gcore.c revision 199805 
1/*-
2 * Copyright (c) 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
20 *
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
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1992, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#if 0
41#ifndef lint
42static char sccsid[] = "@(#)gcore.c	8.2 (Berkeley) 9/23/93";
43#endif /* not lint */
44#endif
45#include <sys/cdefs.h>
46__FBSDID("$FreeBSD: head/usr.bin/gcore/gcore.c 199805 2009-11-25 15:23:14Z attilio $");
47
48/*
49 * Originally written by Eric Cooper in Fall 1981.
50 * Inspired by a version 6 program by Len Levin, 1978.
51 * Several pieces of code lifted from Bill Joy's 4BSD ps.
52 * Most recently, hacked beyond recognition for 4.4BSD by Steven McCanne,
53 * Lawrence Berkeley Laboratory.
54 *
55 * Portions of this software were developed by the Computer Systems
56 * Engineering group at Lawrence Berkeley Laboratory under DARPA
57 * contract BG 91-66 and contributed to Berkeley.
58 */
59
60#include <sys/param.h>
61#include <sys/time.h>
62#include <sys/stat.h>
63#include <sys/linker_set.h>
64#include <sys/sysctl.h>
65
66#include <err.h>
67#include <fcntl.h>
68#include <signal.h>
69#include <stdio.h>
70#include <stdlib.h>
71#include <string.h>
72#include <unistd.h>
73
74#include "extern.h"
75
76static void	killed(int);
77static void	restart_target(void);
78static void	usage(void) __dead2;
79
80static pid_t pid;
81
82SET_DECLARE(dumpset, struct dumpers);
83
84int
85main(int argc, char *argv[])
86{
87	int ch, efd, fd, name[4], sflag;
88	char *binfile, *corefile;
89	char passpath[MAXPATHLEN], fname[MAXPATHLEN];
90	struct dumpers **d, *dumper;
91	size_t len;
92
93	sflag = 0;
94	corefile = NULL;
95        while ((ch = getopt(argc, argv, "c:s")) != -1) {
96                switch (ch) {
97                case 'c':
98			corefile = optarg;
99                        break;
100		case 's':
101			sflag = 1;
102			break;
103		default:
104			usage();
105			break;
106		}
107	}
108	argv += optind;
109	argc -= optind;
110	/* XXX we should check that the pid argument is really a number */
111	switch (argc) {
112	case 1:
113		pid = atoi(argv[0]);
114		name[0] = CTL_KERN;
115		name[1] = KERN_PROC;
116		name[2] = KERN_PROC_PATHNAME;
117		name[3] = pid;
118		len = sizeof(passpath);
119		if (sysctl(name, 4, passpath, &len, NULL, 0) == -1)
120			errx(1, "kern.proc.pathname failure");
121		binfile = passpath;
122		break;
123	case 2:
124		pid = atoi(argv[1]);
125		binfile = argv[0];
126		break;
127	default:
128		usage();
129	}
130	efd = open(binfile, O_RDONLY, 0);
131	if (efd < 0)
132		err(1, "%s", binfile);
133	dumper = NULL;
134	SET_FOREACH(d, dumpset) {
135		lseek(efd, 0, SEEK_SET);
136		if (((*d)->ident)(efd, pid, binfile)) {
137			dumper = (*d);
138			lseek(efd, 0, SEEK_SET);
139			break;
140		}
141	}
142	if (dumper == NULL)
143		errx(1, "Invalid executable file");
144	if (corefile == NULL) {
145		(void)snprintf(fname, sizeof(fname), "core.%d", pid);
146		corefile = fname;
147	}
148	fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE);
149	if (fd < 0)
150		err(1, "%s", corefile);
151	if (sflag) {
152		signal(SIGHUP, killed);
153		signal(SIGINT, killed);
154		signal(SIGTERM, killed);
155		if (kill(pid, SIGSTOP) == -1)
156			err(1, "%d: stop signal", pid);
157		atexit(restart_target);
158	}
159	dumper->dump(efd, fd, pid);
160	(void)close(fd);
161	(void)close(efd);
162	exit(0);
163}
164
165static void
166killed(int sig)
167{
168
169	restart_target();
170	signal(sig, SIG_DFL);
171	kill(getpid(), sig);
172}
173
174static void
175restart_target(void)
176{
177
178	kill(pid, SIGCONT);
179}
180
181void
182usage(void)
183{
184
185	(void)fprintf(stderr, "usage: gcore [-s] [-c core] [executable] pid\n");
186	exit(1);
187}
188