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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1992, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)gcore.c 8.2 (Berkeley) 9/23/93 35 * $FreeBSD: src/usr.bin/gcore/gcore.c,v 1.15.2.2 2001/08/17 20:56:22 mikeh Exp $ 36 * $DragonFly: src/usr.bin/gcore/gcore.c,v 1.11 2007/02/25 23:07:08 corecode Exp $ 37 */ 38 39 /* 40 * Originally written by Eric Cooper in Fall 1981. 41 * Inspired by a version 6 program by Len Levin, 1978. 42 * Several pieces of code lifted from Bill Joy's 4BSD ps. 43 * Most recently, hacked beyond recognition for 4.4BSD by Steven McCanne, 44 * Lawrence Berkeley Laboratory. 45 * 46 * Portions of this software were developed by the Computer Systems 47 * Engineering group at Lawrence Berkeley Laboratory under DARPA 48 * contract BG 91-66 and contributed to Berkeley. 49 */ 50 #include <sys/param.h> 51 #include <sys/time.h> 52 #include <sys/stat.h> 53 #include <sys/user.h> 54 #include <sys/sysctl.h> 55 #include <machine/elf.h> 56 57 #include <machine/vmparam.h> 58 59 #include <a.out.h> 60 #include <err.h> 61 #include <fcntl.h> 62 #include <kvm.h> 63 #include <limits.h> 64 #include <signal.h> 65 #include <stdio.h> 66 #include <stdlib.h> 67 #include <string.h> 68 #include <unistd.h> 69 70 #include "extern.h" 71 72 static void killed(int); 73 static void restart_target(void); 74 static void usage(void) __dead2; 75 76 kvm_t *kd; 77 78 static pid_t pid; 79 80 int 81 main(int argc, char **argv) 82 { 83 struct exec exec; 84 int ch, cnt, efd, fd, sflag; 85 char *binfile, *corefile; 86 char fname[MAXPATHLEN + 1]; 87 88 sflag = 0; 89 corefile = NULL; 90 while ((ch = getopt(argc, argv, "c:s")) != -1) { 91 switch (ch) { 92 case 'c': 93 corefile = optarg; 94 break; 95 case 's': 96 sflag = 1; 97 break; 98 default: 99 usage(); 100 break; 101 } 102 } 103 argv += optind; 104 argc -= optind; 105 106 /* XXX we should check that the pid argument is really a number */ 107 switch (argc) { 108 case 1: 109 pid = atoi(argv[0]); 110 asprintf(&binfile, "/proc/%d/file", pid); 111 if (binfile == NULL) 112 errx(1, "allocation failure"); 113 break; 114 case 2: 115 pid = atoi(argv[1]); 116 binfile = argv[0]; 117 break; 118 default: 119 usage(); 120 } 121 122 efd = open(binfile, O_RDONLY, 0); 123 if (efd < 0) 124 err(1, "%s", binfile); 125 126 cnt = read(efd, &exec, sizeof(exec)); 127 if (cnt != sizeof(exec)) 128 errx(1, "%s exec header: %s", 129 binfile, cnt > 0 ? strerror(EIO) : strerror(errno)); 130 if (IS_ELF(*(Elf_Ehdr *)&exec)) { 131 close(efd); 132 } else 133 errx(1, "Invalid executable file"); 134 135 if (corefile == NULL) { 136 (void)snprintf(fname, sizeof(fname), "core.%d", pid); 137 corefile = fname; 138 } 139 fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE); 140 if (fd < 0) 141 err(1, "%s", corefile); 142 143 if (sflag) { 144 signal(SIGHUP, killed); 145 signal(SIGINT, killed); 146 signal(SIGTERM, killed); 147 if (kill(pid, SIGSTOP) == -1) 148 err(1, "%d: stop signal", pid); 149 atexit(restart_target); 150 } 151 152 elf_coredump(fd, pid); 153 154 (void)close(fd); 155 exit(0); 156 } 157 158 static void 159 killed(int sig) 160 { 161 restart_target(); 162 signal(sig, SIG_DFL); 163 kill(getpid(), sig); 164 } 165 166 static void 167 restart_target(void) 168 { 169 kill(pid, SIGCONT); 170 } 171 172 void 173 usage(void) 174 { 175 (void)fprintf(stderr, "usage: gcore [-s] [-c core] [executable] pid\n"); 176 exit(1); 177 } 178