1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 static const char copyright[] = 34 "@(#) Copyright (c) 1992, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"; 36 #endif /* not lint */ 37 38 #if 0 39 #ifndef lint 40 static char sccsid[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93"; 41 #endif /* not lint */ 42 #endif 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 /* 47 * Originally written by Eric Cooper in Fall 1981. 48 * Inspired by a version 6 program by Len Levin, 1978. 49 * Several pieces of code lifted from Bill Joy's 4BSD ps. 50 * Most recently, hacked beyond recognition for 4.4BSD by Steven McCanne, 51 * Lawrence Berkeley Laboratory. 52 * 53 * Portions of this software were developed by the Computer Systems 54 * Engineering group at Lawrence Berkeley Laboratory under DARPA 55 * contract BG 91-66 and contributed to Berkeley. 56 */ 57 58 #include <sys/param.h> 59 #include <sys/ptrace.h> 60 #include <sys/time.h> 61 #include <sys/stat.h> 62 #include <sys/linker_set.h> 63 #include <sys/sysctl.h> 64 #include <sys/wait.h> 65 66 #include <err.h> 67 #include <fcntl.h> 68 #include <stdbool.h> 69 #include <stdio.h> 70 #include <stdlib.h> 71 #include <string.h> 72 #include <unistd.h> 73 74 #include "extern.h" 75 int pflags; 76 77 static void killed(int); 78 static void usage(void) __dead2; 79 80 static pid_t pid; 81 static bool kflag = false; 82 83 SET_DECLARE(dumpset, struct dumpers); 84 85 static int 86 open_corefile(char *corefile) 87 { 88 char fname[MAXPATHLEN]; 89 int fd; 90 91 if (corefile == NULL) { 92 (void)snprintf(fname, sizeof(fname), "core.%d", pid); 93 corefile = fname; 94 } 95 fd = open(corefile, O_RDWR | O_CREAT | O_TRUNC, DEFFILEMODE); 96 if (fd < 0) 97 err(1, "%s", corefile); 98 return (fd); 99 } 100 101 static void 102 kcoredump(int fd, pid_t pid) 103 { 104 struct ptrace_coredump pc; 105 int error, res, ret, waited; 106 107 error = ptrace(PT_ATTACH, pid, NULL, 0); 108 if (error != 0) 109 err(1, "attach"); 110 111 waited = waitpid(pid, &res, 0); 112 if (waited == -1) 113 err(1, "wait for STOP"); 114 115 ret = 0; 116 memset(&pc, 0, sizeof(pc)); 117 pc.pc_fd = fd; 118 pc.pc_flags = (pflags & PFLAGS_FULL) != 0 ? PC_ALL : 0; 119 error = ptrace(PT_COREDUMP, pid, (void *)&pc, sizeof(pc)); 120 if (error == -1) { 121 warn("coredump"); 122 ret = 1; 123 } 124 125 waited = waitpid(pid, &res, WNOHANG); 126 if (waited == -1) { 127 warn("wait after coredump"); 128 ret = 1; 129 } 130 131 error = ptrace(PT_DETACH, pid, NULL, 0); 132 if (error == -1) { 133 warn("detach failed, check process status"); 134 ret = 1; 135 } 136 137 exit(ret); 138 } 139 140 int 141 main(int argc, char *argv[]) 142 { 143 int ch, efd, fd, name[4]; 144 char *binfile, *corefile; 145 char passpath[MAXPATHLEN]; 146 struct dumpers **d, *dumper; 147 size_t len; 148 149 pflags = 0; 150 corefile = NULL; 151 while ((ch = getopt(argc, argv, "c:fk")) != -1) { 152 switch (ch) { 153 case 'c': 154 corefile = optarg; 155 break; 156 case 'f': 157 pflags |= PFLAGS_FULL; 158 break; 159 case 'k': 160 kflag = true; 161 break; 162 default: 163 usage(); 164 break; 165 } 166 } 167 argv += optind; 168 argc -= optind; 169 170 /* XXX we should check that the pid argument is really a number */ 171 switch (argc) { 172 case 1: 173 pid = atoi(argv[0]); 174 break; 175 case 2: 176 binfile = argv[0]; 177 pid = atoi(argv[1]); 178 break; 179 default: 180 usage(); 181 } 182 183 if (kflag) { 184 fd = open_corefile(corefile); 185 kcoredump(fd, pid); 186 } 187 188 if (argc == 1) { 189 name[0] = CTL_KERN; 190 name[1] = KERN_PROC; 191 name[2] = KERN_PROC_PATHNAME; 192 name[3] = pid; 193 len = sizeof(passpath); 194 if (sysctl(name, 4, passpath, &len, NULL, 0) == -1) 195 errx(1, "kern.proc.pathname failure"); 196 binfile = passpath; 197 } 198 efd = open(binfile, O_RDONLY, 0); 199 if (efd < 0) 200 err(1, "%s", binfile); 201 dumper = NULL; 202 SET_FOREACH(d, dumpset) { 203 lseek(efd, 0, SEEK_SET); 204 if (((*d)->ident)(efd, pid, binfile)) { 205 dumper = (*d); 206 lseek(efd, 0, SEEK_SET); 207 break; 208 } 209 } 210 if (dumper == NULL) 211 errx(1, "Invalid executable file"); 212 fd = open_corefile(corefile); 213 214 dumper->dump(efd, fd, pid); 215 (void)close(fd); 216 (void)close(efd); 217 exit(0); 218 } 219 220 void 221 usage(void) 222 { 223 224 (void)fprintf(stderr, 225 "usage: gcore [-kf] [-c core] [executable] pid\n"); 226 exit(1); 227 } 228