1 /* $NetBSD: gcore.c,v 1.12 2019/02/01 08:29:04 mrg Exp $ */
2
3 /*-
4 * Copyright (c) 2003 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __RCSID("$NetBSD: gcore.c,v 1.12 2019/02/01 08:29:04 mrg Exp $");
34
35 #include <sys/types.h>
36 #include <sys/param.h>
37 #include <sys/time.h>
38 #include <sys/ptrace.h>
39 #include <sys/proc.h>
40 #include <sys/wait.h>
41
42 #include <stdio.h>
43 #include <string.h>
44 #include <err.h>
45 #include <limits.h>
46 #include <stdlib.h>
47 #include <unistd.h>
48 #include <errno.h>
49
50 static void usage(void) __dead;
51
52 static void
usage(void)53 usage(void)
54 {
55 (void)fprintf(stderr, "Usage: %s [-c <corename>] <pid> [<pid> ...]\n",
56 getprogname());
57 exit(1);
58 }
59
60
61 int
main(int argc,char ** argv)62 main(int argc, char **argv)
63 {
64 int c;
65 char *corename = NULL;
66 int corelen = 0;
67
68 while ((c = getopt(argc, argv, "c:")) != -1)
69 switch (c) {
70 case 'c':
71 corename = optarg;
72 corelen = strlen(corename);
73 break;
74 case '?':
75 default:
76 usage();
77 /*NOTREACHED*/
78 }
79
80 if (optind == argc)
81 usage();
82
83 for (c = optind; c < argc; c++) {
84 char *ep;
85 u_long lval;
86 int status, serrno;
87 pid_t pid, cpid;
88
89 errno = 0;
90 lval = strtoul(argv[c], &ep, 0);
91 if (argv[c] == NULL || *ep)
92 errx(1, "`%s' is not a number.", argv[c]);
93
94 if (errno == ERANGE && lval == ULONG_MAX)
95 err(1, "Pid `%s'", argv[c]);
96
97 pid = (pid_t)lval;
98
99 if (ptrace(PT_ATTACH, pid, 0, 0) == -1)
100 err(1, "ptrace(PT_ATTACH) to %lu failed", lval);
101
102 if ((cpid = waitpid(pid, &status, 0)) != pid) {
103 serrno = errno;
104 (void)ptrace(PT_DETACH, pid, (void *)1, 0);
105 errno = serrno;
106 if (cpid == -1)
107 err(1, "Cannot wait for %lu", lval);
108 else
109 errx(1, "Unexpected process %lu waited",
110 (unsigned long)cpid);
111 }
112
113 if (ptrace(PT_DUMPCORE, pid, corename, corelen) == -1) {
114 serrno = errno;
115 (void)ptrace(PT_DETACH, pid, (void *)1, 0);
116 errno = serrno;
117 err(1, "ptrace(PT_DUMPCORE) to %lu failed", lval);
118 }
119 if (ptrace(PT_DETACH, pid, (void *)1, 0) == -1)
120 err(1, "ptrace(PT_DETACH) to %lu failed", lval);
121 }
122 return 0;
123 }
124