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 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 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