1 /*- 2 * Copyright (c) 1986, 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1986, 1992, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)savecore.c 8.3 (Berkeley) 1/2/94"; 43 #endif 44 static const char rcsid[] = 45 "$FreeBSD$"; 46 #endif /* not lint */ 47 48 #include <sys/param.h> 49 #include <sys/stat.h> 50 #include <sys/mount.h> 51 #include <sys/syslog.h> 52 #include <sys/sysctl.h> 53 54 #include <vm/vm.h> 55 #include <vm/vm_param.h> 56 #include <vm/pmap.h> 57 58 #include <dirent.h> 59 #include <errno.h> 60 #include <fcntl.h> 61 #include <nlist.h> 62 #include <paths.h> 63 #include <stdio.h> 64 #include <stdlib.h> 65 #include <string.h> 66 #include <unistd.h> 67 #include "zopen.h" 68 69 #ifdef __alpha__ 70 #define ok(number) ALPHA_K0SEG_TO_PHYS(number) 71 #endif 72 73 #ifdef __i386__ 74 #define ok(number) ((number) - KERNBASE) 75 #endif 76 77 struct nlist current_nl[] = { /* Namelist for currently running system. */ 78 #define X_DUMPLO 0 79 { "_dumplo" }, 80 #define X_TIME 1 81 { "_time_second" }, 82 #define X_DUMPSIZE 2 83 { "_dumpsize" }, 84 #define X_VERSION 3 85 { "_version" }, 86 #define X_PANICSTR 4 87 { "_panicstr" }, 88 #define X_DUMPMAG 5 89 { "_dumpmag" }, 90 { "" }, 91 }; 92 int cursyms[] = { X_DUMPLO, X_VERSION, X_DUMPMAG, -1 }; 93 int dumpsyms[] = { X_TIME, X_DUMPSIZE, X_VERSION, X_PANICSTR, X_DUMPMAG, -1 }; 94 95 struct nlist dump_nl[] = { /* Name list for dumped system. */ 96 { "_dumplo" }, /* Entries MUST be the same as */ 97 { "_time_second" }, /* those in current_nl[]. */ 98 { "_dumpsize" }, 99 { "_version" }, 100 { "_panicstr" }, 101 { "_dumpmag" }, 102 { "" }, 103 }; 104 105 /* Types match kernel declarations. */ 106 off_t dumplo; /* where dump starts on dumpdev */ 107 int dumpmag; /* magic number in dump */ 108 int dumpsize; /* amount of memory dumped */ 109 110 char *kernel; 111 char *dirname; /* directory to save dumps in */ 112 char *ddname; /* name of dump device */ 113 dev_t dumpdev; /* dump device */ 114 int dumpfd; /* read/write descriptor on char dev */ 115 time_t now; /* current date */ 116 char panic_mesg[1024]; 117 int panicstr; 118 char vers[1024]; 119 120 int clear, compress, force, verbose; /* flags */ 121 122 void check_kmem __P((void)); 123 int check_space __P((void)); 124 void clear_dump __P((void)); 125 int Create __P((char *, int)); 126 void DumpRead __P((int fd, void *bp, int size, off_t off, int flag)); 127 void DumpWrite __P((int fd, void *bp, int size, off_t off, int flag)); 128 int dump_exists __P((void)); 129 char *find_dev __P((dev_t)); 130 int get_crashtime __P((void)); 131 void get_dumpsize __P((void)); 132 void kmem_setup __P((void)); 133 void log __P((int, char *, ...)); 134 void Lseek __P((int, off_t, int)); 135 int Open __P((const char *, int rw)); 136 int Read __P((int, void *, int)); 137 void save_core __P((void)); 138 void usage __P((void)); 139 void Write __P((int, void *, int)); 140 141 int 142 main(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 get_dumpsize(); 202 203 if ((!get_crashtime() || !check_space()) && !force) 204 exit(1); 205 206 save_core(); 207 208 clear_dump(); 209 exit(0); 210 } 211 212 void 213 kmem_setup() 214 { 215 FILE *fp; 216 int kmem, i; 217 const char *dump_sys; 218 int mib[2]; 219 size_t len; 220 long kdumplo; /* block number where dump starts on dumpdev */ 221 222 /* 223 * Some names we need for the currently running system, others for 224 * the system that was running when the dump was made. The values 225 * obtained from the current system are used to look for things in 226 * /dev/kmem that cannot be found in the dump_sys namelist, but are 227 * presumed to be the same (since the disk partitions are probably 228 * the same!) 229 */ 230 if ((nlist(getbootfile(), current_nl)) == -1) 231 syslog(LOG_ERR, "%s: nlist: %s", getbootfile(), 232 strerror(errno)); 233 for (i = 0; cursyms[i] != -1; i++) 234 if (current_nl[cursyms[i]].n_value == 0) { 235 syslog(LOG_ERR, "%s: %s not in namelist", 236 getbootfile(), current_nl[cursyms[i]].n_name); 237 exit(1); 238 } 239 240 dump_sys = kernel ? kernel : getbootfile(); 241 if ((nlist(dump_sys, dump_nl)) == -1) 242 syslog(LOG_ERR, "%s: nlist: %s", dump_sys, strerror(errno)); 243 for (i = 0; dumpsyms[i] != -1; i++) 244 if (dump_nl[dumpsyms[i]].n_value == 0) { 245 syslog(LOG_ERR, "%s: %s not in namelist", 246 dump_sys, dump_nl[dumpsyms[i]].n_name); 247 exit(1); 248 } 249 250 mib[0] = CTL_KERN; 251 mib[1] = KERN_DUMPDEV; 252 len = sizeof dumpdev; 253 if (sysctl(mib, 2, &dumpdev, &len, NULL, 0) == -1) { 254 syslog(LOG_ERR, "sysctl: kern.dumpdev: %m"); 255 exit(1); 256 } 257 if (dumpdev == NODEV) { 258 syslog(LOG_WARNING, "no core dump (no dumpdev)"); 259 exit(1); 260 } 261 262 kmem = Open(_PATH_KMEM, O_RDONLY); 263 Lseek(kmem, (off_t)current_nl[X_DUMPLO].n_value, L_SET); 264 (void)Read(kmem, &kdumplo, sizeof(kdumplo)); 265 dumplo = (off_t)kdumplo * DEV_BSIZE; 266 if (verbose) 267 (void)printf("dumplo = %lld (%ld * %d)\n", 268 (long long)dumplo, kdumplo, DEV_BSIZE); 269 Lseek(kmem, (off_t)current_nl[X_DUMPMAG].n_value, L_SET); 270 (void)Read(kmem, &dumpmag, sizeof(dumpmag)); 271 ddname = find_dev(dumpdev); 272 dumpfd = Open(ddname, O_RDWR); 273 fp = fdopen(kmem, "r"); 274 if (fp == NULL) { 275 syslog(LOG_ERR, "%s: fdopen: %m", _PATH_KMEM); 276 exit(1); 277 } 278 if (kernel) 279 return; 280 (void)fseek(fp, (off_t)current_nl[X_VERSION].n_value, L_SET); 281 (void)fgets(vers, sizeof(vers), fp); 282 283 /* Don't fclose(fp), we use dumpfd later. */ 284 } 285 286 void 287 check_kmem() 288 { 289 char core_vers[1024], *p; 290 291 DumpRead(dumpfd, core_vers, sizeof(core_vers), 292 (off_t)(dumplo + ok(dump_nl[X_VERSION].n_value)), L_SET); 293 core_vers[sizeof(core_vers) - 1] = '\0'; 294 p = strchr(core_vers, '\n'); 295 if (p) 296 p[1] = '\0'; 297 if (strcmp(vers, core_vers) && kernel == 0) 298 syslog(LOG_WARNING, 299 "warning: %s version mismatch:\n\t\"%s\"\nand\t\"%s\"\n", 300 getbootfile(), vers, core_vers); 301 DumpRead(dumpfd, &panicstr, sizeof(panicstr), 302 (off_t)(dumplo + ok(dump_nl[X_PANICSTR].n_value)), L_SET); 303 if (panicstr) { 304 DumpRead(dumpfd, panic_mesg, sizeof(panic_mesg), 305 (off_t)(dumplo + ok(panicstr)), L_SET); 306 } 307 } 308 309 void 310 clear_dump() 311 { 312 long newdumplo; 313 314 newdumplo = 0; 315 DumpWrite(dumpfd, &newdumplo, sizeof(newdumplo), 316 (off_t)(dumplo + ok(dump_nl[X_DUMPMAG].n_value)), L_SET); 317 close(dumpfd); 318 } 319 320 int 321 dump_exists() 322 { 323 int newdumpmag; 324 325 DumpRead(dumpfd, &newdumpmag, sizeof(newdumpmag), 326 (off_t)(dumplo + ok(dump_nl[X_DUMPMAG].n_value)), L_SET); 327 if (newdumpmag != dumpmag) { 328 if (verbose) 329 syslog(LOG_WARNING, "magic number mismatch (%x != %x)", 330 newdumpmag, dumpmag); 331 syslog(LOG_WARNING, "no core dump"); 332 return (0); 333 } 334 return (1); 335 } 336 337 char buf[1024 * 1024]; 338 339 void 340 save_core() 341 { 342 register FILE *fp; 343 register int bounds, ifd, nr, nw, ofd; 344 char path[MAXPATHLEN]; 345 mode_t oumask; 346 347 /* 348 * Get the current number and update the bounds file. Do the update 349 * now, because may fail later and don't want to overwrite anything. 350 */ 351 (void)snprintf(path, sizeof(path), "%s/bounds", dirname); 352 if ((fp = fopen(path, "r")) == NULL) 353 goto err1; 354 if (fgets(buf, sizeof(buf), fp) == NULL) { 355 if (ferror(fp)) 356 err1: syslog(LOG_WARNING, "%s: %s", path, strerror(errno)); 357 bounds = 0; 358 } else 359 bounds = atoi(buf); 360 if (fp != NULL) 361 (void)fclose(fp); 362 if ((fp = fopen(path, "w")) == NULL) 363 syslog(LOG_ERR, "%s: %m", path); 364 else { 365 (void)fprintf(fp, "%d\n", bounds + 1); 366 (void)fclose(fp); 367 } 368 369 /* Create the core file. */ 370 oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/ 371 (void)snprintf(path, sizeof(path), "%s/vmcore.%d%s", 372 dirname, bounds, compress ? ".Z" : ""); 373 if (compress) { 374 if ((fp = zopen(path, "w", 0)) == NULL) { 375 syslog(LOG_ERR, "%s: %s", path, strerror(errno)); 376 exit(1); 377 } 378 ofd = -1; /* Not actually used. */ 379 } else 380 ofd = Create(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); 381 (void)umask(oumask); 382 383 /* Seek to the start of the core. */ 384 Lseek(dumpfd, (off_t)dumplo, L_SET); 385 386 /* Copy the core file. */ 387 syslog(LOG_NOTICE, "writing %score to %s", 388 compress ? "compressed " : "", path); 389 for (; dumpsize > 0; dumpsize -= nr) { 390 (void)printf("%6dK\r", dumpsize / 1024); 391 (void)fflush(stdout); 392 nr = read(dumpfd, buf, MIN(dumpsize, sizeof(buf))); 393 if (nr <= 0) { 394 if (nr == 0) 395 syslog(LOG_WARNING, 396 "WARNING: EOF on dump device"); 397 else 398 syslog(LOG_ERR, "%s: %m", ddname); 399 goto err2; 400 } 401 if (compress) 402 nw = fwrite(buf, 1, nr, fp); 403 else 404 nw = write(ofd, buf, nr); 405 if (nw != nr) { 406 syslog(LOG_ERR, "%s: %s", 407 path, strerror(nw == 0 ? EIO : errno)); 408 err2: syslog(LOG_WARNING, 409 "WARNING: vmcore may be incomplete"); 410 (void)printf("\n"); 411 exit(1); 412 } 413 } 414 415 if (compress) 416 (void)fclose(fp); 417 else 418 (void)close(ofd); 419 420 /* Copy the kernel. */ 421 ifd = Open(kernel ? kernel : getbootfile(), O_RDONLY); 422 (void)snprintf(path, sizeof(path), "%s/kernel.%d%s", 423 dirname, bounds, compress ? ".Z" : ""); 424 if (compress) { 425 if ((fp = zopen(path, "w", 0)) == NULL) { 426 syslog(LOG_ERR, "%s: %s", path, strerror(errno)); 427 exit(1); 428 } 429 } else 430 ofd = Create(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); 431 syslog(LOG_NOTICE, "writing %skernel to %s", 432 compress ? "compressed " : "", path); 433 while ((nr = read(ifd, buf, sizeof(buf))) > 0) { 434 if (compress) 435 nw = fwrite(buf, 1, nr, fp); 436 else 437 nw = write(ofd, buf, nr); 438 if (nw != nr) { 439 syslog(LOG_ERR, "%s: %s", 440 path, strerror(nw == 0 ? EIO : errno)); 441 syslog(LOG_WARNING, 442 "WARNING: kernel may be incomplete"); 443 exit(1); 444 } 445 } 446 if (nr < 0) { 447 syslog(LOG_ERR, "%s: %s", 448 kernel ? kernel : getbootfile(), strerror(errno)); 449 syslog(LOG_WARNING, 450 "WARNING: kernel may be incomplete"); 451 exit(1); 452 } 453 if (compress) 454 (void)fclose(fp); 455 else 456 (void)close(ofd); 457 close(ifd); 458 } 459 460 char * 461 find_dev(dev) 462 register dev_t dev; 463 { 464 register DIR *dfd; 465 struct dirent *dir; 466 struct stat sb; 467 char *dp, devname[MAXPATHLEN + 1]; 468 469 if ((dfd = opendir(_PATH_DEV)) == NULL) { 470 syslog(LOG_ERR, "%s: %s", _PATH_DEV, strerror(errno)); 471 exit(1); 472 } 473 (void)strcpy(devname, _PATH_DEV); 474 while ((dir = readdir(dfd))) { 475 (void)strcpy(devname + sizeof(_PATH_DEV) - 1, dir->d_name); 476 if (lstat(devname, &sb)) { 477 syslog(LOG_ERR, "%s: %s", devname, strerror(errno)); 478 continue; 479 } 480 if ((sb.st_mode & S_IFMT) != S_IFCHR && 481 (sb.st_mode & S_IFMT) != S_IFBLK) 482 continue; 483 if (dev == sb.st_rdev) { 484 closedir(dfd); 485 if ((dp = strdup(devname)) == NULL) { 486 syslog(LOG_ERR, "%s", strerror(errno)); 487 exit(1); 488 } 489 return (dp); 490 } 491 } 492 closedir(dfd); 493 syslog(LOG_ERR, "can't find device %d/%d", major(dev), minor(dev)); 494 exit(1); 495 } 496 497 int 498 get_crashtime() 499 { 500 time_t dumptime; /* Time the dump was taken. */ 501 502 DumpRead(dumpfd, &dumptime, sizeof(dumptime), 503 (off_t)(dumplo + ok(dump_nl[X_TIME].n_value)), L_SET); 504 if (dumptime == 0) { 505 if (verbose) 506 syslog(LOG_ERR, "dump time is zero"); 507 return (0); 508 } 509 (void)printf("savecore: system went down at %s", ctime(&dumptime)); 510 #define LEEWAY (7 * 86400) 511 if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) { 512 (void)printf("dump time is unreasonable\n"); 513 return (0); 514 } 515 return (1); 516 } 517 518 void 519 get_dumpsize() 520 { 521 /* Read the dump size. */ 522 DumpRead(dumpfd, &dumpsize, sizeof(dumpsize), 523 (off_t)(dumplo + ok(dump_nl[X_DUMPSIZE].n_value)), L_SET); 524 dumpsize *= getpagesize(); 525 } 526 527 int 528 check_space() 529 { 530 register FILE *fp; 531 const char *tkernel; 532 off_t minfree, spacefree, totfree, kernelsize, needed; 533 struct stat st; 534 struct statfs fsbuf; 535 char buf[100], path[MAXPATHLEN]; 536 537 tkernel = kernel ? kernel : getbootfile(); 538 if (stat(tkernel, &st) < 0) { 539 syslog(LOG_ERR, "%s: %m", tkernel); 540 exit(1); 541 } 542 kernelsize = st.st_blocks * S_BLKSIZE; 543 544 if (statfs(dirname, &fsbuf) < 0) { 545 syslog(LOG_ERR, "%s: %m", dirname); 546 exit(1); 547 } 548 spacefree = ((off_t) fsbuf.f_bavail * fsbuf.f_bsize) / 1024; 549 totfree = ((off_t) fsbuf.f_bfree * fsbuf.f_bsize) / 1024; 550 551 (void)snprintf(path, sizeof(path), "%s/minfree", dirname); 552 if ((fp = fopen(path, "r")) == NULL) 553 minfree = 0; 554 else { 555 if (fgets(buf, sizeof(buf), fp) == NULL) 556 minfree = 0; 557 else 558 minfree = atoi(buf); 559 (void)fclose(fp); 560 } 561 562 needed = (dumpsize + kernelsize) / 1024; 563 if (((minfree > 0) ? spacefree : totfree) - needed < minfree) { 564 syslog(LOG_WARNING, 565 "no dump, not enough free space on device (%lld available, need %lld)", 566 (long long)(minfree > 0 ? spacefree : totfree), 567 (long long)needed); 568 return (0); 569 } 570 if (spacefree - needed < 0) 571 syslog(LOG_WARNING, 572 "dump performed, but free space threshold crossed"); 573 return (1); 574 } 575 576 int 577 Open(name, rw) 578 const char *name; 579 int rw; 580 { 581 int fd; 582 583 if ((fd = open(name, rw, 0)) < 0) { 584 syslog(LOG_ERR, "%s: %m", name); 585 exit(1); 586 } 587 return (fd); 588 } 589 590 int 591 Read(fd, bp, size) 592 int fd, size; 593 void *bp; 594 { 595 int nr; 596 597 nr = read(fd, bp, size); 598 if (nr != size) { 599 syslog(LOG_ERR, "read: %m"); 600 exit(1); 601 } 602 return (nr); 603 } 604 605 void 606 Lseek(fd, off, flag) 607 int fd, flag; 608 off_t off; 609 { 610 off_t ret; 611 612 ret = lseek(fd, off, flag); 613 if (ret == -1) { 614 syslog(LOG_ERR, "lseek: %m"); 615 exit(1); 616 } 617 } 618 619 /* 620 * DumpWrite and DumpRead block io requests to the * dump device. 621 */ 622 #define DUMPBUFSIZE 8192 623 void 624 DumpWrite(fd, bp, size, off, flag) 625 int fd, size, flag; 626 void *bp; 627 off_t off; 628 { 629 unsigned char buf[DUMPBUFSIZE], *p, *q; 630 off_t pos; 631 int i, j; 632 633 if (flag != L_SET) { 634 syslog(LOG_ERR, "lseek: not LSET"); 635 exit(2); 636 } 637 q = bp; 638 while (size) { 639 pos = off & ~(DUMPBUFSIZE - 1); 640 Lseek(fd, pos, flag); 641 (void)Read(fd, buf, sizeof(buf)); 642 j = off & (DUMPBUFSIZE - 1); 643 p = buf + j; 644 i = size; 645 if (i > DUMPBUFSIZE - j) 646 i = DUMPBUFSIZE - j; 647 memcpy(p, q, i); 648 Lseek(fd, pos, flag); 649 (void)Write(fd, buf, sizeof(buf)); 650 size -= i; 651 q += i; 652 off += i; 653 } 654 } 655 656 void 657 DumpRead(fd, bp, size, off, flag) 658 int fd, size, flag; 659 void *bp; 660 off_t off; 661 { 662 unsigned char buf[DUMPBUFSIZE], *p, *q; 663 off_t pos; 664 int i, j; 665 666 if (flag != L_SET) { 667 syslog(LOG_ERR, "lseek: not LSET"); 668 exit(2); 669 } 670 q = bp; 671 while (size) { 672 pos = off & ~(DUMPBUFSIZE - 1); 673 Lseek(fd, pos, flag); 674 (void)Read(fd, buf, sizeof(buf)); 675 j = off & (DUMPBUFSIZE - 1); 676 p = buf + j; 677 i = size; 678 if (i > DUMPBUFSIZE - j) 679 i = DUMPBUFSIZE - j; 680 memcpy(q, p, i); 681 size -= i; 682 q += i; 683 off += i; 684 } 685 } 686 687 int 688 Create(file, mode) 689 char *file; 690 int mode; 691 { 692 register int fd; 693 694 fd = creat(file, mode); 695 if (fd < 0) { 696 syslog(LOG_ERR, "%s: %m", file); 697 exit(1); 698 } 699 return (fd); 700 } 701 702 void 703 Write(fd, bp, size) 704 int fd, size; 705 void *bp; 706 { 707 int n; 708 709 if ((n = write(fd, bp, size)) < size) { 710 syslog(LOG_ERR, "write: %s", strerror(n == -1 ? errno : EIO)); 711 exit(1); 712 } 713 } 714 715 void 716 usage() 717 { 718 (void)syslog(LOG_ERR, "usage: savecore [-cfvz] [-N system] directory"); 719 exit(1); 720 } 721