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 * 4. 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
30 #ifndef lint
31 static const char copyright[] =
32 "@(#) Copyright (c) 1992, 1993\n\
33 The Regents of the University of California. All rights reserved.\n";
34 #endif /* not lint */
35
36 #if 0
37 #ifndef lint
38 static char sccsid[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93";
39 #endif /* not lint */
40 #endif
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
43
44 /*
45 * Originally written by Eric Cooper in Fall 1981.
46 * Inspired by a version 6 program by Len Levin, 1978.
47 * Several pieces of code lifted from Bill Joy's 4BSD ps.
48 * Most recently, hacked beyond recognition for 4.4BSD by Steven McCanne,
49 * Lawrence Berkeley Laboratory.
50 *
51 * Portions of this software were developed by the Computer Systems
52 * Engineering group at Lawrence Berkeley Laboratory under DARPA
53 * contract BG 91-66 and contributed to Berkeley.
54 */
55
56 #include <sys/param.h>
57 #include <sys/time.h>
58 #include <sys/stat.h>
59 #include <sys/linker_set.h>
60 #include <sys/sysctl.h>
61
62 #include <err.h>
63 #include <fcntl.h>
64 #include <stdio.h>
65 #include <stdlib.h>
66 #include <string.h>
67 #include <unistd.h>
68
69 #include "extern.h"
70 int pflags;
71
72 static void killed(int);
73 static void usage(void) __dead2;
74
75 static pid_t pid;
76
77 SET_DECLARE(dumpset, struct dumpers);
78
79 int
main(int argc,char * argv[])80 main(int argc, char *argv[])
81 {
82 int ch, efd, fd, name[4];
83 char *binfile, *corefile;
84 char passpath[MAXPATHLEN], fname[MAXPATHLEN];
85 struct dumpers **d, *dumper;
86 size_t len;
87
88 pflags = 0;
89 corefile = NULL;
90 while ((ch = getopt(argc, argv, "c:fs")) != -1) {
91 switch (ch) {
92 case 'c':
93 corefile = optarg;
94 break;
95 case 'f':
96 pflags |= PFLAGS_FULL;
97 break;
98 case 's':
99 pflags |= PFLAGS_RESUME;
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 name[0] = CTL_KERN;
113 name[1] = KERN_PROC;
114 name[2] = KERN_PROC_PATHNAME;
115 name[3] = pid;
116 len = sizeof(passpath);
117 if (sysctl(name, 4, passpath, &len, NULL, 0) == -1)
118 errx(1, "kern.proc.pathname failure");
119 binfile = passpath;
120 break;
121 case 2:
122 pid = atoi(argv[1]);
123 binfile = argv[0];
124 break;
125 default:
126 usage();
127 }
128 efd = open(binfile, O_RDONLY, 0);
129 if (efd < 0)
130 err(1, "%s", binfile);
131 dumper = NULL;
132 SET_FOREACH(d, dumpset) {
133 lseek(efd, 0, SEEK_SET);
134 if (((*d)->ident)(efd, pid, binfile)) {
135 dumper = (*d);
136 lseek(efd, 0, SEEK_SET);
137 break;
138 }
139 }
140 if (dumper == NULL)
141 errx(1, "Invalid executable file");
142 if (corefile == NULL) {
143 (void)snprintf(fname, sizeof(fname), "core.%d", pid);
144 corefile = fname;
145 }
146 fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE);
147 if (fd < 0)
148 err(1, "%s", corefile);
149 /*
150 * The semantics of the 's' flag is to stop the target process.
151 * Previous versions of gcore would manage this by trapping SIGHUP,
152 * SIGINT and SIGTERM (to be passed to the target pid), and then
153 * signal the child to stop.
154 *
155 * However, this messes up if the selected dumper uses ptrace calls
156 * that leave the child already stopped. The waitpid call in elfcore
157 * never returns.
158 *
159 * The best thing to do here is to externalize the 's' flag and let
160 * each dumper dispose of what that means, if anything. For the elfcore
161 * dumper, the 's' flag is a no-op since the ptrace attach stops the
162 * process in question already.
163 */
164
165 dumper->dump(efd, fd, pid);
166 (void)close(fd);
167 (void)close(efd);
168 exit(0);
169 }
170
171 void
usage(void)172 usage(void)
173 {
174
175 (void)fprintf(stderr, "usage: gcore [-s] [-c core] [executable] pid\n");
176 exit(1);
177 }
178