(path, "w", 0)) == NULL) { 431 syslog(LOG_ERR, "%s: %s", path, strerror(errno)); 432 exit(1); 433 } 434 } else { 435 ofd = Create(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); 436 fp = fdopen(ofd, "w"); 437 if (fp == NULL) { 438 syslog(LOG_ERR, "%s: fdopen: %s", path, 439 strerror(errno)); 440 exit(1); 441 } 442 } 443 444 /* Open the raw device. */ 445 rawp = rawname(ddname); 446 if ((ifd = open(rawp, O_RDONLY)) == -1) { 447 syslog(LOG_WARNING, "%s: %m; using block device", rawp); 448 ifd = dumpfd; 449 } 450 451 /* Seek to the start of the core. */ 452 Lseek(ifd, (off_t)dumplo, SEEK_SET); 453 454 if (kvm_dump_wrtheader(kd_dump, fp, dumpsize) == -1) { 455 syslog(LOG_ERR, "kvm_dump_wrtheader: %s : %s", path, 456 kvm_geterr(kd_dump)); 457 exit(1); 458 } 459 460 /* Copy the core file. */ 461 syslog(LOG_NOTICE, "writing %score to %s", 462 compress ? "compressed " : "", path); 463 for (; dumpsize > 0; dumpsize -= nr) { 464 (void)printf("%6dK\r", dumpsize / 1024); 465 (void)fflush(stdout); 466 nr = read(ifd, buf, MIN(dumpsize, sizeof(buf))); 467 if (nr <= 0) { 468 if (nr == 0) 469 syslog(LOG_WARNING, 470 "WARNING: EOF on dump device"); 471 else 472 syslog(LOG_ERR, "%s: %m", rawp); 473 goto err2; 474 } 475 nw = fwrite(buf, 1, nr, fp); 476 if (nw != nr) { 477 syslog(LOG_ERR, "%s: %s", 478 path, strerror(nw == 0 ? EIO : errno)); 479err2: syslog(LOG_WARNING, 480 "WARNING: core may be incomplete"); 481 (void)printf("\n"); 482 exit(1); 483 } 484 } 485 (void)close(ifd); 486 (void)fclose(fp); 487 488 /* Copy the kernel. */ 489 ifd = Open(kernel ? kernel : _PATH_UNIX, O_RDONLY); 490 (void)snprintf(path, sizeof(path), "%s/netbsd.%d%s", 491 dirname, bounds, compress ? ".Z" : ""); 492 if (compress) { 493 if ((fp = zopen(path, "w", 0)) == NULL) { 494 syslog(LOG_ERR, "%s: %s", path, strerror(errno)); 495 exit(1); 496 } 497 } else 498 ofd = Create(path, S_IRUSR | S_IWUSR); 499 syslog(LOG_NOTICE, "writing %skernel to %s", 500 compress ? "compressed " : "", path); 501 while ((nr = read(ifd, buf, sizeof(buf))) > 0) { 502 if (compress) 503 nw = fwrite(buf, 1, nr, fp); 504 else 505 nw = write(ofd, buf, nr); 506 if (nw != nr) { 507 syslog(LOG_ERR, "%s: %s", 508 path, strerror(nw == 0 ? EIO : errno)); 509 syslog(LOG_WARNING, 510 "WARNING: kernel may be incomplete"); 511 exit(1); 512 } 513 } 514 if (nr < 0) { 515 syslog(LOG_ERR, "%s: %s", 516 kernel ? kernel : _PATH_UNIX, strerror(errno)); 517 syslog(LOG_WARNING, 518 "WARNING: kernel may be incomplete"); 519 exit(1); 520 } 521 if (compress) 522 (void)fclose(fp); 523 else 524 (void)close(ofd); 525} 526 527char * 528find_dev(dev, type) 529 dev_t dev; 530 int type; 531{ 532 DIR *dfd; 533 struct dirent *dir; 534 struct stat sb; 535 char *dp, devname[MAXPATHLEN + 1]; 536 537 if ((dfd = opendir(_PATH_DEV)) == NULL) { 538 syslog(LOG_ERR, "%s: %s", _PATH_DEV, strerror(errno)); 539 exit(1); 540 } 541 (void)strcpy(devname, _PATH_DEV); 542 while ((dir = readdir(dfd))) { 543 (void)strcpy(devname + sizeof(_PATH_DEV) - 1, dir->d_name); 544 if (lstat(devname, &sb)) { 545 syslog(LOG_ERR, "%s: %s", devname, strerror(errno)); 546 continue; 547 } 548 if ((sb.st_mode & S_IFMT) != type) 549 continue; 550 if (dev == sb.st_rdev) { 551 closedir(dfd); 552 if ((dp = strdup(devname)) == NULL) { 553 syslog(LOG_ERR, "%s", strerror(errno)); 554 exit(1); 555 } 556 return (dp); 557 } 558 } 559 closedir(dfd); 560 syslog(LOG_ERR, "can't find device %d/%d", major(dev), minor(dev)); 561 exit(1); 562} 563 564char * 565rawname(s) 566 char *s; 567{ 568 char *sl, name[MAXPATHLEN]; 569 570 if ((sl = strrchr(s, '/')) == NULL || sl[1] == '0') { 571 syslog(LOG_ERR, 572 "can't make raw dump device name from %s", s); 573 return (s); 574 } 575 (void)snprintf(name, sizeof(name), "%.*s/r%s", (int)(sl - s), s, 576 sl + 1); 577 if ((sl = strdup(name)) == NULL) { 578 syslog(LOG_ERR, "%s", strerror(errno)); 579 exit(1); 580 } 581 return (sl); 582} 583 584int 585get_crashtime() 586{ 587 struct timeval time; 588 time_t dumptime; /* Time the dump was taken. */ 589 590 if (KREAD(kd_dump, dump_nl[X_TIME].n_value, &time) != 0) { 591 if (verbose) 592 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 593 return (0); 594 } 595 dumptime = time.tv_sec; 596 if (dumptime == 0) { 597 if (verbose) 598 syslog(LOG_ERR, "dump time is zero"); 599 return (0); 600 } 601 (void)printf("savecore: system went down at %s", ctime(&dumptime)); 602#define LEEWAY (7 * SECSPERDAY) 603 if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) { 604 (void)printf("dump time is unreasonable\n"); 605 return (0); 606 } 607 return (1); 608} 609 610int 611check_space() 612{ 613 FILE *fp; 614 char *tkernel; 615 off_t minfree, spacefree, kernelsize, needed; 616 struct stat st; 617 struct statfs fsbuf; 618 char buf[100], path[MAXPATHLEN]; 619 620#ifdef __GNUC__ 621 (void) &minfree; 622#endif 623 624 tkernel = kernel ? kernel : _PATH_UNIX; 625 if (stat(tkernel, &st) < 0) { 626 syslog(LOG_ERR, "%s: %m", tkernel); 627 exit(1); 628 } 629 kernelsize = st.st_blocks * S_BLKSIZE; 630 if (statfs(dirname, &fsbuf) < 0) { 631 syslog(LOG_ERR, "%s: %m", dirname); 632 exit(1); 633 } 634 spacefree = fsbuf.f_bavail; 635 spacefree *= fsbuf.f_bsize; 636 spacefree /= 1024; 637 638 (void)snprintf(path, sizeof(path), "%s/minfree", dirname); 639 if ((fp = fopen(path, "r")) == NULL) 640 minfree = 0; 641 else { 642 if (fgets(buf, sizeof(buf), fp) == NULL) 643 minfree = 0; 644 else 645 minfree = atoi(buf); 646 (void)fclose(fp); 647 } 648 649 needed = (dumpsize + kernelsize) / 1024; 650 if (minfree > 0 && spacefree - needed < minfree) { 651 syslog(LOG_WARNING, 652 "no dump, not enough free space in %s", dirname); 653 return (0); 654 } 655 if (spacefree - needed < minfree) 656 syslog(LOG_WARNING, 657 "dump performed, but free space threshold crossed"); 658 return (1); 659} 660 661int 662Open(name, rw) 663 char *name; 664 int rw; 665{ 666 int fd; 667 668 if ((fd = open(name, rw, 0)) < 0) { 669 syslog(LOG_ERR, "%s: %m", name); 670 exit(1); 671 } 672 return (fd); 673} 674 675void 676Lseek(fd, off, flag) 677 int fd, flag; 678 off_t off; 679{ 680 off_t ret; 681 682 ret = lseek(fd, off, flag); 683 if (ret == -1) { 684 syslog(LOG_ERR, "lseek: %m"); 685 exit(1); 686 } 687} 688 689int 690Create(file, mode) 691 char *file; 692 int mode; 693{ 694 int fd; 695 696 fd = open(file, O_WRONLY | O_CREAT | O_TRUNC, mode); 697 if (fd < 0) { 698 syslog(LOG_ERR, "%s: %m", file); 699 exit(1); 700 } 701 return (fd); 702} 703 704void 705Write(fd, bp, size) 706 int fd, size; 707 void *bp; 708{ 709 int n; 710 711 if ((n = write(fd, bp, size)) < size) { 712 syslog(LOG_ERR, "write: %s", strerror(n == -1 ? errno : EIO)); 713 exit(1); 714 } 715} 716 717void 718usage() 719{ 720 (void)syslog(LOG_ERR, "usage: savecore [-cfvz] [-N system] directory"); 721 exit(1); 722} 723