gcore.c revision 1.1
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 *, struct proc *, u_long, char *, size_t)); 84 85 static int data_offset; 86 87 int 88 main(argc, argv) 89 int argc; 90 char *argv[]; 91 { 92 register struct proc *p; 93 struct kinfo_proc *ki; 94 struct exec exec; 95 int ch, cnt, efd, fd, pid, sflag, uid; 96 char *corefile, errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN + 1]; 97 98 sflag = 0; 99 corefile = NULL; 100 while ((ch = getopt(argc, argv, "c:s")) != EOF) { 101 switch (ch) { 102 case 'c': 103 corefile = optarg; 104 break; 105 case 's': 106 sflag = 1; 107 break; 108 default: 109 usage(); 110 break; 111 } 112 } 113 argv += optind; 114 argc -= optind; 115 116 if (argc != 2) 117 usage(); 118 119 kd = kvm_openfiles(0, 0, 0, O_RDONLY, errbuf); 120 if (kd == NULL) 121 err(1, "%s", errbuf); 122 123 uid = getuid(); 124 pid = atoi(argv[1]); 125 126 ki = kvm_getprocs(kd, KERN_PROC_PID, pid, &cnt); 127 if (ki == NULL || cnt != 1) 128 err(1, "%d: not found", pid); 129 130 p = &ki->kp_proc; 131 if (ki->kp_eproc.e_pcred.p_ruid != uid && uid != 0) 132 err(1, "%d: not owner", pid); 133 134 if (p->p_stat == SZOMB) 135 err(1, "%d: zombie", pid); 136 137 if (p->p_flag & P_WEXIT) 138 err(0, "process exiting"); 139 if (p->p_flag & P_SYSTEM) /* Swapper or pagedaemon. */ 140 err(1, "%d: system process"); 141 142 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: %s\n", corefile, strerror(errno)); 149 150 efd = open(argv[0], O_RDONLY, 0); 151 if (efd < 0) 152 err(1, "%s: %s\n", argv[0], strerror(errno)); 153 154 cnt = read(efd, &exec, sizeof(exec)); 155 if (cnt != sizeof(exec)) 156 err(1, "%s exec header: %s", 157 argv[0], cnt > 0 ? strerror(EIO) : strerror(errno)); 158 159 data_offset = N_DATOFF(exec); 160 161 if (sflag && kill(pid, SIGSTOP) < 0) 162 err(0, "%d: stop signal: %s", pid, strerror(errno)); 163 164 core(efd, fd, ki); 165 166 if (sflag && kill(pid, SIGCONT) < 0) 167 err(0, "%d: continue signal: %s", pid, strerror(errno)); 168 (void)close(fd); 169 170 exit(0); 171 } 172 173 /* 174 * core -- 175 * Build the core file. 176 */ 177 void 178 core(efd, fd, ki) 179 int efd; 180 int fd; 181 struct kinfo_proc *ki; 182 { 183 union { 184 struct user user; 185 char ubytes[ctob(UPAGES)]; 186 } uarea; 187 struct proc *p = &ki->kp_proc; 188 int tsize = ki->kp_eproc.e_vm.vm_tsize; 189 int dsize = ki->kp_eproc.e_vm.vm_dsize; 190 int ssize = ki->kp_eproc.e_vm.vm_ssize; 191 int cnt; 192 193 /* Read in user struct */ 194 cnt = kvm_read(kd, (u_long)p->p_addr, &uarea, sizeof(uarea)); 195 if (cnt != sizeof(uarea)) 196 err(1, "read user structure: %s", 197 cnt > 0 ? strerror(EIO) : strerror(errno)); 198 199 /* 200 * Fill in the eproc vm parameters, since these are garbage unless 201 * the kernel is dumping core or something. 202 */ 203 uarea.user.u_kproc = *ki; 204 205 /* Dump user area */ 206 cnt = write(fd, &uarea, sizeof(uarea)); 207 if (cnt != sizeof(uarea)) 208 err(1, "write user structure: %s", 209 cnt > 0 ? strerror(EIO) : strerror(errno)); 210 211 /* Dump data segment */ 212 datadump(efd, fd, p, USRTEXT + ctob(tsize), dsize); 213 214 /* Dump stack segment */ 215 userdump(fd, p, USRSTACK - ctob(ssize), ssize); 216 217 /* Dump machine dependent portions of the core. */ 218 md_core(kd, fd, ki); 219 } 220 221 void 222 datadump(efd, fd, p, addr, npage) 223 register int efd; 224 register int fd; 225 struct proc *p; 226 register u_long addr; 227 register int npage; 228 { 229 register int cc, delta; 230 char buffer[NBPG]; 231 232 delta = data_offset - addr; 233 while (--npage >= 0) { 234 cc = kvm_uread(kd, p, addr, buffer, NBPG); 235 if (cc != NBPG) { 236 /* Try to read the page from the executable. */ 237 if (lseek(efd, (off_t)addr + delta, SEEK_SET) == -1) 238 err(1, "seek executable: %s", strerror(errno)); 239 cc = read(efd, buffer, sizeof(buffer)); 240 if (cc != sizeof(buffer)) 241 if (cc < 0) 242 err(1, "read executable: %s", 243 strerror(errno)); 244 else /* Assume untouched bss page. */ 245 bzero(buffer, sizeof(buffer)); 246 } 247 cc = write(fd, buffer, NBPG); 248 if (cc != NBPG) 249 err(1, "write data segment: %s", 250 cc > 0 ? strerror(EIO) : strerror(errno)); 251 addr += NBPG; 252 } 253 } 254 255 void 256 userdump(fd, p, addr, npage) 257 register int fd; 258 struct proc *p; 259 register u_long addr; 260 register int npage; 261 { 262 register int cc; 263 char buffer[NBPG]; 264 265 while (--npage >= 0) { 266 cc = kvm_uread(kd, p, addr, buffer, NBPG); 267 if (cc != NBPG) 268 /* Could be an untouched fill-with-zero page. */ 269 bzero(buffer, NBPG); 270 cc = write(fd, buffer, NBPG); 271 if (cc != NBPG) 272 err(1, "write stack segment: %s", 273 cc > 0 ? strerror(EIO) : strerror(errno)); 274 addr += NBPG; 275 } 276 } 277 278 void 279 usage() 280 { 281 (void)fprintf(stderr, "usage: gcore [-s] [-c core] executable pid\n"); 282 exit(1); 283 } 284 285 #if __STDC__ 286 #include <stdarg.h> 287 #else 288 #include <varargs.h> 289 #endif 290 291 void 292 #if __STDC__ 293 err(int fatal, const char *fmt, ...) 294 #else 295 err(fatal, fmt, va_alist) 296 int fatal; 297 char *fmt; 298 va_dcl 299 #endif 300 { 301 va_list ap; 302 #if __STDC__ 303 va_start(ap, fmt); 304 #else 305 va_start(ap); 306 #endif 307 (void)fprintf(stderr, "gcore: "); 308 (void)vfprintf(stderr, fmt, ap); 309 va_end(ap); 310 (void)fprintf(stderr, "\n"); 311 exit(1); 312 /* NOTREACHED */ 313 } 314
Indexes created Thu Sep 25 02:09:54 GMT 2025