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 /* 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/ptrace.h> 58 #include <sys/time.h> 59 #include <sys/stat.h> 60 #include <sys/linker_set.h> 61 #include <sys/sysctl.h> 62 #include <sys/wait.h> 63 64 #include <err.h> 65 #include <fcntl.h> 66 #include <stdbool.h> 67 #include <stdio.h> 68 #include <stdlib.h> 69 #include <string.h> 70 #include <unistd.h> 71 72 #include "extern.h" 73 int pflags; 74 75 static void killed(int); 76 static void usage(void) __dead2; 77 78 static pid_t pid; 79 static bool kflag = false; 80 81 SET_DECLARE(dumpset, struct dumpers); 82 83 static int 84 open_corefile(char *corefile) 85 { 86 char fname[MAXPATHLEN]; 87 int fd; 88 89 if (corefile == NULL) { 90 (void)snprintf(fname, sizeof(fname), "core.%d", pid); 91 corefile = fname; 92 } 93 fd = open(corefile, O_RDWR | O_CREAT | O_TRUNC, DEFFILEMODE); 94 if (fd < 0) 95 err(1, "%s", corefile); 96 return (fd); 97 } 98 99 static void 100 kcoredump(int fd, pid_t pid) 101 { 102 struct ptrace_coredump pc; 103 int error, res, ret, waited; 104 105 error = ptrace(PT_ATTACH, pid, NULL, 0); 106 if (error != 0) 107 err(1, "attach"); 108 109 waited = waitpid(pid, &res, 0); 110 if (waited == -1) 111 err(1, "wait for STOP"); 112 113 ret = 0; 114 memset(&pc, 0, sizeof(pc)); 115 pc.pc_fd = fd; 116 pc.pc_flags = (pflags & PFLAGS_FULL) != 0 ? PC_ALL : 0; 117 error = ptrace(PT_COREDUMP, pid, (void *)&pc, sizeof(pc)); 118 if (error == -1) { 119 warn("coredump"); 120 ret = 1; 121 } 122 123 waited = waitpid(pid, &res, WNOHANG); 124 if (waited == -1) { 125 warn("wait after coredump"); 126 ret = 1; 127 } 128 129 error = ptrace(PT_DETACH, pid, NULL, 0); 130 if (error == -1) { 131 warn("detach failed, check process status"); 132 ret = 1; 133 } 134 135 exit(ret); 136 } 137 138 int 139 main(int argc, char *argv[]) 140 { 141 int ch, efd, fd, name[4]; 142 char *binfile, *corefile; 143 char passpath[MAXPATHLEN]; 144 struct dumpers **d, *dumper; 145 size_t len; 146 147 pflags = 0; 148 corefile = NULL; 149 while ((ch = getopt(argc, argv, "c:fk")) != -1) { 150 switch (ch) { 151 case 'c': 152 corefile = optarg; 153 break; 154 case 'f': 155 pflags |= PFLAGS_FULL; 156 break; 157 case 'k': 158 kflag = true; 159 break; 160 default: 161 usage(); 162 break; 163 } 164 } 165 argv += optind; 166 argc -= optind; 167 168 /* XXX we should check that the pid argument is really a number */ 169 switch (argc) { 170 case 1: 171 pid = atoi(argv[0]); 172 break; 173 case 2: 174 binfile = argv[0]; 175 pid = atoi(argv[1]); 176 break; 177 default: 178 usage(); 179 } 180 181 if (kflag) { 182 fd = open_corefile(corefile); 183 kcoredump(fd, pid); 184 } 185 186 if (argc == 1) { 187 name[0] = CTL_KERN; 188 name[1] = KERN_PROC; 189 name[2] = KERN_PROC_PATHNAME; 190 name[3] = pid; 191 len = sizeof(passpath); 192 if (sysctl(name, 4, passpath, &len, NULL, 0) == -1) 193 errx(1, "kern.proc.pathname failure"); 194 binfile = passpath; 195 } 196 efd = open(binfile, O_RDONLY, 0); 197 if (efd < 0) 198 err(1, "%s", binfile); 199 dumper = NULL; 200 SET_FOREACH(d, dumpset) { 201 lseek(efd, 0, SEEK_SET); 202 if (((*d)->ident)(efd, pid, binfile)) { 203 dumper = (*d); 204 lseek(efd, 0, SEEK_SET); 205 break; 206 } 207 } 208 if (dumper == NULL) 209 errx(1, "Invalid executable file"); 210 fd = open_corefile(corefile); 211 212 dumper->dump(efd, fd, pid); 213 (void)close(fd); 214 (void)close(efd); 215 exit(0); 216 } 217 218 void 219 usage(void) 220 { 221 222 (void)fprintf(stderr, 223 "usage: gcore [-kf] [-c core] [executable] pid\n"); 224 exit(1); 225 } 226