gcore.c revision 103299 
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 103299 2002-09-13 16:33:35Z peter $");
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
65#include <err.h>
66#include <fcntl.h>
67#include <signal.h>
68#include <stdio.h>
69#include <stdlib.h>
70#include <string.h>
71#include <unistd.h>
72
73#include "extern.h"
74
75static void	killed(int);
76static void	restart_target(void);
77static void	usage(void) __dead2;
78
79static pid_t pid;
80
81SET_DECLARE(dumpset, struct dumpers);
82
83int
84main(int argc, char *argv[])
85{
86	int ch, cnt, efd, fd, sflag;
87	char *binfile, *corefile;
88	char fname[MAXPATHLEN];
89	struct dumpers **d, *dumper;
90
91	sflag = 0;
92	corefile = NULL;
93        while ((ch = getopt(argc, argv, "c:s")) != -1) {
94                switch (ch) {
95                case 'c':
96			corefile = optarg;
97                        break;
98		case 's':
99			sflag = 1;
100			break;
101		default:
102			usage();
103			break;
104		}
105	}
106	argv += optind;
107	argc -= optind;
108	/* XXX we should check that the pid argument is really a number */
109	switch (argc) {
110	case 1:
111		pid = atoi(argv[0]);
112		asprintf(&binfile, "/proc/%d/file", pid);
113		if (binfile == NULL)
114			errx(1, "allocation failure");
115		break;
116	case 2:
117		pid = atoi(argv[1]);
118		binfile = argv[0];
119		break;
120	default:
121		usage();
122	}
123	efd = open(binfile, O_RDONLY, 0);
124	if (efd < 0)
125		err(1, "%s", binfile);
126	dumper = NULL;
127	SET_FOREACH(d, dumpset) {
128		lseek(efd, 0, SEEK_SET);
129		if (((*d)->ident)(efd, pid, binfile)) {
130			dumper = (*d);
131			lseek(efd, 0, SEEK_SET);
132			break;
133		}
134	}
135	if (dumper == NULL)
136		errx(1, "Invalid executable file");
137	if (corefile == NULL) {
138		(void)snprintf(fname, sizeof(fname), "core.%d", pid);
139		corefile = fname;
140	}
141	fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE);
142	if (fd < 0)
143		err(1, "%s", corefile);
144	if (sflag) {
145		signal(SIGHUP, killed);
146		signal(SIGINT, killed);
147		signal(SIGTERM, killed);
148		if (kill(pid, SIGSTOP) == -1)
149			err(1, "%d: stop signal", pid);
150		atexit(restart_target);
151	}
152	dumper->dump(efd, fd, pid);
153	(void)close(fd);
154	(void)close(efd);
155	exit(0);
156}
157
158static void
159killed(int sig)
160{
161
162	restart_target();
163	signal(sig, SIG_DFL);
164	kill(getpid(), sig);
165}
166
167static void
168restart_target(void)
169{
170
171	kill(pid, SIGCONT);
172}
173
174void
175usage(void)
176{
177
178	(void)fprintf(stderr, "usage: gcore [-s] [-c core] [executable] pid\n");
179	exit(1);
180}
181