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 long 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 block 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, int)); 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 char *rawname __P((char *s)); 138 void save_core __P((void)); 139 void usage __P((void)); 140 void Write __P((int, void *, int)); 141 142 int 143 main(argc, argv) 144 int argc; 145 char *argv[]; 146 { 147 int ch; 148 149 openlog("savecore", LOG_PERROR, LOG_DAEMON); 150 151 while ((ch = getopt(argc, argv, "cdfN:vz")) != -1) 152 switch(ch) { 153 case 'c': 154 clear = 1; 155 break; 156 case 'd': /* Not documented. */ 157 case 'v': 158 verbose = 1; 159 break; 160 case 'f': 161 force = 1; 162 break; 163 case 'N': 164 kernel = optarg; 165 break; 166 case 'z': 167 compress = 1; 168 break; 169 case '?': 170 default: 171 usage(); 172 } 173 argc -= optind; 174 argv += optind; 175 176 if (!clear) { 177 if (argc != 1 && argc != 2) 178 usage(); 179 dirname = argv[0]; 180 } 181 if (argc == 2) 182 kernel = argv[1]; 183 184 (void)time(&now); 185 kmem_setup(); 186 187 if (clear) { 188 clear_dump(); 189 exit(0); 190 } 191 192 if (!dump_exists() && !force) 193 exit(1); 194 195 check_kmem(); 196 197 if (panicstr) 198 syslog(LOG_ALERT, "reboot after panic: %s", panic_mesg); 199 else 200 syslog(LOG_ALERT, "reboot"); 201 202 get_dumpsize(); 203 204 if ((!get_crashtime() || !check_space()) && !force) 205 exit(1); 206 207 save_core(); 208 209 clear_dump(); 210 exit(0); 211 } 212 213 void 214 kmem_setup() 215 { 216 FILE *fp; 217 int kmem, i; 218 const char *dump_sys; 219 int mib[2]; 220 size_t len; 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, &dumplo, sizeof(dumplo)); 265 if (verbose) 266 (void)printf("dumplo = %ld (%ld * %d)\n", 267 dumplo, dumplo/DEV_BSIZE, DEV_BSIZE); 268 Lseek(kmem, (off_t)current_nl[X_DUMPMAG].n_value, L_SET); 269 (void)Read(kmem, &dumpmag, sizeof(dumpmag)); 270 dumplo *= DEV_BSIZE; 271 ddname = find_dev(dumpdev, S_IFBLK); 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 register char *cp; 290 char core_vers[1024], *p; 291 292 DumpRead(dumpfd, core_vers, sizeof(core_vers), 293 (off_t)(dumplo + ok(dump_nl[X_VERSION].n_value)), L_SET); 294 core_vers[sizeof(core_vers) - 1] = '\0'; 295 p = strchr(core_vers, '\n'); 296 if (p) 297 p[1] = '\0'; 298 if (strcmp(vers, core_vers) && kernel == 0) 299 syslog(LOG_WARNING, 300 "warning: %s version mismatch:\n\t\"%s\"\nand\t\"%s\"\n", 301 getbootfile(), vers, core_vers); 302 DumpRead(dumpfd, &panicstr, sizeof(panicstr), 303 (off_t)(dumplo + ok(dump_nl[X_PANICSTR].n_value)), L_SET); 304 if (panicstr) { 305 DumpRead(dumpfd, panic_mesg, sizeof(panic_mesg), 306 (off_t)(dumplo + ok(panicstr)), L_SET); 307 } 308 } 309 310 void 311 clear_dump() 312 { 313 long newdumplo; 314 315 newdumplo = 0; 316 DumpWrite(dumpfd, &newdumplo, sizeof(newdumplo), 317 (off_t)(dumplo + ok(dump_nl[X_DUMPMAG].n_value)), L_SET); 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 *rawp, 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 } else 379 ofd = Create(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); 380 (void)umask(oumask); 381 382 /* Open the raw device. */ 383 rawp = rawname(ddname); 384 if ((ifd = open(rawp, O_RDONLY)) == -1) { 385 syslog(LOG_WARNING, "%s: %m; using block device", rawp); 386 ifd = dumpfd; 387 } 388 389 /* Seek to the start of the core. */ 390 Lseek(ifd, (off_t)dumplo, L_SET); 391 392 /* Copy the core file. */ 393 syslog(LOG_NOTICE, "writing %score to %s", 394 compress ? "compressed " : "", path); 395 for (; dumpsize > 0; dumpsize -= nr) { 396 (void)printf("%6dK\r", dumpsize / 1024); 397 (void)fflush(stdout); 398 nr = read(ifd, buf, MIN(dumpsize, sizeof(buf))); 399 if (nr <= 0) { 400 if (nr == 0) 401 syslog(LOG_WARNING, 402 "WARNING: EOF on dump device"); 403 else 404 syslog(LOG_ERR, "%s: %m", rawp); 405 goto err2; 406 } 407 if (compress) 408 nw = fwrite(buf, 1, nr, fp); 409 else 410 nw = write(ofd, buf, nr); 411 if (nw != nr) { 412 syslog(LOG_ERR, "%s: %s", 413 path, strerror(nw == 0 ? EIO : errno)); 414 err2: syslog(LOG_WARNING, 415 "WARNING: vmcore may be incomplete"); 416 (void)printf("\n"); 417 exit(1); 418 } 419 } 420 (void)close(ifd); 421 if (compress) 422 (void)fclose(fp); 423 else 424 (void)close(ofd); 425 426 /* Copy the kernel. */ 427 ifd = Open(kernel ? kernel : getbootfile(), O_RDONLY); 428 (void)snprintf(path, sizeof(path), "%s/kernel.%d%s", 429 dirname, bounds, compress ? ".Z" : ""); 430 if (compress) { 431 if ((fp = zopen(path, "w", 0)) == NULL) { 432 syslog(LOG_ERR, "%s: %s", path, strerror(errno)); 433 exit(1); 434 } 435 } else 436 ofd = Create(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); 437 syslog(LOG_NOTICE, "writing %skernel to %s", 438 compress ? "compressed " : "", path); 439 while ((nr = read(ifd, buf, sizeof(buf))) > 0) { 440 if (compress) 441 nw = fwrite(buf, 1, nr, fp); 442 else 443 nw = write(ofd, buf, nr); 444 if (nw != nr) { 445 syslog(LOG_ERR, "%s: %s", 446 path, strerror(nw == 0 ? EIO : errno)); 447 syslog(LOG_WARNING, 448 "WARNING: kernel may be incomplete"); 449 exit(1); 450 } 451 } 452 if (nr < 0) { 453 syslog(LOG_ERR, "%s: %s", 454 kernel ? kernel : getbootfile(), strerror(errno)); 455 syslog(LOG_WARNING, 456 "WARNING: kernel may be incomplete"); 457 exit(1); 458 } 459 if (compress) 460 (void)fclose(fp); 461 else 462 (void)close(ofd); 463 } 464 465 char * 466 find_dev(dev, type) 467 register dev_t dev; 468 register int type; 469 { 470 register DIR *dfd; 471 struct dirent *dir; 472 struct stat sb; 473 char *dp, devname[MAXPATHLEN + 1]; 474 475 if ((dfd = opendir(_PATH_DEV)) == NULL) { 476 syslog(LOG_ERR, "%s: %s", _PATH_DEV, strerror(errno)); 477 exit(1); 478 } 479 (void)strcpy(devname, _PATH_DEV); 480 while ((dir = readdir(dfd))) { 481 (void)strcpy(devname + sizeof(_PATH_DEV) - 1, dir->d_name); 482 if (lstat(devname, &sb)) { 483 syslog(LOG_ERR, "%s: %s", devname, strerror(errno)); 484 continue; 485 } 486 if ((sb.st_mode & S_IFMT) != type) 487 continue; 488 if (dev == sb.st_rdev) { 489 closedir(dfd); 490 if ((dp = strdup(devname)) == NULL) { 491 syslog(LOG_ERR, "%s", strerror(errno)); 492 exit(1); 493 } 494 return (dp); 495 } 496 } 497 closedir(dfd); 498 syslog(LOG_ERR, "can't find device %d/%d", major(dev), minor(dev)); 499 exit(1); 500 } 501 502 char * 503 rawname(s) 504 char *s; 505 { 506 char *sl, name[MAXPATHLEN]; 507 508 if ((sl = rindex(s, '/')) == NULL || sl[1] == '0') { 509 syslog(LOG_ERR, 510 "can't make raw dump device name from %s", s); 511 return (s); 512 } 513 (void)snprintf(name, sizeof(name), "%.*s/r%s", sl - s, s, sl + 1); 514 if ((sl = strdup(name)) == NULL) { 515 syslog(LOG_ERR, "%s", strerror(errno)); 516 exit(1); 517 } 518 return (sl); 519 } 520 521 int 522 get_crashtime() 523 { 524 time_t dumptime; /* Time the dump was taken. */ 525 526 DumpRead(dumpfd, &dumptime, sizeof(dumptime), 527 (off_t)(dumplo + ok(dump_nl[X_TIME].n_value)), L_SET); 528 if (dumptime == 0) { 529 if (verbose) 530 syslog(LOG_ERR, "dump time is zero"); 531 return (0); 532 } 533 (void)printf("savecore: system went down at %s", ctime(&dumptime)); 534 #define LEEWAY (7 * 86400) 535 if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) { 536 (void)printf("dump time is unreasonable\n"); 537 return (0); 538 } 539 return (1); 540 } 541 542 void 543 get_dumpsize() 544 { 545 /* Read the dump size. */ 546 DumpRead(dumpfd, &dumpsize, sizeof(dumpsize), 547 (off_t)(dumplo + ok(dump_nl[X_DUMPSIZE].n_value)), L_SET); 548 dumpsize *= getpagesize(); 549 } 550 551 int 552 check_space() 553 { 554 register FILE *fp; 555 const char *tkernel; 556 off_t minfree, spacefree, totfree, kernelsize, needed; 557 struct stat st; 558 struct statfs fsbuf; 559 char buf[100], path[MAXPATHLEN]; 560 561 tkernel = kernel ? kernel : getbootfile(); 562 if (stat(tkernel, &st) < 0) { 563 syslog(LOG_ERR, "%s: %m", tkernel); 564 exit(1); 565 } 566 kernelsize = st.st_blocks * S_BLKSIZE; 567 568 if (statfs(dirname, &fsbuf) < 0) { 569 syslog(LOG_ERR, "%s: %m", dirname); 570 exit(1); 571 } 572 spacefree = ((off_t) fsbuf.f_bavail * fsbuf.f_bsize) / 1024; 573 totfree = ((off_t) fsbuf.f_bfree * fsbuf.f_bsize) / 1024; 574 575 (void)snprintf(path, sizeof(path), "%s/minfree", dirname); 576 if ((fp = fopen(path, "r")) == NULL) 577 minfree = 0; 578 else { 579 if (fgets(buf, sizeof(buf), fp) == NULL) 580 minfree = 0; 581 else 582 minfree = atoi(buf); 583 (void)fclose(fp); 584 } 585 586 needed = (dumpsize + kernelsize) / 1024; 587 if (((minfree > 0) ? spacefree : totfree) - needed < minfree) { 588 syslog(LOG_WARNING, 589 "no dump, not enough free space on device"); 590 return (0); 591 } 592 if (spacefree - needed < 0) 593 syslog(LOG_WARNING, 594 "dump performed, but free space threshold crossed"); 595 return (1); 596 } 597 598 int 599 Open(name, rw) 600 const char *name; 601 int rw; 602 { 603 int fd; 604 605 if ((fd = open(name, rw, 0)) < 0) { 606 syslog(LOG_ERR, "%s: %m", name); 607 exit(1); 608 } 609 return (fd); 610 } 611 612 int 613 Read(fd, bp, size) 614 int fd, size; 615 void *bp; 616 { 617 int nr; 618 619 nr = read(fd, bp, size); 620 if (nr != size) { 621 syslog(LOG_ERR, "read: %m"); 622 exit(1); 623 } 624 return (nr); 625 } 626 627 void 628 Lseek(fd, off, flag) 629 int fd, flag; 630 off_t off; 631 { 632 off_t ret; 633 634 ret = lseek(fd, off, flag); 635 if (ret == -1) { 636 syslog(LOG_ERR, "lseek: %m"); 637 exit(1); 638 } 639 } 640 641 /* 642 * DumpWrite and DumpRead block io requests to the * dump device. 643 */ 644 #define DUMPBUFSIZE 8192 645 void 646 DumpWrite(fd, bp, size, off, flag) 647 int fd, size, flag; 648 void *bp; 649 off_t off; 650 { 651 unsigned char buf[DUMPBUFSIZE], *p, *q; 652 off_t pos; 653 int i, j; 654 655 if (flag != L_SET) { 656 syslog(LOG_ERR, "lseek: not LSET"); 657 exit(2); 658 } 659 q = bp; 660 while (size) { 661 pos = off & ~(DUMPBUFSIZE - 1); 662 Lseek(fd, pos, flag); 663 (void)Read(fd, buf, sizeof(buf)); 664 j = off & (DUMPBUFSIZE - 1); 665 p = buf + j; 666 i = size; 667 if (i > DUMPBUFSIZE - j) 668 i = DUMPBUFSIZE - j; 669 memcpy(p, q, i); 670 Lseek(fd, pos, flag); 671 (void)Write(fd, buf, sizeof(buf)); 672 size -= i; 673 q += i; 674 off += i; 675 } 676 } 677 678 void 679 DumpRead(fd, bp, size, off, flag) 680 int fd, size, flag; 681 void *bp; 682 off_t off; 683 { 684 unsigned char buf[DUMPBUFSIZE], *p, *q; 685 off_t pos; 686 int i, j; 687 688 if (flag != L_SET) { 689 syslog(LOG_ERR, "lseek: not LSET"); 690 exit(2); 691 } 692 q = bp; 693 while (size) { 694 pos = off & ~(DUMPBUFSIZE - 1); 695 Lseek(fd, pos, flag); 696 (void)Read(fd, buf, sizeof(buf)); 697 j = off & (DUMPBUFSIZE - 1); 698 p = buf + j; 699 i = size; 700 if (i > DUMPBUFSIZE - j) 701 i = DUMPBUFSIZE - j; 702 memcpy(q, p, i); 703 size -= i; 704 q += i; 705 off += i; 706 } 707 } 708 709 int 710 Create(file, mode) 711 char *file; 712 int mode; 713 { 714 register int fd; 715 716 fd = creat(file, mode); 717 if (fd < 0) { 718 syslog(LOG_ERR, "%s: %m", file); 719 exit(1); 720 } 721 return (fd); 722 } 723 724 void 725 Write(fd, bp, size) 726 int fd, size; 727 void *bp; 728 { 729 int n; 730 731 if ((n = write(fd, bp, size)) < size) { 732 syslog(LOG_ERR, "write: %s", strerror(n == -1 ? errno : EIO)); 733 exit(1); 734 } 735 } 736 737 void 738 usage() 739 { 740 (void)syslog(LOG_ERR, "usage: savecore [-cfvz] [-N system] directory"); 741 exit(1); 742 } 743