1 /*-
2 * Copyright (c) 1992, 1993, 2019
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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#) Copyright (c) 1992, 1993 The Regents of the University of California. All rights reserved.
30 * @(#)gcore.c 8.2 (Berkeley) 9/23/93
31 * $FreeBSD: src/usr.bin/gcore/gcore.c,v 1.15.2.2 2001/08/17 20:56:22 mikeh Exp $
32 */
33
34 /*
35 * Originally written by Eric Cooper in Fall 1981.
36 * Inspired by a version 6 program by Len Levin, 1978.
37 * Several pieces of code lifted from Bill Joy's 4BSD ps.
38 * Most recently, hacked beyond recognition for 4.4BSD by Steven McCanne,
39 * Lawrence Berkeley Laboratory.
40 *
41 * Portions of this software were developed by the Computer Systems
42 * Engineering group at Lawrence Berkeley Laboratory under DARPA
43 * contract BG 91-66 and contributed to Berkeley.
44 */
45 #include <sys/param.h>
46 #include <sys/time.h>
47 #include <sys/stat.h>
48 #include <sys/sysctl.h>
49 #include <machine/elf.h>
50
51 #include <machine/vmparam.h>
52
53 #include <err.h>
54 #include <errno.h>
55 #include <fcntl.h>
56 #include <kvm.h>
57 #include <limits.h>
58 #include <signal.h>
59 #include <stdio.h>
60 #include <stdlib.h>
61 #include <string.h>
62 #include <unistd.h>
63
64 #include "extern.h"
65
66 static void killed(int);
67 static void restart_target(void);
68 static void usage(void) __dead2;
69
70 kvm_t *kd;
71
72 static pid_t pid;
73 ssize_t gcore_seg_limit = -1;
74 int gcore_verbose;
75
76 int
main(int argc,char ** argv)77 main(int argc, char **argv)
78 {
79 void *exec;
80 int ch, cnt, efd, fd, sflag;
81 char *binfile, *corefile;
82 char *eptr;
83 char fname[MAXPATHLEN + 1];
84
85 sflag = 0;
86 corefile = NULL;
87 while ((ch = getopt(argc, argv, "c:l:sv")) != -1) {
88 switch (ch) {
89 case 'c':
90 corefile = optarg;
91 break;
92 case 'l':
93 gcore_seg_limit = strtol(optarg, &eptr, 0);
94 switch(*eptr) {
95 case 0:
96 break;
97 case 't':
98 case 'T':
99 gcore_seg_limit *= 1024;
100 /* fall through */
101 case 'g':
102 case 'G':
103 gcore_seg_limit *= 1024;
104 /* fall through */
105 case 'm':
106 case 'M':
107 gcore_seg_limit *= 1024;
108 /* fall through */
109 case 'k':
110 case 'K':
111 gcore_seg_limit *= 1024;
112 break;
113 default:
114 usage();
115 break;
116 }
117 break;
118 case 's':
119 sflag = 1;
120 break;
121 case 'v':
122 gcore_verbose = 1;
123 break;
124 default:
125 usage();
126 break;
127 }
128 }
129 argv += optind;
130 argc -= optind;
131
132 /* XXX we should check that the pid argument is really a number */
133 switch (argc) {
134 case 1:
135 pid = atoi(argv[0]);
136 asprintf(&binfile, "/proc/%d/file", pid);
137 if (binfile == NULL)
138 errx(1, "allocation failure");
139 break;
140 case 2:
141 pid = atoi(argv[1]);
142 binfile = argv[0];
143 break;
144 default:
145 usage();
146 }
147
148 efd = open(binfile, O_RDONLY, 0);
149 if (efd < 0)
150 err(1, "%s", binfile);
151
152 cnt = read(efd, &exec, sizeof(Elf_Ehdr));
153 if (cnt != sizeof(Elf_Ehdr))
154 errx(1, "%s exec header: %s",
155 binfile, cnt > 0 ? strerror(EIO) : strerror(errno));
156 if (IS_ELF(*(Elf_Ehdr *)&exec)) {
157 close(efd);
158 } else
159 errx(1, "Invalid executable file");
160
161 if (corefile == NULL) {
162 snprintf(fname, sizeof(fname), "core.%d", pid);
163 corefile = fname;
164 }
165 fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE);
166 if (fd < 0)
167 err(1, "%s", corefile);
168
169 if (sflag) {
170 signal(SIGHUP, killed);
171 signal(SIGINT, killed);
172 signal(SIGTERM, killed);
173 if (kill(pid, SIGSTOP) == -1)
174 err(1, "%d: stop signal", pid);
175 atexit(restart_target);
176 }
177
178 elf_coredump(fd, pid);
179
180 close(fd);
181 exit(0);
182 }
183
184 static void
killed(int sig)185 killed(int sig)
186 {
187 restart_target();
188 signal(sig, SIG_DFL);
189 kill(getpid(), sig);
190 }
191
192 static void
restart_target(void)193 restart_target(void)
194 {
195 kill(pid, SIGCONT);
196 }
197
198 void
usage(void)199 usage(void)
200 {
201 fprintf(stderr,
202 "usage: gcore [-sv] [-c core] [-l seglimit] [executable] pid\n");
203 exit(1);
204 }
205