2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#) Copyright (c) 1992, 1993 The Regents of the University of California. All rights reserved.
34 * @(#)gcore.c 8.2 (Berkeley) 9/23/93
35 * $FreeBSD: src/usr.bin/gcore/gcore.c,v 1.15.2.2 2001/08/17 20:56:22 mikeh Exp $
36 * $DragonFly: src/usr.bin/gcore/gcore.c,v 1.4 2003/10/04 20:36:45 hmp Exp $
40 * Originally written by Eric Cooper in Fall 1981.
41 * Inspired by a version 6 program by Len Levin, 1978.
42 * Several pieces of code lifted from Bill Joy's 4BSD ps.
43 * Most recently, hacked beyond recognition for 4.4BSD by Steven McCanne,
44 * Lawrence Berkeley Laboratory.
46 * Portions of this software were developed by the Computer Systems
47 * Engineering group at Lawrence Berkeley Laboratory under DARPA
48 * contract BG 91-66 and contributed to Berkeley.
50 #include <sys/param.h>
55 #include <sys/sysctl.h>
56 #include <machine/elf.h>
58 #include <machine/vmparam.h>
73 static void core(int, int, struct kinfo_proc *);
74 static void datadump(int, int, struct proc *, u_long, int);
75 static void killed(int);
76 static void restart_target(void);
77 static void usage(void) __dead2;
78 static void userdump(int, struct proc *, u_long, int);
81 /* XXX undocumented routine, should be in kvm.h? */
82 ssize_t kvm_uread __P((kvm_t *, const struct proc *, u_long, char *, size_t));
84 static int data_offset;
88 main(int argc, char **argv)
90 register struct proc *p;
91 struct kinfo_proc *ki = NULL;
93 int ch, cnt, efd, fd, sflag, uid;
94 char *binfile, *corefile;
95 char errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN + 1];
100 while ((ch = getopt(argc, argv, "c:s")) != -1) {
116 /* XXX we should check that the pid argument is really a number */
120 asprintf(&binfile, "/proc/%d/file", pid);
122 errx(1, "allocation failure");
132 efd = open(binfile, O_RDONLY, 0);
134 err(1, "%s", binfile);
136 cnt = read(efd, &exec, sizeof(exec));
137 if (cnt != sizeof(exec))
138 errx(1, "%s exec header: %s",
139 binfile, cnt > 0 ? strerror(EIO) : strerror(errno));
140 if (!N_BADMAG(exec)) {
143 * This legacy a.out support uses the kvm interface instead
146 kd = kvm_openfiles(0, 0, 0, O_RDONLY, errbuf);
148 errx(1, "%s", errbuf);
152 ki = kvm_getprocs(kd, KERN_PROC_PID, pid, &cnt);
153 if (ki == NULL || cnt != 1)
154 errx(1, "%d: not found", pid);
157 if (ki->kp_eproc.e_ucred.cr_ruid != uid && uid != 0)
158 errx(1, "%d: not owner", pid);
160 if (p->p_stat == SZOMB)
161 errx(1, "%d: zombie", pid);
163 if (p->p_flag & P_WEXIT)
164 errx(1, "%d: process exiting", pid);
165 if (p->p_flag & P_SYSTEM) /* Swapper or pagedaemon. */
166 errx(1, "%d: system process", pid);
167 if (exec.a_text != ptoa(ki->kp_eproc.e_vm.vm_tsize))
168 errx(1, "The executable %s does not belong to"
170 "Text segment size (in bytes): executable %ld,"
171 " process %d", binfile, pid, exec.a_text,
172 ptoa(ki->kp_eproc.e_vm.vm_tsize));
173 data_offset = N_DATOFF(exec);
174 } else if (IS_ELF(*(Elf_Ehdr *)&exec)) {
178 errx(1, "Invalid executable file");
180 if (corefile == NULL) {
181 (void)snprintf(fname, sizeof(fname), "core.%d", pid);
184 fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE);
186 err(1, "%s", corefile);
189 signal(SIGHUP, killed);
190 signal(SIGINT, killed);
191 signal(SIGTERM, killed);
192 if (kill(pid, SIGSTOP) == -1)
193 err(1, "%d: stop signal", pid);
194 atexit(restart_target);
200 elf_coredump(fd, pid);
208 * Build the core file.
211 core(int efd, int fd, struct kinfo_proc *ki)
215 char ubytes[ctob(UPAGES)];
217 struct proc *p = &ki->kp_proc;
218 int tsize = ki->kp_eproc.e_vm.vm_tsize;
219 int dsize = ki->kp_eproc.e_vm.vm_dsize;
220 int ssize = ki->kp_eproc.e_vm.vm_ssize;
223 /* Read in user struct */
224 cnt = kvm_read(kd, (u_long)p->p_addr, &uarea, sizeof(uarea));
225 if (cnt != sizeof(uarea))
226 errx(1, "read user structure: %s",
227 cnt > 0 ? strerror(EIO) : strerror(errno));
230 * Fill in the eproc vm parameters, since these are garbage unless
231 * the kernel is dumping core or something.
233 uarea.user.u_kproc = *ki;
236 cnt = write(fd, &uarea, sizeof(uarea));
237 if (cnt != sizeof(uarea))
238 errx(1, "write user structure: %s",
239 cnt > 0 ? strerror(EIO) : strerror(errno));
241 /* Dump data segment */
242 datadump(efd, fd, p, USRTEXT + ctob(tsize), dsize);
244 /* Dump stack segment */
245 userdump(fd, p, USRSTACK - ctob(ssize), ssize);
247 /* Dump machine dependent portions of the core. */
252 datadump(register int efd, register int fd, struct proc *p,
253 register u_long addr, register int npage)
255 register int cc, delta;
256 char buffer[PAGE_SIZE];
258 delta = data_offset - addr;
259 while (--npage >= 0) {
260 cc = kvm_uread(kd, p, addr, buffer, PAGE_SIZE);
261 if (cc != PAGE_SIZE) {
262 /* Try to read the page from the executable. */
263 if (lseek(efd, (off_t)addr + delta, SEEK_SET) == -1)
264 err(1, "seek executable: %s", strerror(errno));
265 cc = read(efd, buffer, sizeof(buffer));
266 if (cc != sizeof(buffer)) {
268 err(1, "read executable");
269 else /* Assume untouched bss page. */
270 bzero(buffer, sizeof(buffer));
273 cc = write(fd, buffer, PAGE_SIZE);
275 errx(1, "write data segment: %s",
276 cc > 0 ? strerror(EIO) : strerror(errno));
285 signal(sig, SIG_DFL);
296 userdump(register int fd, struct proc *p, register u_long addr,
300 char buffer[PAGE_SIZE];
302 while (--npage >= 0) {
303 cc = kvm_uread(kd, p, addr, buffer, PAGE_SIZE);
305 /* Could be an untouched fill-with-zero page. */
306 bzero(buffer, PAGE_SIZE);
307 cc = write(fd, buffer, PAGE_SIZE);
309 errx(1, "write stack segment: %s",
310 cc > 0 ? strerror(EIO) : strerror(errno));
318 (void)fprintf(stderr, "usage: gcore [-s] [-c core] [executable] pid\n");