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 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 #ifndef lint 41 static char sccsid[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93"; 42 #endif /* not lint */ 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 #include <sys/param.h> 56 #include <sys/time.h> 57 #include <sys/stat.h> 58 #include <sys/proc.h> 59 #include <sys/user.h> 60 #include <sys/sysctl.h> 61 62 #include <machine/vmparam.h> 63 64 #include <a.out.h> 65 #include <fcntl.h> 66 #include <kvm.h> 67 #include <limits.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 void core __P((int, int, struct kinfo_proc *)); 77 void datadump __P((int, int, struct proc *, u_long, int)); 78 void usage __P((void)); 79 void userdump __P((int, struct proc *, u_long, int)); 80 81 kvm_t *kd; 82 /* XXX undocumented routine, should be in kvm.h? */ 83 ssize_t kvm_uread __P((kvm_t *, const struct proc *, u_long, char *, size_t)); 84 85 86 static int data_offset; 87 88 int 89 main(argc, argv) 90 int argc; 91 char *argv[]; 92 { 93 register struct proc *p; 94 struct kinfo_proc *ki; 95 struct exec exec; 96 int ch, cnt, efd, fd, pid, sflag, uid; 97 char *corefile, errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN + 1]; 98 99 sflag = 0; 100 corefile = NULL; 101 while ((ch = getopt(argc, argv, "c:s")) != EOF) { 102 switch (ch) { 103 case 'c': 104 corefile = optarg; 105 break; 106 case 's': 107 sflag = 1; 108 break; 109 default: 110 usage(); 111 break; 112 } 113 } 114 argv += optind; 115 argc -= optind; 116 117 if (argc != 2) 118 usage(); 119 120 kd = kvm_openfiles(0, 0, 0, O_RDONLY, errbuf); 121 if (kd == NULL) 122 err(1, "%s", errbuf); 123 124 uid = getuid(); 125 pid = atoi(argv[1]); 126 127 ki = kvm_getprocs(kd, KERN_PROC_PID, pid, &cnt); 128 if (ki == NULL || cnt != 1) 129 err(1, "%d: not found", pid); 130 131 p = &ki->kp_proc; 132 if (ki->kp_eproc.e_pcred.p_ruid != uid && uid != 0) 133 err(1, "%d: not owner", pid); 134 135 if (p->p_stat == SZOMB) 136 err(1, "%d: zombie", pid); 137 138 if (p->p_flag & P_WEXIT) 139 err(0, "process exiting"); 140 if (p->p_flag & P_SYSTEM) /* Swapper or pagedaemon. */ 141 err(1, "%d: system process"); 142 143 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: %s\n", corefile, strerror(errno)); 150 151 efd = open(argv[0], O_RDONLY, 0); 152 if (efd < 0) 153 err(1, "%s: %s\n", argv[0], strerror(errno)); 154 155 cnt = read(efd, &exec, sizeof(exec)); 156 if (cnt != sizeof(exec)) 157 err(1, "%s exec header: %s", 158 argv[0], cnt > 0 ? strerror(EIO) : strerror(errno)); 159 160 data_offset = N_DATOFF(exec); 161 162 if (sflag && kill(pid, SIGSTOP) < 0) 163 err(0, "%d: stop signal: %s", pid, strerror(errno)); 164 165 core(efd, fd, ki); 166 167 if (sflag && kill(pid, SIGCONT) < 0) 168 err(0, "%d: continue signal: %s", pid, strerror(errno)); 169 (void)close(fd); 170 171 exit(0); 172 } 173 174 /* 175 * core -- 176 * Build the core file. 177 */ 178 void 179 core(efd, fd, ki) 180 int efd; 181 int fd; 182 struct kinfo_proc *ki; 183 { 184 union { 185 struct user user; 186 char ubytes[ctob(UPAGES)]; 187 } uarea; 188 struct proc *p = &ki->kp_proc; 189 int tsize = ki->kp_eproc.e_vm.vm_tsize; 190 int dsize = ki->kp_eproc.e_vm.vm_dsize; 191 int ssize = ki->kp_eproc.e_vm.vm_ssize; 192 int cnt; 193 194 /* Read in user struct */ 195 cnt = kvm_read(kd, (u_long)p->p_addr, &uarea, sizeof(uarea)); 196 if (cnt != sizeof(uarea)) 197 err(1, "read user structure: %s", 198 cnt > 0 ? strerror(EIO) : strerror(errno)); 199 200 /* 201 * Fill in the eproc vm parameters, since these are garbage unless 202 * the kernel is dumping core or something. 203 */ 204 uarea.user.u_kproc = *ki; 205 206 /* Dump user area */ 207 cnt = write(fd, &uarea, sizeof(uarea)); 208 if (cnt != sizeof(uarea)) 209 err(1, "write user structure: %s", 210 cnt > 0 ? strerror(EIO) : strerror(errno)); 211 212 /* Dump data segment */ 213 datadump(efd, fd, p, USRTEXT + ctob(tsize), dsize); 214 215 /* Dump stack segment */ 216 userdump(fd, p, USRSTACK - ctob(ssize), ssize); 217 218 /* Dump machine dependent portions of the core. */ 219 md_core(kd, fd, ki); 220 } 221 222 void 223 datadump(efd, fd, p, addr, npage) 224 register int efd; 225 register int fd; 226 struct proc *p; 227 register u_long addr; 228 register int npage; 229 { 230 register int cc, delta; 231 char buffer[PAGE_SIZE]; 232 233 delta = data_offset - addr; 234 while (--npage >= 0) { 235 cc = kvm_uread(kd, p, addr, buffer, PAGE_SIZE); 236 if (cc != PAGE_SIZE) { 237 /* Try to read the page from the executable. */ 238 if (lseek(efd, (off_t)addr + delta, SEEK_SET) == -1) 239 err(1, "seek executable: %s", strerror(errno)); 240 cc = read(efd, buffer, sizeof(buffer)); 241 if (cc != sizeof(buffer)) 242 if (cc < 0) 243 err(1, "read executable: %s", 244 strerror(errno)); 245 else /* Assume untouched bss page. */ 246 bzero(buffer, sizeof(buffer)); 247 } 248 cc = write(fd, buffer, PAGE_SIZE); 249 if (cc != PAGE_SIZE) 250 err(1, "write data segment: %s", 251 cc > 0 ? strerror(EIO) : strerror(errno)); 252 addr += PAGE_SIZE; 253 } 254 } 255 256 void 257 userdump(fd, p, addr, npage) 258 register int fd; 259 struct proc *p; 260 register u_long addr; 261 register int npage; 262 { 263 register int cc; 264 char buffer[PAGE_SIZE]; 265 266 while (--npage >= 0) { 267 cc = kvm_uread(kd, p, addr, buffer, PAGE_SIZE); 268 if (cc != PAGE_SIZE) 269 /* Could be an untouched fill-with-zero page. */ 270 bzero(buffer, PAGE_SIZE); 271 cc = write(fd, buffer, PAGE_SIZE); 272 if (cc != PAGE_SIZE) 273 err(1, "write stack segment: %s", 274 cc > 0 ? strerror(EIO) : strerror(errno)); 275 addr += PAGE_SIZE; 276 } 277 } 278 279 void 280 usage() 281 { 282 (void)fprintf(stderr, "usage: gcore [-s] [-c core] executable pid\n"); 283 exit(1); 284 } 285 286 #if __STDC__ 287 #include <stdarg.h> 288 #else 289 #include <varargs.h> 290 #endif 291 292 void 293 #if __STDC__ 294 err(int fatal, const char *fmt, ...) 295 #else 296 err(fatal, fmt, va_alist) 297 int fatal; 298 char *fmt; 299 va_dcl 300 #endif 301 { 302 va_list ap; 303 #if __STDC__ 304 va_start(ap, fmt); 305 #else 306 va_start(ap); 307 #endif 308 (void)fprintf(stderr, "gcore: "); 309 (void)vfprintf(stderr, fmt, ap); 310 va_end(ap); 311 (void)fprintf(stderr, "\n"); 312 exit(1); 313 /* NOTREACHED */ 314 } 315