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 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1992, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #if 0 41 #ifndef lint 42 static char sccsid[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93"; 43 #endif /* not lint */ 44 #endif 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 /* 49 * Originally written by Eric Cooper in Fall 1981. 50 * Inspired by a version 6 program by Len Levin, 1978. 51 * Several pieces of code lifted from Bill Joy's 4BSD ps. 52 * Most recently, hacked beyond recognition for 4.4BSD by Steven McCanne, 53 * Lawrence Berkeley Laboratory. 54 * 55 * Portions of this software were developed by the Computer Systems 56 * Engineering group at Lawrence Berkeley Laboratory under DARPA 57 * contract BG 91-66 and contributed to Berkeley. 58 */ 59 60 #include <sys/param.h> 61 #include <sys/time.h> 62 #include <sys/stat.h> 63 #include <sys/linker_set.h> 64 #include <sys/sysctl.h> 65 66 #include <err.h> 67 #include <fcntl.h> 68 #include <signal.h> 69 #include <stdio.h> 70 #include <stdlib.h> 71 #include <string.h> 72 #include <unistd.h> 73 74 #include "extern.h" 75 76 static void killed(int); 77 static void restart_target(void); 78 static void usage(void) __dead2; 79 80 static pid_t pid; 81 82 SET_DECLARE(dumpset, struct dumpers); 83 84 int 85 main(int argc, char *argv[]) 86 { 87 int ch, efd, fd, name[4], sflag; 88 char *binfile, *corefile; 89 char passpath[MAXPATHLEN], fname[MAXPATHLEN]; 90 struct dumpers **d, *dumper; 91 size_t len; 92 93 sflag = 0; 94 corefile = NULL; 95 while ((ch = getopt(argc, argv, "c:s")) != -1) { 96 switch (ch) { 97 case 'c': 98 corefile = optarg; 99 break; 100 case 's': 101 sflag = 1; 102 break; 103 default: 104 usage(); 105 break; 106 } 107 } 108 argv += optind; 109 argc -= optind; 110 /* XXX we should check that the pid argument is really a number */ 111 switch (argc) { 112 case 1: 113 pid = atoi(argv[0]); 114 name[0] = CTL_KERN; 115 name[1] = KERN_PROC; 116 name[2] = KERN_PROC_PATHNAME; 117 name[3] = pid; 118 len = sizeof(passpath); 119 if (sysctl(name, 4, passpath, &len, NULL, 0) == -1) 120 errx(1, "kern.proc.pathname failure"); 121 binfile = passpath; 122 break; 123 case 2: 124 pid = atoi(argv[1]); 125 binfile = argv[0]; 126 break; 127 default: 128 usage(); 129 } 130 efd = open(binfile, O_RDONLY, 0); 131 if (efd < 0) 132 err(1, "%s", binfile); 133 dumper = NULL; 134 SET_FOREACH(d, dumpset) { 135 lseek(efd, 0, SEEK_SET); 136 if (((*d)->ident)(efd, pid, binfile)) { 137 dumper = (*d); 138 lseek(efd, 0, SEEK_SET); 139 break; 140 } 141 } 142 if (dumper == NULL) 143 errx(1, "Invalid executable file"); 144 if (corefile == NULL) { 145 (void)snprintf(fname, sizeof(fname), "core.%d", pid); 146 corefile = fname; 147 } 148 fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE); 149 if (fd < 0) 150 err(1, "%s", corefile); 151 if (sflag) { 152 signal(SIGHUP, killed); 153 signal(SIGINT, killed); 154 signal(SIGTERM, killed); 155 if (kill(pid, SIGSTOP) == -1) 156 err(1, "%d: stop signal", pid); 157 atexit(restart_target); 158 } 159 dumper->dump(efd, fd, pid); 160 (void)close(fd); 161 (void)close(efd); 162 exit(0); 163 } 164 165 static void 166 killed(int sig) 167 { 168 169 restart_target(); 170 signal(sig, SIG_DFL); 171 kill(getpid(), sig); 172 } 173 174 static void 175 restart_target(void) 176 { 177 178 kill(pid, SIGCONT); 179 } 180 181 void 182 usage(void) 183 { 184 185 (void)fprintf(stderr, "usage: gcore [-s] [-c core] [executable] pid\n"); 186 exit(1); 187 } 188