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 * 4. 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 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1992, 1993\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #if 0 37 #ifndef lint 38 static char sccsid[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93"; 39 #endif /* not lint */ 40 #endif 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 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/time.h> 58 #include <sys/stat.h> 59 #include <sys/linker_set.h> 60 #include <sys/sysctl.h> 61 62 #include <err.h> 63 #include <fcntl.h> 64 #include <stdio.h> 65 #include <stdlib.h> 66 #include <string.h> 67 #include <unistd.h> 68 69 #include "extern.h" 70 int pflags; 71 72 static void killed(int); 73 static void usage(void) __dead2; 74 75 static pid_t pid; 76 77 SET_DECLARE(dumpset, struct dumpers); 78 79 int 80 main(int argc, char *argv[]) 81 { 82 int ch, efd, fd, name[4]; 83 char *binfile, *corefile; 84 char passpath[MAXPATHLEN], fname[MAXPATHLEN]; 85 struct dumpers **d, *dumper; 86 size_t len; 87 88 pflags = 0; 89 corefile = NULL; 90 while ((ch = getopt(argc, argv, "c:fs")) != -1) { 91 switch (ch) { 92 case 'c': 93 corefile = optarg; 94 break; 95 case 'f': 96 pflags |= PFLAGS_FULL; 97 break; 98 case 's': 99 pflags |= PFLAGS_RESUME; 100 break; 101 default: 102 usage(); 103 break; 104 } 105 } 106 argv += optind; 107 argc -= optind; 108 /* XXX we should check that the pid argument is really a number */ 109 switch (argc) { 110 case 1: 111 pid = atoi(argv[0]); 112 name[0] = CTL_KERN; 113 name[1] = KERN_PROC; 114 name[2] = KERN_PROC_PATHNAME; 115 name[3] = pid; 116 len = sizeof(passpath); 117 if (sysctl(name, 4, passpath, &len, NULL, 0) == -1) 118 errx(1, "kern.proc.pathname failure"); 119 binfile = passpath; 120 break; 121 case 2: 122 pid = atoi(argv[1]); 123 binfile = argv[0]; 124 break; 125 default: 126 usage(); 127 } 128 efd = open(binfile, O_RDONLY, 0); 129 if (efd < 0) 130 err(1, "%s", binfile); 131 dumper = NULL; 132 SET_FOREACH(d, dumpset) { 133 lseek(efd, 0, SEEK_SET); 134 if (((*d)->ident)(efd, pid, binfile)) { 135 dumper = (*d); 136 lseek(efd, 0, SEEK_SET); 137 break; 138 } 139 } 140 if (dumper == NULL) 141 errx(1, "Invalid executable file"); 142 if (corefile == NULL) { 143 (void)snprintf(fname, sizeof(fname), "core.%d", pid); 144 corefile = fname; 145 } 146 fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE); 147 if (fd < 0) 148 err(1, "%s", corefile); 149 /* 150 * The semantics of the 's' flag is to stop the target process. 151 * Previous versions of gcore would manage this by trapping SIGHUP, 152 * SIGINT and SIGTERM (to be passed to the target pid), and then 153 * signal the child to stop. 154 * 155 * However, this messes up if the selected dumper uses ptrace calls 156 * that leave the child already stopped. The waitpid call in elfcore 157 * never returns. 158 * 159 * The best thing to do here is to externalize the 's' flag and let 160 * each dumper dispose of what that means, if anything. For the elfcore 161 * dumper, the 's' flag is a no-op since the ptrace attach stops the 162 * process in question already. 163 */ 164 165 dumper->dump(efd, fd, pid); 166 (void)close(fd); 167 (void)close(efd); 168 exit(0); 169 } 170 171 void 172 usage(void) 173 { 174 175 (void)fprintf(stderr, "usage: gcore [-s] [-c core] [executable] pid\n"); 176 exit(1); 177 } 178