c97e08fb94
of dumpmag from an int to a u_long in rev 1.41 -- without this change, savecore will always fail like this: #savecore -v /var/crash dumplo = 874356736 (1707728 * 512) savecore: magic number mismatch (8fca0101 != 8fca0101) savecore: no core dump
793 lines
18 KiB
C
793 lines
18 KiB
C
/*-
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* Copyright (c) 1986, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1986, 1992, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)savecore.c 8.3 (Berkeley) 1/2/94";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include <sys/syslog.h>
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#include <sys/sysctl.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <nlist.h>
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#include <paths.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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extern FILE *zopen(const char *fname, const char *mode);
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#ifdef __alpha__
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#define ok(number) ALPHA_K0SEG_TO_PHYS(number)
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#endif
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#ifdef __i386__
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#define ok(number) ((number) - kernbase)
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#endif
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struct nlist current_nl[] = { /* Namelist for currently running system. */
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#define X_DUMPLO 0
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{ "_dumplo" },
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#define X_TIME 1
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{ "_time_second" },
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#define X_DUMPSIZE 2
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{ "_dumpsize" },
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#define X_VERSION 3
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{ "_version" },
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#define X_PANICSTR 4
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{ "_panicstr" },
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#define X_DUMPMAG 5
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{ "_dumpmag" },
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#define X_KERNBASE 6
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{ "_kernbase" },
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{ "" },
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};
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int cursyms[] = { X_DUMPLO, X_VERSION, X_DUMPMAG, -1 };
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int dumpsyms[] = { X_TIME, X_DUMPSIZE, X_VERSION, X_PANICSTR, X_DUMPMAG, -1 };
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struct nlist dump_nl[] = { /* Name list for dumped system. */
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{ "_dumplo" }, /* Entries MUST be the same as */
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{ "_time_second" }, /* those in current_nl[]. */
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{ "_dumpsize" },
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{ "_version" },
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{ "_panicstr" },
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{ "_dumpmag" },
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{ "_kernbase" },
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{ "" },
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};
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/* Types match kernel declarations. */
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u_long dumpmag; /* magic number in dump */
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/* Based on kernel variables, but with more convenient types. */
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off_t dumplo; /* where dump starts on dumpdev */
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off_t dumpsize; /* amount of memory dumped */
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char *kernel; /* user-specified kernel */
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char *savedir; /* directory to save dumps in */
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char ddname[MAXPATHLEN]; /* name of dump device */
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dev_t dumpdev; /* dump device */
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int dumpfd; /* read/write descriptor on char dev */
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time_t now; /* current date */
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char panic_mesg[1024]; /* panic message */
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int panicstr; /* flag: dump was caused by panic */
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char vers[1024]; /* version of kernel that crashed */
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#ifdef __i386__
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u_long kernbase; /* offset of kvm to core file */
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#endif
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int clear, compress, force, verbose; /* flags */
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int keep; /* keep dump on device */
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void check_kmem __P((void));
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int check_space __P((void));
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void clear_dump __P((void));
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void DumpRead __P((int fd, void *bp, int size, off_t off, int flag));
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void DumpWrite __P((int fd, void *bp, int size, off_t off, int flag));
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int dump_exists __P((void));
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void find_dev __P((dev_t));
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int get_crashtime __P((void));
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void get_dumpsize __P((void));
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void kmem_setup __P((void));
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void Lseek __P((int, off_t, int));
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int Open __P((const char *, int rw));
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int Read __P((int, void *, int));
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void save_core __P((void));
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void usage __P((void));
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void Write __P((int, void *, int));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int ch;
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openlog("savecore", LOG_PERROR, LOG_DAEMON);
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while ((ch = getopt(argc, argv, "cdfkN:vz")) != -1)
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switch(ch) {
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case 'c':
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clear = 1;
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break;
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case 'd': /* Not documented. */
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case 'v':
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verbose = 1;
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break;
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case 'f':
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force = 1;
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break;
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case 'k':
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keep = 1;
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break;
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case 'N':
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kernel = optarg;
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break;
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case 'z':
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compress = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (!clear) {
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if (argc != 1 && argc != 2)
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usage();
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savedir = argv[0];
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}
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if (argc == 2)
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kernel = argv[1];
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(void)time(&now);
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kmem_setup();
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if (clear) {
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clear_dump();
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exit(0);
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}
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if (!dump_exists() && !force)
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exit(1);
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check_kmem();
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if (panicstr)
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syslog(LOG_ALERT, "reboot after panic: %s", panic_mesg);
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else
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syslog(LOG_ALERT, "reboot");
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get_dumpsize();
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if ((!get_crashtime() || !check_space()) && !force)
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exit(1);
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save_core();
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if (!keep)
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clear_dump();
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exit(0);
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}
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void
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kmem_setup()
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{
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int kmem, i;
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const char *dump_sys;
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size_t len;
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long kdumplo; /* block number where dump starts on dumpdev */
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char *p;
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/*
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* Some names we need for the currently running system, others for
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* the system that was running when the dump was made. The values
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* obtained from the current system are used to look for things in
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* /dev/kmem that cannot be found in the dump_sys namelist, but are
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* presumed to be the same (since the disk partitions are probably
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* the same!)
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*/
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if ((nlist(getbootfile(), current_nl)) == -1)
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syslog(LOG_ERR, "%s: nlist: %m", getbootfile());
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for (i = 0; cursyms[i] != -1; i++)
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if (current_nl[cursyms[i]].n_value == 0) {
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syslog(LOG_ERR, "%s: %s not in namelist",
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getbootfile(), current_nl[cursyms[i]].n_name);
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exit(1);
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}
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dump_sys = kernel ? kernel : getbootfile();
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if ((nlist(dump_sys, dump_nl)) == -1)
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syslog(LOG_ERR, "%s: nlist: %m", dump_sys);
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for (i = 0; dumpsyms[i] != -1; i++)
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if (dump_nl[dumpsyms[i]].n_value == 0) {
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syslog(LOG_ERR, "%s: %s not in namelist",
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dump_sys, dump_nl[dumpsyms[i]].n_name);
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exit(1);
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}
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#ifdef __i386__
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if (dump_nl[X_KERNBASE].n_value != 0)
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kernbase = dump_nl[X_KERNBASE].n_value;
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else
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kernbase = KERNBASE;
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#endif
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len = sizeof dumpdev;
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if (sysctlbyname("kern.dumpdev", &dumpdev, &len, NULL, 0) == -1) {
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syslog(LOG_ERR, "sysctl: kern.dumpdev: %m");
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exit(1);
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}
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if (dumpdev == NODEV) {
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syslog(LOG_WARNING, "no core dump (no dumpdev)");
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exit(1);
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}
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kmem = Open(_PATH_KMEM, O_RDONLY);
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Lseek(kmem, (off_t)current_nl[X_DUMPLO].n_value, L_SET);
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(void)Read(kmem, &kdumplo, sizeof(kdumplo));
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dumplo = (off_t)kdumplo * DEV_BSIZE;
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if (verbose)
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(void)printf("dumplo = %lld (%ld * %d)\n",
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(long long)dumplo, kdumplo, DEV_BSIZE);
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Lseek(kmem, (off_t)current_nl[X_DUMPMAG].n_value, L_SET);
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(void)Read(kmem, &dumpmag, sizeof(dumpmag));
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find_dev(dumpdev);
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dumpfd = Open(ddname, O_RDWR);
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if (kernel)
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return;
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Lseek(kmem, (off_t)current_nl[X_VERSION].n_value, SEEK_SET);
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Read(kmem, vers, sizeof(vers));
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vers[sizeof(vers) - 1] = '\0';
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p = strchr(vers, '\n');
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if (p)
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p[1] = '\0';
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/* Don't fclose(fp), we use kmem later. */
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}
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void
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check_kmem()
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{
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char core_vers[1024], *p;
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DumpRead(dumpfd, core_vers, sizeof(core_vers),
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(off_t)(dumplo + ok(dump_nl[X_VERSION].n_value)), L_SET);
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core_vers[sizeof(core_vers) - 1] = '\0';
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p = strchr(core_vers, '\n');
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if (p)
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p[1] = '\0';
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if (strcmp(vers, core_vers) && kernel == 0)
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syslog(LOG_WARNING,
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"warning: %s version mismatch:\n\t\"%s\"\nand\t\"%s\"\n",
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getbootfile(), vers, core_vers);
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DumpRead(dumpfd, &panicstr, sizeof(panicstr),
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(off_t)(dumplo + ok(dump_nl[X_PANICSTR].n_value)), L_SET);
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if (panicstr) {
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DumpRead(dumpfd, panic_mesg, sizeof(panic_mesg),
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(off_t)(dumplo + ok(panicstr)), L_SET);
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}
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}
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/*
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* Clear the magic number in the dump header.
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*/
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void
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clear_dump()
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{
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u_long newdumpmag;
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newdumpmag = 0;
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DumpWrite(dumpfd, &newdumpmag, sizeof(newdumpmag),
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(off_t)(dumplo + ok(dump_nl[X_DUMPMAG].n_value)), L_SET);
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close(dumpfd);
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}
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/*
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* Check if a dump exists by looking for a magic number in the dump
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* header.
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*/
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int
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dump_exists()
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{
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u_long newdumpmag;
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DumpRead(dumpfd, &newdumpmag, sizeof(newdumpmag),
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(off_t)(dumplo + ok(dump_nl[X_DUMPMAG].n_value)), L_SET);
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if (newdumpmag != dumpmag) {
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if (verbose)
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syslog(LOG_WARNING, "magic number mismatch (%x != %x)",
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newdumpmag, dumpmag);
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syslog(LOG_WARNING, "no core dump");
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return (0);
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}
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return (1);
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}
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char buf[1024 * 1024];
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#define BLOCKSIZE (1<<12)
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#define BLOCKMASK (~(BLOCKSIZE-1))
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/*
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* Save the core dump.
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*/
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void
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save_core()
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{
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register FILE *fp;
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register int bounds, ifd, nr, nw;
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int hs, he; /* start and end of hole */
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char path[MAXPATHLEN];
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mode_t oumask;
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/*
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* Get the current number and update the bounds file. Do the update
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* now, because may fail later and don't want to overwrite anything.
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*/
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(void)snprintf(path, sizeof(path), "%s/bounds", savedir);
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if ((fp = fopen(path, "r")) == NULL)
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goto err1;
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if (fgets(buf, sizeof(buf), fp) == NULL) {
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if (ferror(fp))
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err1: syslog(LOG_WARNING, "%s: %m", path);
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bounds = 0;
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} else
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bounds = atoi(buf);
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if (fp != NULL)
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(void)fclose(fp);
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if ((fp = fopen(path, "w")) == NULL)
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syslog(LOG_ERR, "%s: %m", path);
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else {
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(void)fprintf(fp, "%d\n", bounds + 1);
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(void)fclose(fp);
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}
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/* Create the core file. */
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oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/
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(void)snprintf(path, sizeof(path), "%s/vmcore.%d%s",
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savedir, bounds, compress ? ".gz" : "");
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if (compress)
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fp = zopen(path, "w");
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else
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fp = fopen(path, "w");
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if (fp == NULL) {
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syslog(LOG_ERR, "%s: %m", path);
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exit(1);
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}
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(void)umask(oumask);
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/* Seek to the start of the core. */
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Lseek(dumpfd, (off_t)dumplo, L_SET);
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/* Copy the core file. */
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syslog(LOG_NOTICE, "writing %score to %s",
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compress ? "compressed " : "", path);
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for (; dumpsize > 0; dumpsize -= nr) {
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(void)printf("%6dK\r", dumpsize / 1024);
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(void)fflush(stdout);
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nr = read(dumpfd, buf, MIN(dumpsize, sizeof(buf)));
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if (nr <= 0) {
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if (nr == 0)
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syslog(LOG_WARNING,
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"WARNING: EOF on dump device");
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else
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syslog(LOG_ERR, "%s: %m", ddname);
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goto err2;
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}
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if (compress) {
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nw = fwrite(buf, 1, nr, fp);
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} else {
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for (nw = 0; nw < nr; nw = he) {
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/* find a contiguous block of zeroes */
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for (hs = nw; hs < nr; hs += BLOCKSIZE) {
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for (he = hs; he < nr && buf[he] == 0; ++he)
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/* nothing */ ;
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/* is the hole long enough to matter? */
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if (he >= hs + BLOCKSIZE)
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break;
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}
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/* back down to a block boundary */
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he &= BLOCKMASK;
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/*
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* 1) Don't go beyond the end of the buffer.
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* 2) If the end of the buffer is less than
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* BLOCKSIZE bytes away, we're at the end
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* of the file, so just grab what's left.
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*/
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if (hs + BLOCKSIZE > nr)
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hs = he = nr;
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/*
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* At this point, we have a partial ordering:
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* nw <= hs <= he <= nr
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* If hs > nw, buf[nw..hs] contains non-zero data.
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* If he > hs, buf[hs..he] is all zeroes.
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*/
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if (hs > nw)
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if (fwrite(buf + nw, hs - nw, 1, fp) != 1)
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break;
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if (he > hs)
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if (fseek(fp, he - hs, SEEK_CUR) == -1)
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break;
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}
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}
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if (nw != nr) {
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syslog(LOG_ERR, "%s: %m", path);
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err2: syslog(LOG_WARNING,
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"WARNING: vmcore may be incomplete");
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(void)printf("\n");
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exit(1);
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}
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}
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(void)fclose(fp);
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/* Copy the kernel. */
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ifd = Open(kernel ? kernel : getbootfile(), O_RDONLY);
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(void)snprintf(path, sizeof(path), "%s/kernel.%d%s",
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savedir, bounds, compress ? ".gz" : "");
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if (compress)
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fp = zopen(path, "w");
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else
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fp = fopen(path, "w");
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if (fp == NULL) {
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syslog(LOG_ERR, "%s: %m", path);
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exit(1);
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}
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syslog(LOG_NOTICE, "writing %skernel to %s",
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compress ? "compressed " : "", path);
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while ((nr = read(ifd, buf, sizeof(buf))) > 0) {
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nw = fwrite(buf, 1, nr, fp);
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if (nw != nr) {
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syslog(LOG_ERR, "%s: %m", path);
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syslog(LOG_WARNING,
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"WARNING: kernel may be incomplete");
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exit(1);
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}
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}
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if (nr < 0) {
|
|
syslog(LOG_ERR, "%s: %m", kernel ? kernel : getbootfile());
|
|
syslog(LOG_WARNING,
|
|
"WARNING: kernel may be incomplete");
|
|
exit(1);
|
|
}
|
|
(void)fclose(fp);
|
|
close(ifd);
|
|
}
|
|
|
|
/*
|
|
* Verify that the specified device node exists and matches the
|
|
* specified device.
|
|
*/
|
|
int
|
|
verify_dev(name, dev)
|
|
char *name;
|
|
register dev_t dev;
|
|
{
|
|
struct stat sb;
|
|
|
|
if (lstat(name, &sb) == -1)
|
|
return (-1);
|
|
if (!S_ISCHR(sb.st_mode) || sb.st_rdev != dev)
|
|
return (-1);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Find the dump device.
|
|
*
|
|
* 1) try devname(3); see if it returns something sensible
|
|
* 2) scan /dev for the desired node
|
|
* 3) as a last resort, try to create the node we need
|
|
*/
|
|
void
|
|
find_dev(dev)
|
|
register dev_t dev;
|
|
{
|
|
struct dirent *ent;
|
|
char *dn, *dnp;
|
|
DIR *d;
|
|
|
|
strcpy(ddname, _PATH_DEV);
|
|
dnp = ddname + sizeof _PATH_DEV - 1;
|
|
if ((dn = devname(dev, S_IFCHR)) != NULL) {
|
|
strcpy(dnp, dn);
|
|
if (verify_dev(ddname, dev) == 0)
|
|
return;
|
|
}
|
|
if ((d = opendir(_PATH_DEV)) != NULL) {
|
|
while ((ent = readdir(d))) {
|
|
strcpy(dnp, ent->d_name);
|
|
if (verify_dev(ddname, dev) == 0) {
|
|
closedir(d);
|
|
return;
|
|
}
|
|
}
|
|
closedir(d);
|
|
}
|
|
strcpy(dnp, "dump");
|
|
if (mknod(ddname, S_IFCHR|S_IRUSR|S_IWUSR, dev) == 0)
|
|
return;
|
|
syslog(LOG_ERR, "can't find device %d/%#x", major(dev), minor(dev));
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* Extract the date and time of the crash from the dump header, and
|
|
* make sure it looks sane (within one week of current date and time).
|
|
*/
|
|
int
|
|
get_crashtime()
|
|
{
|
|
time_t dumptime; /* Time the dump was taken. */
|
|
|
|
DumpRead(dumpfd, &dumptime, sizeof(dumptime),
|
|
(off_t)(dumplo + ok(dump_nl[X_TIME].n_value)), L_SET);
|
|
if (dumptime == 0) {
|
|
if (verbose)
|
|
syslog(LOG_ERR, "dump time is zero");
|
|
return (0);
|
|
}
|
|
(void)printf("savecore: system went down at %s", ctime(&dumptime));
|
|
#define LEEWAY (7 * 86400)
|
|
if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) {
|
|
(void)printf("dump time is unreasonable\n");
|
|
return (0);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Extract the size of the dump from the dump header.
|
|
*/
|
|
void
|
|
get_dumpsize()
|
|
{
|
|
int kdumpsize;
|
|
|
|
/* Read the dump size. */
|
|
DumpRead(dumpfd, &kdumpsize, sizeof(kdumpsize),
|
|
(off_t)(dumplo + ok(dump_nl[X_DUMPSIZE].n_value)), L_SET);
|
|
dumpsize = kdumpsize * getpagesize();
|
|
}
|
|
|
|
/*
|
|
* Check that sufficient space is available on the disk that holds the
|
|
* save directory.
|
|
*/
|
|
int
|
|
check_space()
|
|
{
|
|
register FILE *fp;
|
|
const char *tkernel;
|
|
off_t minfree, spacefree, totfree, kernelsize, needed;
|
|
struct stat st;
|
|
struct statfs fsbuf;
|
|
char buf[100], path[MAXPATHLEN];
|
|
|
|
tkernel = kernel ? kernel : getbootfile();
|
|
if (stat(tkernel, &st) < 0) {
|
|
syslog(LOG_ERR, "%s: %m", tkernel);
|
|
exit(1);
|
|
}
|
|
kernelsize = st.st_blocks * S_BLKSIZE;
|
|
|
|
if (statfs(savedir, &fsbuf) < 0) {
|
|
syslog(LOG_ERR, "%s: %m", savedir);
|
|
exit(1);
|
|
}
|
|
spacefree = ((off_t) fsbuf.f_bavail * fsbuf.f_bsize) / 1024;
|
|
totfree = ((off_t) fsbuf.f_bfree * fsbuf.f_bsize) / 1024;
|
|
|
|
(void)snprintf(path, sizeof(path), "%s/minfree", savedir);
|
|
if ((fp = fopen(path, "r")) == NULL)
|
|
minfree = 0;
|
|
else {
|
|
if (fgets(buf, sizeof(buf), fp) == NULL)
|
|
minfree = 0;
|
|
else
|
|
minfree = atoi(buf);
|
|
(void)fclose(fp);
|
|
}
|
|
|
|
needed = (dumpsize + kernelsize) / 1024;
|
|
if (((minfree > 0) ? spacefree : totfree) - needed < minfree) {
|
|
syslog(LOG_WARNING,
|
|
"no dump, not enough free space on device (%lld available, need %lld)",
|
|
(long long)(minfree > 0 ? spacefree : totfree),
|
|
(long long)needed);
|
|
return (0);
|
|
}
|
|
if (spacefree - needed < 0)
|
|
syslog(LOG_WARNING,
|
|
"dump performed, but free space threshold crossed");
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
Open(name, rw)
|
|
const char *name;
|
|
int rw;
|
|
{
|
|
int fd;
|
|
|
|
if ((fd = open(name, rw, 0)) < 0) {
|
|
syslog(LOG_ERR, "%s: %m", name);
|
|
exit(1);
|
|
}
|
|
return (fd);
|
|
}
|
|
|
|
int
|
|
Read(fd, bp, size)
|
|
int fd, size;
|
|
void *bp;
|
|
{
|
|
int nr;
|
|
|
|
nr = read(fd, bp, size);
|
|
if (nr != size) {
|
|
syslog(LOG_ERR, "read: %m");
|
|
exit(1);
|
|
}
|
|
return (nr);
|
|
}
|
|
|
|
void
|
|
Lseek(fd, off, flag)
|
|
int fd, flag;
|
|
off_t off;
|
|
{
|
|
off_t ret;
|
|
|
|
ret = lseek(fd, off, flag);
|
|
if (ret == -1) {
|
|
syslog(LOG_ERR, "lseek: %m");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* DumpWrite and DumpRead block io requests to the * dump device.
|
|
*/
|
|
#define DUMPBUFSIZE 8192
|
|
void
|
|
DumpWrite(fd, bp, size, off, flag)
|
|
int fd, size, flag;
|
|
void *bp;
|
|
off_t off;
|
|
{
|
|
unsigned char buf[DUMPBUFSIZE], *p, *q;
|
|
off_t pos;
|
|
int i, j;
|
|
|
|
if (flag != L_SET) {
|
|
syslog(LOG_ERR, "lseek: not LSET");
|
|
exit(2);
|
|
}
|
|
q = bp;
|
|
while (size) {
|
|
pos = off & ~(DUMPBUFSIZE - 1);
|
|
Lseek(fd, pos, flag);
|
|
(void)Read(fd, buf, sizeof(buf));
|
|
j = off & (DUMPBUFSIZE - 1);
|
|
p = buf + j;
|
|
i = size;
|
|
if (i > DUMPBUFSIZE - j)
|
|
i = DUMPBUFSIZE - j;
|
|
memcpy(p, q, i);
|
|
Lseek(fd, pos, flag);
|
|
(void)Write(fd, buf, sizeof(buf));
|
|
size -= i;
|
|
q += i;
|
|
off += i;
|
|
}
|
|
}
|
|
|
|
void
|
|
DumpRead(fd, bp, size, off, flag)
|
|
int fd, size, flag;
|
|
void *bp;
|
|
off_t off;
|
|
{
|
|
unsigned char buf[DUMPBUFSIZE], *p, *q;
|
|
off_t pos;
|
|
int i, j;
|
|
|
|
if (flag != L_SET) {
|
|
syslog(LOG_ERR, "lseek: not LSET");
|
|
exit(2);
|
|
}
|
|
q = bp;
|
|
while (size) {
|
|
pos = off & ~(DUMPBUFSIZE - 1);
|
|
Lseek(fd, pos, flag);
|
|
(void)Read(fd, buf, sizeof(buf));
|
|
j = off & (DUMPBUFSIZE - 1);
|
|
p = buf + j;
|
|
i = size;
|
|
if (i > DUMPBUFSIZE - j)
|
|
i = DUMPBUFSIZE - j;
|
|
memcpy(q, p, i);
|
|
size -= i;
|
|
q += i;
|
|
off += i;
|
|
}
|
|
}
|
|
|
|
void
|
|
Write(fd, bp, size)
|
|
int fd, size;
|
|
void *bp;
|
|
{
|
|
int n;
|
|
|
|
if ((n = write(fd, bp, size)) < size) {
|
|
syslog(LOG_ERR, "write: %m");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
void
|
|
usage()
|
|
{
|
|
(void)syslog(LOG_ERR, "usage: savecore [-cfkvz] [-N system] directory");
|
|
exit(1);
|
|
}
|