339 lines
8.5 KiB
C
339 lines
8.5 KiB
C
/*-
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* Copyright (c) 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) 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[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93";
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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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/*
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* Originally written by Eric Cooper in Fall 1981.
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* Inspired by a version 6 program by Len Levin, 1978.
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* Several pieces of code lifted from Bill Joy's 4BSD ps.
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* Most recently, hacked beyond recognition for 4.4BSD by Steven McCanne,
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* Lawrence Berkeley Laboratory.
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*
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* Portions of this software were developed by the Computer Systems
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* Engineering group at Lawrence Berkeley Laboratory under DARPA
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* contract BG 91-66 and contributed to Berkeley.
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*/
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <sys/proc.h>
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#include <sys/user.h>
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#include <sys/sysctl.h>
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#include <machine/elf.h>
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#include <machine/vmparam.h>
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#include <a.out.h>
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#include <err.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <limits.h>
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#include <signal.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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#include "extern.h"
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static void core __P((int, int, struct kinfo_proc *));
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static void datadump __P((int, int, struct kinfo_proc *, u_long, int));
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static void killed __P((int));
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static void restart_target __P((void));
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static void usage __P((void)) __dead2;
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static void userdump __P((int, struct kinfo_proc *, u_long, int));
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kvm_t *kd;
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static int data_offset;
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static pid_t pid;
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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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struct kinfo_proc *ki = NULL;
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struct exec exec;
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int ch, cnt, efd, fd, sflag, uid;
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char *binfile, *corefile;
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char errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN];
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int is_aout;
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sflag = 0;
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corefile = NULL;
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while ((ch = getopt(argc, argv, "c:s")) != -1) {
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switch (ch) {
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case 'c':
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corefile = optarg;
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break;
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case 's':
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sflag = 1;
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break;
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default:
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usage();
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break;
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}
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}
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argv += optind;
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argc -= optind;
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/* XXX we should check that the pid argument is really a number */
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switch (argc) {
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case 1:
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pid = atoi(argv[0]);
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asprintf(&binfile, "/proc/%d/file", pid);
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if (binfile == NULL)
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errx(1, "allocation failure");
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break;
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case 2:
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pid = atoi(argv[1]);
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binfile = argv[0];
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break;
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default:
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usage();
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}
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efd = open(binfile, O_RDONLY, 0);
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if (efd < 0)
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err(1, "%s", binfile);
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cnt = read(efd, &exec, sizeof(exec));
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if (cnt != sizeof(exec))
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errx(1, "%s exec header: %s",
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binfile, cnt > 0 ? strerror(EIO) : strerror(errno));
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if (!N_BADMAG(exec)) {
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is_aout = 1;
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/*
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* This legacy a.out support uses the kvm interface instead
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* of procfs.
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*/
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kd = kvm_openfiles(0, 0, 0, O_RDONLY, errbuf);
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if (kd == NULL)
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errx(1, "%s", errbuf);
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uid = getuid();
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ki = kvm_getprocs(kd, KERN_PROC_PID, pid, &cnt);
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if (ki == NULL || cnt != 1)
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errx(1, "%d: not found", pid);
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if (ki->ki_ruid != uid && uid != 0)
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errx(1, "%d: not owner", pid);
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if (ki->ki_stat == SZOMB)
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errx(1, "%d: zombie", pid);
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if (ki->ki_flag & P_WEXIT)
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errx(1, "%d: process exiting", pid);
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if (ki->ki_flag & P_SYSTEM) /* Swapper or pagedaemon. */
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errx(1, "%d: system process", pid);
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if (exec.a_text != ptoa(ki->ki_tsize))
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errx(1, "The executable %s does not belong to"
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" process %d!\n"
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"Text segment size (in bytes): executable %ld,"
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" process %d", binfile, pid, exec.a_text,
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ptoa(ki->ki_tsize));
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data_offset = N_DATOFF(exec);
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} else if (IS_ELF(*(Elf_Ehdr *)&exec)) {
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is_aout = 0;
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close(efd);
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} else
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errx(1, "Invalid executable file");
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if (corefile == NULL) {
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(void)snprintf(fname, sizeof(fname), "core.%d", pid);
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corefile = fname;
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}
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fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE);
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if (fd < 0)
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err(1, "%s", corefile);
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if (sflag) {
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signal(SIGHUP, killed);
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signal(SIGINT, killed);
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signal(SIGTERM, killed);
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if (kill(pid, SIGSTOP) == -1)
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err(1, "%d: stop signal", pid);
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atexit(restart_target);
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}
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if (is_aout)
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core(efd, fd, ki);
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else
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elf_coredump(fd, pid);
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(void)close(fd);
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exit(0);
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}
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/*
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* core --
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* Build the core file.
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*/
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void
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core(efd, fd, ki)
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int efd;
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int fd;
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struct kinfo_proc *ki;
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{
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union {
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struct user user;
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char ubytes[ctob(UPAGES)];
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} uarea;
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int tsize = ki->ki_tsize;
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int dsize = ki->ki_dsize;
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int ssize = ki->ki_ssize;
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int cnt;
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/* Read in user struct */
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cnt = kvm_read(kd, (u_long)ki->ki_addr, &uarea, sizeof(uarea));
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if (cnt != sizeof(uarea))
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errx(1, "read user structure: %s",
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cnt > 0 ? strerror(EIO) : strerror(errno));
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/*
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* Fill in the eproc vm parameters, since these are garbage unless
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* the kernel is dumping core or something.
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*/
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uarea.user.u_kproc = *ki;
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/* Dump user area */
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cnt = write(fd, &uarea, sizeof(uarea));
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if (cnt != sizeof(uarea))
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errx(1, "write user structure: %s",
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cnt > 0 ? strerror(EIO) : strerror(errno));
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/* Dump data segment */
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datadump(efd, fd, ki, USRTEXT + ctob(tsize), dsize);
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/* Dump stack segment */
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userdump(fd, ki, USRSTACK - ctob(ssize), ssize);
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/* Dump machine dependent portions of the core. */
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md_core(kd, fd, ki);
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}
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void
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datadump(efd, fd, kp, addr, npage)
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register int efd;
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register int fd;
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struct kinfo_proc *kp;
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register u_long addr;
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register int npage;
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{
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register int cc, delta;
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char buffer[PAGE_SIZE];
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delta = data_offset - addr;
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while (--npage >= 0) {
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cc = kvm_uread(kd, kp, addr, buffer, PAGE_SIZE);
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if (cc != PAGE_SIZE) {
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/* Try to read the page from the executable. */
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if (lseek(efd, (off_t)addr + delta, SEEK_SET) == -1)
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err(1, "seek executable: %s", strerror(errno));
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cc = read(efd, buffer, sizeof(buffer));
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if (cc != sizeof(buffer)) {
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if (cc < 0)
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err(1, "read executable");
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else /* Assume untouched bss page. */
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bzero(buffer, sizeof(buffer));
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}
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}
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cc = write(fd, buffer, PAGE_SIZE);
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if (cc != PAGE_SIZE)
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errx(1, "write data segment: %s",
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cc > 0 ? strerror(EIO) : strerror(errno));
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addr += PAGE_SIZE;
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}
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}
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static void
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killed(sig)
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int sig;
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{
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restart_target();
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signal(sig, SIG_DFL);
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kill(getpid(), sig);
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}
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static void
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restart_target()
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{
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kill(pid, SIGCONT);
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}
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void
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userdump(fd, kp, addr, npage)
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register int fd;
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struct kinfo_proc *kp;
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register u_long addr;
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register int npage;
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{
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register int cc;
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char buffer[PAGE_SIZE];
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while (--npage >= 0) {
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cc = kvm_uread(kd, kp, addr, buffer, PAGE_SIZE);
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if (cc != PAGE_SIZE)
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/* Could be an untouched fill-with-zero page. */
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bzero(buffer, PAGE_SIZE);
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cc = write(fd, buffer, PAGE_SIZE);
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if (cc != PAGE_SIZE)
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errx(1, "write stack segment: %s",
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cc > 0 ? strerror(EIO) : strerror(errno));
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addr += PAGE_SIZE;
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}
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}
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void
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usage()
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{
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(void)fprintf(stderr, "usage: gcore [-s] [-c core] executable pid\n");
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exit(1);
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}
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