1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifndef lint
33static const char copyright[] =
34"@(#) Copyright (c) 1992, 1993\n\
35	The Regents of the University of California.  All rights reserved.\n";
36#endif /* not lint */
37
38#if 0
39#ifndef lint
40static char sccsid[] = "@(#)gcore.c	8.2 (Berkeley) 9/23/93";
41#endif /* not lint */
42#endif
43#include <sys/cdefs.h>
44__FBSDID("$FreeBSD$");
45
46/*
47 * Originally written by Eric Cooper in Fall 1981.
48 * Inspired by a version 6 program by Len Levin, 1978.
49 * Several pieces of code lifted from Bill Joy's 4BSD ps.
50 * Most recently, hacked beyond recognition for 4.4BSD by Steven McCanne,
51 * Lawrence Berkeley Laboratory.
52 *
53 * Portions of this software were developed by the Computer Systems
54 * Engineering group at Lawrence Berkeley Laboratory under DARPA
55 * contract BG 91-66 and contributed to Berkeley.
56 */
57
58#include <sys/param.h>
59#include <sys/time.h>
60#include <sys/stat.h>
61#include <sys/linker_set.h>
62#include <sys/sysctl.h>
63
64#include <err.h>
65#include <fcntl.h>
66#include <stdio.h>
67#include <stdlib.h>
68#include <string.h>
69#include <unistd.h>
70
71#include "extern.h"
72int pflags;
73
74static void	killed(int);
75static void	usage(void) __dead2;
76
77static pid_t pid;
78
79SET_DECLARE(dumpset, struct dumpers);
80
81int
82main(int argc, char *argv[])
83{
84	int ch, efd, fd, name[4];
85	char *binfile, *corefile;
86	char passpath[MAXPATHLEN], fname[MAXPATHLEN];
87	struct dumpers **d, *dumper;
88	size_t len;
89
90	pflags = 0;
91	corefile = NULL;
92        while ((ch = getopt(argc, argv, "c:f")) != -1) {
93                switch (ch) {
94                case 'c':
95			corefile = optarg;
96                        break;
97		case 'f':
98			pflags |= PFLAGS_FULL;
99			break;
100		default:
101			usage();
102			break;
103		}
104	}
105	argv += optind;
106	argc -= optind;
107	/* XXX we should check that the pid argument is really a number */
108	switch (argc) {
109	case 1:
110		pid = atoi(argv[0]);
111		name[0] = CTL_KERN;
112		name[1] = KERN_PROC;
113		name[2] = KERN_PROC_PATHNAME;
114		name[3] = pid;
115		len = sizeof(passpath);
116		if (sysctl(name, 4, passpath, &len, NULL, 0) == -1)
117			errx(1, "kern.proc.pathname failure");
118		binfile = passpath;
119		break;
120	case 2:
121		pid = atoi(argv[1]);
122		binfile = argv[0];
123		break;
124	default:
125		usage();
126	}
127	efd = open(binfile, O_RDONLY, 0);
128	if (efd < 0)
129		err(1, "%s", binfile);
130	dumper = NULL;
131	SET_FOREACH(d, dumpset) {
132		lseek(efd, 0, SEEK_SET);
133		if (((*d)->ident)(efd, pid, binfile)) {
134			dumper = (*d);
135			lseek(efd, 0, SEEK_SET);
136			break;
137		}
138	}
139	if (dumper == NULL)
140		errx(1, "Invalid executable file");
141	if (corefile == NULL) {
142		(void)snprintf(fname, sizeof(fname), "core.%d", pid);
143		corefile = fname;
144	}
145	fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE);
146	if (fd < 0)
147		err(1, "%s", corefile);
148
149	dumper->dump(efd, fd, pid);
150	(void)close(fd);
151	(void)close(efd);
152	exit(0);
153}
154
155void
156usage(void)
157{
158
159	(void)fprintf(stderr, "usage: gcore [-c core] [executable] pid\n");
160	exit(1);
161}
162