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