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 <stdio.h> 69 #include <stdlib.h> 70 #include <string.h> 71 #include <unistd.h> 72 73 #include "extern.h" 74 int sflag; 75 76 static void killed(int); 77 static void usage(void) __dead2; 78 79 static pid_t pid; 80 81 SET_DECLARE(dumpset, struct dumpers); 82 83 int 84 main(int argc, char *argv[]) 85 { 86 int ch, efd, fd, name[4]; 87 char *binfile, *corefile; 88 char passpath[MAXPATHLEN], fname[MAXPATHLEN]; 89 struct dumpers **d, *dumper; 90 size_t len; 91 92 sflag = 0; 93 corefile = NULL; 94 while ((ch = getopt(argc, argv, "c:s")) != -1) { 95 switch (ch) { 96 case 'c': 97 corefile = optarg; 98 break; 99 case 's': 100 sflag = 1; 101 break; 102 default: 103 usage(); 104 break; 105 } 106 } 107 argv += optind; 108 argc -= optind; 109 /* XXX we should check that the pid argument is really a number */ 110 switch (argc) { 111 case 1: 112 pid = atoi(argv[0]); 113 name[0] = CTL_KERN; 114 name[1] = KERN_PROC; 115 name[2] = KERN_PROC_PATHNAME; 116 name[3] = pid; 117 len = sizeof(passpath); 118 if (sysctl(name, 4, passpath, &len, NULL, 0) == -1) 119 errx(1, "kern.proc.pathname failure"); 120 binfile = passpath; 121 break; 122 case 2: 123 pid = atoi(argv[1]); 124 binfile = argv[0]; 125 break; 126 default: 127 usage(); 128 } 129 efd = open(binfile, O_RDONLY, 0); 130 if (efd < 0) 131 err(1, "%s", binfile); 132 dumper = NULL; 133 SET_FOREACH(d, dumpset) { 134 lseek(efd, 0, SEEK_SET); 135 if (((*d)->ident)(efd, pid, binfile)) { 136 dumper = (*d); 137 lseek(efd, 0, SEEK_SET); 138 break; 139 } 140 } 141 if (dumper == NULL) 142 errx(1, "Invalid executable file"); 143 if (corefile == NULL) { 144 (void)snprintf(fname, sizeof(fname), "core.%d", pid); 145 corefile = fname; 146 } 147 fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE); 148 if (fd < 0) 149 err(1, "%s", corefile); 150 /* 151 * The semantics of the 's' flag is to stop the target process. 152 * Previous versions of gcore would manage this by trapping SIGHUP, 153 * SIGINT and SIGTERM (to be passed to the target pid), and then 154 * signal the child to stop. 155 * 156 * However, this messes up if the selected dumper uses ptrace calls 157 * that leave the child already stopped. The waitpid call in elfcore 158 * never returns. 159 * 160 * The best thing to do here is to externalize the 's' flag and let 161 * each dumper dispose of what that means, if anything. For the elfcore 162 * dumper, the 's' flag is a no-op since the ptrace attach stops the 163 * process in question already. 164 */ 165 166 dumper->dump(efd, fd, pid); 167 (void)close(fd); 168 (void)close(efd); 169 exit(0); 170 } 171 172 void 173 usage(void) 174 { 175 176 (void)fprintf(stderr, "usage: gcore [-s] [-c core] [executable] pid\n"); 177 exit(1); 178 } 179