gcore.c revision 1.2
1 /* $NetBSD: gcore.c,v 1.2 1995/09/05 02:51:00 tls Exp $ */ 2 3 /*- 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 static char copyright[] = 38 "@(#) Copyright (c) 1992, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93"; 45 #else 46 static char rcsid[] = "$NetBSD: gcore.c,v 1.2 1995/09/05 02:51:00 tls Exp $"; 47 #endif 48 #endif /* not lint */ 49 50 /* 51 * Originally written by Eric Cooper in Fall 1981. 52 * Inspired by a version 6 program by Len Levin, 1978. 53 * Several pieces of code lifted from Bill Joy's 4BSD ps. 54 * Most recently, hacked beyond recognition for 4.4BSD by Steven McCanne, 55 * Lawrence Berkeley Laboratory. 56 * 57 * Portions of this software were developed by the Computer Systems 58 * Engineering group at Lawrence Berkeley Laboratory under DARPA 59 * contract BG 91-66 and contributed to Berkeley. 60 */ 61 #include <sys/param.h> 62 #include <sys/time.h> 63 #include <sys/stat.h> 64 #include <sys/proc.h> 65 #include <sys/user.h> 66 #include <sys/sysctl.h> 67 68 #include <machine/vmparam.h> 69 70 #include <a.out.h> 71 #include <fcntl.h> 72 #include <kvm.h> 73 #include <limits.h> 74 #include <signal.h> 75 #include <stdio.h> 76 #include <stdlib.h> 77 #include <string.h> 78 #include <unistd.h> 79 80 #include "extern.h" 81 82 void core __P((int, int, struct kinfo_proc *)); 83 void datadump __P((int, int, struct proc *, u_long, int)); 84 void usage __P((void)); 85 void userdump __P((int, struct proc *, u_long, int)); 86 87 kvm_t *kd; 88 /* XXX undocumented routine, should be in kvm.h? */ 89 ssize_t kvm_uread __P((kvm_t *, struct proc *, u_long, char *, size_t)); 90 91 static int data_offset; 92 93 int 94 main(argc, argv) 95 int argc; 96 char *argv[]; 97 { 98 register struct proc *p; 99 struct kinfo_proc *ki; 100 struct exec exec; 101 int ch, cnt, efd, fd, pid, sflag, uid; 102 char *corefile, errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN + 1]; 103 104 sflag = 0; 105 corefile = NULL; 106 while ((ch = getopt(argc, argv, "c:s")) != EOF) { 107 switch (ch) { 108 case 'c': 109 corefile = optarg; 110 break; 111 case 's': 112 sflag = 1; 113 break; 114 default: 115 usage(); 116 break; 117 } 118 } 119 argv += optind; 120 argc -= optind; 121 122 if (argc != 2) 123 usage(); 124 125 kd = kvm_openfiles(0, 0, 0, O_RDONLY, errbuf); 126 if (kd == NULL) 127 err(1, "%s", errbuf); 128 129 uid = getuid(); 130 pid = atoi(argv[1]); 131 132 ki = kvm_getprocs(kd, KERN_PROC_PID, pid, &cnt); 133 if (ki == NULL || cnt != 1) 134 err(1, "%d: not found", pid); 135 136 p = &ki->kp_proc; 137 if (ki->kp_eproc.e_pcred.p_ruid != uid && uid != 0) 138 err(1, "%d: not owner", pid); 139 140 if (p->p_stat == SZOMB) 141 err(1, "%d: zombie", pid); 142 143 if (p->p_flag & P_WEXIT) 144 err(0, "process exiting"); 145 if (p->p_flag & P_SYSTEM) /* Swapper or pagedaemon. */ 146 err(1, "%d: system process"); 147 148 if (corefile == NULL) { 149 (void)snprintf(fname, sizeof(fname), "core.%d", pid); 150 corefile = fname; 151 } 152 fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE); 153 if (fd < 0) 154 err(1, "%s: %s\n", corefile, strerror(errno)); 155 156 efd = open(argv[0], O_RDONLY, 0); 157 if (efd < 0) 158 err(1, "%s: %s\n", argv[0], strerror(errno)); 159 160 cnt = read(efd, &exec, sizeof(exec)); 161 if (cnt != sizeof(exec)) 162 err(1, "%s exec header: %s", 163 argv[0], cnt > 0 ? strerror(EIO) : strerror(errno)); 164 165 data_offset = N_DATOFF(exec); 166 167 if (sflag && kill(pid, SIGSTOP) < 0) 168 err(0, "%d: stop signal: %s", pid, strerror(errno)); 169 170 core(efd, fd, ki); 171 172 if (sflag && kill(pid, SIGCONT) < 0) 173 err(0, "%d: continue signal: %s", pid, strerror(errno)); 174 (void)close(fd); 175 176 exit(0); 177 } 178 179 /* 180 * core -- 181 * Build the core file. 182 */ 183 void 184 core(efd, fd, ki) 185 int efd; 186 int fd; 187 struct kinfo_proc *ki; 188 { 189 union { 190 struct user user; 191 char ubytes[ctob(UPAGES)]; 192 } uarea; 193 struct proc *p = &ki->kp_proc; 194 int tsize = ki->kp_eproc.e_vm.vm_tsize; 195 int dsize = ki->kp_eproc.e_vm.vm_dsize; 196 int ssize = ki->kp_eproc.e_vm.vm_ssize; 197 int cnt; 198 199 /* Read in user struct */ 200 cnt = kvm_read(kd, (u_long)p->p_addr, &uarea, sizeof(uarea)); 201 if (cnt != sizeof(uarea)) 202 err(1, "read user structure: %s", 203 cnt > 0 ? strerror(EIO) : strerror(errno)); 204 205 /* 206 * Fill in the eproc vm parameters, since these are garbage unless 207 * the kernel is dumping core or something. 208 */ 209 uarea.user.u_kproc = *ki; 210 211 /* Dump user area */ 212 cnt = write(fd, &uarea, sizeof(uarea)); 213 if (cnt != sizeof(uarea)) 214 err(1, "write user structure: %s", 215 cnt > 0 ? strerror(EIO) : strerror(errno)); 216 217 /* Dump data segment */ 218 datadump(efd, fd, p, USRTEXT + ctob(tsize), dsize); 219 220 /* Dump stack segment */ 221 userdump(fd, p, USRSTACK - ctob(ssize), ssize); 222 223 /* Dump machine dependent portions of the core. */ 224 md_core(kd, fd, ki); 225 } 226 227 void 228 datadump(efd, fd, p, addr, npage) 229 register int efd; 230 register int fd; 231 struct proc *p; 232 register u_long addr; 233 register int npage; 234 { 235 register int cc, delta; 236 char buffer[NBPG]; 237 238 delta = data_offset - addr; 239 while (--npage >= 0) { 240 cc = kvm_uread(kd, p, addr, buffer, NBPG); 241 if (cc != NBPG) { 242 /* Try to read the page from the executable. */ 243 if (lseek(efd, (off_t)addr + delta, SEEK_SET) == -1) 244 err(1, "seek executable: %s", strerror(errno)); 245 cc = read(efd, buffer, sizeof(buffer)); 246 if (cc != sizeof(buffer)) 247 if (cc < 0) 248 err(1, "read executable: %s", 249 strerror(errno)); 250 else /* Assume untouched bss page. */ 251 bzero(buffer, sizeof(buffer)); 252 } 253 cc = write(fd, buffer, NBPG); 254 if (cc != NBPG) 255 err(1, "write data segment: %s", 256 cc > 0 ? strerror(EIO) : strerror(errno)); 257 addr += NBPG; 258 } 259 } 260 261 void 262 userdump(fd, p, addr, npage) 263 register int fd; 264 struct proc *p; 265 register u_long addr; 266 register int npage; 267 { 268 register int cc; 269 char buffer[NBPG]; 270 271 while (--npage >= 0) { 272 cc = kvm_uread(kd, p, addr, buffer, NBPG); 273 if (cc != NBPG) 274 /* Could be an untouched fill-with-zero page. */ 275 bzero(buffer, NBPG); 276 cc = write(fd, buffer, NBPG); 277 if (cc != NBPG) 278 err(1, "write stack segment: %s", 279 cc > 0 ? strerror(EIO) : strerror(errno)); 280 addr += NBPG; 281 } 282 } 283 284 void 285 usage() 286 { 287 (void)fprintf(stderr, "usage: gcore [-s] [-c core] executable pid\n"); 288 exit(1); 289 } 290 291 #if __STDC__ 292 #include <stdarg.h> 293 #else 294 #include <varargs.h> 295 #endif 296 297 void 298 #if __STDC__ 299 err(int fatal, const char *fmt, ...) 300 #else 301 err(fatal, fmt, va_alist) 302 int fatal; 303 char *fmt; 304 va_dcl 305 #endif 306 { 307 va_list ap; 308 #if __STDC__ 309 va_start(ap, fmt); 310 #else 311 va_start(ap); 312 #endif 313 (void)fprintf(stderr, "gcore: "); 314 (void)vfprintf(stderr, fmt, ap); 315 va_end(ap); 316 (void)fprintf(stderr, "\n"); 317 exit(1); 318 /* NOTREACHED */ 319 } 320
Indexes created Tue Sep 23 07:09:52 GMT 2025