savecore.c revision 1.38
1 /* $NetBSD: savecore.c,v 1.38 1999/02/27 20:40:30 sommerfe 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 44 static char sccsid[] = "@(#)savecore.c 8.5 (Berkeley) 4/28/95"; 45 #else 46 __RCSID("$NetBSD: savecore.c,v 1.38 1999/02/27 20:40:30 sommerfe 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 70 extern 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 75 struct 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 }; 92 int cursyms[] = { X_DUMPDEV, 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 { "_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. */ 107 long dumplo; /* where dump starts on dumpdev */ 108 int dumpmag; /* magic number in dump */ 109 int dumpsize; /* amount of memory dumped */ 110 111 char *kernel; 112 char *dirname; /* directory to save dumps in */ 113 char *ddname; /* name of dump device */ 114 dev_t dumpdev; /* dump device */ 115 int dumpfd; /* read/write descriptor on block dev */ 116 kvm_t *kd_dump; /* kvm descriptor on block dev */ 117 time_t now; /* current date */ 118 char panic_mesg[1024]; 119 long panicstr; 120 char vers[1024]; 121 122 int clear, compress, force, verbose; /* flags */ 123 124 void check_kmem __P((void)); 125 int check_space __P((void)); 126 void clear_dump __P((void)); 127 int Create __P((char *, int)); 128 int dump_exists __P((void)); 129 char *find_dev __P((dev_t, int)); 130 int get_crashtime __P((void)); 131 void kmem_setup __P((void)); 132 void log __P((int, char *, ...)); 133 void Lseek __P((int, off_t, int)); 134 int main __P((int, char *[])); 135 int Open __P((char *, int rw)); 136 char *rawname __P((char *s)); 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 if ((!get_crashtime() || !check_space()) && !force) 202 exit(1); 203 204 save_core(); 205 206 clear_dump(); 207 exit(0); 208 } 209 210 void 211 kmem_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(NULL, 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 } 311 312 void 313 check_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 } 348 349 int 350 dump_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 } 383 384 void 385 clear_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 } 392 393 char buf[1024 * 1024]; 394 395 void 396 save_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)) 413 err1: 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 (void)fclose(fp); 426 427 /* Create the core file. */ 428 (void)snprintf(path, sizeof(path), "%s/netbsd.%d.core%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 fp = fdopen(ofd, "w"); 438 if (fp == NULL) { 439 syslog(LOG_ERR, "%s: fdopen: %s", path, 440 strerror(errno)); 441 exit(1); 442 } 443 } 444 445 /* Open the raw device. */ 446 rawp = rawname(ddname); 447 if ((ifd = open(rawp, O_RDONLY)) == -1) { 448 syslog(LOG_WARNING, "%s: %m; using block device", rawp); 449 ifd = dumpfd; 450 } 451 452 /* Seek to the start of the core. */ 453 Lseek(ifd, (off_t)dumplo, SEEK_SET); 454 455 if (kvm_dump_wrtheader(kd_dump, fp, dumpsize) == -1) { 456 syslog(LOG_ERR, "kvm_dump_wrtheader: %s : %s", path, 457 kvm_geterr(kd_dump)); 458 exit(1); 459 } 460 461 /* Copy the core file. */ 462 syslog(LOG_NOTICE, "writing %score to %s", 463 compress ? "compressed " : "", path); 464 for (; dumpsize > 0; dumpsize -= nr) { 465 (void)printf("%6dK\r", dumpsize / 1024); 466 (void)fflush(stdout); 467 nr = read(ifd, buf, MIN(dumpsize, sizeof(buf))); 468 if (nr <= 0) { 469 if (nr == 0) 470 syslog(LOG_WARNING, 471 "WARNING: EOF on dump device"); 472 else 473 syslog(LOG_ERR, "%s: %m", rawp); 474 goto err2; 475 } 476 nw = fwrite(buf, 1, nr, fp); 477 if (nw != nr) { 478 syslog(LOG_ERR, "%s: %s", 479 path, strerror(nw == 0 ? EIO : errno)); 480 err2: syslog(LOG_WARNING, 481 "WARNING: core may be incomplete"); 482 (void)printf("\n"); 483 exit(1); 484 } 485 } 486 (void)close(ifd); 487 (void)fclose(fp); 488 489 /* Copy the kernel. */ 490 ifd = Open(kernel ? kernel : _PATH_UNIX, O_RDONLY); 491 (void)snprintf(path, sizeof(path), "%s/netbsd.%d%s", 492 dirname, bounds, compress ? ".Z" : ""); 493 if (compress) { 494 if ((fp = zopen(path, "w", 0)) == NULL) { 495 syslog(LOG_ERR, "%s: %s", path, strerror(errno)); 496 exit(1); 497 } 498 } else 499 ofd = Create(path, S_IRUSR | S_IWUSR); 500 syslog(LOG_NOTICE, "writing %skernel to %s", 501 compress ? "compressed " : "", path); 502 while ((nr = read(ifd, buf, sizeof(buf))) > 0) { 503 if (compress) 504 nw = fwrite(buf, 1, nr, fp); 505 else 506 nw = write(ofd, buf, nr); 507 if (nw != nr) { 508 syslog(LOG_ERR, "%s: %s", 509 path, strerror(nw == 0 ? EIO : errno)); 510 syslog(LOG_WARNING, 511 "WARNING: kernel may be incomplete"); 512 exit(1); 513 } 514 } 515 if (nr < 0) { 516 syslog(LOG_ERR, "%s: %s", 517 kernel ? kernel : _PATH_UNIX, strerror(errno)); 518 syslog(LOG_WARNING, 519 "WARNING: kernel may be incomplete"); 520 exit(1); 521 } 522 if (compress) 523 (void)fclose(fp); 524 else 525 (void)close(ofd); 526 } 527 528 char * 529 find_dev(dev, type) 530 dev_t dev; 531 int type; 532 { 533 DIR *dfd; 534 struct dirent *dir; 535 struct stat sb; 536 char *dp, devname[MAXPATHLEN + 1]; 537 538 if ((dfd = opendir(_PATH_DEV)) == NULL) { 539 syslog(LOG_ERR, "%s: %s", _PATH_DEV, strerror(errno)); 540 exit(1); 541 } 542 (void)strcpy(devname, _PATH_DEV); 543 while ((dir = readdir(dfd))) { 544 (void)strcpy(devname + sizeof(_PATH_DEV) - 1, dir->d_name); 545 if (lstat(devname, &sb)) { 546 syslog(LOG_ERR, "%s: %s", devname, strerror(errno)); 547 continue; 548 } 549 if ((sb.st_mode & S_IFMT) != type) 550 continue; 551 if (dev == sb.st_rdev) { 552 closedir(dfd); 553 if ((dp = strdup(devname)) == NULL) { 554 syslog(LOG_ERR, "%s", strerror(errno)); 555 exit(1); 556 } 557 return (dp); 558 } 559 } 560 closedir(dfd); 561 syslog(LOG_ERR, "can't find device %d/%d", major(dev), minor(dev)); 562 exit(1); 563 } 564 565 char * 566 rawname(s) 567 char *s; 568 { 569 char *sl, name[MAXPATHLEN]; 570 571 if ((sl = strrchr(s, '/')) == NULL || sl[1] == '0') { 572 syslog(LOG_ERR, 573 "can't make raw dump device name from %s", s); 574 return (s); 575 } 576 (void)snprintf(name, sizeof(name), "%.*s/r%s", (int)(sl - s), s, 577 sl + 1); 578 if ((sl = strdup(name)) == NULL) { 579 syslog(LOG_ERR, "%s", strerror(errno)); 580 exit(1); 581 } 582 return (sl); 583 } 584 585 int 586 get_crashtime() 587 { 588 time_t dumptime; /* Time the dump was taken. */ 589 590 if (KREAD(kd_dump, dump_nl[X_TIME].n_value, &dumptime) != 0) { 591 if (verbose) 592 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 593 return (0); 594 } 595 if (dumptime == 0) { 596 if (verbose) 597 syslog(LOG_ERR, "dump time is zero"); 598 return (0); 599 } 600 (void)printf("savecore: system went down at %s", ctime(&dumptime)); 601 #define LEEWAY (7 * SECSPERDAY) 602 if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) { 603 (void)printf("dump time is unreasonable\n"); 604 return (0); 605 } 606 return (1); 607 } 608 609 int 610 check_space() 611 { 612 FILE *fp; 613 char *tkernel; 614 off_t minfree, spacefree, kernelsize, needed; 615 struct stat st; 616 struct statfs fsbuf; 617 char buf[100], path[MAXPATHLEN]; 618 619 #ifdef __GNUC__ 620 (void) &minfree; 621 #endif 622 623 tkernel = kernel ? kernel : _PATH_UNIX; 624 if (stat(tkernel, &st) < 0) { 625 syslog(LOG_ERR, "%s: %m", tkernel); 626 exit(1); 627 } 628 kernelsize = st.st_blocks * S_BLKSIZE; 629 if (statfs(dirname, &fsbuf) < 0) { 630 syslog(LOG_ERR, "%s: %m", dirname); 631 exit(1); 632 } 633 spacefree = fsbuf.f_bavail; 634 spacefree *= fsbuf.f_bsize; 635 spacefree /= 1024; 636 637 (void)snprintf(path, sizeof(path), "%s/minfree", dirname); 638 if ((fp = fopen(path, "r")) == NULL) 639 minfree = 0; 640 else { 641 if (fgets(buf, sizeof(buf), fp) == NULL) 642 minfree = 0; 643 else 644 minfree = atoi(buf); 645 (void)fclose(fp); 646 } 647 648 needed = (dumpsize + kernelsize) / 1024; 649 if (minfree > 0 && spacefree - needed < minfree) { 650 syslog(LOG_WARNING, 651 "no dump, not enough free space on device"); 652 return (0); 653 } 654 if (spacefree - needed < minfree) 655 syslog(LOG_WARNING, 656 "dump performed, but free space threshold crossed"); 657 return (1); 658 } 659 660 int 661 Open(name, rw) 662 char *name; 663 int rw; 664 { 665 int fd; 666 667 if ((fd = open(name, rw, 0)) < 0) { 668 syslog(LOG_ERR, "%s: %m", name); 669 exit(1); 670 } 671 return (fd); 672 } 673 674 void 675 Lseek(fd, off, flag) 676 int fd, flag; 677 off_t off; 678 { 679 off_t ret; 680 681 ret = lseek(fd, off, flag); 682 if (ret == -1) { 683 syslog(LOG_ERR, "lseek: %m"); 684 exit(1); 685 } 686 } 687 688 int 689 Create(file, mode) 690 char *file; 691 int mode; 692 { 693 int fd; 694 695 fd = open(file, O_WRONLY | O_CREAT | O_TRUNC, mode); 696 if (fd < 0) { 697 syslog(LOG_ERR, "%s: %m", file); 698 exit(1); 699 } 700 return (fd); 701 } 702 703 void 704 Write(fd, bp, size) 705 int fd, size; 706 void *bp; 707 { 708 int n; 709 710 if ((n = write(fd, bp, size)) < size) { 711 syslog(LOG_ERR, "write: %s", strerror(n == -1 ? errno : EIO)); 712 exit(1); 713 } 714 } 715 716 void 717 usage() 718 { 719 (void)syslog(LOG_ERR, "usage: savecore [-cfvz] [-N system] directory"); 720 exit(1); 721 } 722
Indexes created Fri Sep 26 20:09:58 GMT 2025