c4dd6db19b
1) Remove some unused variables. 2) Mark some things aas static or __unused. 3) Cast to make sure we're comparing the same types.
242 lines
6.9 KiB
C
242 lines
6.9 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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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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/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 <sys/linker_set.h>
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#include <arpa/inet.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 datadump(int, int, struct kinfo_proc *, u_long, int);
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static void userdump(int, struct kinfo_proc *, u_long, int);
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static kvm_t *kd;
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static int data_offset;
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static struct kinfo_proc *ki;
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static int
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aoutident(int efd, pid_t pid, char *binfile)
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{
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struct exec exec;
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int cnt;
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uid_t uid;
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char errbuf[_POSIX2_LINE_MAX];
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cnt = read(efd, &exec, sizeof(exec));
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if (cnt != sizeof(exec))
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return (0);
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if (!N_BADMAG(exec)) {
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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 != (unsigned long)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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return (1);
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}
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return (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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static void
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aoutcore(int efd, int fd, pid_t pid __unused)
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{
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union {
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struct user user;
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struct {
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char uabytes[ctob(UAREA_PAGES)];
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char ksbytes[ctob(KSTACK_PAGES)];
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} bytes;
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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.bytes.uabytes,
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ctob(UAREA_PAGES));
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if (cnt != ctob(UAREA_PAGES))
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errx(1, "read upages structure: %s",
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cnt > 0 ? strerror(EIO) : strerror(errno));
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cnt = kvm_read(kd, (u_long)ki->ki_kstack, uarea.bytes.ksbytes,
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ctob(KSTACK_PAGES));
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if (cnt != ctob(KSTACK_PAGES))
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errx(1, "read kstack 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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}
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void
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datadump(int efd, int fd, struct kinfo_proc *kp, u_long addr, int npage)
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{
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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");
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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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void
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userdump(int fd, struct kinfo_proc *kp, u_long addr, int npage)
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{
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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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struct dumpers aoutdump = { aoutident, aoutcore };
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TEXT_SET(dumpset, aoutdump);
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